Friedrich Kuhl R 410A Users Manual RAC Standard Chassis IO_(06 12 10)_CS3

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2015-02-02

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Service Manual

Standard Chassis R-410A Models

Room Air Conditioners

115-Volt:

208-230-Volt:

Cool Only

SS08M10, SS10M10, SS12M10, SS14M10

SS12M30, SS15M30, SM18M30, SM21M30

SM24M30, SL28M30, SL36M30

Cool with Electric Heat

208-230-Volt: ES12M33, ES15M33, EM18M34, EM24M35, EL36M35

Heat Pump with Electric Heat

208-230-Volt: YS12M33, YM18M34, YL24M35

Heat Pump

115-Volt: YS10M10

SYSTEM FAN MODE

SCHEDULE FAN SPEED

AUTO

CONTINUOUS

°F °C

Kuhl-ServMan (5-10)

Table Of Contents

Important Safety Information ..................................................................................................................................... 2-4

Introduction ................................................................................................................................................................... 5

Model and Serial Number Location .............................................................................................................................. 5

Unit Identiﬁ cation .......................................................................................................................................................... 6

Performance Data and Speciﬁ cations .......................................................................................................................... 7

Installation Information/Sleeve Dimensions/Circuit Rating ........................................................................................... 8

Electrical Data ............................................................................................................................................................... 9

Before Operating the Unit ............................................................................................................................................10

Control Panel Operation ..............................................................................................................................................11

Alerts ......................................................................................................................................................................12-14

Remote Control Operation ......................................................................................................................................15-16

Electronic Control System Maintenance Operation .................................................................................................17-20

Unit Operation .............................................................................................................................................................. 21

Cool-Heat Set Points .................................................................................................................................................. 22

Electronic Control Sequence of Operation ............................................................................................................ 23-29

Unit Operation with a Wall-Stat ................................................................................................................................... 29

Removing the Front Cover and Unit Chassis ................................................................................................................ 30

Replacing the ID Coil Thermistor ................................................................................................................................ 31

Replacing the Control Board ....................................................................................................................................... 31

Low Voltage Interface Connector ................................................................................................................................ 32

Replacing the ID Coil Thermistor ................................................................................................................................ 31

Remote Wall Thermostat ....................................................................................................................................... 32-33

Airﬂ ow Selection and Adjustment ............................................................................................................................... 33

Components Testing .............................................................................................................................................. 34-35

Refrigeration Sequence of Operation .................................................................................................................... 36-37

Sealed Refrigeration System Repairs ................................................................................................................... 38-41

Hermetics Components Check ................................................................................................................................... 42

Reversing Valve Description/Operation ...................................................................................................................... 43

Testing the Coil ........................................................................................................................................................... 44

Checking the Reversing Valve ............................................................................................................................... 44-45

Compressor Checks .............................................................................................................................................. 46-47

Compressor Replacement ..................................................................................................................................... 48-49

Routine Maintenance / Battery Check / Change ...................................................................................................... 50-53

Service and Assistance ............................................................................................................................................... 54

Performance Test Data Sheet and Sizing Guide .......................................................................................................... 55

Error Codes and Alarm Status .................................................................................................................................... 56

Troubleshooting ..................................................................................................................................................... 57-66

Electronic Control Board Components Identiﬁ cation ................................................................................................... 67

Wiring Diagrams .................................................................................................................................................... 68-75

Thermistors' Resistance Values .................................................................................................................................. 76

Remote Control Replacement Instructions ........................................................................................................... 77-78

User Interface Service Kit ........................................................................................................................................... 79

Instructions for Using Cooling Load Estimate Form ................................................................................................... 80

Cooling Load Estimate Form ...................................................................................................................................... 81

Heat Load Form .................................................................................................................................................... 82-83

Warranty ..................................................................................................................................................................... 84

IMPORTANT SAFETY INFORMATION

The information contained in this manual is intended for use by a qualiﬁ ed service technician who is familiar

with the safety procedures required for installation and repair, and who is equipped with the proper tools

and test instruments required to service this product.

Installation or repairs made by unqualiﬁ ed persons can result in subjecting the unqualiﬁ ed person making

such repairs as well as the persons being served by the equipment to hazards resulting in injury or

electrical shock which can be serious or even fatal.

Safety warnings have been placed throughout this manual to alert you to potential hazards that may be

encountered. If you install or perform service on equipment, it is your responsibility to read and obey these

warnings to guard against any bodily injury or property damage which may result to you or others.

PERSONAL INJURY OR DEATH HAZARDS

ELECTRICAL HAZARDS:

Unplug and/or disconnect all electrical power to the unit before performing inspections, •

maintenance, or service.

M• ake sure to follow proper lockout/tag out procedures.

A• lways work in the company of a qualiﬁ ed assistant if possible.

C• apacitors, even when disconnected from the electrical power source, retain an electrical charge

potential capable of causing electric shock or electrocution.

H• andle, discharge, and test capacitors according to safe, established, standards, and approved

procedures.

E• xtreme care, proper judgment, and safety procedures must be exercised if it becomes necessary

to test or troubleshoot equipment with the power on to the unit.

Your safety and the safety of others are very important.

We have provided many important safety messages in this manual and on your appliance. Always read

and obey all safety messages.

All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury,

and tell you what will happen if the instructions are not followed.

This is a Safety Alert symbol.

This symbol alerts you to potential hazards that can kill or hurt you and others.

All safety messages will follow the safety alert symbol with the word “WARNING”

or “CAUTION”. These words mean:

You can be killed or seriously injured if you do not follow instructions.

You can receive minor or moderate injury if you do not follow instructions.

A message to alert you of potential property damage will have the

word “NOTICE”. Potential property damage can occur if instructions

are not followed.

WARNING

CAUTION

NOTICE

D• o not spray or pour water on the return air grille, discharge air grille, evaporator coil, control panel,

and sleeve on the room side of the air conditioning unit while cleaning.

E• lectrical component malfunction caused by water could result in electric shock or other electrically

unsafe conditions when the power is restored and the unit is turned on, even after the exterior is dry.

N• ever operate the A/C unit with wet hands.

U• se air conditioner on a single dedicated circuit within the speciﬁ ed amperage rating.

U• se on a properly grounded outlet only.

D• o not remove ground prong of plug.

D• o not cut or modify the power supply cord.

D• o not use extension cords with the unit.

F• ollow all safety precautions and use proper and adequate protective safety aids such as: gloves,

goggles, clothing, adequately insulated tools, and testing equipment etc.

F• ailure to follow proper safety procedures and/or these warnings can result in serious injury or death.

REFRIGERATION SYSTEM REPAIR HAZARDS:

U• se approved standard refrigerant recovering procedures and equipment to relieve pressure before

opening system for repair.

D• o not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor

to moderate injury.

B• e extremely careful when using an oxy-acetylene torch. Direct contact with the torch’s ﬂ ame or hot

surfaces can cause serious burns.

M• ake sure to protect personal and surrounding property with ﬁ re proof materials.

Have a ﬁ re extinguisher at hand while using a torch.•

Pr• ovide adequate ventilation to vent off toxic fumes, and work with a qualiﬁ ed assistant whenever

possible.

A• lways use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for

leaks, ﬂ ushing etc.

M• ake sure to follow all safety precautions and to use proper protective safety aids such as: gloves,

safety glasses, clothing etc.

F• ailure to follow proper safety procedures and/or these warnings can result in serious injury or death.

MECHANICAL HAZARDS:

E• xtreme care, proper judgment and all safety procedures must be followed when testing,

troubleshooting, handling, or working around unit with moving and/or rotating parts.

B• e careful when, handling and working around exposed edges and corners of the sleeve, chassis,

and other unit components especially the sharp ﬁ ns of the indoor and outdoor coils.

U• se proper and adequate protective aids such as: gloves, clothing, safety glasses etc.

F• ailure to follow proper safety procedures and/or these warnings can result in serious injury or death.

PROPERTY DAMAGE HAZARDS

FIRE DAMAGE HAZARDS:

R• ead the Installation/Operation Manual for the air conditioning unit prior to operating.

U• se air conditioner on a single dedicated circuit within the speciﬁ ed amperage rating.

Connect to a properly grounded outlet only.•

D• o not remove ground prong of plug.

D• o not cut or modify the power supply cord.

D• o not use extension cords with the unit.

Be extremely careful when using acetylene torch and protect surrounding property.•

Fa• ilure to follow these instructions can result in ﬁ re and minor to serious property damage.

WATER DAMAGE HAZARDS:

I• mproper installation, maintenance or servicing of the air conditioner unit can result in water damage

to personal items or property.

In• sure that the unit has a sufﬁ cient pitch to the outside to allow water to drain from the unit.

D• o not drill holes in the bottom of the drain pan or the underside of the unit.

F• ailure to follow these instructions can result in damage to the unit and/or minor to serious property

damage.

This service manual is designed to be used in conjunction with the installation and operation manuals provided with

each air conditioning system.

This service manual was written to assist the professional RAC (Room Air Conditioner) service technician to quickly

and accurately diagnose and repair malfunctions.

This manual will deal with subjects in a general nature.

IMPORTANT: It will be necessary for you to accurately identify the unit you are servicing, so you can be certain of a

proper diagnosis and repair (See Unit Identiﬁ cation code on page 6).

INTRODUCTION

Compressor

Fresh Air Vent

Evaporator Coil

Electronic Control

Board

Control Key Pad

Support Bar

Blower Wheel

Air Intake From

Sides and Bottom

Control Key Pad

(User Interface) Chassis Pull

Out Handle

Base Pan

Fan Blade

Fan/Blower Motor

Air Intake Vents

Sleeve

Condenser Coil

Discharge Air

Outdoor Grille

Accumulator

Reversing Valve

Model information can be found on the

name plate behind the front cover.

For your future con ve nience, record

the model information here.

MODEL NUMBER

SERIAL NUMBER

PURCHASE DATE

MODEL NUMBER

YS10M10A

SERIAL NUMBER

LICY00008

VOLTS 115

60 HZ / 1 PH

VOLTS MIN 108

COOLING

BTH/HR 6500

EER 12.0

AMPS 8.0

HEATING

BTH/HR 6500

EER 10.4

AMPS 7.0

REFRIGERANT

30.1 OZ R410A

XXXXXXXXX

600 PSIG HS

300 PSIG LS

XXXXXXXXXX

XXXXXXXXX

XXXXXXXXXX

FUSE PROTECTED

CIRCUITS USE 15A

TIME DELAY FUSE

X XX

XXXXX

XXXXXXXXXX

AIR CONDITIONING CO.

SAN ANTONIO, TEXAS

ASSEMBLED IN MEXICO

MODEL NUMBER

YS10M10A

SERIAL NUMBER

LICY00008

AIR CONDITIONING CO.

SAN ANTONIO, TEXAS

ASSEMBLED IN MEXICO

MODEL AND SERIAL NUMBER LOCATION

Serial Number

Decade Manufactured

L=0 C=3 F=6 J=9

A=1 D=4 G=7

B=2 E=5 H=8

A K A R 00001

Production Run Number

Year Manufactured

A=1 D=4 G=7 K=0

B=2 E=5 H=8

C=3 F=6 J=9

Product Line

R = RAC

Month Manufactured

A=Jan D=Apr G=Jul K=Oct

B=Feb E=May H=Aug L=Nov

C=Mar F=Jun J=Sept M=Dec

1st Digit – Function

S = Straight Cool, Value Series

Y = Heat Pump

E = Electric Heat

2nd Digit

S = Small Chassis

M = Medium Chassis

L = Large Chassis

3rd and 4th Digit - Approximate

BTU/HR in 1000s (Cooling)

Heating BTU/Hr capacity listed in the

Speciﬁ cation/Performance Data Section

8th Digit – Engineering

Major change

7th Digit – Options

0 = Straight Cool &

Heat Pump Models

3 = 3 KW Heat Strip, Nominal

4 = 4 KW Heat Strip, Nominal

5 = 5 KW Heat Strip, Nominal

6th Digit – Voltage

1 = 115 Volts

3 = 230-208 Volts

5th Digit

Alphabetical Modiﬁ er

Model Number Code

S S 08 M 1 0 A

RAC Serial Number Identiﬁ cation Guide

UNIT IDENTIFICATION



 ENERGY STAR® qualiﬁ ed

Model

Cooling

Capacity Btu

Heating

Capacity Btu

Volts

Rated

Cooling

Amps

Cooling

Watts

Heating

Amps

Heating

Watts COP

Energy

Efﬁ ciency

Ratio

EER

Estimated

Yearly

Operating

Cost

Moisture

Removal

Pints/HR

Room Side

Air

Circulation

CFM Sleeve

Net

Weight

Lbs

Kühl

SS08M10 7900 — 115 6.1 677 — — — 11.7 $54 1.0 265 S 99

SS10M10 9500 — 115 7.7 848 — — — 11.2 $68 2.0 260 S 106

SS12M10 12000 — 115 10.0 1071 — — — 11.2 $86 3.0 300 S 112

SS14M10 14000 — 115 12.0 1444 — — — 9.7 $115 3.5 325 S 116

SS12M30 11700/11200 — 230/208 4.8/4.9 1026/982 — — — 11.4/11.4 $82 2.8 275 S 112

SS15M30 14500/14300 — 230/208 6.4/6.8 1405/1385 — — — 10.3/10.3 $112 3.5 360 S 116

SM18M30 17500/17200 — 230/208 7.4/8.0 1635/1617 — — — 10.7/10.7 $131 4.6 350 M 140

SM21M30 20800/20700 — 230/208 9.4/10.3 2080/2070 — — — 10.0/10.0 $166 6.0 425 M 132

SM24M30 23500/23300 — 230/208 11.2/11.9 2500/2479 — — — 9.4/9.4 $200 10.0 390 M 152

SL28M30 27800/27000 — 230/208 13.5/14.4 2865/2812 — — — 9.7/9.6 $229 8.5 600 L 193

SL36M30 36000/35700 — 230/208 19.0/20.5 4235/4200 — — — 8.5/8.5 $338 12.0 725 L 212

Kühl +

Heat Pump

YS10M10* 9500 7500 115 7.8 812 7.6 743 3.0 11.7 $65 1.9 285 S 109

YS12M33 12100/12100 9400/9000 230/208 5.2/5.4 1120/1120 5.6/5.8 1132/1139 2.4 10.8/10.8 $89 3.0 265 S 115

YM18M34 18200/17800 15500/15400 230/208 8.5/8.9 1838/1798 8.5/8.7 1833/1761 2.6 9.9/9.9 $147 5.4 370 M 141

YL24M35 24000/23600 23500/23200 230/208 11.1/12.0 2474/2433 12.2/14.3 2610/2575 2.6 9.7/9.7 † 7.0 600 L 197

Kühl +

Electric Heat

ES12M33 11700/11200 10700/8900 230/208 4.8/4.9 1026/982 16.0/14.7 3500/2900 3.3 11.4/11.4 $82 2.8 275 S 113

ES15M33 14500/14300 10700/8900 230/208 6.4/6.8 1405/1385 16.0/14.7 3500/2900 3.0 10.3/10.3 $112 3.5 360 S 117

EM18M34 17500/17200 13000/10600 230/208 7.4/8.0 1635/1617 19.5/17.0 4200/3500 3.1 10.7/10.7 $131 4.6 350 M 141

EM24M34 23500/23300 13000/10600 230/208 11.2/11.9 2500/2479 19.5/17.0 4200/3500 3.1 9.4/9.4 $200 10.0 390 M 153

EL36M35 36000/35700 17300/14300 230/208 19.0/20.5 4235/4200 24.0/22.4 5500/4650 2.5 8.5/8.5 $338 12.0 725 L 213

PERFORMANCE DATA

SPECIFICATIONS

All models use

environmentally

friendly R-410A

refrigerant.

R-410A

* Operates on 115 volt and is not equipped with supplemental heat. Will not provide heat at temperatures below 40°F.

Friedrich room air conditioners are designed to operate in outdoor temperatures from 60° F to 115° F.

Due to continuing research in new energy-saving technology, speciﬁ cations are subject to change without notice.

As an ENERGY STAR® partner, Friedrich Air Conditioning Co. has determined that the selected ENERGY STAR® () models meet the ENERGY

STAR® guidelines for energy efﬁ ciency.

The consumer- through the AHAM Room Air Conditioner Certiﬁ cation Program- can be certain that the AHAM Certiﬁ cation Seal accurately states

the unit’s cooling and heating capacity rating, the amperes and the energy efﬁ ciency ratio.

Estimated yearly operating cost based on a 2007 national average electricity cost of 10.65 cents per kWh.

† The estimated yearly operating cost of this model was not available at the time the range was published.

*Rating Conditions: 80 degrees F, room air temp. & 50% relative humidity, with 95 degree F, outside air temp & 40% relative humidity, all

systems use R-410A.

SS08M10-A 53 27 115 157 62 12 31 151 400 6.1 32.0 24.0 115 15

YS10M10-A 56 24 114 150 64 12 14 152 395 7.8 7.6 34.5 33.0 115 15

SS10M10-A 52 28 119 150 65 15 28 145 455 8.0 50.0 51.0 115 15

SS12M10-A 50 30 118 163 60 12 23 137 435 10.0 57.0 35.0 115 15

SS14M10-A 49 31 121 170 56 10 22 132 425 12.0 63.0 29.0 115 15

SS12M30-A 49 31 116 158 62 13 21 142 405 4.8 30.0 33.0 230/208v 15

ES12M33-A 51 29 115 158 62 13 18 140 400 4.8 16.0 30.0 33.0 230/208v 15

YS12M33-A 49 31 116 167 65 16 21 140 455 5.2 5.1 26.0 34.5 230/208v15

SS15M30-A 53 27 121 171 62 14 28 138 430 6.4 32.0 32.5 230/208v 15

ES15M33-A 53 27 121 171 62 14 28 138 430 6.4 16.0 32.0 32.5 230/208v 15

SM18M30-A 54 26 122 160 62 9 31 145 450 7.4 42.0 55.0 230/208v 15

EM18M34-A 54 26 122 160 62 9 31 145 450 7.4 19.5 42.0 55.0 230/208v 30

YM18M34-A 50 30 118 168 60 15 24 130 410 8.5 8.5 44.0 49.5 230/208v 15

SM21M30-A 48 32 124 170 55 10 28 137 455 9.4 46.0 55.0 230/208v 15

SM24M30-A 46 34 129 179 55 12 34 123 495 11.0 47.0 40.0 230/208v 20

EM24M34-A 46 34 129 179 55 12 34 123 495 11.0 47.0 40.0 230/208v 30

YL24M34-A 56 24 121 176 62 18 25 135 480 11.1 12.2 47.0 74.0 230/208V 30

SL28M30-A 47 33 126 181 58 12 26 133 430 13.5 60.0 78.5 230/208v 20

SL36M30-A 51 29 129 188 56 12 31 122 470 19.0 96.0 77.0 230/208v 30

BREAKER

FUSE

60 Hertz

Locked Rotor

ELECTRICAL RATINGS

Amps

Cool

Voltage

Amps

Heat

R-410A

REF.

Charge in

OZ.

COOLING

PERFORMANCE

DATA*

EVAP. AIR TEMP. DEG.

Discharge Air Temp.

Dro

Discharge

Temp

OPERATING

PRESSURES

Suction Discharge

Suction

Temp Super Heat Sub-

Cooling

CONDENSER

TEMP DEG. F

Installation Information / Sleeve Dimensions

* Minimum extensions when mounted in a window.

** Minimum widths achieved using one side curtain assembly as opposed to both in a standard installation.

NOTE: S,M and L sleeves may be installed in window with no side kits if properly installed.

Circuit Rating/ Breaker

(B)

(C)

Front

SIDE VIEW

Model

Circuit Rating

Breaker or

T-D Fuse

Plug Face

(NEMA#)

Power Cord

Length (ft.)

Wall Outlet

Appearance

SS08M10, SS10M10, SS12M10 and

SS14M10. YS10M10. 125V - 15A 5 - 15P 6

SS12M30, SS15M30, SM18M30 and

SM21M30. 250V - 15A 6 - 15P 4

SM24M30, SL28M30. ES12M33,

ES15M33. YS12M33 250V - 20A 6 - 20P 4

SL36M30. EM18M34, EM24M34,

EL36M35. YM18M34 and YL24M35

250V - 30A 6 - 30P 4

Sleeve Height Width

Depth

with Front

Shell Depth to

Louvers Minimum

Extension

Into Room*

Minimum

Extension

Outside*

Window Width

Thru-the-wall Installation

Finished Hole

Minimum** Maximum Height Width Max. Depth

S15

15/16

"25

15/16

"29" 8 ¾" 5 ¾” 16

15/16

”27

3/8

"42"16

3/16”

3/8

M17

15/16

"25

15/16

"29" 8 ¾" 5 ¾”16

15/16

”27

3/8

"42"18

3/16”

3/8

”

L20

3/16"

28" 35 ½” 16 ½" 5

3/8

”18

15/16

”29

7/8

”42"20

3/8

" 28 ¼" 15

1/8

”

Keep the filter clean

Make sure that your air conditioner is always in top performing condition

.ylralugerretlifehtgninaelcyb

Provide good air flow

Make sure the airflow to and from the unit is clear. Your air conditioner puts the

conditioned air out at the top of the unit, and takes in unconditioned air at the

bottom. Airflow is critical to good operation. It is just as important on the outside

.dekcolbtonsiroiretxetinuehtdnuorawolfriaehttahtgnidliubehtfo

Unit placement

If your air conditioner can be placed in a window or wall that is shaded by a tree

rosepardgnisU.yltneiciffeeromneveetarepolliwtinueht,gnidliubre hto naro

blinds on the sunny side of the dwelling will also add to your unit’s efficiency.

Insulation

Good insulation will be a big help in maintaining desirable comfort levels.

Doors should have weather stripping. Be sure to caulk around doors and

windows.

Proper installation of seal gasket

Make sure the seal gasket has been installed properly to minimize noise

and improve efﬁ ciency. If the seal gasket has not been installed, please

refer to the installation instructions.

For the best cooling performance and highest energy efficiency

ELECTRICAL DATA

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation.

All electrical connections and wiring MUST be

installed by a qualiﬁ ed electrician and conform to

the National Electrical Code and all local codes

which have jurisdiction.

Failure to do so can result in personal injury or

death.

Not following the above WARNING could result in ﬁ re or

electically unsafe conditions which could cause moderate

or serious property damage.

Read, understand and follow the above warning.

NOTICE

FIRE HAZARD

Wire Size Use ONLY wiring size recommended for single outlet branch circuit.

Fuse/Circuit Breaker Use ONLY the correct HACR type and size fuse/circuit breaker. Read electrical ratings on unit’s

rating plate. Proper circuit protection is the responsibiity of the homeowner.

Grounding Unit MUST be grounded from branch circuit through service cord to unit, or through separate

ground wire provided on permanently connected units. Be sure that branch circuit or general

purpose outlet is grounded.

Receptacle The ﬁ eld supplied outlet must match plug on service cord and be within reach of service cord.

Do NOT alter the service cord or plug. Do NOT use an extension cord. Refer to the table above

for proper receptacle and fuse type.

The consumer - through the AHAM Room Air Conditioner Certiﬁ cation Program - can

be certain that the AHAM Certiﬁ cation Seal accurately states the unit’s cooling and

heating capacity rating, the amperes and the energy efﬁ ciency ratio.

*HACR: Heating Air Conditioning and Refrigeration

Make sure the wiring is adequate for your unit.

If you have fuses, they should be of the time delay type. Before you install

or relocate this unit, be sure that the amperage rating of the circuit breaker

or time delay fuse does not exceed the amp rating listed in Table 1.

DO NOT use an extension cord.

The cord provided will carry the proper amount of electrical power to the

unit; an extension cord may not.

Make sure that the receptacle is compatible with

the air conditioner cord plug provided.

Proper grounding must be maintained at all times. Two prong receptacles

The grounded receptacle should meet all national and local codes and

ordinances. You must use the three prong plug furnished with the air

conditioner. Under no circumstances should you remove the ground

prong from the plug.

Test the power cord

All Friedrich room air conditioners are shipped from the factory with a

Leakage Current Detection Interrupter (LCDI) equipped power cord. The

LCDI device on the end of the cord meets the UL and NEC requirements

for cord connected air conditioners.

To test your power supply cord:

1. Plug power supply cord into a grounded 3 prong outlet.

2. Press RESET (See Figure 1).

3. Press TEST, listen for click; the RESET button trips and pops out.

4. Press and release RESET (Listen for click; RESET button latches

and remains in). The power cord is ready for use.

WARNING: Before Operating Your Unit

MODEL

CIRCUIT RATING

OR TIME DELAY

FUSE

REQUIRED

WALL

RECEPTACLE

AMP VOLT NEMA

NO.

SS08M10, SS10M10,

SS12M10, SS14M10,

YS10M10 15 125 5-15R

SS12M30, SS15M30,

SM18M30, SM21M30 15 250 6-15R

SL25M30, SL28M30,

ES12M33, ES15M33,

YS12M33 20 250 6-20R

SL36M30, EM18M34,

EL25M35, EL36M35,

YM18M34, YL24M35 30 250 6-30R

Table 1.

WARNING

Electrical Shock Hazard

Make sure your electrical receptacle has the

same configuration as your air conditioner’s

plug. If different, consult a Licensed Electrician.

Do not use plug adapters.

Do not use an extension cord.

Do not remove ground prong.

Always plug into a grounded 3 prong oulet.

Failure to follow these instructions can result in

death, fire, or electrical shock.

NOTICE

Do not use the LCDI device as an ON/OFF switch.

Failure to adhere to this precaution may cause

premature equipment malfunction.

Once plugged in, the unit will operate normally without the need to reset

the LCDI device. If the LCDI device fails to trip when tested or if the power

supply cord is damaged, it must be replaced with a new power supply cord

from the manufacturer. Contact our Technical Assistance Line at (800)

541-6645. To expedite service, please have your model number available.

WARNING

15/20A LCDI Device 30A LCDI Device

TEST BEFORE EACH USE

1. PRESS RESET BUTTON

2. PLUG LCDI INTO POWER

RECEPTACLE

3. PRESS TEST BUTTON,

RESET BUTTON SHOULD

POP UP

4. PRESS TEST BUTTON,

FOR USE

DO NOT USE IF ABOVE TEST

FAILS

WHEN GREEN LIGHT IS ON

IT IS WORKING PROPERLY

RESET TEST

WARNING

TEST BEFORE EACH USE

1. PRESS RESET BUTTON

2. PLUG LCDI INTO POWER

RECEPTACLE

3. PRESS TEST BUTTON,

RESET BUTTON SHOULD

POP UP

4. PRESS TEST BUTTON,

FOR USE

DO NOT USE IF ABOVE TEST

FAILS

WHEN GREEN LIGHT IS ON

IT IS WORKING PROPERLY

RESET

TEST

FRR001

Figure 1

Let’s check out how to control your air conditioner. On the control panel,

just to the left of the POWER , is a liquid crystal display (LCD). All of the

control panel function buttons and mode icons can be viewed in Figure 1.

Power On – Press the button to turn on the air conditioner. The

power button will illuminate to indicate the power is on. The backlight on

the power switch will automatically dim to 20% intensity after

120

seconds

of inactivity. The remote control can also be used to turn power ON / OFF

(See Remote Control).

Display –

light. The back light has an automatic two (2) step dim function.

After 120

seconds of inactivity, the display dims to 20% intensity. After an additional

120 seconds, the display switches off. Touching buttons will automatically

bring the display to full brightness.

There are four control push buttons on each side of the display.

SYSTEM Button – Allows the user to sequentially select, Cool

, HEAT , and FAN ONLY operation. Press the button and

the display advances to the next mode. A new icon appears. At the same

time, the mode displays for two (2) seconds, then returns the display to

only units, there are no

e temperature set point for modes other than FAN. Note that on cool

HEAT and modes.

FAN MODE Button – Selects between automatic or

operation. In the mode, the fan only turns on and off when the

compressor operates or the heat function is enabled.

In the SYSTEM FAN ONLY Mode, is not available.

In the

mode, fans speed is determined by your selection on the button.

FAN SPEED Button .sdeeps naf neewteb tceles yllaitneuqes ot desU –

Depending on your model, you can select between LOW, MED, HIGH,

t available on SL and Kuhl+ models.on gnittes xaM .OTUA dna XAM dna

When the button is pressed, the fan speed is temporarily displayed

in the display window, plus a fan speed icon (triangle) changes to indicate

the new speed level. When auto is selected, fan speed automatically varies

depending on the set temperature on the control panel and the actual

room temperature. Let me explain. Say for example you’re working in

your garage and you need to open the big door for several minutes. The

air conditioner will sense a wide difference between the set temperature

and the actual room temperature when this occurs the system fan speed

increases to MAX. The fan speed decreases (in step) as the temperature

difference decreases. When the set point temperature is reached the FAN

speed returns to the original setting.

SCHEDULE Button – The button turns the schedule function on

and off. The current day of the week is indicated as a dot underneath

the day symbol. Pressing the button a second time turns the

schedule function off. The schedule function comes preprogrammed with

recommended energy savings values (Addendum 1). The values may

be changed through the schedule program function (See Programmable

Thermostat).

UP and DOWN arrows – Pressing either (UP) or (DOWN) button

changes the desired room temperature. The factory preset lower and

upper limits are 63° F (16° C) and 99° F (37° C). These buttons are also

used to navigate between function options when using the User Menu or

Maintenance Mode.

BACK Button .detceles neeb sah meti unem a retfa desu si nottub sihT –

It takes the user back to the previous menu level and to save and exit.

DISPLAY/ENTER Button –

Control Panel Operation

% RH

SYSTEM

FAN

MODE

FAN

SPEED

SCHEDULE

BACK

DISPLAY

ENTER

OUTDOOR TEMP

HE AT -> <- C OOLR OOM TEMP SET POINT

AUTO

CONTINUOUS

AUTO CHECK

FI LT ER

OFF

EXIT

AUTO

WAKE AWAY R E T URN NIGHT

MTWTFSS

RESET

AUTO

MODE

COOL

MODE

SCHEDULE

PERIODS

SCHEDULE

ON/OFF

BUTTONS BUTTONS

POWER

HEAT

MODE

MAINTENANCE

REQUIRED

FAN

ONLY

MODE

FRONT

PANE L

LOCK

FILTER

MAINTENANCE WAIT

This button is used in conjunction with User

Menu and Maintenance Mode operation to select items. This button may

also be used to alternatively display the ROOM TEMPERATURE,

OUTDOOR TEMPERATURE, and TIME. If the display is left inactive for

10 seconds it will reset to the TEMPERATURE SET POINT.

Figure 1

CHECK FILTER

appears on screen. The word “ ” appears next to the .nottub

The alert is issued when the fan run .sruoh 005 naht retaerg si emit

This alert may be reset by the user (Refer to Special Functions, Filter Reset).

Maintenance Required – When maintenance is required, a service icon

appears on screen. This icon will not be dismissed until maintenance

has been performed. If the service icon

the icon .noitidnoc lamronba na desnes sah metsys eht ybdnats no si

is established the service icon goes away.

Wait – The WAIT icon .evitca si tuokcol rosserpmoc eht nehw setanimulli

Whenever the compressor shuts off, system pressures must be allowed

to equalize. At this time, an internal timer begins a count-down from up to

240 seconds. If a demand for heat or cool occurs during this count-down

the WAIT icon displays letting you know that the compressor will not

operate until the count-down has completed. This timer prevents damage

to the unit if it tries to start too quickly after it stops running. Normally the

WAIT icon is off. Once the timer has cleared, the air conditioner will

heat or cool based on the temperature setting. Electric heat is not affected

by this timer.

Protection Alert (Freeze) – If the room freeze protection is active, the

display indicates this by showing Room Freeze Protection "FRZ". Once

temperature is less than 40° F (4° C), and the air conditioner is equipped with

electric heat, the room freeze protection will activate. The air conditioner

will run high fan and electric heat until the room temperature reaches

46° F (8° C). Pressing the button delays the freeze protection function

Low Battery – When the battery is low a warning display will be

inserted before other messages such as “COOL”. If the Low Battery

alert is on, the battery in the control unit must be changed. Refer

to the changing the battery procedure. Once the battery is changed, the

alert message will go off. Refer to Troubleshooting Tips. Under normal

conditions the battery life should be greater than 7 years.

ALERTS (The control system has five (5) customer alerts)

ecial Functions

Panel Lock – The front panel push buttons can be locked to prevent

inadvertent operation. To lock the front panel, press and hold the SCHEDULE +

buttons for three (3) seconds. A double beep indicates your mode

change was successful and a icon appears on the display. To unlock

the display, press and hold the + .sdnoces )3( eerht rof snottub

The icon will no longer be visible.

Filter Reset –

icon displays, the timer may be reset by pressing

and holding the button for three (3) seconds. A beep indicates the

system timer was reset and the icon and the word " RESE T " will

no longer be visible.

User Menu Functions – The User Menu Functions allows you to change

the following selections: Set TIME, 12/24 Hour Clock Format, BEEP ON /

OFF, DIM ON / OFF, Emergency Heat (EMHT) ON / OFF, Auto BAND Adjust,

F/ C Select, FRZ ON / OFF, Temp Offset (TO) and the Automatic Temperature

To enter the User Menu, press and hold for 3 seconds, the TIME

selection appears. Use the (UP) or (DOWN) buttons to scroll

through the User Menu. Press the button to enter the displayed

function. If left inactive for 15 minutes the User Menu display will no longer

be visible and it returns to normal operation mode display. To manually

exit the User Menu, press the button.

Time Setting – When in the User Menu, on the Control Panel, use the

(UP) and (DOWN) to select TIME. Push , the hours segment

(UP) and hsup neht ,ruoh eht tes ot )NWOD(

(UP) and (DOWN)

to set the minutes, then push .

NOTE: If the AM or PM indicator is incorrect, push until the hours

(UP) or (DOWN) to advance

the hour segment 12 hours, then push . The day of the week

displays. Use the (UP) or (DOWN) to select the current

day. Press the key to

save and go back to the TIME screen.

Press (UP) to go to the next menu 1224.

NOTE: Pressing the button again will exit the user menu function

mode. Or simply leave the control inactive for 15 minutes and

the control will return back to normal operation.

The hour digits flash first. The user presses the or

to change the hours. To change AM-PM, the hours must be

advanced 12 hours. Press the key to change to the

minutes. To exit the selection process, user presses the

key which will go to the time screen.

The minutes digits flash. The user presses the or

to change the minutes. Press the key to change the days.

To exit the selection process, the user presses the key

which will go to the time screen.

The dot underneath the days of the week begins to blink to

indicate which day it is. If the user has not set the date before,

the dot starts on Monday. If the user is making a correction to

previously set information the dot appears under whichever

day the unit thinks it is. The user can press or to move

the dot left or right (respectively) along the week. The user

presses to loop back to the hours setting. To exit the

selection process, the user presses the key which will go

to the time screen.

Tuesday has been selected. The user presses to loop

back to the hours setting. To exit the selection process and

accept the changes, the user presses the key which will go

to the time screen.

BACK

Sensing Feature (ATSF).

SCHEDULE

User presses or to toggle between Beep On and Beep

Off. Press the key to accept the change and exit the

selection process.

SYSTEM

FAN

MODE

FAN

SPEED

SCHEDULE

BACK

DISPLAY

ENTER

EXIT

Audible Alerts – You can select to have the control beep when entering

menus. When BEEP is displayed press the key then press (UP)

or (DOWN) to toggle between ON and OFF. To accept the change,

press the key to return to the BEEP screen. Press the (UP) to go

to the next menu EMHT on Kühl+ models or F C for Kühl models.

Clock Type – You may select between a 12 hr and 24 hr clock. When

1224 is displayed press the key then press (UP) or (DOWN)

to toggle between 12 hr and 24 hr clock. To accept the change, press the

key to return to the 1224 screen. Press the (UP) to go to the

next menu BEEP.

User presses or to toggle the format between 12HR and

24HR display. To exit the selection process and accept the

change, press the key.

SYSTEM

FAN

MODE

FAN

SPEED

SCHEDULE

BACK

DISPLAY

ENTER

EXIT

Emergency Heat – The Kühl+ heat pump models (YS, YM, YL) have

a special feature that is designed to keep the unit providing heat.

When EMHT is displayed press the key then press (UP) or

.FFO dna NO neewteb elggot ot )NWOD(

To accept the change, press the .neercs THME eht ot nruter ot yek

Press the (UP) to go to the next menu BAND

In the unlikely event of a compressor failure, the heat pump unit may be

switched to operate in the electric heat mode only until repairs can be

made.

User presses or to toggle between Emergency Heat On

and Emergency Heat Off. Press the key to accept the

change and exit the selection process.

SYSTEM

FAN

MODE

FAN

SPEED

SCHEDULE

BACK

DISPLAY

ENTER

EXIT

User presses or to select between AUTO, DM 20, OFF.

Press the key to accept the change and exit the

selection process.

The Dim Auto automatically dims the display to 20% and then

turns it off after a period of time. The Dim 20 setting behavior

is similar to AUTO, but prevents the display from turning off.

Minimum brightness is 20%. The Dim Off setting forces the

display to run at full brightness.

FAN

SPEED

SCHEDULE DISPLAY

ENTER

The menu allows the user to adjust the minimum spread

between the Auto Cool set point and the Auto Heat set point.

Press the or key to adjust. The adjust range is 3 to 10.

SYSTEM

FAN

MODE

FAN

SPEED

SCHEDULE

BACK

DISPLAY

ENTER

EXIT

User presses or at the same time to toggle between

Fahrenheit or Celsius as their temperature unit of choice.

Press the key to accept the change and exit the selection

process.

SYSTEM

FAN

MODE

FAN

SPEED

SCHEDULE

BACK

DISPLAY

ENTER

EXIT

Auto Changeover ‘Dead Band’ – A buffer Zone between heating and

cooling in which no conditioning occurs. For Kühl+ models with the auto

changeover feature you can select the temperature band between heating

and cooling. From the factory the band is set at 3° F (-16° C). The band is

adjustable from 3° F (-16° C) to 10° F (-12° C). When BAND is displayed

press the key then press (UP) or (DOWN) to toggle between

3 and 10. To accept the change, press the key to return to the BAND

screen. Press the (UP) to go to the next menu F C.

Fahrenheit / Celsius Selection – You may select between displaying

temperature in F or C. When F C is displayed press the key then

press (UP) or (DOWN) to toggle between F and C. To accept the

change, press the key to return to the F C screen. Press the

(UP) to go to the next menu FRZ.

Freeze Protection – The Kühl+ models have a special feature that is

designed to keep the interior space above freezing by energizing the

electric heater anytime the indoor room temperature falls to 40° F (4° C) .

With the freeze protection feature turned on, when the unit senses the

indoor temperature fall to 40° F (4° C) the unit will run the heater and high

fan until the space reaches 46° F (8° C) When FRZ is displayed press

the key then press (UP) or (DOWN) to toggle between ON

User presses or to select between Freeze Protection On

& Freeze Protection Off. Press the key to accept the

change and exit the selection process.

SYSTEM

FAN

MODE

FAN

SPEED

SCHEDULE

BACK

DISPLAY

ENTER

EXIT

User presses or to select between ATSF On or Off.

Press the key to accept the change and exit the

selection process.

and OFF. To accept the change, press the key to return to the FRZ

screen. Press the (UP) to go to the next menu TO.

Temperature Offset – In some cases the built in thermostat on the unit

may not display the temperature as it is felt in the room. This can be caused

by many things including the size of the unit, the heat load on the room or

other factors. Friedrich allows you to select the appropriate temperature

offset to make the temperature readout as accurate as possible for your

application. In many cases the factory 0° F (-18° C) offset will provide

an accurate temperature readout. To change the offset follow these

instructions. When TO is displayed press the key then press

(UP) or (DOWN) to toggle between 0° F (-18° C) and 8° F (-13° C) .

In most instances an offset from 0° F (-18° C) to 2° F (-17° C) is all that is

necessary. To accept the change, press the key to return to the TO

screen. Press the (UP) to go to the next menu ATSF.

You may cycle through the menus using the (UP) or (DOWN) keys

User presses or to increment/decrement the temperature

offset (TO) for the room temperature sensor. (Maximum offset

= +/- 8 degrees F). Press the key to accept the change

and exit the selection process

SYSTEM

FAN

MODE

FAN

SPEED

SCHEDULE

BACK

DISPLAY

ENTER

EXIT

Automatic Temperature Sampling Feature - The automatic temperature

sampling feature maintains a balanced temperature throughout the room

by circulating the air for 30 seconds once every 9 minutes that the unit is

For display only. No user selectable options.

to access any of the menus.

Firmware Version - When VER is displayed press Display /

Enter key. The firmware version is displayed as left digit

(Major) and right digit (Minor). This version number should be

used along with Model and Serial numbers for service.

not running when it is set to cooling or heating mode. By circulating the air

the unit can detect hot or cold areas in the room and operate the unit to

cool or warm the room as necessary. This function is only available when

the fan mode is set to ‘AUTO’ or in COOL or HEAT Mode. (Heating function

only available on Kuhl+ units)

Key Sequence

Action

Filter Reset Press BACK key for 3 sec + play double beep ()

Enter User Menu Press DISPLAY/ENTER key for 3 sec + play double beep ()

Enter Maintenance Menu Press SYSTEM + SCHEDULE + BACK + DISPLAY/ ENTER for 3 sec + play double beep ()

Enter & Exit Schedule Programming Press SCHEDULE for 3 sec + play double beep ()

Reset Error Codes & Error History Press





for 3 sec + play double beep ()

Lock Control Panel Press SCHEDULE + DISPLAY/ENTER f

Schedule ON/OFF Press SCHEDULE once each time

or 3 sec + play double beep ()

DIGITAL CONTROL PANEL'S ACCESS CODES SUMMARY

Remote Control Operation

Remote Control – Refer to Figures 11 and 12 during operation description.

Getting Started – Install two (2) AAA batteries in the battery compartment

located on the back of the unit.

Operation – The remote control should be within 25 feet of the air

conditioner for operation (Refer to Figure 10 for effectiveness). Press the

button to turn the remote on. The remote will automatically power off

after 15 seconds if the buttons are not being pressed. The remote must

be on to control the unit.

POWER Button – Turns remote and unit on and off.

SYSTEM Button – Allows the user to sequentially select, Cool ,

HEAT , and FAN ONLY operation. When the button is pressed, the

.egassem yalpsid a aiv detceles neeb sah edom hcihw setacidni yalpsid

Note that when the heating function is not available, the system will

automatically skip the HEAT and AUTO modes.

FAN MODE Button – Selects between automatic ( ) or

operation. In the AUTO mode, the fan only turns on and off when the

compressor operates or the heat function is enabled.

NOTE: AUTO is not available in the FAN ONLY Mode, the display

indicates . In the mode, fan speed is

determined by your selection on the button.

FAN SPEED Button – Used to sequentially select new fan speed, plus

AUTO operation. When the FA N

SPEED button is pressed, the fan speed is

temporarily displayed in the display window, plus a fan speed icon (triangle)

changes to indicate the new speed level. Fan speed automatically varies

depending on the set temperature on the control panel and the actual

room temperature. Let me explain. Say for example you’re working in

your garage and you need to open the big door for several minutes. Since

there is a big difference between your set temperature and the actual room

temperature the system fan speed increases to MAX. It remains at this

speed until the room temperature matches the set temperature.

SCHEDULE Button – The SCHEDULE button turns the schedule function on and

off. Pressing the SCHEDULE button a second time turns the schedule function

off. Only the schedule icon will be displayed.

UP and DOWN Arrows – Pressing either the (UP) or (DOWN)

button changes the desired room temperature. The factory preset lower

and upper limits are 60° F (16° C) and 99° F (37° C). These buttons are

also used to navigate between function options when using the User Menu

or Maintenance Mode.

Remote Effectiveness

Hand Held Remote – Has an operating range of up to 25 ft. The infrared

remote control signal must have a clear path to transmit the command to

the air conditioning unit. The remote signal has some ability to "bounce"

off of walls and furniture similar to a television remote control. The diagram

below shows the typical operating range of the control in a standard room

with 8 ft high ceilings.

30°

45°

60°

30°

45°

60°

25ft

8ft

4ft

25ft

16ft

6ft

30°

45°

60°

45°

60°

25ft

8ft

25ft

7.5ft

SIDE VIEW

TOP VIEW

Changing Temperature from F˚ (Fahrenheit) To C˚ (Celsius) or Reverse

Be within 25' of unit with the remote control. Press the SYSTEM and FAN MODE buttons at the same time and hold for 3

seconds. The display will show the temperature in Celcius. Do the same to reverse temperature to F˚ (Fahrenheit).

Remote Control Operation (Continued)

FRR005

SYSTEM

TEMPERATURE

SCHEDULE

DISPLAY

FAN MODE

POWER

TEMPERATURE

DOWN

FAN SPEED

FRR006

AUTO

ICON

SYSTEM

MODE

FAN

MODE

FAN

SPEED

SCHEDULE

ICON 2 X 16 SEGMENT

DISPLAY

COOL

ICON

HEAT

ICON

FAN ONLY

ICON

°F / °C

ICONs

Figure 1

Figure 2

ELECTRONIC CONTROL SYSTEM MAINTENANCE

Display

Introduction

This section contains information on the maintenance alerts, temperature limiting, diagnostic test and how to access. The electronic

control system has a built in maintenance sub system which works constantly behind the scenes to help identify problems with the air

conditioner or control system. When maintenance is required, a service icon appeasrs on the display screen.

This icon will not be dismissed until maintenance has been performed or the problem cleared.

Note: The wrench icon may be on steady or flash, depending on severity. Maintenance should only be performed by qualified service

personell.

Testing the Display

Press the FAN MODE and FAN SPEED buttons at the same time for 3 seconds. All of the display's icons and functions

should light up. If any of them do not light up, the display should be replaced. When the buttons are released, the display

reverts to the original display.

Electronic Control System Maintenance Operation

To Enter the Maintenance Section:

Press SYSTEM+SCHEDULE+BACK+DISPLAY/ENTER for 6 seconds.

There are 5 maintenance sub-menus M1 through M5.

Maintenance Sub-Menus Access

M1 – Temperature High Limit

Service Only

M2 – Temperature Low Limit

Service Only

M3 – Test Mode Access

Service Only

M4 – Provision Switch Setting & State

Factory Use Only

M5 – Alarms & History

M6 –

Factory Use OnlyFactory Use Only

Service Only

Pressing the ▼or ▲key cycles through the sub-menus. Press DISPLAY/ENTER to

enter a sub-menu. The BACK key is used to exit the menu. Extreme care must

be taken when modifying parameters in the maintenance menus.

Temperature High Limit

Temperature Low Limit

M3 – Test Mode Access

Maintenance function 1 is ready to be selected. Press DISPLAY/ENTER to access

the function.

User presses





to increment or decrement the upper temperature limit. 99°F

is the maximum upper limit. The current stored high limit is displayed when the

screen is selected. Press the BACK key to accept the value, and exit the sub-menu

to the M1 screen.

Maintenance funtion 2 is ready to be selected. Press DISPLAY/ENTER to access

the fuction

User presses





to increment or decrement the lower temperature limit. 60°F is the

minimum lower limit. The current stored lower limit must be displayed when the screen

is selected. Press the BACK key to accept the value, and exit the sub-menu to the M2

screen.

The Following functions Can be Tested

1. System Mode: Cool/Heat Pump Compressor, Electric Heat, Fan Only

2. Fan operation and speeds

Test mode Bypasses:

1. Compressor lock out (time delay)

2. All relay switch’s delays

3. All thermistors delay

4. Automatic heat/cool changeover delay

5. System settings

If M3 switch is left ON it will reset to OFF automatcally after 15 minutes of inactivity.

Maintenance function 3 is ready to be selected. Press

DISPLAY/ENTER to access the function.

User presses the ▼or ▲key to toggle the Test Mode

ON/OFF. Press the BACK key to accept the change

and exit the sub-menu to the M3 screen.

This test selects the system mode of operation directly.

M4 – Switch Access (Unit Configuration)

FACTORY USE ONLY

M6 – Factory Use Only

M5 – Error Codes & History

Error Code

Number of Errors Error Code

On/Off

Maintenance funtion 5 is ready to be selected. Press DISPLAY/ENTER to access the function.

The error code display shows the error code number on the left, and the error code

history on the right. User presses the





keys to cycle through the error codes.

The current state of the error code is shown with the On/Off icon. To exit the

maintenance sub-menu, press the BACK key to return to the M5 screen.

Shown on this display is error code 1 with 4 occurances. The current state is on.The

error code display shows the error code number on the left, and the error code history

on the right. User presses the





keys to cycle through the error codes. The

current state of the error code is shown with the On/Off icon. To exit to the

maintenance sub-menu, press the BACK key to return to the M5 screen. Shown on

this display is error code 6 with 3 occurances. The current state is off.

To Clear Error Codes’ History:

Hold the





keys simultaneously for 3 seconds. See page 56 for alarm status and error codes.

UNIT OPERATION

There are two basic ways to operate the unit - Front Panel and Wallstat. The Front Panel and Wallstat are never active at the

same time. Switching between these modes is controlled via the (FP) jumper on the Wallstat connector. When the jumper is

ON, the mode = Front Panel.

Front Panel

System Mode Sequence (SCHEDULE = OFF)

There are two system modes of operation. One for a cool only unit (see figure 1) and one for a heat-cool unit (see figure 2).

System parameters for each system mode are saved when exiting a system mode, and retrieved when entering a new

system mode.

System Mode: Cool Only Units

System Mode: Heat - Cool Units

Figure 1

Figure 2

System Set Point Mapping Figure

The air conditioner control system is designed to control different product configurations

with a select set of features. Some models just cool, some cool and heat with electric

heat, and others cool and heat with a heat pump and/or electric heat.

The system set points are mapped to the internal controls as shown below.

There are 8 stored & variable set points in the system:

1 - ASPC: Auto Set Point Cool

2 - ASPH: Auto Set Point Heat

3 - CSP: Cool Only Set Point

4 - HSP: Heat Only Set Point

5 - SASPC: Scheduler Auto Set Point Cool

6 - SASPH: Scheduler Auto Set Point Heat

7 - SSPC: Scheduler Set Point Cool Only

8 - SSPH: Scheduler Set Point Heat Only

Control

Deadband

1.5

COOL-HEAT SET POINTS

ELECTRONIC CONTROL SEQUENCE OF OPERATION

Compressor and Reversing Valve Control

Cooling De-Energized

Energized

Off

Heat - Heat Pump

Heat - Electric

Fan Only

* The Reversing valve stays in the last state until a call for heat or cooling (see ﬁ gure below)

Compressor Operation:

Cooling Mode

Once the ambient temperature rises past the cool demand threshold (Cool Set Point + 1.5 ˚F) (see ﬁ gure below), and

the compressor is not locked out, the cooling cycle begins. As shown in the ﬁ gure below, the fan is started 5 seconds

prior to the compressor. Once the ambient temperature has been lowered to the cool set point (Cool Set Point minus

.25 ˚F), the cooling cycle starts to terminate by shutting off the compressor. After a 30 seconds delay, the fan is shut

off. (See ﬁ gure below for graphic details)

The reversing valve only changes when required

to provide cooling or heat pump. The RV valve

stays in it's last state until required to change.

Active Mode Compressor Reversing Valve State

Heat Control (Heat Pump Only)

Heating Mode Control Operation

There are two heating methods: Heat Pump and Electric Resistance Heat.

There are 3 types of units that provide heating: Heat Pump Only (Model YS10M10)

Heat Pump with Electric Heat and Cool with Electric Heat.

Heat Control Operation Heat Pump Only

Once the ambient temperature falls below the Heating Demand Threshold

(1.5 ˚F Below the Heat Set Point Temperature), the heating cycle begins. The fan is turned on 5 seconds later. Once

the ambient temperature has been raised to the Heat Satisﬁ ed Point (Set point + .25 ˚F), the compressor is turned

off. The fan is turned off 30 seconds later. The ﬁ gure below illustrates the basic heat pump operation.

This heating is more complex due to the possibility of two heating methods. If the ambient indoor temperature is be-

low the heat demand threshold (1.5˚F below the heat set point temperature), and the compressor is not locked out,

turn on compressor. If the ambient indoor temperature is 0.25˚F above the heat set point turn off the compressor.

If the compressor is locked out & electric heat is available:

1. Turn on the electric heat until the compressor is not locked out.

2. After lockout, turn off the electric heat, wait 5 seconds, then turn on the compressor.

If Electric Heat is Available

After the Heat button is initially pressed, the unit will run the electric heater until the initial set point is satisﬁ ed (Hot Start

Feature). After the initial start, the unit will switch to Heat Pump heat and decide between Heat Pump heat and Electric

heat based on the following two monitored conditions:

Condition 1

If the outdoor coil temperature sensor drops to 30 ˚F or less for 2 consecutive minutes, the unit will switch to electric heat

if available. Thereafter, the unit will switch back to Heat Pump heat if the outdoor coil temperature sensor rises to 45 ˚F or

greater.

If Electric Heat is not available (out of order) and the outdoor coil temperature sensor drops to 30 ˚F or less for 2

consecutive minutes, then the compressor and fan will turn off. Thereafter, the unit will switch back to Heat Pump heat if

the outdoor coil temperature rises to 45 ˚F or greater.

Heat Pump With Electric Heat Operation

Condition 2

If the Δ (delta) (set point temperature minus the ambient indoor temperature) is greater than 5 ˚F, then the unit will switch

to electric heat, if available. The unit will continue to operate with electric heat until the heat demand is satisﬁ ed. Note that

the electric heat switches on after the Δ temp passes 5°F and the heat pump switches off. Also note that the electric heat

will run until the heat demand is satisﬁ ed. When another heat demand cycle is initiated, the heat pump will run unless the

Δ temp is greater than the electric heat threshold.

Emergency Heat

If a compressor fails in the heating season, the Emergency Heat allows the user to override the Heat Pump and heat with

electric heat only. This is controlled via the user interface (See the User Menu Functions page 12).

Note that if heat is the ﬁ rst demand cycle (demand cycle = call for heat or call for cooling) after power restoration, the

control system will run electric heat for the entire cycle if the unit is equipped with electric heat.

Electric Heat Operation in Cool with Electric Heat Units

When in the Heat mode, with and without Fan Mode Auto (Fan cycling):

If the indoor ambient temperature is below the Heat Demand Threshold (Heat Set Point minus 1.5 ˚F), turn on electric

heat. If Ambient is 0.3 ˚F above the Heat Set Point turn off the electric heat.

System Mode Auto

This mode provides automatic change over between cool and heat. The auto mode runs based on the room ambient

temperature vs. the Demand Thresholds. It is only available in Heat-Cool Unit.

Notes:

The Heat Demand Threshold and the Cool Demand Threshold values are derived from the Auto Set Point in the Auto

Mode (refer to page 22). There is a buffer zone as shown in ﬁ gure , where no heating or cooling is allowed to occur. It is

critical that the Cool Demand Threshold be greater than the Heat Demand Threshold by a minimum of 3° while in the Auto

System Mode. For example, if a user enters a value for the Auto Cooling Set Point that violates the minimum Δ 3° rule, the

Auto Heating Set Point will adjust accordingly. This buffer zone (BAND) can be manually adjusted from 3 to 10° (see the

BAND section page 13).

When programming the schedule, the user has the ﬂ exibility to enter the schedule automatic set point cooling (SASPC)

and the schedule automatic set point heating (SSPH) set points directly. These values are monitored to ensure that they

do not violate the minimum 3° Δ rule. If a violation is detected, the opposite set point will adjust to compensate. The

individual heating and cooling rules apply to the auto mode.

Automatic Change Over Delay (Cool with Heat Units)

The change over delay ensures that any system heating or cooling over shoot does not trigger an opposite demand cycle.

The change over delay = 15 min. This timer blocks the opposite demand cycle from running until the timer expires. As an

example, if the last demand was a cool cycle, and another cool cycle is requested, the timer will not block the request.

However, if the last demand cycle was a cool cycle, and heat cycle is requested, the timer will block the request until the

change over delay is expired.

Heat Pump With Electric Heat Operation (Continued)

Compressor Lock Out Time

The lockout feature ensures that the compressor is de-energized for a period of time. The timer varies randomly

from 180 to 240 seconds

The compressor lockout is initiated every time the compressor is “off” due to:

(1) Satisfying the temperature set point

(2) Changing mode to fan only or heat

(3) Turning the unit off

(4) Control is ﬁ rst plugged in or power is restored after failure

(5) Line power is restored from a brown out condition

Wait ICON (Hour Glass)

The wait icon will be turned on when the compressor is locked out and during demand for cooling or heat pump

compressor operation. The Wait ICON will be turned off when the condition clears.

Cooling Fan Delay

Fan cycle/Auto mode only

When unit cycles cooling ON – starts the fan 5 seconds EARLY. When unit cycles cooling OFF – DELAYS the fan

off for 30 seconds

Note: this fan delay is disabled during Test Mode

Heating Fan Delay

This is only for fan Mode Auto (Fan cycles with cool/heat operation) and not for continuous fan mode. When unit

cycles Heating ON – starts the fan 5 seconds EARLY. When unit cycles Heating OFF – DELAYS the fan off for 15

seconds

Note: the fan delay is disabled during Test Mode

Fan Speed Change Delay

Relay activation is delayed by a minimum number of seconds. The default for this value is 2 seconds and is used to

eliminate relay chatter.

Fan Only System Mode

The fan is turned on and runs at the speciﬁ ed manually set speed.

Only the Fan is turned on. Cool or Heat operation are off.

(This is different than FAN MODE CONTINUOUS where the fan is on with the cool or heat operation).

Fan Only Rules

1. If the SYSTEM FAN ONLY MODE is selected, the Auto fan mode is disabled, and the fan mode is forced to

continuous. In addition, the auto fan speed is disabled. If the user presses the fan speed key, the menu will skip over

the auto selection. The set point temperature display is off.

2. Any fan speed may be manually selected during Fan Only Mode.

Fan Operation (Front Panel Mode)

Heat – Cool – Auto – Fan Only

Models starting with SS, SM have 4 speeds. Models with SL, and all Kuhl+ have 3 speeds

Note that in the AUTO mode, the speed of the fan will be shown by illuminating the number of bars in the speed triangle.

Speed Selection

1 2 3 4 AUTO

Continuous

"On" " On" "On" " On"

AUTO Operation, but never

turns Off. Uses cool set point

or heat set point vs. ambient

temperature. When there is

no demand, operate at the

lowest available speed.

Fan

AUTO

Turns

On or

Off with

heat or

cool

demand

Turns

On or

Off with

heat or

cool

demand

Turns

On or

Off with

heat or

cool

demand

Turns

On or

Off with

heat or

cool

demand

AUTO operation turns On or

Off with heat or cool demand

Uses cool set point or heat

set point vs. ambient

temperature

Mode

Fan Only "On" " On" "On" " On" Disabled

Table

Fan ICON Detail

The system may have a 3 or 4 speed fan. The Fan Speed ICON will Display as per the table below.

Fan Mapping

UNIT OPERATION WITH A WALL-STAT

Front Panel Display Operation in Wall-Stat Mode

The indoor ambient temperature sensor is disabled. All buttons are disabled with the following exception:

A. Maintenance commands.

B. The user menu for Freeze protection (Display/Enter button for Kuhl+ only units).

C. First Button push to illuminate the back light (display will dim).

Maintenance features are operational. This includes the Check Filter, Lock Panel, M3, M4, M5, and the Service

wrench icon. Under T-stat operation, as a default, the selected operating Mode (Cool, Heat or Fan) will not show on

the front panel. The Service ICON ( ) is displayed if a malfunction is detected.

Cool/Heat/Fan modes and Fan speed operations are controlled by the remote wall thermostat.

The fan speeds can be Low or Max for 4 speed units and Low or High for 3 speed units. (T-stat selected must have

2 speed capabilities)

Thermostat terminals requirements:

Must be single stage heat/cool.

For cooling only units: C, R, G, Y.

For cooling with electric heat units: C, R, G, Y, W.

For heat pump units: C, R, G, Y, W, B.

(See page 68 for RT5 T-Stat wiring diagrams)

During Heat Mode:

The B terminal must be continuously energized. The W terminal from the T-Stat must have 24 V AC output to call

for heat. The control board decides on whether to turn on the Heat Pump Heat (compressor) or Electric Resistance

Heat. The Y terminal should not have 24 VAC output during Heat Mode.

Remove the decorative front cover by using the tool

provided (see ﬁ gure below).

Tighten the four (4) captive screws as indicated by the

arrows in the ﬁ gure above before closing the front panel

(do not over tighten). Ensure the ﬁ lter is in place.

Make sure curtains do not block the side air intake

Notes on reattaching the decorative front cover:

Align the cord notch over the cord and center the fresh

air lever. Align the cover over the User Interface

(UI) to ensure it is clear around it and it does not

depress any buttons. If not installed correctly the

wrench alert symbol could ﬂ ash.

Remove the decorative front cover. (See ﬁ gure at

left). Remove the chassis Entrygard Retainer Wire by

removing the screw at the front right bottom corner screw

(See Figure below). Save this screw for reattachment

after reinstalling the chassis.

Hold the cabinet stationary then use the hand grips on

both ends of the control unit support bracket to pull the

chassis out of the cabinet (see below).

Before reinserting the chassis into the sleeve ensure to

properly reinstall the chassis seal gasket.

REMOVING THE FRONT COVER REMOVING THE CHASSIS

ELECTRIC SHOCK HAZARD

WARNING

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

ELECTRIC SHOCK HAZARD

WARNING

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

REPLACING THE INDOOR COIL

THERMISTOR

REPLACING THE CONTROL BOARD

ELECTRIC SHOCK HAZARD

WARNING

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

Remove the decorative front cover (see page 30).

Remove all indicated screws below (8 total, see ﬁ gure

below). Remove the Discharge Sensor and the User

Interface plugs from the control board.

Remove the decorative front cover (see page 30).

Disconnect discharge sensor plug (red)

Disconnect the User Interface plug (white)

Remove the 3 screws indicated below.

Pull control board and mount plate out and disconnect

the following connectors from it:

Power, capacitor, thermistors, fan, reversing valve

and heater.

Remove the hex screw holding the control board to

its mount plate. Pull out the control board (see ﬁ gure

below).

Replace the indoor coil sensor. Ensure to properly clip

and insulate it at the same location (see ﬁ gure below).

Remove the screws indicated at the side and back plate

(6 total, see ﬁ gure below). Partially lift the top cover and

at the same time carefully swing out from the top, the

back and side plate.

ELECTRIC SHOCK HAZARD

WARNING

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

Swing

Out

ELECTRIC SHOCK HAZARD

WARNING

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

Low Voltage Interface Connector

All Kuhl and Kuhl + units have a low voltage interface connector through

which a Remote Wall Thermostat, Desk Control and Auxiliary Fan’s Relay

can be connected. The interface connector is located on the left side behind

the decorative front cover.

Interface Connector Definitions

Interface Connector Location

Table 1

Front Panel. Wire jumper between FP and

F2 enables front panel operation. Jumper off

enables remote wall t-stat operation.

Used with F1 to provide 24 VAC to external

fan relay. (See above for use with FP)

Used with F2 to provide 24 VAC to

external fan relay.

Used with D1 for desk control on or off

operation.

Used with D2 for desk control on or off

operation.

Common Ground Terminal

Call for high fan

Call for low fan

Call for compressor

Call for heating

24V Power from Electronic Control to Wall

Call for heat pump reversing valve

Figure 1

Adding a Remote Wall Thermostat

An external thermostat may be added to the air conditioner to provide

remote temperature sensing and control.

Thermostat Selection

Friedrich recommends the use of either the Friedrich RT4 or RT5. These

thermostats are single stage heat/cool, manual changeover. The RT4 is a

digital display thermostat with single speed fan control. The RT5 features

a digital display, two fan speed selection, ﬁ lter check light, temperature

limiting, status indicator light, room temperature offset, backlight and

battery backup. Other thermostats may be used as long as they are single

stage heat/cool and are conﬁ gured correctly for the unit.

Thermostat terminals requirements:

For cooling only units: C, R, G, Y.

For cooling with electric heat units: C, R, G, Y, W.

For heat pump units: C, R, G, Y, W, B.

For two fan speeds, thermostat must have 2 fan speed selection.

During Heat Pump Mode:

The B terminal must be continuously energized. The W terminal must have

24 VAC output to call for heat. The control board decides on whether to

turn on the Heat Pump Heat (compressor) or Electric Heat. The Y terminal

should not have 24 VAC output during heat mode.

To enable the remote thermostat operation, remove the jumper between

terminals FP & F2 on the interface connector. Connect the thermostat

using Figure 1 and Table 1 as a guide.

Procedure

1) Unplug the unit.

2) Unscrew and remove the decorative front cover. (Page 30)

3) Locate the Interface Connector (24 VAC terminal strip (See ﬁ gure 1 at

left) and remove the jumper wire at FP and F2.

4) Make the wire connections according to the conﬁ guration needed for

your unit (see above or page 68 for wiring diagrams).

5) Once each wire is matched and connected, the unit is now ready to be

controlled by the thermostat.

6) Reattach the decorative front cover (see page 30).

Note: Under T-Stat operation the front panel is disabled

except the Maintenance functions (see page 29 for details).

Connecting a Remote Wall

Thermostat

Remote Wall Thermostat Location

The thermostat should not be mounted where it may be affected by drafts,

discharge air from registers (hot or cold), or heat radiated from the sun

appliances, windows etc.. The thermostat should be located about 5 Ft.

above the ﬂ oor in an area of average temperature, with good air circulation.

Mercury bulb type thermostats MUST be level to control temperature

accurately to the desired set-point. Electronic digital type thermostats

should be level for aesthetics.

Note: An improperly operating or poorly located remote wall thermostat

can be the source of perceived equipment problems. A careful check of the

thermostat’s location and wiring must be made then to ensure that it is not

the source of problems.

Desk Control

The unit’s electronic control has built-in provisions for connection to an

external switch to control power to the unit. The switch can be a central

desk control system or even a normally open door switch.

For desk control operation, connect one side of the switch to the D1

terminal and the other to the D2 terminal (See page 32). Whenever the

switch closes, the unit operation will stop.

Maximum Wire Length for Desk Control Switch

Auxiliary Fan Control

The electronic control also has the ability to control a 24 VAC relay to

activate an auxiliary, or transfer fan. The outputs are listed as F1 and F2 on

the interface connector (See page 32).

To connect the relay, simply wire one side of the relay to F1 and the other

side to F2. Anytime that the fan runs, the terminals will send a 24 VAC

signal to the relay. The relay must be 24 VAC, 50mA or less.

Note: The Desk Control, Auxiliary Fan relay and wires must be ﬁ eld supplied.

Airflow Selection and Adjustment

Air flow direction adjustment

left or right side of the discharge opening. Each of the banks of louvers

can be directed left, right, up or down in order to achieve the most optimum

move it in the direction that you would like the air to be directed. Please

louvers than the other.

TO BRING IN FRESH AIR – Move the lever to the Fresh Air position

which allows outside air to enter the room. This is useful in fall and spring as

a means of bringing in fresh outside air when using FAN ONLY . It can also

be used in the summer with the compressor in the Cooling Mode if you wish.

Fresh air and exhaust control

Your air conditioner has the ability to bring fresh air into the room or exhaust

stale air out of the room. The control slide is found on the upper part of

the unit (See Figure).

TO EXHAUST INDOOR AIR – Move the lever to the Exhaust

position. This will allow stale air to be expelled to the outside of the dwelling.

This is especially handy in the spring or fall when indoor air tends to get

stale, or after a social gathering involving smokers, or to remove cooking

odors.

BEST PERFORMANCE – Move the lever to the Re-Circulate Position

FRR008

CAPACITORS

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before servicing.

Discharge capacitor with a 20,000 Ohm 2 Watt

resistor before handling.

Failure to do so may result in personal injury,

or death.

Many motor capacitors are internally fused. Shorting the

terminals will blow the fuse, ruining the capacitor. A 20,000

ohm 2 watt resistor can be used to discharge capacitors

safely. Remove wires from capacitor and place resistor

across terminals. When checking a dual capacitor with

a capacitor analyzer or ohmmeter, both sides must be

tested.

Capacitor Check with Capacitor Analyzer

The capacitor analyzer will show whether the capacitor is

“open” or “shorted.” It will tell whether the capacitor is within

its micro farads rating and it will show whether the capacitor

is operating at the proper power-factor percentage. The

instrument will automatically discharge the capacitor when

the test switch is released.

Capacitor Connections

The starting winding of a motor can be damaged by a

shorted and grounded running capacitor. This damage

usually can be avoided by proper connection of the running

capacitor terminals.

From the supply line on a typical 230 volt circuit, a 115 volt

potential exists from the “R” terminal to ground through a

possible short in the capacitor. However, from the “S” or

start terminal, a much higher potential, possibly as high as

400 volts, exists because of the counter EMF generated

in the start winding. Therefore, the possibility of capacitor

failure is much greater when the identiﬁ ed terminal is

connected to the “S” or start terminal. The identiﬁ ed

terminal should always be connected to the supply line, or

“R” terminal, never to the “S” terminal.

When connected properly, a shorted or grounded running

capacitor will result in a direct short to ground from the “R”

terminal and will blow the line fuse. The motor protector

will protect the main winding from excessive temperature.

Dual Rated Run Capacitor Hook-up

BLOWER/FAN MOTOR - TEST

1. Determine that capacitor is serviceable.

2. Disconnect fan motor wires from fan speed switch or

system switch.

3. Apply “live” test cord probes on black wire and common

terminal of capacitor. Motor should run at high speed.

4. Apply “live” test cord probes on red wire and common

terminal of capacitor. Motor should run at low speed.

5. Apply “live” test cord probes on each of the remaining

wires from the speed switch or system switch to test

intermediate speeds. If the control is in the “MoneySaver”

mode and the thermostat calls for cooling, the fan will

start - then stop after approximately 2 minutes; then the

fan and compressor will start together approximately 2

minutes later.

Figure 23

Blower/Fan Motor

FAN MOTOR

A single phase permanent split capacitor motor is used to drive

the evaporator blower and condenser fan. A self-resetting

overload is located inside the motor to protect against high

temperature and high amperage conditions. (See Figure 23)

ELECTRIC SHOCK HAZARD

WARNING

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

COMPONENTS TESTING

HEATING ELEMENT

All heat pumps and electric heat models are equipped

with a heating element with the exception of model

YS10M10. The other “YS” and “ES” models are

equipped with a 3.3 KW element. The “YM” and “EM”

models are equipped with a 4.0 KW element. The

“YL” and “EL” models are equipped with a 5.2 KW

element.

The heating element contains a fuse link and a heater

limit switch. The fuse link is in series with the power

supply and will open and interrupt the power when the

temperature reaches 199°F or a short circuit occurs in

the heating element. Once the fuse link separates, a

new fuse link must be installed.

NOTE: Always replace with the exact

replacement.

The heater element has a high limit control. This

control is a bimetal thermostat mounted in the top of

the heating element.

Should the fan motor fail or ﬁ lter become clogged,

the high limit control will open and interrupt power to

the heater before reaching an unsafe temperature

condition.

The control is designed to open at 110°F ±6°F. Test

continuity below 110°F and for open above 110°F.

HEATING ELEMENT (Heat Pump Models)

The heating element for the “Y” model is energized

by an outdoor thermistor via the electronic control

board. The outdoor defrost thermistor is adjusted at

a predetermined temperature to bring on the heating

element and turn off the compressor. The room

Heating Element

Sample

TESTING THE HEATING ELEMENT

Testing of the elements can be made with an ohmmeter

across the terminals after the connecting wires

have been removed. A cold resistance reading of

approximately 14.5 ohms for the 3.3 KW heater, 11.9

ohms for the 4.0 KW heater and 9.15 ohms for the 5.2

KW heater should be registered.

DRAIN PAN VALVE

During the cooling mode of operation, condensate

which collects in the drain pan is picked up by the con-

denser fan blade and sprayed onto the condenser coil.

This assists in cooling the refrigerant plus evaporating

the water.

During the heating mode of operation, it is necessary

that water be removed to prevent it from freezing during

cold outside temperatures. This could cause the con-

denser fan blade to freeze in the accumulated water

and prevent it from turning.

To provide a means of draining this water, a bellows

type drain valve is installed over a drain opening in the

base pan.

This valve is temperature sensitive and will open when

the outside temperature reaches 40°F. The valve will

close gradually as the temperature rises above 40°F to

fully close at 60°F.

Bellows Assembly

Drain Pan Valve

COMPONENTS TESTING

ELECTRIC SHOCK HAZARD

WARNING

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

Suction

Line

Evaporator

Coil

Metering

Device

Refrigerant

Strainer

Discharge

Line

Condenser

Coil

Compressor

Refrigerant Drier Liquid

Line

A good understanding of the basic operation of the

refrigeration system is essential for the service technician.

Without this understanding, accurate troubleshooting of

refrigeration system problems will be more difﬁ cult and time

consuming, if not (in some cases) entirely impossible. The

refrigeration system uses four basic principles (laws) in its

operation they are as follows:

1. “Heat always ﬂ ows from a warmer body to a cooler

body.”

2. “Heat must be added to or removed from a substance

before a change in state can occur”

3. “Flow is always from a higher pressure area to a lower

pressure area.”

4. “The temperature at which a liquid or gas changes state

is dependent upon the pressure.”

The refrigeration cycle begins at the compressor. Starting

the compressor creates a low pressure in the suction line

which draws refrigerant gas (vapor) into the compressor.

The compressor then “compresses” this refrigerant, raising

its pressure and its (heat intensity) temperature.

The refrigerant leaves the compressor through the discharge

Line as a hot High pressure gas (vapor). The refrigerant

enters the condenser coil where it gives up some of its

heat. The condenser fan moving air across the coil’s ﬁ nned

surface facilitates the transfer of heat from the refrigerant to

the relatively cooler outdoor air.

When a sufﬁ cient quantity of heat has been removed from

the refrigerant gas (vapor), the refrigerant will “condense”

(i.e. change to a liquid). Once the refrigerant has been

condensed (changed) to a liquid it is cooled even further by

the air that continues to ﬂ ow across the condenser coil.

The RAC design determines at exactly what point (in the

condenser) the change of state (i.e. gas to a liquid) takes

place. In all cases, however, the refrigerant must be

totally condensed (changed) to a Liquid before leaving the

condenser coil.

The refrigerant leaves the condenser Coil through the liquid

line as a warm high pressure liquid. It next will pass through

the refrigerant drier (if so equipped). It is the function of the

drier to trap any moisture present in the system, contaminants,

and large particulate matter.

The liquid refrigerant next enters the metering device. The

metering device is a capillary tube. The purpose of the

metering device is to “meter” (i.e. control or measure) the

quantity of refrigerant entering the evaporator coil.

In the case of the capillary tube this is accomplished (by

design) through size (and length) of device, and the pressure

difference present across the device.

Since the evaporator coil is under a lower pressure (due to

the suction created by the compressor) than the liquid line,

the liquid refrigerant leaves the metering device entering the

evaporator coil. As it enters the evaporator coil, the larger

area and lower pressure allows the refrigerant to expand

and lower its temperature (heat intensity). This expansion is

often referred to as “boiling”. Since the unit’s blower is moving

indoor air across the ﬁ nned surface of the evaporator coil,

the expanding refrigerant absorbs some of that heat. This

results in a lowering of the indoor air temperature, hence the

“cooling” effect.

The expansion and absorbing of heat cause the liquid

refrigerant to evaporate (i.e. change to a gas). Once the

refrigerant has been evaporated (changed to a gas), it is

heated even further by the air that continues to ﬂ ow across

the evaporator coil.

The particular system design determines at exactly what

point (in the evaporator) the change of state (i.e. liquid to a

gas) takes place. In all cases, however, the refrigerant must

be totally evaporated (changed) to a gas before leaving the

evaporator coil.

The low pressure (suction) created by the compressor

causes the refrigerant to leave the evaporator through the

suction line as a cool low pressure vapor. The refrigerant then

returns to the compressor, where the cycle is repeated.

REFRIGERATION SEQUENCE OF OPERATION

• R-410A pressure is approximately 60% higher than R-22 pressure.

• R-410A cylinders must not be allowed to exceed 125 F, they may leak or rupture.

• R-410A must never be pressurized with a mixture of air, it may become

ﬂ ammable.

• Servicing equipment and components must be speciﬁ cally designed for use with R-410A and

dedicated to prevent contamination.

• Manifold sets must be equipped with gauges capable of reading 750 psig (high side) and 200

psig (low side), with a 500-psig low-side retard.

• Gauge hoses must have a minimum 750-psig service pressure rating

• Recovery cylinders must have a minimum service pressure rating of 400 psig, (DOT 4BA400

and DOT BW400 approved cylinders).

• POE (Polyol-Ester) lubricants must be used with R-410A equipment.

• To prevent moisture absorption and lubricant contamination, do not leave the refrigeration

system open to the atmosphere longer than 1 hour.

• Weigh-in the refrigerant charge into the high side of the system.

• Introduce liquid refrigerant charge into the high side of the system.

• For low side pressure charging of R-410A, use a charging adaptor.

• Use Friedrich approved R-410A ﬁ lter dryers only.

The following is a list of important considerations when working with R-410A equipment

R-410A SEALED SYSTEM REPAIR CONSIDERATIONS

Do not puncture, heat, expose to ﬂ ame or incinerate.

Only certiﬁ ed refrigeration technicians should

service this equipment.

R410A systems operate at higher pressures than

R22 equipment. Appropriate safe service and

handling practicces must be used.

Only use gauge sets designed for use with R410A.

Do not use standard R22 gauge sets.

WARNING

Refrigeration system under high pressure

Proper refrigerant charge is essential to proper unit operation.

Operating a unit with an improper refrigerant charge will

result in reduced performance (capacity) and/or efﬁ ciency.

Accordingly, the use of proper charging methods during

servicing will insure that the unit is functioning as designed

and that its compressor will not be damaged.

Too much refrigerant (overcharge) in the system is just as bad

(if not worse) than not enough refrigerant (undercharge). They

both can be the source of certain compressor failures if they

remain uncorrected for any period of time. Quite often, other

problems (such as low air ﬂ ow across evaporator, etc.) are

misdiagnosed as refrigerant charge problems. The refrigerant

circuit diagnosis chart will assist you in properly diagnosing

these systems.

An overcharged unit will at times return liquid refrigerant

(slugging) back to the suction side of the compressor eventually

causing a mechanical failure within the compressor. This

mechanical failure can manifest itself as valve failure, bearing

failure, and/or other mechanical failure. The speciﬁ c type of

failure will be inﬂ uenced by the amount of liquid being returned,

and the length of time the slugging continues.

Not enough refrigerant (undercharge) on the other hand, will

cause the temperature of the suction gas to increase to the point

where it does not provide sufﬁ cient cooling for the compressor

motor. When this occurs, the motor winding temperature will

increase causing the motor to overheat and possibly cycle open

the compressor overload protector. Continued overheating of

the motor windings and/or cycling of the overload will eventually

lead to compressor motor or overload failure.

Sealed Refrigeration System contains refrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

HIGH PRESSURE HAZARD

Unplug and/or disconnect all electrical power

to the unit before performing inspections,

maintenances or service.

Failure to do so could result in electric shock,

serious injury or death.

WARNING

RISK OF ELECTRIC SHOCK

R-410A SEALED REFRIGERATION SYSTEM REPAIRS

SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.

IMPORTANT

EQUIPMENT REQUIRED:

1. Voltmeter

2. Ammeter

3. Ohmmeter

4. E.P.A. Approved Refrigerant Recovery System

5. Vacuum Pump (capable of 200 microns or less

vacuum.)

6. Acetylene Welder

7. Electronic Halogen Leak Detector capable of

detecting HFC (Hydroﬂ uorocarbon) refrigerants.

8. Accurate refrigerant charge measuring device such

as:

a. Balance Scales - 1/2 oz. accuracy

b. Charging Board - 1/2 oz. accuracy

9. High Pressure Gauge - (0 to 750 lbs.)

10. Low Pressure Gauge - (-30 to 200 lbs.)

11. Vacuum Gauge - (0 - 1000 microns)

12. Facilities for ﬂ owing nitrogen through refrigeration tubing

during all brazing processes.

EQUIPMENT MUST BE CAPABLE OF:

1. Recovering refrigerant to EPA required levels.

2. Evacuation from both the high side and low side of the

system simultaneously.

3. Introducing refrigerant charge into high side of the

system.

4. Accurately weighing the refrigerant charge introduced

into the system.

Refrigerant Charging

NOTE: Because the RAC system is a sealed system, service

process tubes will have to be installed. First install a line tap

and remove refrigerant from system. Make necessary sealed

system repairs and vacuum system. Crimp process tube

line and solder end shut. Do not leave a service valve in the

sealed system.

3. Install a process tube to sealed system.

4. Make necessary repairs to system.

5. Evacuate system to 200 microns or less.

6. Weigh in refrigerant with the property quantity of R-410A

refrigerant.

7. Start unit, and verify performance.

8. Crimp the process tube and solder the end shut.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with a torch.

Failure to follow these procedures could

result in moderate or serious injury.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with liquid refrigerant.

Failure to follow these procedures could

result in minor to moderate injury.

WARNING

CAUTION

BURN HAZARD

FREEZE HAZARD

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with a torch.

Failure to follow these procedures could

result in moderate or serious injury.

WARNING

BURN HAZARD

Method Of Charging / Repairs

The acceptable method for charging the WallMaster system

is the Weighed in Charge Method. The weighed in charge

method is applicable to all units. It is the preferred method to

use, as it is the most accurate.

The weighed in method should always be used whenever

a charge is removed from a unit such as for a leak repair,

compressor replacement, or when there is no refrigerant

charge left in the unit. To charge by this method, requires the

following steps:

1. Install a piercing valve to remove refrigerant from the

sealedsystem. (Piercing valve must be removed from the

system before recharging.)

2. Recover Refrigerant in accordance with EPA regulations.

Undercharged Refrigerant Systems

An undercharged system will result in poor performance

(low pressures, etc.) in both the heating and cooling

cycle.

Whenever you service a unit with an undercharge of

refrigerant, always suspect a leak. The leak must be

repaired before charging the unit.

To check for an undercharged system, turn the unit on,

allow the compressor to run long enough to establish

working pressures in the system (15 to 20 minutes).

During the cooling cycle you can listen carefully at the exit

of the metering device into the evaporator; an intermittent

hissing and gurgling sound indicates a low refrigerant

charge. Intermittent frosting and thawing of the evaporator

is another indication of a low charge, however, frosting

and thawing can also be caused by insufﬁ cient air over

the evaporator.

Checks for an undercharged system can be made at

the compressor. If the compressor seems quieter than

normal, it is an indication of a low refrigerant charge.

Overcharged Refrigerant Systems

A check of the amperage drawn by the compressor

motor should show a lower reading. (Check the Unit

Speciﬁ cation.) After the unit has run 10 to 15 minutes,

check the gauge pressures. Gauges connected to system

with an undercharge will have low head pressures and

substantially low suction pressures.

of the evaporator will not be encountered because the

refrigerant will boil later if at all. Gauges connected to

system will usually have higher head pressure (depending

upon amount of over charge). Suction pressure should be

slightly higher.

Compressor amps will be near normal or higher.

Noncondensables can also cause these symptoms. To

conﬁ rm, remove some of the charge, if conditions improve,

system may be overcharged. If conditions don’t improve,

Noncondensables are indicated.

Whenever an overcharged system is indicated, always

make sure that the problem is not caused by air ﬂ ow

problems. Improper air ﬂ ow over the evaporator coil may

indicate some of the same symptoms as an over charged

system.

An overcharge can cause the compressor to fail, since it

would be “slugged” with liquid refrigerant.

The charge for any system is critical. When the compressor

is noisy, suspect an overcharge, when you are sure that

the air quantity over the evaporator coil is correct. Icing

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation.

Extreme care must be used, if it becomes

necessary to work on equipment with power

applied.

Failure to do so could result in serious injury or

death.

Sealed Refrigeration System contains refrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

HIGH PRESSURE HAZARD

Restricted Refrigerant System

Troubleshooting a restricted refrigerant system can be

difﬁ cult. The following procedures are the more common

problems and solutions to these problems. There are two

types of refrigerant restrictions: Partial restrictions and

complete restrictions.

A partial restriction allows some of the refrigerant to

circulate through the system.

With a complete restriction there is no circulation of

refrigerant in the system.

Restricted refrigerant systems display the same symptoms

as a “low-charge condition.”

When the unit is shut off, the gauges may equalize very

slowly.

Gauges connected to a completely restricted system will

run in a deep vacuum. When the unit is shut off, the gauges

will not equalize at all.

A quick check for either condition begins at the evaporator.

With a partial restriction, there may be gurgling sounds

at the metering device entrance to the evaporator. The

evaporator in a partial restriction could be partially frosted

or have an ice ball close to the entrance of the metering

device. Frost may continue on the suction line back to the

compressor.

Often a partial restriction of any type can be found by feel,

as there is a temperature difference from one side of the

restriction to the other.

With a complete restriction, there will be no sound at the

metering device entrance. An amperage check of the

compressor with a partial restriction may show normal

current when compared to the unit speciﬁ cation. With a

complete restriction the current drawn may be considerably

less than normal, as the compressor is running in a deep

vacuum (no load.) Much of the area of the condenser will

be relatively cool since most or all of the liquid refrigerant

will be stored there.

The following conditions are based primarily on a system

in the cooling mode.

METERING DEVICE

Capillary Tube Systems

All units are equipped with capillary tube metering

devices.

Checking for restricted capillary tubes.

1. Connect pressure gauges to unit.

2. Start the unit in the cooling mode. If after a few minutes

of operation the pressures are normal, the check valve

and the cooling capillary are not restricted.

3. Switch the unit to the heating mode and observe the

gauge readings after a few minutes running time. If

the system pressure is lower than normal, the heating

capillary is restricted.

4. If the operating pressures are lower than normal in both

the heating and cooling mode, the cooling capillary is

restricted.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with a torch.

Failure to follow these procedures could

result in moderate or serious injury.

WARNING

BURN HAZARD

HERMETIC COMPONENTS CHECK

One-way Check Valve

(Heat Pump Models)

CHECK VALVE

A unique two-way check valve is used on the reverse cycle

heat pumps. It is pressure operated and used to direct the

ﬂ ow of refrigerant through a single ﬁ lter drier and to the

proper capillary tube during either the heating or cooling

cycle.

NOTE: The slide (check) inside the valve is made of teﬂ on.

Should it become necessary to replace the check valve,

place a wet cloth around the valve to prevent overheating

during the brazing operation.

CHECK VALVE OPERATION

In the cooling mode of operation, high pressure liquid enters

the check valve forcing the slide to close the opposite port

(liquid line) to the indoor coil. Refer to refrigerant ﬂ ow chart.

This directs the refrigerant through the ﬁ lter drier and cooling

capillary tube to the indoor coil.

In the heating mode of operation, high pressure refrigerant

enters the check valve from the opposite direction, closing

the port (liquid line) to the outdoor coil. The ﬂ ow path of

the refrigerant is then through the ﬁ lter drier and heating

capillary to the outdoor coil.

Failure of the slide in the check valve to seat properly in

either mode of operation will cause ﬂ ooding of the cooling

coil. This is due to the refrigerant bypassing the heating or

cooling capillary tube and entering the liquid line.

COOLING MODE

In the cooling mode of operation, liquid refrigerant from

condenser (liquid line) enters the cooling check valve

forcing the heating check valve shut. The liquid refrigerant

is directed into the liquid dryer after which the refrigerant

is metered through cooling capillary tubes to evaporator.

(Note: liquid refrigerant will also be directed through the

heating capillary tubes in a continuous loop during the

cooling mode).

HEATING MODE

In the heating mode of operation, liquid refrigerant from

the indoor coil enters the heating check valve forcing the

cooling check valve shut. The liquid refrigerant is directed

into the liquid dryer after which the refrigerant is metered

through the heating capillary tubes to outdoor coils. (Note:

liquid refrigerant will also be directed through the cooling

capillary tubes in a continuous loop during the heating

mode).

CUT/SEVER HAZARD

WARNING

Be careful with the sharp edges and corners.

Wear protective clothing and gloves, etc.

Failure to do so could result in serious injury.

NOTE: System operating pressures must be near

normal before valve can shift.

REVERSING VALVE DESCRIPTION/OPERATION

The Reversing Valve controls the direction of refrigerant

ﬂ ow to the indoor and outdoor coils. It consists of a

pressure-operated, main valve and a pilot valve actuated

by a solenoid plunger. The solenoid is energized during the

heating cycle only. The reversing valves used in the RAC

system is a 2-position, 4-way valve.

The single tube on one side of the main valve body is the

high-pressure inlet to the valve from the compressor. The

center tube on the opposite side is connected to the low

pressure (suction) side of the system. The other two are

connected to the indoor and outdoor coils. Small capillary

tubes connect each end of the main valve cylinder to the

“A” and “B” ports of the pilot valve. A third capillary is a common

return line from these ports to the suction tube on the main

valve body. Four-way reversing valves also have a capillary

tube from the compressor discharge tube to the pilot valve.

The piston assembly in the main valve can only be shifted

by the pressure differential between the high and low sides

of the system. The pilot section of the valve opens and

closes ports for the small capillary tubes to the main valve

to cause it to shift.

ELECTRIC SHOCK HAZARD

WARNING

Disconnect power to the unit before servicing.

Failure to follow this warning could result in

serious injury or death.

Reversing Valve in Heating Mode

TESTING THE REVERSING VALVE

SOLENOID COIL

The solenoid coil is an electromagnetic type coil mounted

on the reversing valve and is energized during the

operation of the compressor in the heating cycle.

1. Turn off high voltage electrical power to unit.

2. Unplug line voltage lead from reversing valve coil.

3. Check for electrical continuity through the coil. If you

do not have continuity replace the coil.

4. Check from each lead of coil to the copper liquid line

as it leaves the unit or the ground lug. There should

be no continuity between either of the coil leads

and ground; if there is, coil is grounded and must be

replaced.

5. If coil tests okay, reconnect the electrical leads.

6. Make sure coil has been assembled correctly.

NOTE: Do not start unit with solenoid coil removed from

valve, or do not remove coil after unit is in operation. This

will cause the coil to burn out.

CHECKING THE REVERSING VALVE

NOTE: You must have normal operating pressures before

the reversing valve can shift.

Check the operation of the valve by starting the system

and switching the operation from “Cooling” to “Heating”

and then back to “Cooling”. Do not hammer on valve.

Occasionally, the reversing valve may stick in the heating

or cooling position or in the mid-position.

When sluggish or stuck in the mid-position, part of the

discharge gas from the compressor is directed back to the

suction side, resulting in excessively high suction pressure.

ELECTRIC SHOCK HAZARD

WARNING

Unplug and/or disconnect all electrical power

to the unit before performing inspections,

maintenances or service.

Failure to do so could result in electric shock,

serious injury or death.

Sealed Refrigeration System contains refrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

HIGH PRESSURE HAZARD

Should the valve fail to shift from coooling to heating,

block the air ﬂ ow through the outdoor coil and allow the

discharge pressure to build in the system. Then switch

the system from heating to cooling.

If the valve is stuck in the heating position, block the air

ﬂ ow through the indoor coil and allow discharge pressure

to build in the system. Then switch the system from

heating to cooling.

Should the valve fail to shift in either position after

increasing the discharge pressure, replace the valve.

Dented or damaged valve body or capillary tubes can

prevent the main slide in the valve body from shifting.

If you determing this is the problem, replace the reversing

valve.

After all of the previous inspections and checks have

been made and determined correct, then perform the

“Touch Test” on the reversing valve.

8. Pressurize sealed system with a combination of R-410A

and nitrogen and check for leaks, using a suitable leak

detector. Recover refrigerant per EPA guidelines.

9. Once the sealed system is leak free, install solenoid coil

on new valve and charge the sealed system by weighing

in the proper amount and type of refrigerant as shown

on rating plate. Crimp the process tubes and solder the

ends shut. Do not leave Schrader or piercing valves in

the sealed system.

NOTE: When brazing a reversing valve into the system, it is

of extreme importance that the temperature of the valve does

not exceed 250°F at any time.

Wrap the reversing valve with a large rag saturated with

water. “Re-wet” the rag and thoroughly cool the valve after

each brazing operation of the four joints involved.

The wet rag around the reversing valve will eliminate

conduction of heat to the valve body when brazing the line

connection.

6. Protect new valve body from heat while brazing with plastic

heat sink (Thermo Trap) or wrap valve body with wet

rag.

7. Fit all lines into new valve and braze lines into new

valve.

Procedure For Changing Reversing Valve

1. Install Process Tubes. Recover refrigerant from sealed

system. PROPER HANDLING OF RECOVERED

REFRIGERANT ACCORDING TO EPA REGULATIONS

IS REQUIRED.

2. Remove solenoid coil from reversing valve. If coil is to

be reused, protect from heat while changing valve.

3. Unbraze all lines from reversing valve.

4. Clean all excess braze from all tubing so that they will

slip into ﬁ ttings on new valve.

5. Remove solenoid coil from new valve.

The use of a torch requires extreme care and proper

judgment. Follow all safety recommended precautions

and protect surrounding areas with ﬁ re proof materials.

Have a ﬁ re extinguisher readily available. Failure to follow

this notice could result in moderate to serious property

damage.

NOTICE

FIRE HAZARD

Touch Test in Heating/Cooling Cycle

The only definite indications that the slide is in the mid-

position is if all three tubes on the suction side of the valve

are hot after a few minutes of running time.

NOTE: A condition other than those illustrated above, and

on Page 44, indicate that the reversing valve is not shifting

properly. Both tubes shown as hot or cool must be the same

corresponding temperature.

Certain unit components operate at

temperatures hot enough to cause burns.

Proper safety procedures must be followed,

and proper protective clothing must be

worn.

Failure to follow these procedures could

result in minor to moderate injury.

WARNING

BURN HAZARD

The use of nitrogen requires a pressure

regulator. Follow all safety procedures and

wear protective safety clothing etc.

Failure to follow proper safety procedures

could result in serious injury or death.

WARNING

EXPLOSION HAZARD

Sealed Refrigeration System contains refrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

HIGH PRESSURE HAZARD

Locked Rotor Voltage (L.R.V.) Test

Locked rotor voltage (L.R.V.) is the actual voltage available

at the compressor under a stalled condition.

Single Phase Connections

Disconnect power from unit. Using a voltmeter, attach one

lead of the meter to the run “R” terminal on the compressor

and the other lead to the common “C” terminal of the com-

pressor. Restore power to unit.

Determine L.R.V.

Start the compressor with the volt meter attached; then stop

the unit. Attempt to restart the compressor within a couple

of seconds and immediately read the voltage on the meter.

The compressor under these conditions will not start and will

usually kick out on overload within a few seconds since the

pressures in the system will not have had time to equalize.

Voltage should be at or above minimum voltage of 197 VAC,

as speciﬁ ed on the rating plate. If less than minimum, check

for cause of inadequate power supply; i.e., incorrect wire

size, loose electrical connections, etc.

COMPRESSOR CHECKS

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation. Extreme care must be used, if it

becomes necessary to work on equipment with

power applied.

Failure to do so could result in serious injury or

death.

Heat generated within the compressor shell, usually due

to recycling of the motor, is slow to dissipate. It may take

anywhere from a few minutes to several hours for the

overload to reset.

Checking the Overloads

External Overloads

With power off, remove the leads from compressor

terminals. If the compressor is hot, allow the overload

to cool before starting check. Using an ohmmeter, test

continuity across the terminals of the external overload.

If you do not have continuity; this indicates that the

overload is open and must be replaced.

Interrnal Overloads

Some model compressors are equipped with an internal

overload. The overload is embedded in the motor

windings to sense the winding temperature and/or current

draw. The overload is connected in series with the

common motor terminal.

Should the internal temperature and/or current draw

become excessive, the contacts in the overload will

open, turning off the compressor. The overload will

automatically reset, but may require several hours before

the heat is dissipated.

Checking the Internal Overload

1. With no power to unit, remove the leads from the

compressor terminals.

2. Using an ohmmeter, test continuity between terminals

C-S and C-R. If no continuity, the compressor overload is

open and the compressor must be replaced.

Amperage (L.R.A.) Test

The running amperage of the compressor is the most

important of these readings. A running amperage higher

than that indicated in the performance data indicates that a

problem exists mechanically or electrically.

Single Phase Running and L.R.A. Test

NOTE: Consult the speciﬁ cation and performance section

for running amperage. The L.R.A. can also be found on the

rating plate.

Select the proper amperage scale and clamp the meter

probe around the wire to the “C” terminal of the compressor.

Turn on the unit and read the running amperage on the

meter. If the compressor does not start, the reading will

indicate the locked rotor amperage (L.R.A.).

Overloads

The compressor is equipped with either an external or

internal overload which senses both motor amperage

and winding temperature. High motor temperature or

amperage heats the overload causing it to open, breaking

the common circuit within the compressor.

Certain unit components operate at

temperatures hot enough to cause burns.

Proper safety procedures must be followed,

and proper protective clothing must be

worn.

Failure to follow this warning could result

in moderate to serious injury.

WARNING

BURN HAZARD

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation. Extreme care must be used, if it

becomes necessary to work on equipment

with power applied.

Failure to do so could result in serious injury or

death.

Single Phase Resistance Test

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the ohmmeter on the lowest scale (R x 1).

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retemmho eht fo sdael eht hcuot ,txeN .)”S“ ot ”C“( trats ot

from terminals common to run (“C” to “R”).

Add values “C” to “S” and “C” to “R” together and

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Resistance “S” to “R” should equal the total of “C” to “S”

and “C” to “R.”

In a single phase PSC compressor motor, the highest

ot ”S“( snoitcennoc nur eht ot trats eht morf eb lliw eulav

ht ot trats eht morf si ecnatsiser tsehgih txen ehT .)”R“

common connections (“S” to “C”). The lowest resistance

is from the run to common. (“C” to “R”) Before replacing a

compressor, check to be sure it is defective.

GROUND TEST

Use an ohmmeter set on its highest scale. Touch one

lead to the compressor body (clean point of contact as

a good connection is a must) and the other probe in turn

to each compressor terminal. If a reading is obtained the

compressor is grounded and must be replaced.

Check the complete electrical system to the compressor

and compressor internal electrical system, check to be

certain that compressor is not out on internal overload.

Complete evaluation of the system must be made

whenever you suspect the compressor is defective. If

the compressor has been operating for sometime, a

careful examination must be made to determine why the

compressor failed.

Many compressor failures are caused by the following

conditions:

1. Improper air ﬂow over the evaporator.

2. Overcharged refrigerant system causing liquid to be

returned to the compressor.

3. Restricted refrigerant system.

4. Lack of lubrication.

5. Liquid refrigerant returning to compressor causing oil

to be washed out of bearings.

6. Noncondensables such as air and moisture in

the system. Moisture is extremely destructive to a

refrigerant system.

7. Capacitor (see page 34).

CHECKING COMPRESSOR EFFICIENCY

The reason for compressor inefﬁciency is normally due

to broken or damaged suction and/or discharge valves,

reducing the ability of the compressor to pump refrigerant

gas.

This condition can be checked as follows:

1. Install a piercing valve on the suction and discharge or

liquid process tube.

2. Attach gauges to the high and low sides of the system.

3. Start the system and run a “cooling or heating perfor

mance test.” If test shows:

A. Below normal high side pressure

B. Above normal low side pressure

C. Low temperature difference across coil

The compressor valves are faulty - replace the

compressor.

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation. Extreme care must be used, if it

becomes necessary to work on equipment

with power applied.

Failure to do so could result in serious injury or

death.

Sealed Refrigeration System contains refrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

HIGH PRESSURE HAZARD

Recommended procedure for compressor

replacement

1. Be certain to perform all necessary electrical and

refrigeration tests to be sure the compressor is

actually defective before replacing.

2. Recover all refrigerant from the system though

the process tubes. PROPER HANDLING OF

RECOVERED REFRIGERANT ACCORDING TO

EPA REGULATIONS IS REQUIRED. Do not use

gauge manifold for this purpose if there has been

a burnout. You will contaminate your manifold and

hoses. Use a Schrader valve adapter and copper

tubing for burnout failures.

3. After all refrigerant has been recovered, disconnect

suction and discharge lines from the compressor and

remove compressor. Be certain to have both suction

and discharge process tubes open to atmosphere.

4. Carefully pour a small amount of oil from the suction

stub of the defective compressor into a clean

container.

9. Evacuate the system with a good vacuum pump capable

of a ﬁ nal vacuum of 200 microns or less. The system

should be evacuated through both liquid line and suction

line gauge ports. While the unit is being evacuated, seal

all openings on the defective compressor. Compressor

manufacturers will void warranties on units received not

properly sealed. Do not distort the manufacturers tube

connections.

10. Recharge the system with the correct amount of

refrigerant. The proper refrigerant charge will be

found on the unit rating plate. The use of an accurate

measuring device, such as a charging cylinder,

electronic scales or similar device is necessary.

COMPRESSOR REPLACEMENT

5. Using an acid test kit (one shot or conventional kit), test

the oil for acid content according to the instructions

with the kit.

6. If any evidence of a burnout is found, no matter how

slight, the system will need to be cleaned up following

proper procedures.

7. Install the replacement compressor.

8. Pressurize with a combination of R-410A and nitrogen

and leak test all connections with an electronic or

Halide leak detector. Recover refrigerant and repair

any leaks found.

Repeat Step 8 to insure no more leaks are present.

Unplug and/or disconnect all electrical power

to the unit before performing inspections,

maintenances or service.

Failure to do so could result in electric shock,

serious injury or death.

WARNING

RISK OF ELECTRIC SHOCK

Sealed Refrigeration System contains refrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

HIGH PRESSURE HAZARD

Extreme care, proper judgment and all safety

procedures must be followed when testing,

troubleshooting, handling or working around

unit while in operation with high temperature

components. Wear protective safety aids

such as: gloves, clothing etc.

Failure to do so could result in serious burn

injury.

WARNING

HIGH TEMPERATURES

The use of a torch requires extreme care and proper

judgment. Follow all safety recommended precautions

and protect surrounding areas with ﬁ re proof materials.

Have a ﬁ re extinguisher readily available. Failure to follow

this notice could result in moderate to serious property

damage.

NOTICE

FIRE HAZARD

The use of nitrogen requires a pressure

regulator. Follow all safety procedures and

wear protective safety clothing etc.

Failure to follow proper safety procedures

result in serious injury or death.

WARNING

EXPLOSION HAZARD

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with liquid refrigerant.

Failure to follow these procedures could

result in minor to moderate injury.

CAUTION

FREEZE HAZARD

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before service or

installation.

Failure to do so may result in personal injury,

or death.

Sealed Refrigeration System contains refrigerant

and oil under high pressure.

Proper safety procedures must be followed,

and proper protective clothing must be worn

when working with refrigerants.

Failure to follow these procedures could

result in serious injury or death.

WARNING

HIGH PRESSURE HAZARD

The use of nitrogen requires a pressure

regulator. Follow all safety procedures and

wear protective safety clothing etc.

Failure to follow proper safety procedures

result in serious injury or death.

WARNING

EXPLOSION HAZARD

Recover all refrigerant and oil from the system.

Remove compressor, capillary tube and ﬁlter drier

from the system.

Flush evaporator condenser and all connecting

tubing with dry nitrogen or equivalent. Use approved

ﬂushing agent to remove all contamination from

system. Inspect suction and discharge line for

carbon deposits. Remove and clean if necessary.

Ensure all acid is neutralized.

Reassemble the system, including new drier strainer

and capillary tube.

Proceed with step 8-10 on previous page.

SPECIAL PROCEDURE IN THE CASE OF MOTOR

COMPRESSOR BURNOUT

Basically, troubleshooting and servicing rotary compres-

sors is the same as on the reciprocating compressor with

only one main exception:

NEVER, under any circumstances, liquid charge a rotary-

compressor through the LOW side. Doing so would cause

permanent damage to the new compressor.

ROTARY AND SCROLL COMPRESSOR SPECIAL

TROUBLESHOOTING AND SERVICE

ROUTINE MAINTENANCE

COILS AND BASE PAN

The indoor coil (evaporator coil), the outdoor coil

(condenser coil) and base pan should be inspected

periodically (yearly or bi-yearly) and cleaned of all

debris (lint, dirt, leaves, paper, etc.). Clean the coils

and base pan with a soft brush and compressed air

or vacuum. If using a pressure washer, be careful

not to bend the aluminium ﬁ n pack. Use a sweeping

up and down motion in the direction of the vertical

aluminum ﬁ n pack when pressure cleaning coils.

Cover all electrical components to protect them from

water or spray. Allow the unit to dry thoroughly before

reinstalling it in the sleeve.

BLOWER WHEEL / HOUSING / CONDENSER FAN /

SHROUD

Inspect the indoor blower and its housing, evaporator

blade, condenser fan blade and condenser shroud

periodically (yearly or bi-yearly) and clean of all debris

(lint, dirt, mold, fungus, etc.). Clean the blower housing

area and blower wheel with an antibacterial / antifungal

cleaner. Use a biodegradable cleaning agent and

degreaser on condenser fan and condenser shroud.

Use warm or cold water when rinsing these items.

Allow all items to dry thoroughly before reinstalling

them.

ELECTRONIC / ELECTRICAL / MECHANICAL

Periodically (at least yearly or bi-yearly): inspect

all control components: electronic, electrical and

mechanical, as well as the power supply. Use proper

testing instruments (voltmeter, ohmmeter, ammeter,

wattmeter, etc.) to perform electrical tests. Use an air

conditioning or refrigeration thermometer to check

room, outdoor and coil operating temperatures.

BLOWER/FAN MOTOR

The motor is permanently lubricated.

AIR FILTER

The air ﬁ lter should be inspected weekly and cleaned

if needed by vacuuming with a dust attachment or

by cleaning in the sink using warm water and a mild

dishwashing detergent. Dry the ﬁ lter thoroughly before

reinstalling. Use caution as the coil surface can be sharp.

TO REMOVE, WASH AND REPLACE FILTER

Lower front panel. Use handle on ﬁ lter to ﬂ ex ﬁ lter

up and out of retainer. Remove ﬁ lter from unit. Clean

ﬁ lter monthly or more frequently if needed. Refer to

accessories section for ﬁ lter options.

Units are to be inspected and serviced by qualiﬁ ed service

personnel only. Use proper protection on surrounding

property. Failure to follow this notice could result in

moderate or serious property damage.

NOTICE

EXCESSIVE WEIGHT HAZARD

WARNING

Use two people to lift or carry the unit, and wear

proper protective clothing.

Failure to do so may result in personal injury.

Do not use a caustic coil cleaning agent on coils or base

pan. Use a biodegradable cleaning agent and degreaser,

to prevent damage to the coil and/or base pan.

NOTICE

ELECTRIC SHOCK HAZARD

WARNING

Turn off electric power before inspections,

maintenances, or service.

Extreme care must be used, if it becomes

necessary to work on equipment with power

applied.

Failure to do so could result in serious injury

or death.

CUT/SEVER HAZARD

WARNING

Be careful with the sharp edges and corners.

Wear protective clothing and gloves, etc.

Failure to do so could result in serious injury.

NOTE: .napesabrosliocnotnegagninaelclioccitsuacaesutonoD

Use a biodegradable cleaning agent and degreaser. The use

of harsh c leaning materials may lead to deterioration o f the

NOTE: It is extremely important to insure that none of the electrical

and/or electronic parts of the unit get wet. Be sure to cover all

electrical components to protect them from water or spray.

SLEEVE / DRAIN

Inspect the sleeve and drain system periodically (at least yearly or bi-yearly) and clean of all obstructions and

debris. Clean both areas with an antibacterial and antifungal cleaner. Rinse both items thoroughly with water and

ensure that the drain outlets are operating correctly. Check the sealant around the sleeve and reseal areas as

needed.

DECORATIVE FRONT COVER

Clean the front cover when needed. Use a mild detergent. Wash and rinse with warm water. Allow it to dry

thoroughly before reinstalling it in the chassis.

The decorative front and the cabinet can be cleaned with warm water and a mild liquid detergent. Do NOT use

solvents or hydrocarbon based cleaners such as acetone, naphtha, gasoline, benzene, etc.

Use a damp (not wet) cloth when cleaning the control area to prevent water from entering the unit, and possibly

damaging the electronic control.

CLEARANCES

Inspect the surrounding area (inside and outside) to ensure that the unit’s clearances have not been compromised or

altered.

ROUTINE MAINTENANCE (Continued)

Do not drill holes in the bottom of the drain pan or the

underside of the unit. Not following this notice could

result in damage to the unit or condensate water leaking

inappropriately which could cause water damage to

surrounding property.

NOTICE

Compressor

Fresh Air Vent

Evaporator Coil

Electronic Control

Board

Control Key Pad

Support Bar

Blower Wheel

Air Intake From

Sides and Bottom

Control Key Pad

(User Interface) Chassis Pull

Out Handle

Base Pan

Fan Blade

Fan/Blower Motor

Air Intake Vents

Sleeve

Condenser Coil

Discharge Air

Outdoor Grille

Accumulator

Reversing Valve

ROUTINE MAINTENANCE (Continued)

Standard Filter Cleaning Installation Instructions

STEP 1.

FILTER

GRIP

STEP 3. Swing the front frame open. Clean the front frame by washing

STEP 2.

NOTE:

HANDLE

FILTER

GRIP

TOP TAB

FRONT

FRAME WITH

STANDARD

MESH FILTER

Figure 1 Figure 3

Figure 4

Figure 2

STEP 4.

NOTE:

the tab in the frame stops the handle from sliding in, sl

ide the

STEP 5.

the inside of the front door.

filter halfway up, tilt it towards the front of you, then gently slide

it up fully. Do not force the handle into the frame.

Remove the filter by grabbing it from its handle, lifting it up and swinging

it out.

 Ensure that the circuit breaker(s) or fuse(s) and supply circuit wire

size have been sized correctly. If the unit was supplied with a power

supply cord, insure that it is stored properly.

 Ensure that the entire installation is in compliance with all applicable

national and local codes and ordinances having jurisdiction.

 Secure components and accessories, such as a decorative front

cover.

 Start the unit and check for proper operation of all components in

each mode of operation.

 Instruct the owner or operator of the units operation, and the

manufacturer's Routine Maintenance.

NOTE: A log for recording the dates of maintenance and/or service is

recommended.

 Present the owner or operator of the equipment with the name,

address and telephone number of the Authorized Friedrich Warranty

Service Company in the area for future reference if necessary.

NOTE: This is a warm weather appliance

The air conditioner is designed to cool in warm weather when the outside

temperature is above 60° F (15.6° C) and below 115° F (46.1° C), so it won't

cool a room if it is already cool outside. If you want to cool a room in the

spring or fall, select the FAN ONLY mode and set the Fresh Air/Exhaust

air control to Fresh Air. This will bring in a supply of cooler outside air.

Condensation is normal

Air conditioners actually pump the heat and humidity from your room to the

outside. Humidity becomes water, and your air conditioner will use most of

the water to keep the outside coil cool. If there is excessive humidity, there

may be excess water that will drip outside. This is normal operation.

Frosting

This usually occurs because of insufﬁ cient airﬂ ow across the coils, a dirty

ﬁ lter, cool damp weather, or all of these. Set the SYSTEM mode to FAN

ONLY and the frost will disappear. Setting the thermostat a little warmer

will probably prevent the frosting from recurring.

Noises

All air conditioners make some noise. Friedrich units are designed to operate

as quietly as possible. An air conditioner mounted in a wall is quieter than

one mounted in a window. It is important to ensure that the chassis seal

gasket is properly installed (refer to installation instructions).

Heat pumps operate differently

If your unit is a "Y", or heat pump model, there are some things that you

will want to be aware of. Some functions of a heat pump differ from your

unit when it is used for heating:

It is normal for ice to form on the outdoor coil of the heat pump. 1.

Moisture in the outside air, passing over the coil when very cold,

will form ice.

If the outdoor temperature drops below 37° F (3° C), your heat 2.

pump will automatically turn on the electric resistance heat. When

the temperature rises to 40° F (4° C), the compressor will resume

the heat pump operation. If your unit is a 115 volt model (YS10),

it is designed for use in warmer climates and does not have an

electrical heat feature, and will not provide adequate heat below

37° F (2.8° C).

After Maintenance/Repair

Start-up Checklist and Notes

 Inspect and ensure that all components and accessories have been

installed properly and that they have not been damaged during the

installation progress.

 Check the condensate water drain(s) to ensure that they are adequate

for the removal of condensate water, and that they meet the approval

of the end user.

 Ensure that all installation instructions concerning clearances around

the unit have been adhered to. Check to ensure that the unit air ﬁ lter,

indoor coil, and outdoor coil are free from any obstructions.

ROUTINE MAINTENANCE (Continued)

FRR010

1. USE HAND TOOLS WHEN INSTALLING AND

REMOVING FRONT PANEL.

DO NOT OVERTIGHTEN SCREWS.

2. DISCONNECT POWER AND FOLLOW ALL

LABELED WARNINGS WHEN FRONT PANEL

IS REMOVED.

USE HAND TOOLS

DO NOT OVER TIGHTEN

Figure

CONTROL PANEL BATTERY CHANGE

PROCEDURE

Remove the grille, by loosening four (4) captive screws (See Figure 1).

Remove one (1) screw on the battery retaining door (See Figure 2). Remove

and replace the battery (CR2450). Reinstall the battery retaining door. Align

the grille guide pins then tighten the four (4) captive screws. Before closing

the grille panel door, check the ﬁ lter. Clean or replace it as necessary.

Battery type: Lithium, 3 Volts, #CR2450

Figure 1

Figure 2

Service and Assistance

Before calling for service, please check the “Troubleshooting Tips” section

on pages 40 and 41. This may help you to ﬁ nd the answer to your problem,

avoid unnecessary service calls, and save you the cost of a service call if

the problem is not due to the product itself. If you have checked the “Basic

Troubleshooting” section and still need help, it is available as follows:

You can ﬁ nd the name of your local Authorized Service Provider by visiting

our web site at www.friedrich.com.

If you require further assistance

You can call the Customer Support Call Center at 1-800-541-6645.

Before calling, please make sure that you have the complete model and

serial number, and date of purchase of your equipment available. By

providing us with this information, we will be better able to assist you.

Our specialists are able to assist you with:

 Speciﬁ cations and Features of our equipment.

 Referrals to dealers, and distributors.

 Use and Care Information.

 Recommended maintenance procedures.

 Installation information.

 Referrals to Authorized Service Providers and Parts depots.

Available Accessories

DC-2 Drain Kit – Part No. 01900235

In some installations, excess condensate water caused by extremely humid

conditions, may result in an undesirable water drip such as on a patio or

over an entryway. MODEL DC-2 DRAIN KIT (Part No. 01900-235) can be

installed to drain excess condensation to an alternate location.

Carbon Filter Kits

The kits vary depending on the chassis size (small, medium, large). Each

kit contains three (3) ﬁ lters.

WCFS – Carbon ﬁ lter kit for small chassis models.

WCFM – Carbon ﬁ lter kit for medium chassis models.

WCFL – Carbon ﬁ lter kit for large chassis models.

Remote Wall Thermostats

RT4 – Digital wall thermostat hard wired with single speed fan.

RT5 – Digital wall thermostat hard wired with a digital display, two fan speed

selection, ﬁ lter check light, temperature limiting, status indicator light, room

temperature offset, backlight and battery backup.

Window Installation Kits (Standard in Kühl

Models without Heat)

KWIKS – For all ES and YS models.

KWIKM – For all EM and YM models.

KWIKL – For all EL and YL models.

See www.friedrich.com for additional accessories for your unit.

ROOM AIR CONDITIONER UNIT PERFORMANCE TEST DATA SHEET

JOB NAME________________________________ TECHS NAME____________________________________

DATE: _______________ MODEL:_______________ SERIAL:________________

HOW IS ALL OF THE INSTALLATION? GOOD BAD

YES NO

IS A C HAS S IS S E AL GAS K E T INTALLE D ?

IS THE FRESH/EXAUST AIR VENT OPEN?

IS A FRIEDRICH SLEEVE INSTALLED?

IS A FR IE DR IC H OUTDOOR G R ILLE INS TALLE D?

IS MAINTE NANC E B E ING PE R FOR ME D? ____ ____

____ ____

If NO is checked use back of sheet for explanation

ELECTRICAL:

LINE VOLTAGE (STATIC) --------- VOLTS

START UP VOLTAGE --------- VOLTS

AMPERAGE DRAW --------- AMPS (COOL)

AMPERAGE DRAW --------- AMPS (HEAT)

COMPRESSOR

LOCKED ROTOR AMPS --------- AMPS

AMPERAGE DRAW --------- AMPS

INDOOR TEMPERATURES:

INDOOR AMBIENT TEMPERATURE -------- F

RELATIVE HUMIDITY (RH) INDOOR -------- %

C OOL HE AT

DISCHARGE AIR TEMPERATURE (INDOOR) ---------- F --------- F

RETURN AIR TEMPERATURE (INDOOR) ---------- F --------- F

OUTDOOR TEMPERATURE:

OUTDOOR AMBIENT TEMPERATURE --------- F

RH OUTDOOR --------- %

DISCHARGE AIR TEMPERATURE (OUTDOOR) --------- F ---------- F

INTAKE AIR TEMPERATURE (OUTDOOR) --------- F ---------- F

APPLICATION USE ------------------------- ROOM (RESIDENTIAL OR COMMERCIAL)

COOLING OR HEATING AREA W ---------- X L ----------- X H ----------- = SQ/CU/FT ------------

his is a general guide. pleas e cons ult manual J or M.

This is a general guide.

Please consult manual J or M for exact load calculations.

Error

Code

Maintenance

ICON Problem Control Board's Action

1Flash

Front Panel Button Stuck For More

Than 20 Seconds

Continue to monitor for "OPEN" (Unstuck) switch. Do not process switch

input. ENSURE FRONT COVER DOES NOT DEPRESS BUTTONS

2Flash

Input Voltage Out of Specification (103

- 127 / 187 - 253

)

Stop.Open all relays until voltage is back within specs. Resume operation

3Flash

Indoor Temperature Sensor is Open or

Shorted

Set temp to 75°F in COOLING or 68°F in HEATING. Unit continues to

erate

4Flash

Indoor Coil Temperature Sensor is

en or Shorted

Control Board sets temp to 40°F. Override sensor. Unit Continues to

erate.

5Flash

Outdoor Coil Temperature Sensor is

Open or Shorted

Sets temp to 20°F. Override sensor. Continue operation. Use Elec Heat if

available for HEATING. If not available use HEAT PUMP if outdoor temp

allows.

6 Flash Outdoor Coil > (grater than) 175 F

Shut down for 5 min. Resume operation for 3 min. Continues to monitor. If

test fails 3 times, the severity is increased and the unit operation is locked

out.

7Flash

Indoor Coil < (less than) 30 F for 2

consecutive minutes

Turn compressor off. Run High Fan speed. When coil temp reachs 45°F

resume o

eration after lockout time.

8Log Only

Unit Cycles > (grater than) 9 Times per

hour Continue operation. Continue to monitor. Take no action. Log Only.

9Log Only

Unit Cycles < (less than) 3 Times per

Hour Continue operation. Continue to monitor. Take no action. Log Only.

10 Log Only Room Freeze Protection

Only used if Electric Heat is available. Run High Speed and Electric heat

until room temp reaches 46°F. Display "FRZ" during operation. Logged

Onl

11 On WallStat Problem or Connection Issue Severity 4 error is. Unit operates based on standard input mapping.

Severit

2 error o

ens all rela

s. Unit will not o

erate.

12 Flash Discharge Air > (greater than) 185 F Shutdown heat pump and electric heater. Run high fan speed until temp is

100°F. Resume operation. Third occurance in 1 hour locks unit out.

13 Flash Prerssure Limit Switch Open If unit is cooling or heat pump on,shut down compressor. Run high fan until

switch closes. Resume operation. Third occurance in 1 hour locks unit out.

14 Flash Discharge Air Temperature Sensor is

en or Shorted

Override Sensor. Set temp to 75°F. Continue to monitor. Set error code 14

ON.

15 Solid On Heat Pump Error If indoor coil temp < (Lesser than) ambient temp for 3 minutes. Unit uses

electric heat to satisf

heatin

demand.

16 Flash Temperature Beyond Operating Limits Ambient temp < (less than) 0°F and ambient temp > (greater than) 130°F.

Set error code 16 ON. When cleared return unit to normal.

17 Flash Equipment Doesn't Meet Minimum

Confi

uration Must have compressor enabled and at least 2 fan speeds

18 Flash Special Test 1 Severity Level 1 Unit shuts down. Inputs via front panel or t-stat are ignored. Qualified

Technical Service re

uired URGENT

19 Flash S

ecial Test 2 Severit

Level 2 Unit o

erates. Qualified Technical Service re

uired

20 Solid On Special Test 3 Severity Level 3 Error is Logged Only. Unit operates. Severity 3 keeps unit running.

Attention is needed

21 OFF

Onl

ecial Test 4 Severit

Level 4 Error is Lo

ed Onl

. Unit o

erates. Severit

4 kee

s unit runnin

22 OFF, Log Only Outdoor Coil Temperature < 30 F for 2

consecutive Minutes

Unit will use electric heat to satisfy heating demands until temp > 45°F.

Unit must be a Heat Pum

23 OFF, Log Only Frost Protection (for Heat Pump Only

Unit- YS10M10)

Unit will run active defrost for a minimum of 6 minutes when Heat Pump

run time is greater than 60 minutes and outdoor coil temp is 26 F or less.

24 Flash Outdoor Air Temperature Sensor is

en or Shorted Continue with normal operation. Continue to monitor sensor.

Key Sequence

Action

Enter Maintenance Menu Press SYSTEM + SCHEDULE + BACK + DISPLAY/ENTER for 6 secs or until double beep sounds()

Reset Error Codes & Error History Press

 +  for 3 secs or until double beep sounds ( )

ERROR CODES AND ALARM STATUS

Problem Possible Cause Possible Solution

Unit does not operate.

The unit is turned to the off position, Turn the unit to the on position and raise or

lower temperature setting (as appropriate) to

call for operation.

The LCDI power cord is unplugged.

Plug into a properly grounded 3 prong

receptacle. See “Electrical Rating Tables” on

pg. 6 for the proper receptacle type for your

unit.

The LCDI power cord has tripped

(Reset button has popped out).

Press and release RESET (listen for click;

Reset button latches and remains in) to resume

operation.

The circuit breaker has tripped or

the supply circuit fuse has blown.

Reset the circuit breaker, or replace the fuse as

applicable. If the problem continues, contact a

licensed electrician.

There has been a local power

failure. The unit will resume normal operation once

power has been restored.

Unit Trips Circuit Breaker or

Blows Fuses.

Other appliances are being used on

the same circuit. The unit requires a dedicated outlet circuit, not

shared with other appliances.

An extension cord is being used. Do NOT use an extension cord with this or any

other air conditioner.

The circuit breaker or time-delay

fuse is not of the proper rating.

Replace with a circuit breaker or time-delay

fuse of the proper rating. See “Electrical

Rating Tables” on pg. 6 for the proper circuit

breaker/fuse rating for your unit. If the problem

continues, contact a licensed electrician.

LCDI Power Cord Trips (Reset

Button Pops Out).

The LCDI power cord can trip

(Reset button pops out) due to

disturbances on your power supply

line.

Press and release RESET (listen for click;

Reset button latches and remains in) to resume

normal operation.

Electrical overload, overheating, or

cord pinching can trip (Reset button

pops out) the LCDI power cord.

Once the problem has been determined and

corrected, press and release RESET (listen for

click; Reset button latches and remains in) to

resume normal operation.

NOTE: A damaged power supply cord must be replaced with a new power supply cord

obtained from the product manufacturer and must not be repaired.

Unit Does Not Cool/Heat

On And Off Too Frequently.

The return/discharge air grille is

blocked.

Ensure that the return and/or discharge air

paths are not blocked by curtains, blinds,

furniture, etc.

Windows or doors to the outside are

open. Ensure that all windows and doors are closed.

The temperature is not set at a cool

enough/warm enough setting. Adjust the Temperature control to a cooler or

warmer setting as necessary.

remove obstruction.

The indoor coil or outdoor coil is

dirty or obstructed. Clean the coils, (See Routine Maintenance), or

remove obstruction.

There is excessive heat or moisture

(cooking, showers, etc.) in the room.

Be sure to use exhaust vent fans while cooking

or bathing and, if possible, try not to use heat

producing appliances during the hottest part of

the day.

The temperature of the room you

are trying to cool is extremely hot. Allow additional time for the air conditioner to

cool off a very hot room.

TROUBLESHOOTING TIPS

NOTE: To more accurately identify the problem, ﬁ rst check for current maintenance

alerts and their history.

Problem Possible Cause Possible Solution

Unit Does Not Cool/Heat

On And Off Too Frequently

(continued).

The outside temperature is below

60° F (16° C).

Do not try to operate your air conditioner in the

cooling mode when the outside temperature

is below 60° F (16° C). The unit will not cool

properly, and the unit may be damaged.

The digital control is set to fan

cycling mode.

Since the fan does not circulate the room

air continuously at this setting, the room air

does not mix as well and hot (or cold) spots

may result. Using the continuous fan setting

is recommended to obtain optimum comfort

levels.

cooling capacity to match the heat

gain of the room.

Check the cooling capacity of your unit to

ensure it is properly sized for the room in which

it is installed. Room air conditioners are not

designed to cool multiple rooms.

heating capacity to match the heat

loss of the room.

Check the heating capacity of your unit. Air

conditioners are sized to meet the cooling load,

and heater size is then selected to meet the

heating load. In extreme northern climates,

room air conditioners may not be able to be

used as a primary source of heat.

Unit Runs Too Much.

This may be due to an excessive

heat load in the room.

If there are heat producing appliances in use

in the room, or if the room is heavily occupied,

the unit will need to run longer to remove the

additional heat.

It may also be due to an improperly

sized unit.

Be sure to use exhaust vent fans while cooking

or bathing and, if possible, try not to use heat

producing appliances during the hottest part of

the day.

This may be normal for higher

your new air conditioner may result in the

unit running longer than you feel it should.

This may be more apparent, if it replaced an

compared to older models.

You may notice that the discharge

air temperature of your new air

conditioner may not seem as cold

as you may be accustomed to from

older units. This does not, however,

indicate a reduction in the cooling

capacity of the unit.

capacity rating (Btu/h) listed on the unit’s rating

TROUBLESHOOTING TIPS (Continued)

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

esuaC elbissoP melborP

Compressor

does not run

Low voltage Check voltage at compressor. 115V & 230V

units will operate at 10% voltage variance

Temperature not set cold enough or

room air thermistor inoperative Set temperature to lower than ambient position.

Test thermistor and replace if inoperative.

Compressor hums but cuts off on

overload

Hard start compressor. Direct test compressor.

If compressor starts, add starting components

Open or shorted compressor

windings Check for continuity & resistance

Open overload Test overload protector & replace if inoperative

Open capacitor Test capacitor & replace if inoperative

Inoperative system button Test for continuity in all positions. Replace if

inoperative switch or electronic board.

Broken, loose or incorrect wiring Refer to appropriate wiring diagrams to check

wiring. Correct as needed.

esuaC elbissoP melborP

Fan motor

does not run

Inoperative system button Test button & replace user interface if inoperative

Broken, loose or incorrect wiring Refer to applicable wiring diagram

Open capacitor Test capacitor & replace if inoperative

Fan speed button defective Replace user interface if inoperative

Inoperative fan motor Test fan motor & replace if inoperative (be sure

internal overload has had time to reset)

esuaC elbissoP Possible Solution

Possible Solution

melborP

Does not cool or

only cools slightly

Undersized unit Refer to industry standard sizing chart

or shorted

Indoor ambient thermistor open See alarms and replace thermistor if needed.

Dirty ﬁ launaM s’renwO ni dednemmocer sa naelC retl

Dirty or restricted condenser or

evaporator coil

Use pressure wash or biodegradable cleaning

agent to clean

Poor air circulation Adjust discharge louvers. Use high fan speed

Fresh air or exhaust air door open Close doors. Instruct customer on use of this

feature

Low capacity - undercharge Check for leak & make repair

Compressor not pumping properly Check amperage draw against nameplate. If

not conclusive, make pressure test

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

Possible Solution esuaC elbissoP melborP

Unit does not run

Fuse blown or circuit tripped

Replace fuse, reset breaker. If repeats, check

fuse or breaker size. Check for shorts in unit

wiring & components

Power cord not plugged in Plug it in

System button in “OFF” position Set correctly

Inoperative system button or open

electronic control board Test for continuity. Check alarms. Correct

as needed.

Loose or disconnected wiring

control board or other components

Check wiring & connections. Reconnect per

wiring diagram

esuaC elbissoP melborP

Evaporator coil

freezes up

Dirty ﬁ launaM s’renwO ni dednemmocer sa naelC retl

Restricted airﬂ ow

Check for dirty or obstructed coil. Use

pressure wash or biodegradable cleaning

agent to clean

Inoperative thermistor Check alarms. Replace as necessary.

Short of refrigerant De-ice coil & check for leak

Inoperative fan motor Test fan motor & replace if inoperative

Partially restricted capillary tube De-ice coil. Replace capillary tube.

esuaC elbissoP melborP

Compressor runs

continually & does

not cycle off

Excessive heat load Unit undersized. Test cooling performance &

replace with larger unit if needed. See sizing chart.

Restriction in line Check for partially iced coil & check

temperature split across coil

Refrigerant leak Find leak and repair.

Compressor relay contacts stuck Check operation of t-stat. Replace if contacts

remain closed.

Remote wall T-stat incorrectly wired Refer to appropriate wiring diagram

Thermistor shorted Replace thermistor or electronic control board

esuaC elbissoP melborP

Electronic control

board does not

turn unit off

Compressor relay contacts stuck Replace electronic control board

Temperature set at coldest point Turn to higher temp. setting to see if unit

cycles off. If not, replace control board.

Incorrect wiring Refer to appropriate wiring diagrams

Unit undersized for area to be

cooled Refer to industry standard sizing chart

Defective thermistor Replace thermistor or electronic control board

Possible Solution

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

Possible Solution esuaC elbissoP melborP

Compressor runs

for short periods

only. Cycles on

overload

Overload inoperative. Opens too

soon

Check operation of unit. Replace overload if

system operation is satisfactory

Compressor restarted before

system pressures equalized

Control’s default of 3 minutes wait delay timer

inoperative. Replace board.

Low or ﬂ uctuating voltage

Check voltage with unit operating. Check for

other appliances on circuit. Air conditioner

should be in a dedicated circuit for proper

voltage & fused separately

Incorrect wiring Refer to appropriate wiring diagram

Shorted or incorrect capacitor Test capacitor and replace if needed.

Restricted or low air flow through

condenser coil or evaporator coil

Check for proper fan speed or blocked

coils. Correct as needed.

Compressor running abnormally

hot

Check for kinked discharge line or restricted

condenser. Refrigerant overcharge. Check

amperage, connections.

esuaC elbissoP melborP

Unit does not

turn on

No power Check power supply. Check LCDI plug. Check

wire connections. Check if panel is locked.

Incorrect wiring Refer to appropriate wiring diagram

Defective thermistor Replace thermistor or electronic control board

esuaC elbissoP melborP

Noisy operation

Poorly installed Refer to Installation Manual for proper

installation

Fan blade striking chassis Reposition - adjust motor mount

Compressor vibrating

Check that compressor grommets have not

deteriorated. Check that compressor mounting

parts are not missing

Improperly mounted or loose

cabinet parts refrigerant tubes

Check assembly & parts for looseness,

rubbing & rattling pipes, etc.

esuaC elbissoP melborP

Water leaks into

the room

Evaporator drain pan overﬂ owing Clean obstructed drain trough

Condensation forming underneath

base pan

Evaporator drain pan broken or cracked.

Reseal or replace. No chassis gasket installed.

Install chassis gasket

Poor installation resulting in rain

entering the room

Check installation instructions. Reseal as

required

Condensation on discharge grille

louvers

Dirty evaporator coil. Use pressure wash

or biodegradable cleaning agent to clean.

Environmental phenomena: point supply

louvers upward. Put on high fan.

Chassis gasket not installed Install gasket, per Installation manual

Downward slope of unit is too

steep inward

Refer to installation manual for proper

installation

Possible Solution

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

esuaC elbissoP melborP

Water “spitting”

into room

Sublimation:

When unconditioned saturated,

outside air mixes with conditioned

air, condensation forms on the

cooler surfaces

Ensure that foam gaskets are installed in

between window panes & in between the

unit & the sleeve. Also, ensure that fresh

air/exhaust vents (on applicable models) are in

the closed position & are in tact

Downward pitch of installation is

too steep towards back of unit

Follow installation instructions to ensure that

downward pitch of installed unit is no less than

1/4” & no more than 3/8”

Restricted coil or dirty ﬁ lter Clean & advise customer of periodic cleaning

& maintenance needs of entire unit

esuaC elbissoP melborP

Excessive

moisture

Insufﬁ cient air circulation thru area

to be air conditioned Adjust louvers for best possible air circulation

noitisop ”revaSyenoM“ ni etarepO tinu dezisrevO

Inadequate vapor barrier in building

structure, particularly ﬂ oors Advise customer

esuaC elbissoP melborP

Unit

short cycles

Defective thermistor Replace thermistor or electronic control board

Unit oversized See sizing chart. Correct as needed.

Chassis seal gasket not sealing or

absent causting unit to short cycle

Check gasket. Reposition or replace as

needed

Restricted coil or dirty ﬁ lter Clean & advise customer of periodic cleaning

& maintenance needs of entire unit

esuaC elbissoP melborP

Prolonged off

cycles

Defective remote wall t-stat Replace t-stat

Check alarms. Replace thermistor or electronic

control board

Defective indoor ambient thermistor

or electronic control board

esuaC elbissoP melborP

Outside water

leaks

Evaporator drain pan cracked or

obstructed Repair, clean or replace as required

Water in compressor area Detach shroud from pan & coil. Clean &

remove old sealer. Reseal, reinstall & check

Obstructed condenser coil Use pressure wash or biodegradable cleaning

agent to clean

Fan blade/slinger ring improperly

positioned

Adjust fan blade to 1/2” of condenser coil ﬁ n

pack

Possible Solution

HEAT / COOL ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

Possible Solution

esuaC elbissoPmelborP

Room temperature

uneven

(Heating cycle)

Check error codes. Replace as needed.Bad indoor ambient thermistor

Set at higher fan speed.Fan speed too low

Close doors, windows, etc.Opened door, windows, etc.

Enable ATSFATSF (room air sampling feature) disabled

Possible SolutionesuaC elbissoPmelborP

Unit will not defrost

(Heat pump

only models)

Replace thermistor.Bad outdoor coil thermistor

• On heat pumps with electric heat: no action needed

• On model YSM10: do not operate below 32°F/ 0°C

• If outdoor air temp is higher than freezing, check

reversing valve, electric coil, outdoor thermistor,

refrigerant circuits, etc.

• For proper operation: correct as needed

Temperature below 32°F/ 0°C

esuaC elbissoPmelborP

Does not heat

adequately

Exhaust or fresh air door open Check if operating properly. Instruct customer on

proper use of control

Dirty ﬁlaunaM s'renwO ni dednemmocer sa naelCret

Unit undersized

Check heat rise across coil. If unit operates

efﬁ ciently, check if insulation can be added

to attic or walls. If insulation is adequate,

recommend additional unit or larger one

Outdoor coil thermistor or electronic control

board defective

Heater hi-limit control cycling on & off Check for adequate fan air across heater. Check

for open hi-limit control.

Check alarms (error codes). Replace thermistor

or electronic control board.

Shorted or open supplementary heater Do ohmmeter check.

margaid gniriw elbacilppa kcehCgniriw tcerrocnI

noitcAesuaC elbissoPmelborP

Unit cools when

heat is called for

Incorrect wiring Refer to applicable wiring diagram

Defective solenoid coil Check for continuity of coil

Reversing valve fails to shift

Block condenser coil & switch unit to cooling.

Allow pressure to build up in system, then

switch to heating. If valve fails to shift, replace

valve.

Inoperative system switch Check for continuity of system switch

noitcAesuaC elbissoPmelborP

Cooling adequate,

but heating

insufﬁ cient

Heating capillary tube partially

restricted Check for partially starved outer coil. Replace

heating capillary tube

Check valve leaking internally

Switch unit several times from heating to

cooling. Check temperature rise across

coil. Refer to speciﬁ cation sheet for correct

temperature rise

Reversing valve failing to shift

completely; bypassing hot gas

Denergize solenoid coil, raise head pressure,

energize solenoid to break loose. If valve fails

to make complete shift, replace valve.

LOW SUCTION PRESSURE HIGH SUCTION PRESSURE LOW HEAD PRESSURE HIGH HEAD PRESSURE

Low Load Conditions High Load Conditions Low Load Conditions High Load Conditions

Low Air Flow Across High Air Flow Across Refrigerant System Low Air Flow Across

Indoor Coil Indoor Coil Restriction Outdoor Coil

Refrigerant System Reversing Valve not Reversing Valve not Overcharged

Restriction Fully Seated Fully Seated

Undercharged Overcharged Undercharged Noncondensables (air)

metsyS ni

Moisture in System Defective Compressor Defective Compressor

REFRIGERANT SYSTEM DIAGNOSIS - COOLING CYCLE

HEAT PUMP ROOM AIR CONDITIONERS: TROUBLE SHOOTING TIPS

TROUBLESHOOTING CHART - HEAT PUMP

HEAT PUMP ROOM AIR CONDITIONERS: TROUBLE SHOOTING TIPS

ELECTRICAL TROUBLESHOOTING CHART - HEAT PUMP

Reversing Valve Stuck

Replace the Reversing Valve

Replace the Solenoid Coil

Is the Solenoid Coil Good?

Is Line Voltage

Present at the Solenoid

Is the Selector Switch

Set for Heat?

SYSTEM COOLS WHEN

HEATING IS DESIRED.

YES

HEAT PUMP

YES

Noncondensables (air)

in System

Overcharged

Low Airﬂ ow Across

Indoor Coil

Outdoor Ambient Too High

For Operation In Heating

Moisture in System Defective Compressor Defective Compressor

Undercharged Overcharged Undercharged

Refrigerant System

Restriction Reversing Valve not

Fully Seated

Low Airﬂ ow

Across Outdoor Coil Outdoor Ambient Too High

for Operation in Heating Refrigerant System

Restriction

Reversing Valve not

Fully Seated

REFRIGERANT SYSTEM DIAGNOSIS - HEATING CYCLE

LOW SUCTION PRESSURE HIGH SUCTION PRESSURE LOW HEAD PRESSURE HIGH HEAD PRESSURE

DISCHARGE TUBE

SUCTION TUBE to

Tube to OUTSIDE

from Compressor

Tube to INSIDE

Capillary Tube

Compressor

RIGHT Pilot

LEFT Pilot

COIL

NORMAL FUNCTION OF VALVE

VALVE

OPERATING

DISCHARGE TUBE

from Compressor

SUCTION TUBE

to Compressor

Tube to INSIDE

COIL

Tube to OUTSIDE

COIL

LEFT Pilot

Capillary Tube

RIGHT Pilot

Capillary Tube

CONDITION

     

NOTES:

* TEMPERATURE OF VALVE BODY

** WARMER THAN VALVE BODY

 1 2 3 4 5 6 POSSIBLE CAUSES CORRECTIONS

Normal Cooling Hot Cool

Cool

as (2) Hot

as (1) *TVB TVB

 

Normal Heating Hot Cool

Hot

as (1) Cool

as (2) *TVB TVB

 

MALFUNCTION OF VALVE

Valve will not

shift from cool

to heat.

Check Electrical circuit and coil .tiucric lacirtcele riapeR .lioc ot egatlov oN

.lioc ecalpeR .lioc evitcefeD

Check refrigeration charge .metsys egrahcer ,k

ael riapeR .egrahc woL

Pressure differential too high. Recheck system.

Hot Cool

Cool,

as (2) Hot,

as (1) *TVB Hot Pilot valve okay. Dirt in one bleeder hole.

Deenergize solenoid, raise head pressure,

reenergize solenoid to break dirt loose.

If unsuccessful, remove valve, wash

out. Check on air before installing. If no

movement, replace valve, add strainer to

discharge tube, mount valve horizontally.

      Piston cup leak

Stop unit. After pressures equalize, restart

with solenoid energized. If valve shifts,

reattempt with compressor running. If still

no shift, replace valve.

Valve will not

shift from cool

to heat.

Hot Cool

Cool,

as (2) Hot,

as (1) *TVB *TVB Clogged pilot tubes. Raise head pressure, operate solenoid to

free. If still no shift, replace valve.

Hot Cool

Cool,

as (2) Hot,

as (1) Hot Hot

Both ports of pilot open. (Back seat port

did not close).

Raise head pressure, operate solenoid

to free

partially clogged port. If still no shift,

replace

valve.

Warm Cool Cool,

as (2) Hot,

as (1) *TVB Warm Defective Compressor. Replace compressor

Starts to shift

but does not

complete

reversal.

Hot Warm Warm Hot *TVB Hot Not enough pressure differential at start

of stroke or not enough ﬂ ow to maintain

pressure differential.

Check unit for correct operating pressures

and charge. Raise head pressure. If no

shift, use valve with smaller port.

      evlav ecalpeR .egamad ydoB

Hot Warm Warm Hot Hot Hot Both ports of pilot open. Raise head pressure, operate solenoid. If

no shift, use valve with smaller ports.

evlav ecalpeR .egamad ydoB toH BVT* toH toH toH toH

     

Valve hung up at mid-stroke. Pumping

volume of compressor not sufﬁ cient to

maintain reversal.

Raise head pressure, operate solenoid. If

no shift, use valve with smaller ports.

Hot Hot Hot Hot Hot Hot Both ports of pilot open. Raise head pressure, operate solenoid.

If no

shift, replace valve.

Apparent

leap in heat-

ing.

Hot Cool

Hot,

as (1) Cool,

as (2) *TVB *TVB Piston needle on end of slide leaking. Operate valve several times, then recheck.

If excessive leak, replace valve.

Hot Cool

Hot,

as (1) Cool,

as (2) **WVB **WVB Pilot needle and piston needle leaking. Operate valve several times, then recheck.

If excessive leak, replace valve.

Will not shift

from heat to

cool.

Hot Cool

Hot,

as (1) Cool,

as (2) *TVB *TVB Pressure differential too high. Stop unit. Will reverse during equalization

period. Recheck system

      Clogged pilot tube. Raise head pressure, operate solenoid to

free dirt. If still no shift, replace valve.

Hot Cool

Hot,

as (1) Cool,

as (2) Hot *TVB Dirt in bleeder hole.

Raise head pressure, operate solenoid.

Remove valve and wash out. Check on air

before reinstalling, if no movement, replace

valve. Add strainer to discharge tube.

Mount valve horizontally.

Hot Cool

Hot,

as (1) Cool,

as (2) Hot *TVB Piston cup leak.

Stop unit. After pressures equalize, restart

with solenoid deenergized. If valve shifts,

reattempt with compressor running. If it

still will not reverse while running, replace

the valve.

Hot Cool

Hot,

as (1) Cool,

as (2) .evlav ecalpeR .tolip evitcefeD toH toH

Warm Cool

Warm,

as (1) Cool,

as (2) Warm *TVB Defective compressor. Replace compressor

TROUBLESHOOTING TOUCH TEST CHART: TO SERVICE REVERSING VALVES

ELECTRONIC CONTROL BOARD COMPONENTS IDENTIFICATION

Front

Sample board for Kuhl+ unit

Back

Reversing Valve

Max Speed

High Speed

Med Speed

Low Speed

T-stat Terminals

Transformer voltage

Selector Switch

115/230 Volts

Battery Compartment

User Interface

connector

Transformer

115/230 Volts

DISCHARGE

REMOTE WALL THERMOSTAT WIRING DIAGRAMS

LEGEND FOR TSTAT WIRING HARNESS

C Common Terminal

GH Call for High Fan

GL Call for Low Fan

B Reversing Valve

Y Coil for Cooling

W Call for Heat

R 24 VAC Power From Unit

RT5 - Two Speeds Fan T-Stat - Field Provided

-- -- -- Field Wiring

COOL WITH ELECTRIC HEAT

Jumper

Wire

GH GL O B Y W RC RH C

CGH GL BW

24 VAC Connections

RT5 Thermostat

Electronic Control Board

COOL W/O ELECTRIC HEAT

Jumper

Wire

GH GL O B Y W RC RH C

CGH GL BW

24 VAC Connections

RT5 Thermostat

Electronic Control Board

Jumper

Wire

GH GL O B Y W RC RH C

CGH GL BW

24 VAC Connections

Electronic Control Board

HEAT PUMP ONLY AND

HEAT PUMP WITH ELECTRIC HEAT

KUHL

ELECTRONIC CONTROL

COOL ONLY MODELS

SS08M10A, SS10M10A, SS12M10A, SS14M10A

SS12M30A, SS15M30A

SM18M30A, SM21M30A, SM24M30A

HIGH

MAX

MEDIUM

COMPRESSOR

ELECTRONIC CONTROL

L1 F4

NEUTRAL (115 V)

92170000

COMP

L2 OR N

BLACK

LOW

OLP

BLACK

COMPRESSOR

BLUE

RED

BLACK

CAPACITOR

BRACKET

RED

BLUE

TO CHASSIS

GREEN

HERM

FAN

COM

CAPACITOR

BRACKET

TO CAPACITOR

SUPPLY CORD

GREEN

ORGREEN/YELLOW

WHITE

MOTOR

BROWN

WHITE

BLACK

GREEN

TO INNERWALL/

MOTOR MOUNT

BLUE

ORANGE

RED

UI HOLDER ELECTRONICS ASY

WIRING DIAGRAM

- HEATER ELEMENT

- INSULATOR

- GROUNDED LEAD SYMBOL

- COMBINATION TERMINAL

- THERMISTER

HTR

CAP

COMPR

OLP

- HEATER LIMIT FUSE

- USER INTERFACE

- OVERLOAD PROTECTOR

- FAN MOTOR

- THERMAL FUSE

- COMPRESSOR

- CAPACITOR

MTR

L E G E N D

USERINTERFACE

SCHEMATIC

(230/208 V)

OLP

COMPRESSOR

HERM COM

CAP

FAN MTR

FAN COM

CAP

PART NO. REV.

DCHRG

AIR

SENSOR

AMBIENT

AIR SENSOR

DISPLAY

L2 or ACN

ID COIL SENSOR

OD COIL SENSOR

OD AIR SENSOR

COMP

RELAY

KUHL

ELECTRONIC CONTROL

COOL ONLY MODELS

SL28M30A, SL36M30A

WIRING DIAGRAM

SCHEMATIC

HIGH

MEDIUM

COMPRESSOR

FAN

COM

HERM

ELECTRONIC CONTROL

NEUTRAL

OLP FAN MTR

CAP

FAN COM

OLP

COMPRESSOR

HERM

CAP

COM

(230/208 V)

(115 V)

92170001

COMP

USERINTERFACE

GREEN

TO CHASSIS

CAPACITOR

BLUE

BRACKET

RED

CAPACITOR

BLACK

RED

BLUE

BLACK

COMPRESSOR

L2 OR N

OLP

WHITE

BLACK

RED

BLUE

UI HOLDER ELECTRONICS ASY

WHITE

BROWN

MOTOR

WHITE

GREEN

TO INNERWALL/

MOTOR MOUNT

ORGREEN/YELLOW

GREEN

SUPPLY CORD

BRACKET

TO CAPACITOR

BLACK

LOW

SSR

WHITE

BLUE

SOLID STATE RELAY

BLACK

REV.PART NO.

L E G E N D

- USER INTERFACE

- CAPACITOR

MTR

- COMPRESSOR

- THERMAL FUSE

- FAN MOTOR

- OVERLOAD PROTECTOR

OLP

- HEATER LIMIT FUSE

- COMBINATION TERMINAL

- GROUNDED LEAD SYMBOL

- INSULATOR

- HEATER ELEMENT

T- THERMISTER

HTR

COMPR

CAP

L2 or ACN

ID COIL SENSOR

OD COIL SENSOR

OD AIR SENSOR

RELAY

COMP

RELAY

AMBIENT

AIR SENSOR

DCHRG

AIR

SENSOR

DISPLAY

RELAY

KUHL+

ELECTRONIC CONTROL

COOL WITH ELECTRIC HEAT MODELS

ES12M33A, ES15M33A

EM18M34A, EM24M34A

BLACK

ORANGE

UI HOLDER ELECTRONICS ASY

BLACK

BLUE

HEATER

BLACK

COMPRESSOR

OLP

BLUE

RED

BLACK

RED

BRACKET

CAPACITOR

BLUE

TO CHASSIS

GREEN

ORGREEN/YELLOW

BRACKET

TO CAPACITOR

GREEN

SUPPLY CORD

USERINTERFACE

OLP FAN MTR

MOTOR MOUNT

TO INNERWALL/

GREEN

BROWN

WHITE

CAPACITOR

COM

WHITE

MOTOR

FAN COM

WHITE

RED

ORANGE

ELECTRIC HEAT

HIGH

ELECTRIC HEAT

MEDIUM

SCHEMATIC

L2 OR N

EH2

COMP

ELECTRONIC CONTROL

EH1 HTR TF

COMPRESSOR

OLP

CAP

COMPRESSOR

HERM COM

CAP

LOW

(230/208 V)

PART NO. REV.

92170002

HERM

FAN

WIRING DIAGRAM

RED

T- THERMISTER

- INSULATOR

HTR - HEATER ELEMENT

- GROUNDED LEAD SYMBOL

CAP

- COMBINATION TERMINAL

COMPR - COMPRESSOR

MTR

- CAPACITOR

- USER INTERFACEUI

- OVERLOAD PROTECTOR

OLP

- FAN MOTOR

- THERMAL FUSE

L E G E N D

- HEATER LIMIT FUSE

RELAY

FAN 4

RELAY

FAN 3

RELAY

FAN 2

RELAY

FAN 1

RELAY

HEAT

RELAY

HEAT

RELAY

COMP

RELAY

OD AIR SENSOR

OD COIL SENSOR

ID COIL SENSOR

L2 or ACN

DCHRG

AIR

SENSOR

DISPLAY

AMBIENT

AIR SENSOR

KUHL+

ELECTRONIC CONTROL

COOL WITH ELECTRIC HEAT MODEL

EL36M35A



HIGH

L2 (230/208 V)

NE UTR AL

COMP

ELECTRIC HEAT

EH1

ME DIU M

LOW

ELECTRIC HEAT

COMPRESSOR



(115 V)

WIRING DIAGRAM

UI HOLDER ELECTRONICS ASY

BLACK

BLUE

RED

ORANGE

HE ATER

BLACK

RED

BLUE

COMPRESSOR

BLACK

SOLID STATE RELAY

WHITE

BLUE

BLACK

CAPACITOR

COM

HERM

FAN

RED

CAPACITOR

BRACKET

TO CHASSIS

BLUE

GREEN

MOT OR MOUNT

TO INNER WALL/

GREEN

BROWN

WHITE WHITE

WHITE

BLACK

GREEN

OR GREEN/YELLOW

TO CAPACITOR

BRACKET

SUPPLY CORD

OLP

SSR

SCHEMATIC

USER INTERFACE

FAN MTR

FAN COM

CAP

COMPRESSOR

HERM COM

CAP

OLP

HL TF

HTR

- C AP AC ITOR - THE R MIS T E R

OLP

- FAN MOTOR







CAP

MTR

C OMPR - C OMP R E S S OR

- HE AT E R LIMIT FUS E

- THE R MAL F USE

- US E R INTE R FAC E

- OV E R LOAD PR OT E C T OR

- HEATER ELEMENT

- INS ULAT O R

- COMBINATION TER MINAL

- GR OUNDED LEAD SYMBOL

HTR

L E G E N D

REV.

PART NO.

92170007

MOTOR

SOLID STATE RELAY







SSR

RED

BLUE

BLACK

L2 or ACN

IN DOO R CO IL S E NS OR

OUTDOOR COIL SENS OR

OUTDOOR AIR SE NS OR

RELAY

FAN 4

RELAY

FAN 3

RELAY

FAN 2

RELAY

FAN 1

RELAY

HEAT

RELAY

HE AT

RELAY

COMP

RELAY

AMBIENT

AIR S E NS OR

DS C HR G

AIR

SENSOR

DIS P LAY

KUHL+

ELECTRONIC CONTROL

HEAT PUMP ONLY MODEL

YS10M10A

SCHEMATIC

MEDIUM

HIGH

LOW

COMPRESSOR

ELECTRONIC CONTROL

L1 F3

NEUTRAL

(230/208 V)

(115 V)

92170003

COMP

USERINTERFACE

L2 OR N

REVERSE CYCLE RV

FAN

RED

BLACK

ORANGE

BLACK

HERM

WIRING DIAGRAM

WHITE SUPPLY CORD

TO CAPACITOR

BRACKET

WHITE WHITE

GREEN

ORGREEN/YELLOW

MOTOR

BROWN

TO INNERWALL/

MOTOR MOUNT

GREEN

TO CHASSIS

BLUE

BRACKET

CAPACITOR

RED

COM

CAPACITOR

GREEN

BLACK

OLP

BLACK

RED

BLUE

COMPRESSOR

UI HOLDER ELECTRONICS ASY

BLUE

COIL, SOLENOID

BLACK

CAP

COM

HERM

COMPRESSOR

OLP

CAP

COM

FAN

FAN MTR

OLP

REV.PART NO.

L E G E N D

- CAPACITOR

CAP

- HEATER LIMIT FUSE

- THERMAL FUSE

- USER INTERFACE

- FAN MOTOR

- COMPRESSOR

- OVERLOAD PROTECTOR

COMPR

OLP

MTR

- COMBINATION TERMINAL

- THERMISTER

- GROUNDED LEAD SYMBOL

HTR - HEATER ELEMENT

- INSULATOR

- REVERSING VALVE

HEAT

RELAY

HEAT

RELAY

COMP

RELAY

OD AIR SENSOR

OD COIL SENSOR

ID COIL SENSOR

L2 or ACN

AMBIENT

AIR SENSOR

DCHRG

AIR

SENSOR

DISPLAY

RELAY

KUHL+

ELECTRONIC CONTROL

HEAT PUMP WITH ELECTRIC HEAT MODELS

YS12M33A, YM18M34A

SCHEMATIC

92170004

ELECTRIC HEAT

COMPRESSOR

MEDIUM

HIGH

LOW

REVERSING CYCLE R

ELECTRONIC CONTROL

EH1

L1 F3

HTR

EH2

USERINTERFACE

COMP

COMPRESSOR

BLACK

OLP

BLUE

RED

BLACK

COIL, SOLENOID

BLUE

UI HOLDER ELECTRONICS ASY

BLUE

BROWN

MOTOR

BLACK

ORANGE

BLACK

CAPACITOR

GREEN

TO CHASSIS

WHITE

BRACKET

MOTOR MOUNT

TO INNERWALL/

GREEN

CAPACITOR

COM

HERM

RED

BLUE

RED

BRACKET

WHITE

GREEN

WHITE

ORGREEN/YELLOW

TO CAPACITOR

SUPPLY CORD

FAN

BLACK

WIRING DIAGRAM

RED

ORANGE

HEATER

(230/208 V)

NEUTRAL (115 V)

CAP

COM

HERM

COMPRESSOR

OLP

OLP FAN MTR

FAN COM

CAP

REV.PART NO.

L E G E N D

- OVERLOAD PROTECTOR

- COMPRESSOR

OLP

COMPR

MTR - FAN MOTOR

- USER INTERFACE

- THERMAL FUSE

CAP - CAPACITOR

- HEATER LIMIT FUSE

- REVERSING VALVE

- INSULATOR

- HEATER ELEMENTHTR

- THERMISTER

- GROUNDED LEAD SYMBOL

- COMBINATION TERMINAL

RELAY

FAN 4

RELAY

FAN 3

RELAY

FAN 2

RELAY

FAN 1

RELAY

HEAT

RELAY

HEAT

RELAY

COMP

RELAY

L2 or ACN

ID COIL SENSOR

OD COIL SENSOR

OD AIR SENSOR

AMBIENT

AIR SENSOR

DCHRG

AIR

SENSOR

DISPLAY

KUHL+

ELECTRONIC CONTROL

HEAT PUMP WITH ELECTRIC HEAT MODEL

YL24M35A

OXXOO

OOO

HI FAN OOXOOO

OOOOX

MED FAN

LOW FAN OX

OXOO

HI HEAT (HP)

MED HEAT (HP)

LOW HEAT (HP) XO

OFF

HI COOL

MED COOL

SWITCH POSITION

HI HEAT (EH)

MED HEAT (EH)

LOW HEAT (EH)

654

CIRCUIT

XOOO

OOOO

LOW COOL

HIGH

L2 (230/208 V)

NEUTRAL

COMP

ELECTRIC HEAT

EH1

MEDIUM

LOW

ELECTRIC HEAT

COMPRESSOR

REVERSING CYCLE

ELECTRONIC CONTROL

(115 V)

WIRING DIAGRAM

UI HOLDER ELECTRONICS ASY

BLACK

BLUE

RED

ORANGE

HEATER

BLACK

RED

BLUE

COMPRESSOR

BLACK

SOLID STATE RELAY

WHITE

YELLOW

BLACK

CAPACITOR

COM

HERM

FAN

RED

CAPACITOR

BRACKET

TO CHASSIS

BLUE

GREEN

MOTOR MOUNT

TO INNERWALL/

GREEN

BROWN

WHITE WHITE WHITE

BLACK

GREEN

ORGREEN/YELLOW

TO CAPACITOR

BRACKET

SUPPLY CORD

OLP

SSR

SCHEMATIC

USERINTERFACE

FAN MTR

FAN COM

CAP

COMPRESSOR

HERM COM

CAP

OLP

HL TF

HTR

- CAPACITOR - THERMISTER

OLP

- FAN MOTOR

CAP

MTR

COMPR - COMPRESSOR

- HEATER LIMIT FUSE

- THERMAL FUSE

- USER INTERFACE

- OVERLOAD PROTECTOR

- HEATER ELEMENT

- INSULATOR

- COMBINATION TERMINAL

- GROUNDED LEAD SYMBOL

HTR

L E G E N D

O = OPEN

X = CLOSED

SWITCH LOGIC

REV.

PART NO.

92170008

MOTOR

SOLID STATE RELAY

SSR

RED

BLUE

BLACK

L2 or ACN

INDOOR COIL SENSOR

OUTDOOR COIL SENSOR

OUTDOOR AIR SENSOR

RELAY

FAN 4

RELAY

FAN 3

RELAY

FAN 2

RELAY

FAN 1

RELAY

HEAT

RELAY

HEAT

RELAY

COMP

RELAY

AMBIENT

AIR SENSOR

DSCHRG

AIR

SENSOR

DISPLAY

THERMISTORS’ RESISTANCE VALUES

(This Table Applies to All Thermistors)

TEMP

INDOOR AIR SENSOR

RESISTENCE (K Ohms)

RESISTANCE

TOLERANCE %

F MIN CENTR MAX MIN MAX

-25 210.889 225.548 240.224 6.50 6.51

-20 178.952 190.889 202.825 6.25 6.25

-15 151.591 161.325 171.059 6.03 6.03

-10 128.434 136.363 144.292 5.81 5.81

-5 108.886 115.340 121.794 5.60 5.60

0 92.411 97.662 102.912 5.38 5.38

5 78.541 82.812 87.083 5.16 5.16

10 66.866 70.339 73.812 4.94 4.94

15 57.039 59.864 62.688 4.72 4.72

20 48.763 51.060 53.357 4.50 4.50

25 41.786 43.654 45.523 4.28 4.28

30 35.896 37.415 38.934 4.06 4.06

31 34.832 36.290 37.747 4.02 4.02

32 33.803 35.202 36.601 3.97 3.97

33 32.808 34.150 35.492 3.93 3.93

34 31.846 33.133 34.421 3.89 3.89

35 30.916 32.151 33.386 3.84 3.84

36 30.016 31.200 32.385 3.80 3.80

37 29.144 30.281 31.418 3.75 3.75

38 28.319 29.425 30.534 3.76 3.77

39 27.486 28.532 29.579 3.67 3.67

40 26.697 27.701 28.704 3.62 3.62

45 23.116 23.931 24.745 3.40 3.40

50 20.071 20.731 21.391 3.18 3.18

55 17.474 18.008 18.542 2.96 2.96

60 15.253 15.684 16.115 2.75 2.75

65 13.351 13.697 14.043 2.53 2.53

66 13.004 13.335 13.666 2.48 2.48

67 12.668 12.984 13.301 2.44 2.44

68 12.341 12.644 12.947 2.39 2.39

69 12.024 12.313 12.603 2.35 2.35

70 11.716 11.993 12.269 2.31 2.31

71 11.418 11.682 11.946 2.26 2.26

72 11.128 11.380 11.633 2.22 2.22

73 10.846 11.088 11.329 2.18 2.18

74 10.574 10.804 11.034 2.13 2.13

75 10.308 10.528 10.748 2.09 2.09

76 10.051 10.260 10.469 2.04 2.04

77 9.800 10.000 10.200 2.00 2.00

78 9.550 9.748 9.945 2.03 2.03

79 9.306 9.503 9.699 2.07 2.07

80 9.070 9.265 9.459 2.10 2.10

81 8.841 9.033 9.226 2.13 2.13

82 8.618 8.809 9.000 2.17 2.17

83 8.402 8.591 8.780 2.20 2.20

84 8.192 8.379 8.566 2.23 2.23

85 7.987 8.172 8.358 2.27 2.27

86 7.789 7.972 8.155 2.30 2.30

87 7.596 7.778 7.959 2.33 2.33

88 7.409 7.589 7.768 2.37 2.37

89 7.227 7.405 7.583 2.40 2.40

90 7.050 7.226 7.402 2.43 2.43

91 6.878 7.052 7.226 2.47 2.47

92 6.711 6.883 7.055 2.50 2.50

93 6.548 6.718 6.889 2.53 2.53

94 6.390 6.558 6.727 2.57 2.57

95 6.237 6.403 6.569 2.60 2.60

96 6.087 6.252 6.417 2.63 2.63

97 5.942 6.105 6.268 2.67 2.67

98 5.800 5.961 6.122 2.70 2.70

99 5.663 5.822 5.981 2.73 2.73

100 5.529 5.686 5.844 2.77 2.77

105 4.912 5.060 5.208 2.93 2.93

110 4.371 4.511 4.651 3.10 3.10

115 3.898 4.030 4.161 3.27 3.27

120 3.482 3.606 3.730 3.43 3.43

Replacement Remote Control Configuration Instructions

For Use with Kühl (cool only models) and Kühl + (cool & heat models)

Contents:

• Remote Control with Holder

• (2) AAA-batteries

• Instruction Sheet

ATTENTION! – You May Need to Configure The Replacement Remote Control

Please read instructions completely before attempting configuration of the Remote Control. Failure to

do so could result in the Remote Control not being able to operate the Air Conditioning Unit properly.

Step 1. A. Locate the Model # of your Air Conditioner.

B. Identify the prefix (First 2 Letters) of your unit’s model #.

C. Look at the chart below and in it, find the prefix of your AC unit’s model #.

D. Note the Option # Code (OPT#) next to it and the required action. The unit’s

display is supposed to show this OPT# Code.

Model Prefix Option Code Required Action

SS, SM OPT 1 None –

Remote Control configured for use with air conditioner

SL OPT 2 Perform Steps 2 - 5

YS, YM, YL, ES, EM, EL OPT 3 Perform Steps 2 - 5

Step 2. Point the Remote Control at Air Conditioning Unit and then press the Remote Control’s

POWER

Key once to illuminate the Air Conditioning Unit’s display.

Step 3. Once the display on the Air Conditioning Unit is illuminated, check the Option Code

number (OPT#) shown in the display and ensure it matches the OPT# code for your unit

as per the chart above.

Air Conditioner Unit’s Display

(see example below Fig 1)

OPT1

OPT2

OPT3 Displayed example

ure 1

Kühl Remote Control

Step 4 Checking the Remote Control’s OPT # Code

With the Remote Control’s display illuminated, press and hold the Remote Control’s

SCHEDULE and the FAN SPEED Keys simultaneously for approximately 6 seconds until

the Remote Control displays its current OPT# Code.

If the OPT# Code is different than the AC Unit’s OPT# Code see instructions below:

Remote Control Remote Control’s OPT# Code

(see example below Fig 2)

Using the Remote Control’s S Increase

or d Decrease Keys, change the OPT# Code

displayed on the Remote Control to match the OPT # Code shown on the Air

Conditioning Unit’s display

(see examples below)

Air Conditioning Unit Display Remote Control Display

Step 5. To save the setting in the Remote Control, press and hold the Remote Control SCHEDULE

and FAN SPEED Key simultaneously for approximately 6 seconds until the displayed

configuration number on the Remote Control flashes.

The Remote Control is now configured to work with the air conditioner.

Figure 2

Kühl User Interface Service Kit

Replacement Instructions

For Use with Kühl (cool only models) and Kühl + (cool and heat models)

ATTENTION! - Please read these instructions completely before attempting replacement.

Always unplug the power supply from the power supply receptacle.

Contents:

• User Interface (UI)

• Ribbon Cable

• 2 – Mounting screws for UI

• Instruction Sheet

Step 1. Disconnect ribbon cable by pulling straight out

Step 2. Remove 2 –mounting screws securing UI and disconnect ribbon cable

Step 3. Remove UI and ribbon cable from handle assembly

Step 4. Install new UI using the 2-screws, route new ribbon cable and reattach ribbon cable to UI

and Main control board

Step 5. Verify control operation

Mounting screws

Ribbon cable connection

INSTRUCTIONS FOR USING COOLING LOAD ESTIMATE

FORM FOR ROOM AIR CONDITIONERS

(AHAM PUB. NO. RAC-1)

A. This cooling load estimate form is suitable for estimating the cooling load for comfort air conditioning installations

which do not require speciﬁ c conditions of inside temperature and humidity.

B. The form is based on an outside design temperature of 95°F dry bulb and 75°F wet bulb. It can be used for areas

in the continental United States having other outside design temperatures by applying a correction factor for the

particular locality as determined from the map.

C. The form includes “day” factors for calculating cooling loads in rooms where daytime comfort is desired (such as

living rooms, ofﬁ ces, etc.)

D. The numbers of the following paragraphs refer to the corresponding numbered item on the form:

1. Multiply the square feet of window area for each exposure by the applicable factor. The window area is the

area of the wall opening in which the window is installed. For windows shaded by inside shades or venetian

blinds, use the factor for “Inside Shades.” For windows shaded by outside awnings or by both outside aw-

nings and inside shades (or venetian blinds), use the factor for “Outside Awnings.” “Single Glass” includes

all types of single thickness windows, and “Double Glass” includes sealed airspace types, storm windows,

and glass block. Only one number should be entered in the right hand column for Item 1, and this number

should represent only the exposure with the largest load.

2. Multiply the total square feet of all windows in the room by the applicable factor.

3a. Multiply the total length (linear feet) of all walls exposed to the outside by the applicable factor. Doors should

be considered as being part of the wall. Outside walls facing due north should be calculated separately from

outside walls facing other directions. Walls which are permanently shaded by adjacent structures should be

considered “North Exposure.” Do not consider trees and shrubbery as providing permanent shading. An

uninsulated frame wall or a masonry wall 8 inches or less in thickness is considered “Light Construction.” An

insulated wall or masonry wall over 8 inches in thickness is considered “Heavy Construction.”

3b. Multiply the total length (linear feet) of all inside walls between the space to be conditioned and any uncondi-

tioned spaces by the given factor. Do not include inside walls which separate other air conditioned rooms.

4. Multiply the total square feet of roof or ceiling area by the factor given for the type of construction most nearly

describing the particular application (use one line only.)

5. Multiply the total square feet of ﬂ oor area by the factor given. Disregard this item if the ﬂ oor is directly on the

ground or over a basement.

6. Multiply the number of people who normally occupy the space to be air conditioned by the factor given. Use

a minimum of 2 people.

7. Determine the total number of watts for light and electrical equipment, except the air conditioner itself, that

will be in use when the room air conditioning is operating. Multiply the total wattage by the factor given.

8. Multiply the total width (linear feet) of any doors or arches which are continually open to an unconditioned

space by the applicable factor.

NOTE: Where the width of the doors or arches is more than 5 feet, the actual load may exceed the calculated

value. In such cases, both adjoining rooms should be considered as a single large room, and the room air

conditioner unit or units should be selected according to a calculation made on this new basis.

9. Total the loads estimated for the foregoing 8 items.

10. Multiply the subtotal obtained in item 9 by the proper correction factor, selected from the map, for the particular

locality. The result is the total estimated design cooling load in BTU per hour.

E. For best results, a room air conditioner unit or units having a cooling capacity rating (determined in accordance

with the NEMA Standards Publication for Room Air Conditioners, CN 1-1960) as close as possible to the estimated

load should be selected. In general, a greatly oversized unit which would operate intermittently will be much less

satisfactory than one which is slightly undersized and which would operate more nearly continuously.

F. Intermittent loads such as kitchen and laundry equipment are not included in this form.

COOLING LOAD ESTIMATE FORM

HEAT GAIN FROM

1. WINDOWS: Heat gain from the sun.

Northeast

East

Southeast

South

Southwest

West

Northwest

North

2. WINDOWS: Heat by conduction

(Total of all windows.)

Single glass

Double glass or glass block

3. WALLS: (Based on linear feet of wall)

a. Outside walls

North Exposure

Other than North exposure

b. Inside Walls (between conditioned and

unconditioned spaces only.)

4. ROOF OR CEILING: (Use one only)

a. Roof, uninsulated

b. Roof, 1 inch or more insulation

c. Ceiling, occupied space above

d. Ceiling, insulated, with attic space above

e. Ceiling, uninsulated, with attic space above

5. Floor: (Disregard if ﬂ oor is directly on ground or

over a basement.

6. NUMBER OF PEOPLE

7. LIGHTS AND ELECTRICAL EQUIPMENT IN USE

8. DOORS AND ARCHES CONTINUOUSLY

OPENED TO UNCONDITIONED SPACE: (TOTAL

LINEAR FEET OF WIDTH.)

9. SUBTOTAL

10. TOTAL COOLING LOAD (BTU per hour to be used

for selection of room air conditioner(s).)

Shades*

110

150

120

___ _sq. ft.

____sq. ft.

____ ft.

____sq. ft.

____

____watts

____ft.

*****

Inside

Shades*

Outside

Awnings*

20 ____

25 ____

20 ____

30 ____

45 ____

35 ____

0 ____

(Area

X Factor)

Use

only

the

largest

load.

Use

only

one.

____

QUANTITY BTU/Hr.

(Quantity x Factor)

600

300

*****

Light Construction

Heavy Construction

_____

* These factors are for single glass

only. For glass block, multiply the

above factors by 0.5; for double

glass or storm windows, multiply the

above factors by 0.8.

FACTORS

DAY

____ Total in Item 9 X ____ (Factor from Map) = ____

Following is an example using the heat load form:

A space to be conditioned is part of a house geographically

located in an area where the lowest outdoor ambient winter

temperature is 40°F. The calculated heat loss is 184 BTU/

Hr./°F.

Subtract 40°F (lowest outdoor ambient temperature for the

geographical location) from 70°F (inside design temperature

of the unit) for a difference of 30°F. Multiply 184 by 30 for a

5500 BTU/Hr. total heat loss for the calculated space.

On the graph, plot the base point (70°) and a point on the

40°F line where it intersects with the 5500 BTU/Hr. line on

the left scale. Draw a straight line from the base point 70

through the point plotted at 40°F. This is the total heat loss

line.

Knowing that we have a 5500 BTU/Hr. heat loss, and

we expect that our heat pump will maintain a 70°F inside

temperature at 40°F outdoor ambient, we plot the selected

unit capacity BTU/Hr. of the unit between 35° and 60° on the

graph and draw a straight line between these points. Where

the total heat loss line and the unit capacity line intersect,

read down to the outdoor ambient temperature scale and

ﬁ nd that this unit will deliver the required BTU/Hr. capacity

to approximately 30°F.

The heat load form on the following page may be used by

servicing personnel to determine the heat loss of a conditioned

space and the ambient winter design temperatures in which

the unit will heat the calculated space.

The upper half of the form is for computing the heat loss of

the space to be conditioned. It is necessary only to insert

the proper measurements on the lines provided and multiply

by the given factors, then add this result for the total heat

loss in BTU/Hr./°F.

The BTU/Hr. per °F temperature difference is the 70°F

inside winter designed temperature minus the lowest outdoor

ambient winter temperature of the area where the unit is

installed. This temperature difference is used as the multiplier

when calculating the heat loss.

The graph shows the following:

Left Hand Scale Unit capacity BTU/Hr. or heat loss

BTU/Hr.

Bottom Scale Outdoor ambient temperature, base

point.

Heat Pump Model BTU/Hr. capacity heat pump will

deliver at outdoor temperatures.

Balance Point Maximum BTU/Hr. heat pump

will deliver at indicated ambient

temperature.

HEAT LOAD FORM

HEATING LOAD FORM

FRIEDRICH ROOM UNIT HEAT PUMPS

BTU/HR PER

WALLS: (Linear Feet) °F TEMP. DIFFERENCE

2” Insulation Lin. Ft. x 1.6

Average Lin. Ft. x 2.6

WINDOWS & DOORS (Area, sq. ft.)

Single Glass: Sq. Ft. x 1.13

Double Glass: Sq. Ft. x 0.61

INFILTRATION - WINDOWS & DOORS: AVG. Lin. Ft. x 1.0

Loose Lin. Ft. x 2.0

CEILING: (Area, Sq. Ft.)

Insulated (6”) Sq. Ft. x 0.07

Insulated (2”) Sq. Ft. x 0.10

Built-up Roof (2” insulated Sq. Ft. x 0.10

Built-up Roof (1/2” insulated) Sq. Ft. x 0.20

No Insulation Sq. Ft. x 0.33

FLOOR: (Area, Sq. Ft.)

Above Vented Crawl space

Insulated (1:) Sq. Ft. x 0.20

Uninsulated Sq. Ft. x 0.50

* Slab on Ground Lin. Ft. x 1.70

1” Perimeter insulation Lin. Ft. x 1.00

* Based on Linear Feet of outside wall TOTAL HEAT LOSS PER °F BTU/HR/°F

Multiply total BTU/HR/°F X 30 and plot on the graph below at 40°F. Draw a straight line from

the 70 base point thru the point plotted at 40°F. The intersection of this heat loss line with the

unit capacity line represents the winter design heating load.

Friedrich Air Conditioning Company

P.O. Box 1540

San Antonio, TX 78295

210.357.4400

www.friedrich.com

ROOM AIR CONDITIONERS

LIMITED WARRANTY

FIRST YEAR

ANY PART: If any part supplied by FRIEDRICH fails because of a defect in workmanship or material within twelve months from date of original

purchase, FRIEDRICH will repair the product at no charge, provided room air conditioner is reasonably accessible for service. Any additional

labor cost for removing inaccessible units and/or charges for mileage related to travel by a Service Agency that exceeds 25 miles one way will

be the responsibility of the owner. This remedy is expressly agreed to be the exclusive remedy within twelve months from the date of the original

purchase.

SECOND THROUGH FIFTH YEAR

SEALED REFRIGERANT SYSTEM: If the Sealed Refrigeration System (deﬁ ned for this purpose as the compressor, condenser coil, evaporator

coil, reversing valve, check valve, capillary, ﬁ lter drier, and all interconnecting tubing) supplied by FRIEDRICH in your Room Air Conditioner fails

because of a defect in workmanship or material within sixty months from date of purchase, FRIEDRICH will pay a labor allowance and parts

necessary to repair the Sealed Refrigeration System; PROVIDED FRIEDRICH will not pay the cost of diagnosis of the problem, removal, freight

charges, and transportation of the air conditioner to and from the Service Agency, and the reinstallation charges associated with repair of the

Sealed Refrigeration System. All such cost will be the sole responsibility of the owner. This remedy is expressly agreed to be the exclusive remedy

within sixty months from the date of the original purchase.

APPLICABILITY AND LIMITATIONS: This warranty is applicable only to units retained within the Fifty States of the U.S.A., District of Columbia,

and Canada. This warranty is not applicable to:

1. Air ﬁ lters or fuses.

2. Products on which the model and serial numbers have been removed.

3. Products which have defects or damage which results from improper installation, wiring, electrical current characteristics, or

maintenance; or caused by accident, misuse or abuse, ﬁ re, ﬂ ood, alterations and/or misapplication of the product and/or units

installed in a corrosive atmosphere, default or delay in performance caused by war, government restrictions or restraints, strikes,

material shortages beyond the control of FRIEDRICH, or acts of God.

OBTAINING WARRANTY PERFORMANCE: Service will be provided by the FRIEDRICH Authorized Dealer or Service Organization in your

area. They are listed in the Yellow Pages. If assistance is required in obtaining warranty performance, write to: Room Air Conditioner Service

Manager, Friedrich Air Conditioning Co., P.O. Box 1540, San Antonio, TX 78295-1540.

LIMITATIONS: THIS WARRANTY IS GIVEN IN LIEU OF ALL OTHER WARRANTIES. Anything in the warranty notwithstanding, ANY

IMPLIED WARRANTIES OF FITNESS FOR PARTICULAR PURPOSE AND/OR MERCHANTABILITY SHALL BE LIMITED TO THE DURATION

OF THIS EXPRESS WARRANTY. MANUFACTURER EXPRESSLY DISCLAIMS AND EXCLUDES ANY LIABILITY FOR CONSEQUENTIAL

OR INCIDENTAL DAMAGE FOR BREACH OF ANY EXPRESSED OR IMPLIED WARRANTY.

Performance of Friedrich’s Warranty obligation is limited to one of the following methods:

1. Repair of the unit

2. A refund to the customer for the prorated value of the unit based upon the remaining warranty period of the unit.

Providing a replacement unit of equal value3.

The method of fulﬁ llment of the warranty obligation is at the sole discretion of Friedrich Air Conditioning.

NOTE: Some states do not allow limitations on how long an implied warranty lasts, or do not allow the limitation or exclusion of consequential or

incidental damages, so the foregoing exclusions and limitations may not apply to you.

OTHER: This warranty gives you speciﬁ c legal rights, and you may also have other rights which vary from state to state.

PROOF OF PURCHASE: Owner must provide proof of purchase in order to receive any warranty related services.

All service calls for explaining the operation of this product will be the sole responsibility of the consumer.

All warranty service must be provided by an Authorized FRIEDRICH Service Agency, unless authorized by FRIEDRICH prior to repairs being

made.

(10 - 08)

FRIEDRICH AIR CONDITIONING CO.

Post Ofﬁ ce Box 1540 · San Antonio, Texas 78295-1540

4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212

(210) 357-4400 · 877-599-5665 x 846 · FAX (210) 357-4490

Email: tac@friedrich.com

www.friedrich.com

Printed in the U.S.A.

TECHNICAL SUPPORT

CONTACT INFORMATION

Kuhl-ServMan (5-10)

FRIEDRICH AIR CONDITIONING CO.

Post Ofﬁ ce Box 1540 · San Antonio, Texas 78295-1540

4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212

(210) 357-4400 · FAX (210) 357-4490

www.friedrich.com

Printed in the U.S.A.

Friedrich Kuhl R 410A Users Manual RAC Standard Chassis IO_(06 12 10)_CS3

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