Friedrich Air Conditioner Eq08M11 Users Manual Xstar_ServMan_02 21 11

XQ05M10 to the manual 8800c6a3-bee2-46a0-87cc-ea4c3810f2ad

2015-02-02

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Service Manual

R-410A Models

Room Air Conditioners

2 0 1 1

Cool Only

Cool with Electric Heat

X-Star-ServMan (1-11)

115-Volt: XQ05M10*, XQ06M10*, XQ08M10*, XQ10M10*

115-Volt: EQ08M11*

* Last character may vary.

M oney

Set Hr

Stop

Tem pera

ture

Cool

On/

Cooler Warm e

Onl

y S

peed Saver

ower

Tim e

r Ope

ation

Table Of Contents

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

Unit Identiﬁ cation ............................................................................................................................................................... 5

Performance Data ............................................................................................................................................................. 6

Chassis Speciﬁ cations ...................................................................................................................................................... 6

Installation Information/Sleeve Dimensions ...................................................................................................................... 6

Electrical Data ................................................................................................................................................................... 7

Before Operating the Unit ................................................................................................................................................. 8

For Best Cooling Performance and Energy Efﬁ ciency ...................................................................................................... 8

How to Operate the XQ ..................................................................................................................................................... 9

How to Use the XQ Remote Control ............................................................................................................................... 10

How to Operate the EQ ................................................................................................................................................... 10

Electronic Control Sequence of Operation ...................................................................................................................... 11

Functional Component Deﬁ nition .................................................................................................................................... 12

Components Testing .................................................................................................................................................. 13-16

Refrigeration Sequence of Operation ............................................................................................................................. 17

R-410A Sealed System Repair Considerations .............................................................................................................. 18

Sealed Refrigeration System Repairs ........................................................................................................................ 19-22

Compressor Checks ................................................................................................................................................... 23-24

Compressor Replacement .......................................................................................................................................... 25-26

Routine Maintenance ................................................................................................................................................. 27-28

Performance Test Data Sheet ......................................................................................................................................... 29

Troubleshooting ......................................................................................................................................................... 30-36

Wiring Diagrams ........................................................................................................................................................ 37-38

Instructions for using Cooling Load Estimate Form ........................................................................................................ 39

Cooling Load Estimate Form ........................................................................................................................................... 40

Heat Load Form ......................................................................................................................................................... 41-42

Warranty .......................................................................................................................................................................... 43

Technical Assistance ....................................................................................................................................................... 44

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.

• Make sure to follow proper lockout/tag out procedures.

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

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

potential capable of causing electric shock or electrocution.

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

procedures.

• Extreme 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

• Do 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.

• Electrical 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.

• Never operate the A/C unit with wet hands.

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

• Use on a properly grounded outlet only.

• Do not remove ground prong of plug.

• Do not cut or modify the power supply cord.

• Do not use extension cords with the unit.

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

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

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

REFRIGERATION SYSTEM HAZARDS:

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

opening system for repair.

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

to moderate injury.

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

surfaces can cause serious burns.

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

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

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

possible.

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

leaks, ﬂ ushing etc.

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

safety glasses, clothing etc.

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

MECHANICAL HAZARDS:

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

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

• Be careful when, handling and working around exposed edges and corners of sleeve, chassis, and

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

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

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

PROPERTY DAMAGE HAZARDS

FIRE DAMAGE HAZARDS:

• Read the Installation/Operation Manual for this air conditioning unit prior to operating.

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

• Connect to a properly grounded outlet only.

• Do not remove ground prong of plug.

• Do not cut or modify the power supply cord.

• Do not use extension cords with the unit.

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

WATER DAMAGE HAZARDS:

• Improper installation maintenance, or servicing of the air conditioner unit, or not following the above

Safety Warnings can result in water damage to personal items or property.

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

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

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

property damage.

INTRODUCTION

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

with each unit.

This service manual was written to assist the professional HVAC service technician to quickly and accurately

diagnose and repair any malfunctions of this product.

This manual, therefore, will deal with all subjects in a general nature. (i.e. All text will pertain to all models).

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.)

System Controls

Return Air Grille/Filter

Condenser Fan Blade

Compressor

Condenser Coil

Discharge Air

Outdoor Grille

Sleeve

Basepan

Blower Motor

Blower Wheel

Evaporator Coil

Front Cover

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 A A Y 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

X-Start

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

E = Electric Heat

X = Straight Cool

2nd Digit

Q = Chassis Size

3rd and 4th Digit - Approximate

BTU/HR in 1000s (Cooling)

Heating BTU/Hr capacity listed in the

Speciﬁ cation/Performance Data Section

7th Digit – Options

0 = Straight Cool

1 = 1 KW Heat Strip, Nominal

6th Digit – Voltage

1 = 115 Volts

Model Number Code

X Q 08 M 1 0 A - A

RAC Serial Number Identiﬁ cation Guide

UNIT IDENTIFICATION

8th Digit – Marketing Sufﬁ x

Indicates Modiﬁ cation

(Subject to change)

9th Digit – Engineering Sufﬁ x

Indicates Modiﬁ cation

(Subject to change)

5th Digit - Model Series / Year Introduced

M=2010

PERFORMANCE DATA *

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.

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

XQ05M10*, XQ06M10*,

XQ08M10*, XQ10M10*

EQ08M11*

125V - 15A 5 - 15P 6

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

Q14" 19

"21

3/8

½"

¾"

22" 42" 14 ¼" 20" 8 ½”

All models use

environmentally

friendly R-410A

refrigerant.

R-410A

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

meet the ENERGY STAR®

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.

Model

Cooling

Capacity Btu

Heating

Capacity Btu

Volts

Rated

Cooling

Amps

Cooling

Watts

Heating

Amps

Heating

Watts COP

Energy

Ratio

EER

Estimated

Yearly

Operating

Cost

Moisture

Removal

Pints/HR

Room Side

Air

Circulation

CFM Sleeve

Net

Weight

Lbs

XStar ®

XQ05M10*5500 — 115 4.5 491 — — 11.2 $39 1.0 170 Q 72

XQ06M10*6000 — 115 4.9 500 — — 12.0 † 1.0 175 Q 72

XQ08M10*7500 — 115 6.9 701 — — 10.7 $56 1.7 175 Q 71

XQ10M10*9500 — 115 9.0 970 — — 9.8 $56 2.5 180 Q 71

XStar ®

Electric Heat

EQ08M11*7500 4000 115 6.3 701 11.2 1290 2.8 10.7 $56 1.9 175 Q 72

Window Mounting Kits

Heat/Cool Models Kit No.

EQ08M11*WIKQ

Friedrich heat/cool models include accessories for

thru-the-wall installation only. Window mounting requires

use of optional accessory kit as listed above.

COOLING

PERFORMANCE DATA**

EVAP. AIR TEMP. DEG. F CONDENSER

TEMPERATURE DEG. F Discharge Temp Suction Temp Super Heat Sub-Cooling

OPERATING PRESSURES ELECTRICAL RATINGS R-410A

REF. Voltage

BREAKER FUSE

Discharge Air Temp.

Drop F. Suction Discharge Amps Cool Amps Heat Locked Rotor

Amps

Charge in

OZ. 60 Hertz Amps

Q-Chassis

XQ05M10*57 23 117 133 60 5 19 157 410 4.5 24.0 27.0 115 15

XQ06M10*54 26 120 152 63 12 18 150 410 4.9 25.0 21.0 115 15

XQ08M10*51 29 119 160 63 13 25 138 420 6.3 32.0 25.5 115 15

XQ10M10*47 33 131 176 59 12 32 132 490 9.8 57.0 24.0 115 15

EQ08M11*49 31 120 162 60 14 27 133 420 7.0 7.6 32.0 25.5 115 15

** Rating Conditions: 80 degrees F, room air temp. & 50% relative humidity, with 95 degree F, outside air temp & 40% relative humidity, all systems use R410A.

* Due to continuing research in new energy-saving technology, performance data and 8th and 9th character are subject to change without notice.

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

ELECTRICAL SHOCK HAZARD

WARNING

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 outlet.

Failure to follow these instructions can result in

electrical shock, serious injury or death.

To start unit

siti,elc at pec erreporpaotnideggulpdnadellatsnisirenoitidnocriaruoyfI

ready to go. The first time the unit is started, the compressor will delay for three

minutes. See Automatic Component Protection on the following page.

1Touch the Power button once. The unit will automatically be in Cool

mode with the temperature set at 75°F (24°C) and the fan speed at

F1, the sleep setting.

To set mode of operation

When you rst turn the unit on, it will be in the Cool mode (light on), with

constant fan.

2Touch the Mode button once to activate the MoneySaver®(light on).

MoneySaver®ros serp mocehthtiwnafehtselcyctahterutaefasi

so that the fan does not run all the time. This saves energy and

eromrofnaftnats nocreferpyamuoyrO.noit ac i dim uh edsevorpmi

ehthcuot,naftnatsnocotnruterot(tnem evomria Mode button two

more times).

In order to run the fan by itself, do the following:

3Continuing from MoneySaver®mode (light on), touch theMode button

once to activate the FAN ONLY feature (light on).

The FAN ONLY setting will circulate air in the room without the com-

pressor coming on.

To adjust temperature

4Use the Mode button to select either the COOL or MoneySaver®

function

5COOLER – Touch the button to lower the room air temperature.

6WARMER – Touch the button to raise the room air temperature.

7Press both the and ehthctiwsotemitemasehttasnottub

temperature readout from Fahrenheit (°F) to Celsius (°C).

Repeat step 7 to switch from °C back to °F.

To adjust fan speed

8Touch the Fan Speed button to see the current setting. Touch it again

to change speed. F1 is the lowest setting (SLEEP SETTING / LOW),

F2 is MEDIUM, and F3 is HIGH.

To activate Smart Fan

9There is a fourth option, SF, when selecting the fan speed. This is

the SMART FAN function. SMART FAN DOES NOT OPERATE IN

CONJUCTION WITH THE FAN ONLY MODE.

Smart Fan will adjust the fan speed automatically to maintain the

desired comfort level. For example, if the outside doors in your home

are opened for an extended period of time, or more people enter a

room, Smart Fan may adjust to a higher fan speed to compensate

for the increased heat load. This keeps you from having to adjust the

fan speed on your own.

How to operate the Friedrich room air conditioner (XQ models)

Temp/Hour

Cool

MoneySaver

Fan Only

Clock

StartTime

Stop Time

Power

Fan

Speed Mode

Timer Set

Hour

10 11 12

3 4

18 9 2 Figure 5

To set the hour clock

10 Touch the Set Hour button to see the current setting (clock light

comes on). The number that is displayed is the approximate time

(hour only). Use the and buttons to change the settings. BE

SURE TO SET A.M. AND P.M. ACCORDINGLY. (P.M. is indicated

by a red light in the upper left corner of the display).

To set the timer

NOTE: Set the HOUR CLOCK before attempting to set timer functions.

You can set the START and STOP times a minimum of one hour apart, and

a maximum of twenty-three hours apart.

11 After setting the time, press the Set Hour button once (Start light

comes on). Use the and buttons to select the time that the

unit will START.

12 After selecting the START time, press the Set Hour button once more

(Stop light comes on). Use the and buttons to select the time

that the unit will STOP. After selecting the stopping time, press the

Set Hour button once.

13 Press the Timer On/Off button (light turns on) to activate the timer

function. To deactivate this function, press the Timer On/Off button

once again (light turns off). Once the on and off times have been

selected, they will remain in memory and cycle daily until changed.

NOTE: If the unit is unplugged or the power is interrupted, the HOUR

must be reset or the Timer On/Off will not function when desired.

Automatic component protection

Your unit is equipped with Automatic Component Protection. To protect the

compressor of the unit, there is a three minute start delay if you turn the unit

off or if power is interrupted. The fan operation will not be affected. Also, if you

switch from Cool mode to Fan Only, and switch back to Cool mode, there

is a three minute delay before the compressor comes back on.

Figure 3

X Star

Temp/Hour

Cool

Money Saver

Fan Only

Clock

Start Time

Stop Time

Power

Fan

Speed Mode

Timer

On/Off Set

Hour

10 11 12

13 7

3 4

18 9 2

To set the timer

NOTE: You can set the START and STOP times a minimum of one hour

apart, and a maximum of 23 hours apart.

9TIMER START - Press Start .gniloocrofemittratstnerrucehtweivot

Continue pressing the Start button until you arrive at the start time

you desire. The start time for cooling will then be set.

10 TIMER STOP - Press the Stop button. Continue pressing the Stop

button until you arrive at the stop time you desire. The stop time for

cooling will then be set.

11 TIMER ON / OFF - Press the On/Off button to activate (light on) or

deactivate (light off) the timer. Once the on and off times have been

selected, they will remain in memory and cycle daily until changed.

NOTE: If the unit is unplugged or the power is interrupted, the Set Hr.

function must be reset or the On/Off function will not work.

How to use the remote control

To start unit

1POWER - Press the Power button once. The unit will automatically

start in the mode and fan speed it was last left on.

To set mode of operation

2COOL - Press the Cool button to automatically switch the operating

mode to COOL.

3FAN ONLY - Press the Fan Only button if you want to run the fan

only.

4MoneySaver®- Press the MoneySaver®button to activate the

MoneySaver®feature. This feature cycles the fan with the compres-

sor so that the fan does not run all the time.

To adjust temperature setting

5WARMER - Press the Warmer button to raise the temperature

setting.

6COOLER - Press the Cooler button to lower the temperature

setting.

To adjust fan speed

7FAN SPEED - Press the Fan Speed button to see the current set-

ting. Press again to change the fan speed. F1 is the lowest setting

(SLEEP / LOW), F2 is MEDIUM,F3 is HIGH, and SF is the SMART

FAN setting.

To set the hour clock

8SET HOUR CLOCK - Press Set Hr. once to see the current clock

setting. Continue pressing the button until you arrive at the current

time (Hour only). Minutes are not shown on the display. Make sure

that the A.M. / P.M. setting is correct. Additional RC1 wireless remote controls can be purchased from your Friedrich dealer.

(XQ models)

Money

Fan

Set Hr.

Stop

Start

Temperature

Fan

Cool

On/O

Cooler Warmer

Only Speed Saver®

Power

Timer Operation

How To Operate The EQ08

Function Control Knob

The left knob is a six position control that allows you to

select heat or cool in either low speed or high speed. Plus

you can select fan only if you wish.

Thermostat Knob

The right hand knob is the thermostat - turn it clockwise for

cooler, counter-clockwise for warmer.

MODE CONTROL

The mode control pad(s) allow the selection of the operating

modes of the unit.

There is a two second delay before the mode activates its

appropriate relay.

OPERATING SEQUENCE / CHARACTERISTICS

AND FEATURES

Compressor Operation

The run state of the compressor is determined by the

difference between the indoor ambient temperature and

the set temperature. See speciﬁ c mode of operation for

details.

Compressor Time Delay: 180 seconds

This feature is initiated every time the compressor is de-

energized, either due to:

(1) satisfying the temperature set point

(2) changing mode to fan only

(3) a power interruption or

(4) turning the unit off

The compressor is also time delayed for 3 minutes when the

control is ﬁ rst plugged in or power is restored after failure.

When the compressor cycles off as a result of satisfying the

“load”, the time delay is typically timed out during the off

cycle. Compressor time delay is bypassed by “Test Mode”.

Return Air Temperature Sensor

The control range is 60°F to 90°F +/- 2.0°F.

Frost Protection Sensor

Temperature settings:

Disable the compressor when sensing 30° +/- 3°F for 2

minutes continuously.

Enable compressor @ 55° +/- 5°F.

The fan should not be affected by the Frost Protection. It

should continue to function normally if freeze protection is

called for.

COOL MODE FOR XQ MODELS

When in the COOL mode, the control will turn on the

compressor when the indoor temperature is 1.5°F above the

set point and turn off the compressor when the ambient gets

below the set point by 1.5°F. The fan will run continuously.

MONEY SAVER MODE

When in MONEY SAVER mode, the system will be turned

on when the indoor temperature gets above the set point by

0.75°F and turns off when the indoor temperature gets below

the set point by 0.75°F. The fan will turn on 5 seconds before

the compressor and turn off 5 seconds after the compressor

stops. If the compressor is delayed the fan will continue to

run while the compressor restarts. If the thermostat remains

satisﬁ ed for more than approximately 9 minutes, the fan will

turn on for a period of 90 seconds for air sampling. Operation

in MONEY SAVER mode will light both the MONEY SAVER

and COOL indicators.

ELECTRONIC CONTROL SEQUENCE OF OPERATION

FAN ONLY MODE

When in the FAN ONLY mode, the compressor will not

operate. The fan will run continuously at the user-selected

speed (see “Fan Speed Set” below). Smart Fan is not

available in FAN ONLY Mode.

FAN SPEED SET

XQ fan speed is changed by pressing FAN SPEED button

and scrolling through F1, F2, F3 and SF (Smart Fan) in the

digital display.

There will be a 2 second delay before the fan speed changes

to prevent unnecessary switching of the relays during fan

speed selection.

SMART FAN

On the XQ model, smart fan is activated by pressing the

FAN SPEED button and scrolling through speeds until

“SF” appears in the digital display. Using the remote

control, Smart Fan is selected by the fourth push of Fan

Speed button.

Smart fan changes fan speeds based on the temperature

differential between the ambient and set temperatures.

CHECKING ROOM TEMPERATURE

Check the room temperature at the electronic control

pad by pressing the “FAN SPEED” button and the

“TEMP ” button at the same time on XQ models.

The indoor temperature will display for 10 seconds. Indoor

temperature can be viewed in all modes, including the

TEST mode. The display can be changed back to SET

temperature by pressing any key, except the ON/OFF

button, or after 10 seconds has elapsed.

KEEP ALIVE

The electronic control has a memory to retain all functions

and status as set up by the user in the event of a power

failure. Once power is restored to the unit there is a two

second delay before the fan comes on and approximately

three minutes delay before the compressor is activated,

providing that the mode was set for cooling and the set

point temperature has not been met in the room.

REBOOT/RESET THE CONTROL BOARD

With unit on, press “MODE” and “TEMP/HOUR ” buttons

simultaneously for 10 seconds. If the panel will reboot, you

will hear the fan come on and the temperature window

will read 60°F. If this happens, turn the unit off for about

10 seconds and then turn it back on to ﬁ nish the reboot

cycle. If the panel does not reboot, you possibly need to

replace it.

MECHANICAL COMPONENTS

Plenum assembly Diffuser with directional louvers used

to direct the conditioned airﬂ ow.

Blower wheel Attaches to the indoor side of the fan motor

shaft and is used for distributing unconditioned, room side

air though the heat exchanger and delivering conditioned

air into the room.

Slinger fan blade Attaches to the outdoor side of the fan

motor shaft and is used to move outside air through the

condenser coil, while slinging condensate water out of the

base pan and onto the condenser coil, thus lowering the

temperature and pressures within the coil.

ELECTRICAL COMPONENTS

Thermostat Used to maintain the speciﬁ ed room side

comfort level

System switch Used to regulate the operation of the fan

motor, the compressor or to turn the unit off. For troubleshoot-

ing, refer to the wiring diagrams and schematics in the back

of this service manual.

Capacitor Reduces line current and steadies the voltage

supply, while greatly improving the torque characteristics of

the fan motor and compressor motor.

MoneySaver® switch When engaged, it sends the power

supply to the fan motor through the thermostat, which allows

Smart Fan Automatically adjusts the fan speed to main-

tain the desired room temp.

for a cycle-fan operation.

Fan Motor Dual-shafted fan motor operates the indoor

blower wheel and the condenser fan blade simultaneously.

Heating element Electric resistance heater, available in

EQ08 model.

Heat anticipator Used to provide better thermostat and

room air temperature control.

HERMETIC COMPONENTS

Compressor Motorized device used to compress refrigerant

through the sealed system.

Capillary tube A cylindrical meter device used to evenly dis-

tribute the ﬂ ow of refrigerant to the heat exchangers (coils.)

FUNCTIONAL COMPONENT DEFINITIONS

TESTING THE ELECTRONIC CONTROL

BOARDS FOR XQ MODELS

Activating Test Mode:

Activate test mode by pressing at the same time the

“MODE” button and the “TEMP ” button on XQ

models. LEDs for Hour, Start, and Stop will blink 1 bps

while Test Mode is active.

Test Mode has duration of 90 minutes. Test Mode can

be activated under any conditions, including Off. Test

Mode is cancelled by pressing the On/Off button,

unplugging the unit, or when the 90 minutes is timed

out. All settings revert to the factory default settings of

Cool, 75 degrees F, Timer and Set Hour features are

nonfunctional.

Test Mode overrides the three-minute lockout, all

delays for compressor and fan motor start / speed

change, and no delay when switching modes.

During Test Mode, the default settings are; Unit ON,

Money Saver ON, 60°F, and High fan speed.

IMPORTANT: Error Codes are cleared from the

log by exiting from Error Code Mode. To exit on XQ

models, press Timer On/Off button. Or unplug unit to

exit Error Code Mode. Plug unit in after 5 seconds to

resume normal operation of unit.

Activating Error Code Mode: (Submode of Test Mode)

Unit must be in Test Mode to enter Error Code Mode

1. Activate Error Code Mode by pressing the “TIMER ON/

OFF” button on XQ models. LED for the “TIMER ON/OFF”

will ﬂ ash 1 bps while Error Code Mode is active. Pressing

the “TEMP/HR ” button will display 00. Consecutive

presses will scroll through all error codes logged. Press

the “TEMP/HR ” button to see the reverse order of all

error codes logged. When the end of logged error codes is

reached the temperature set point will appear.

COMPONENTS TESTING

ERROR CODE LISTINGS

E1 SHORT CYCLE SITUATION: Deﬁ ned as (compressor

powered on before the three minute time delay ten times in

one hour. Investigate and correct short cycling problem.

E2 KEYBOARD STUCK ERROR: If key button(s) are

pressed continuously for twenty seconds or more. If MODE

key is stuck, unit will default to cool. Exit Error Code

Mode to see if error “E2” is no longer displayed and unit is

functioning. Replace board if “E2” still displays after exiting

Error Code Mode.

E3 FROST PROBE OPEN: Normal operation is allowed.

Ohm frost probe. Replace probe if ohm value not read. If

ohm value is present replace board.

E4 FROST PROBE SHORT: Normal operation allowed.

Replace probe.

E5 INDOOR PROBE OPEN: Control assumes indoor

ambient temperature is 90 degree F and unit will operate.

Ohm indoor probe. Replace probe if ohm value not read.

E6 INDOOR PROBE SHORT: Control assumes ambient

temperature is 90 degree F and unit will operate. Replace

probe.

NOTE: All Error Code displays for Frost & Indoor Probe

will allow unit to operate. Unit may or will ice up if faulty

components not replaced.

FROST PROBE SENSOR: disables compressor at 35

degrees F.

INDOOR PROBE SENSOR: Control range is 60°F to 90°F

+/- 2°F.

Indoor temperature will be displayed by pressing:

(XQ units) The Fan Speed button and the “TEMP ”

button.

The indoor temperature will be displayed for 10 seconds.

The display will change back to the Set Point temperature

by pressing any key button except for the On/Off button.

The indoor temperature can be viewed in all modes,

including test mode.

X Star

Temp/Hour

Cool

Money Saver

Fan Only

Clock

Start Time

Stop Time

Power

Fan

Speed Mode

Timer

On/Off Set

Hour

TEST:

1. Remove leads from thermostat.

2. Turn thermostat knob clockwise to its coldest

position.

3. Test for continuity between the two terminals. Contacts

should be closed.

4. Turn thermostat knob counterclockwise to its warmest

position.

5. Test for continuity - contacts should be open.

NOTE: The thermostat must be within the temperature

range listed to open and close.

To maintain the comfort level desired, a cross ambient type

thermostat is used. The thermostat has a range from 60°

±2°F to 92° ±3°F. The thermostat bulb is positioned in front

of the evaporator coil to sense the return air temperature.

Thermostat malfunction or erratic operation is covered in

the troubleshooting section of this manual.

THERMOSTAT (“EQ08” Models)

(See Figure 17)

This thermostat is single pole-double throw, cross ambient

with a range of 60° to 92°F and a differential of ±2°F. Terminal

“2” is common.

Figure 17

Thermostat

(EQ Model)

Figure 18

Thermostat

TEST:

Cooling/Heating Models: Remove wires from thermostat

and check continuity between terminal “2” (common) and

“3” for cooling. Check between terminals “2” (common)

and “1” for heating. Also check that contacts in thermostat

open after placing in either position. NOTE: Temperature

must be within range listed to check thermostat. Refer to

the troubleshooting section in this manual for additional

information on thermostat testing.

THERMOSTAT ADJUSTMENT

No attempt should be made to adjust thermostat. Due

to the sensitivity of the internal mechanism and the

sophisticated equipment required to check the calibration,

it is suggested that the thermostat be replaced rather than

calibrated. Thermostat bulb must be straight to insure

proper performance.

THERMOSTAT BULB LOCATION

The position of the bulb is important in order for the

thermostat to function properly. The bulb of the thermostat

should be located approximately 45° to a maximum of 60°

from horizontal. Also, do not allow the thermostat bulb to

touch the evaporator coil. (See Figures 17 and 18)

Thermostat sensor holder 020

to be positioned between the

4th and 5th and 6th and 7th

rows of tubes from the bottom

of the coil at dimension shown

Figure 19

Thermostat Bulb Location

(EQ Model)

COMPONENTS TESTING (Continued)

ELECTRIC SHOCK HAZARD

WARNING

Disconnect power to the unit before

servicing. Failure to follow this warning

could result in serious injury or death.

EQ08 SYSTEM CONTROL SWITCH - TEST

“EQ08” SYSTEM CONTROL SWITCH – TEST

Turn knob to phase of switch to be tested. There must be

continuity as follows:

1. “Fan Only” Position – between terminals “MS” and “H”

2. “Hi Cool” Position – between terminals “L1” and “C” and

“MS” and “H”

3. “Low Cool” Position – between terminals “L1” and “C”

and “MS” and “LO”

4. “Low Heat” Position – between terminals “L2” and “2”

and “MS” and “LO”

5. “Hi Heat” Position – between terminals “L2” and “2” and

“MS” and “H”

System Control Switch

(EQ Models)

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

FIGURE 24

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 (Continued)

HEATING ELEMENT (See Figure)

All electric heat models are equipped with a heating element.

The EQ08 has a 1.15 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.

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 10.11

ohms for the 1.15 KW heater should be registered.

Figure

Heating Element

DRAIN PAN VALVE

During the cooling mode of operation, condensate which

collects in the drain pan is picked up by the condenser 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 condenser

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.

Figure 26

Bellows Assembly

Drain Pan Valve

COMPONENTS TESTING (Continued)

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 XStar 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 R410-A

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 RAC 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.

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 speciﬁed 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.

Amperage (L.R.A.) Test

The running amperage of the compressor is the most impor-

tant 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 speciﬁcation 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 compres-

sor. 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.).

External Overload

The compressor is equipped with an external overload

which senses both motor amperage and winding tem-

perature. High motor temperature or amperage heats the

overload causing it to open, breaking the common circuit

within the compressor.

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 External Overload

With power off, remove the leads from compressor termi-

nals. If the compressor is hot, allow the overload to cool

before starting check. Using an ohmmeter, test continu-

ity across the terminals of the external overload. If you

do not have continuity; this indicates that the overload is

open and must be replaced.

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

Remove the leads from the compressor terminals and set

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

Touch the leads of the ohmmeter from terminals common

to start (“C” to “S”). Next, touch the leads of the ohmmeter

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

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

check resistance from start to run terminals (“S” to “R”).

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

value will be from the start to the run connections (“S” to

“R”). The next highest resistance is from the start to the

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 ﬂ ow 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. Defective capacitors.

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 R410-A 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 ﬁ lter drier

from the system.

Flush evaporator condenser and all connecting

tubing with dry nitrogen or equivalent. Use approved

ﬂ ushing 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 COMPRESSOR SPECIAL TROUBLESHOOTING

AND SERVICE

ROUTINE MAINTENANCE

AIR FILTER

Clean the unit air intake ﬁ lter at least every 300 to 350 hours

of operation. Clean the ﬁ lters with a mild detergent in warm

water and allow to dry thoroughly before reinstalling.

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 verti-

cal 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 housing, evaporator blade, con-

denser 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 con-

denser 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.

Use an electronic tester to measure wet bulb temperatures

indoors and outdoors.

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.

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.

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.

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

System Controls

Return Air Grille/Filter

Condenser Fan Blade

Compressor

Condenser Coil

Discharge Air

Outdoor Grille

Sleeve

Basepan

Blower Motor

Blower Wheel

Evaporator Coil

Front Cover

29 29

Due to variations in room design, climate zone and occupancy, larger areas

may require the use of multiple units to provide the optimal cooling solution.

This is a general guide.

Please consult manual J or M for exact load calculations.

1. If heavily shaded, reduce capacity 10%.

2. If very sunny, add 10%.

3. Add 500 BTU/H per person over 2 people.

4. Add 4,000 BTU/H if area is a kitchen.

ROOM AIR CONDITIONER UNIT

PERFORMANCE TEST DATA SHEET

DATE: _______________ MODEL:_______________ SERIAL:________________

YES NO

IS THERE A FRIEDRICH SLEEVE INSTALLED? ____ ____

IS THERE A CHASSIS SEAL GASKET INSTALLED? ____ ____

IS MAINTENANCE BEING PERFORMED? ____ ____

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

RUNNING AMPS --------- AMPS

LOCKED ROTOR VOLTAGE --------- VOLTS

INDOOR TEMPERATURES:

INDOOR AMBIENT TEMPERATURE -------- F

RELATIVE HUMIDITY (RH) INDOOR -------- %

COOL HEAT

DISCHARGE AIR TEMPERATURE (INDOOR) ---------- F --------- F

RETURN AIR TEMPERATURE (INDOOR) ---------- F --------- F

DIFFERENTIAL ---------- F --------- F

OUTDOOR TEMPERATURE:

OUTDOOR AMBIENT TEMPERATURE --------- F

RH OUTDOOR --------- %

CONDENSER:

DISCHARGE AIR TEMPERATURE (OUTDOOR) --------- F ---------- F

INTAKE AIR TEMPERATURE (OUTDOOR --------- F ---------- F

DIFFERENTIAL --------- F ---------- F

APPLICATION USE ------------------------- ROOM (RESIDENTIAL OR COMMERCIAL)

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.

GENERAL TROUBLESHOOTING TIPS

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

GENERAL TROUBLESHOOTING TIPS (CONTINUED)

Problem Possible Cause Possible Solution

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

noitcA esuaC elbissoP melborP

Compressor

does not run

Low voltage Check voltage at compressor. 115V & 230V

units will operate at 10% voltage variance

T-stat not set cold enough or

inoperative or electronic control

board is bad

Set t-stat to coldest position. Test t-stat &

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 switch,

thermistor or electronic board

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

noitcA esuaC elbissoP melborP

Fan motor

does not run

Inoperative system switch Test switch & replace if inoperative

Broken, loose or incorrect wiring Refer to applicable wiring diagram

Open capacitor Test capacitor & replace if inoperative

Fan speed switch open Test switch & replace if inoperative

Inoperative fan motor Test fan motor & replace if inoperative (be sure

internal overload has had time to reset)

noitcA esuaC elbissoP melborP

Does not cool or

only cools slightly

Undersized unit Refer to industry standard sizing chart

T-stat open or inoperative

Thermistor or electronic board is bad, Set to coldest position. Test t-stat or electronic

control board & replace if necessary.

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

on applicable models

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

noitcA 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 switch in “OFF” position Set switch correctly

Inoperative system switch or open

electronic control board Test for continuity

Loose or disconnected wiring at

switch, control board or other com-

ponents

Check wiring & connections. Reconnect per

wiring diagram

noitcA 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 t-stat or thermistors Test for continuity

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. Check temp. differential (delta T)

across coil. Touch test coil return bends for

same temp. Test for low running current

noitcA esuaC elbissoP melborP

Compressor runs

continually & does

not cycle off

Excessive heat load Unit undersized. Test cooling performance &

replace with larger unit if needed

Restriction in line Check for partially iced coil & check

temperature split across coil

Refrigerant leak

Check for oil at silver soldered connections.

Check for partially iced coil. Check split across

coil. Check for low running amperage

T-stat contacts stuck Check operation of t-stat. Replace if contacts

remain closed.

T-stat incorrectly wired Refer to appropriate wiring diagram

Thermistor shorted Replace thermistor or electronic control board

noitcA esuaC elbissoP melborP

T-stat does not

turn unit off

T-stat contacts stuck

Disconnect power to unit. Remove cover

of t-stat & check if contacts are stuck. If so,

replace t-stat

T-stat set at coldest point Turn to higher temp. setting to see if unit

cycles off

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

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

noitcA 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

Allow a minimum of 2 minutes to allow

pressures to equalize before attempting to

restart. Instruct customer of waiting period

Low or À uctuating voltage

Check voltage with unit operating. Check for

other appliances on circuit. Air conditioner

should be in separate circuit for proper voltage

& fused separately

Incorrect wiring Refer to appropriate wiring diagram

Shorted or incorrect capacitor Check by substituting a known good capacitor

of correct rating or test cap

Restricted or low air À ow through

condenser coil or evaporator coil

Check for proper fan speed or blocked

coils

Compressor running abnormally

hot

Check for kinked discharge line or restricted

condenser. Check amperage

noitcA esuaC elbissoP melborP

T-stat does not

turn unit on

Loss of charge in t-stat bulb

(EQ08M11)

Place jumper across t-stat terminals to check if

unit operates. If unit operates, replace t-stat.

Loose or broken parts in t-stat Check as above

Incorrect wiring Refer to appropriate wiring diagram

Defective thermistor Replace thermistor or electronic control board

noitcA 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. Correct as needed

noitcA esuaC elbissoP melborP

Water leaks into

the room

Evaporator drain pan overÀ 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

Chassis gasket not installed Install gasket, per Installation manual

Downward slope of unit is too

steep inward

Refer to installation manual for proper

installation

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

noitcA 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

noitcA 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

noitcA esuaC elbissoP melborP

T-stat or

thermistor

short cycles

Defective thermistor Replace thermistor or electronic control board

T-stat differential too narrow Replace t-stat

Plenum gasket not sealing,

allowing discharge air to short

cycle t-stat

Check gasket. Reposition or replace as

needed

Restricted coil or dirty ﬁ lter Clean & advise customer of periodic cleaning

& maintenance needs of entire unit

noitcA esuaC elbissoP melborP

Prolonged off

cycles (automatic

operation)

Heat anticipator (resistor) wire

disconnected at t-stat or system

switch

Refer to appropriate wiring diagram

Heat anticipator (resistor) shorted or

open

Disconnect plus from outlet. Remove resistor

from bracket. Insert plug & depress “COOL”

& “FAN AUTOMATIC” buttons. Place t-stat to

warmest setting. Feel resistor for temperature.

If no heat, replace resistor

Partial loss of charge in t-stat bulb

causing a wide differential Replace t-stat

Defective thermistor Replace thermistor or electronic control board

noitcA 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

HEAT / COOL ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

noitcAesuaC elbissoPmelborP

Room temperature

uneven

(Heating cycle)

Heat anticipator (resistor) shorted (on applicable

models)

Disconnect power to unit. Remove resistor from

t-stat bulb block. Plug in unit & allow to operate.

Feel resistor for heat. If not heat, replace resistor

Wide differential - partial loss of t-stat bulb charge Replace t-stat

Incorrect wiring

Refer to appropriate wiring diagram. Resistor is

energized during "ON" cycle of compressor or

fan.

noitcAesuaC elbissoPmelborP

Does not heat

adequately

Opened doors or windows Close doors or windows.

Dirty ﬁlaunaM s'renwO ni dednemmocer sa naelCretl

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

Heater hi-limit control cycling on & off Check for adequate fan air across heater. Check

control for open at 110°F & close at 100°F

Shorted or opened heater Ohmmeter/continuity check

margaid gniriw elbacilppa kcehCgniriw tcerrocnI

* NOTE: Heater size on the EQ08M11 is: 1.15 KW.

ELECTRONIC CONTROL

COOL ONLY MODELS:

XQ05M10* XQ06M10* XQ08M10* XQ10M10*

*Last character may vary.

ELECTROMECHANICAL CONTROL

COOL WITH ELECTRIC HEAT MODEL:

EQ08M11*

*Last character may vary.

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

10001 Reunion Place, Suite 500

San Antonio, TX 78216

1-800-541-6645

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:

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. A

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

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.

3. Providing a replacement unit of equal value

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:

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)

TECHNICAL SUPPORT

CONTACT INFORMATION

FRIEDRICH AIR CONDITIONING CO.

10001 Reunion Place, Ste. 500, San Antonio, TX 78216

(210) 546-0500 877-599-5665 x 261 FAX (210) 546-0731

Email: tac@friedrich.com

www.friedrich.com

Printed in the U.S.A.

X-Star-ServMan (1-11)

FRIEDRICH AIR CONDITIONING CO.

10001 Reunion Place, Ste. 500, San Antonio, TX 78216

P 210-546-0500 | F 210-546-0731

www.friedrich.com

Printed in the U.S.A.

Friedrich Air Conditioner Eq08M11 Users Manual Xstar_ServMan_02 21 11

XQ05M10 to the manual 8800c6a3-bee2-46a0-87cc-ea4c3810f2ad

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