LENNOX Air Conditioner/heat Pump(outside Unit) Manual L0806422

User Manual: LENNOX LENNOX Air conditioner/heat pump(outside unit) Manual LENNOX Air conditioner/heat pump(outside unit) Owner's Manual, LENNOX Air conditioner/heat pump(outside unit) installation guides

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,?_2008 Lennox industries Inc,

Dallas, Texas, USA

INSTALLATION

INSTRUCTIONS

Merit®Series13HPX Units

HEAT PUMP UNITS _Technical

505,325M LLJJ Publications

03/08 Litho U.S.A.

Supersedes 07/07

WARNING

A CAUTION

AIMPORTANT

IMPORTANT

13HPX Outdoor Unit ........................... 1

Shipping and Packing List ...................... 1

Unit Dimensions ............................... 2

General Information ........................... 2

Setting the Unit ............................... 3

Electrical ..................................... 4

Refrigerant Piping ............................. 6

Flushing Existing Line Set and Indoor Coil ........ 8

Refrigerant Metering Device .................... 10

Manifold Gauge Set ........................... 10

Service Valves ................................ 10

Leak Testing .................................. 11

Evacuation ................................... 11

Start-Up ...................................... 12

Refrigerant Charge ............................ 12

Checking Airflow .............................. 12

Setup for Checking and Adding Charge .......... 13

System Operation ............................. 17

Defrost System ............................... 17

Maintenance .................................. 18

Optional Accessories .......................... 19

Homeowner Information ........................ 19

Thermostat Operation .......................... 20

13HPX Check List ............................. 20

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

13HPX Merit ® outdoor units use HFC-410A refrigerant.

This unit must be installed with a matching indoor blower

coil and line set as outlined in the Lennox Engineering

Handbook. 13HPX outdoor units are designed for use in

expansion valve systems only. They are not designed to be

used with other refrigerant flow control devices. An expan-

sion valve approved for use with HFC-410A must be or-

dered separately and must be installed prior to operating

the unit.

1 - Assembled 13HPX outdoor unit

Check the unit components for shipping damage. If you

find any damage, immediately contact the last carrier.

03/08

IIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Page 1 505,325M

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

Inlet Air

,_lnletAir

InletAir

Vapor Line

Connection

Ai'_ru Liquid Line

Inlet Connection

Optional Unit Stand-

off Kit (4) (Field-

installed',

Coil Drain Outlets

(Around Perimeter

Of Base)

4-3/8

(111)

6-3/8

(182)

4-3/8

(111)

4-3/8

(111)

TOP VIEW TOP VIEW BASE SECTION

SIDE VIEW

Model No. A C

13HPX-018 24-1/4 (616) 32-1/2 (826)

13HPX-024 24-1/4 (616) 32-1/2 (826)

13HPX-030 24-1/4 (616) 28-1/2 (724)

13HPX-036 24-1/4 (616) 32-1/2 (826)

13HPX-042 28-1/4 (616) 32-1/2 (826)

13HPX-048 28-1/4 (718) 36-1/2 (927)

13HPX-060 28-1/4 (718) 42-1/4 (1073)

3/4 (19)

33-1/4 (845)

29-1/4 (743)

33-1/4 (845)

37-1/4 (946)

43-1/4 (1099)

These instructions are intended as a general guide and do

not supersede national or local codes in any way. Consult

authorities having jurisdiction before installation.

OutdoorCoil Fan \ tDischarge

Compressor_

Vapor & Liquid

Line Connections

2-3/4 (70)

Optional Unit

Stand-off Kit (4)

(Field-installed)

SIDE VIEW

When servicing or repairing HVAC components, ensure

caps and fasteners are appropriately tightened. Table 1

lists torque values for typical service/repair items.

Table 1. Torque Requirements

Part Recommended Torque

Liquid service valve cap 8 ft.- lb. 11 NM

Suction service valve cap 11 ft.- lb. 15 NM

Sheet metal screws 16 in.- lb. 2 NM

Machine screws #8 28 in.- lb. 3 NM

Compressor bolts 90 in.- lb. 10 NM

Gauge port seal cap 85ft.- lb. 7 NM

505325 03/08

Page 2

WARNING

CAUTION

Outdoor units operate under a wide range of weather con-

ditions; therefore, several factors must be considered

when positioning the outdoor unit. Unit must be positioned

to give adequate clearances for sufficient airflow and servi-

cing. A minimum clearance of 24 inches (610 mm) be-

tween multiple units must be maintained. Refer to figure 1

for installation clearances.

1. Place a sound-absorbing material, such as Isomode,

under the unit if it will be installed in a location or posi-

tion that will transmit sound or vibration to the living

area or adjacent buildings.

2. Mount unit high enough above ground or roof to allow

adequate drainage of defrost water and prevent ice

build-up.

3. In heavy snow areas, do not locate unit where drifting

will occur. The unit base should be elevated above the

depth of average snows.

NOTE- Elevation of the unit may be accomplished by

constructing a frame using suitable materials. Ira sup-

port frame is constructed, it must not block drain holes

in unit base.

4. When installed in areas where low ambient tempera-

tures exist, locate unit so winter prevailing winds do

not blow directly into outdoor coil.

5. Locate unit away from overhanging roof lines which

would allow water or ice to drop on, or in front of, coil

or into unit.

(AS NOTED)

*A service clearance of 30" (702 mm) must be maintained on one

of the sides adjacent to the control box. Clearance to one of the

other three sides must be 36" (914 mm), Clearance to one of the

remaining two sides may be 12" (305 mm) and the final side may

be 6" (152 mm).

A clearance of 24" (610 mm) must be maintained between two

units, 48" (1219 mm) clearance required on top of unit, Maximum

soffit overhang is 36" (914 mm).

Figure 1 Installation Clearances

SLAB MOUNTING

When installing the unit at grade level, the top of the slab

should be high enough above the grade so that water from

higher ground will not collect around the unit, See figure 2.

The slab should have a slope tolerance away from the

building of 2 degrees or 2 inches per 5 feet (51 mm per

1524 mm). This will prevent ice build-up under the unit dur-

ing a defrost cycle. Refer to roof mounting section for barri-

er construction if the unit must face prevailing winter winds,

STRUCTURE DISCHARGE AIR

,I/I/I/I/I/

l/I/////

MOUNTING SLAB MUST SLOPE

AWAY FROM BUILDING.

GROUNDLEVEL

Figure 2. Slab Mounting At Ground Level

ROOF MOUNTING

Install unit a minimum of 6 inches (152 mm) above the roof

surface to avoid ice build-up around the unit. Locate the

unit above a load bearing wall or area of the roof that can

adequately support the unit, Consult local codes for roof-

top applications,

Page 3

13HPX SERIES

PREVAILINGWINTERWINDS

I WINDBARRIER I

INLET AIR

INLET AIR INLET AIR

0 0

INLET AIR

Figure 3. Rooftop Application Wind Barrier

Construction

If unit coil cannot be mounted away from prevailing winter

winds, construct a wind barrier. Size barrier at least the

same height and width as the outdoor unit. Mount barrier

24 inches (610 mm) from the sides of the unit in the direc-

tion of prevailing winds.

In the U.S.A., wiring must conform with current local codes

and the current National Electric Code (NEC). In Canada,

wiring must conform with current local codes and the current

Canadian Electrical Code (CEC).

WARNING I

Refer to the furnace or blower coil installation instructions

for additional wiring application diagrams and refer to unit

nameplate for minimum circuit ampacity and maximum

overcurrent protection size.

1. Install line voltage power supply to unit from a properly

sized disconnect switch.

Ground unit at unit disconnect switch or to an earth

ground.

NOTE -To facilitate conduit, a hole is in the bottom of

the control box. Connect conduit to the control box

using a proper conduit fitting.

NO TE -Units are approved for use only with copper

conductors. 24V, Class II circuit connections are

made in the low voltage junction box. Refer to figure 4

for field wiring diagram.

NOTE -A complete unit wiring diagram is located in-

side the unit control box cover.

NOTE -For proper voltages, select thermostat wire

gauge per the following chart:

Wire run length AWG # Insulation type

less than 100' (30m) 18 color-coded, temperature

more than 100' (30m) 16 rating 35°C minimum

Install room thermostat (ordered separately) on an in-

side wall approximately in the center of the conditioned

area and 5 feet (1.5 m) from the floor. It should not be

installed on an outside wall or where it can be effected

by sunlight, drafts or vibrations.

Install low voltage wiring from outdoor to indoor unit

and from thermostat to indoor unit. See figures 6 and

NOTE - 24V, Class II circuit connections are made in

the low voltage junction box.

OUAL

CAPACITOR @_ @ ._.-

_C_

--- @

THERIIOST AT

,_ I I_j, I

_-_J_j II

..... .I

208-230/60/I

mll 2 _

1,6ROUND

Z_ NOTE-

FOR USE WITH COPPER CONDUCTORS ONLY.REFER TO UNIT RATING

PLATE FOR MINIMUM CIRCUIT AUPACITY AND MAXIMUM OVER-

CURRENT PROTECTION SIZE

WARNING-

ELECTRIC SHOCK HAZARD,

Z_ CAN CAUSE INJURYOR DEATH.

UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL

AND LOCAL CODES.

Figure 4. Typical Field Wiring Diagram

505325 03/08

Page 4

OUTDOOR

FAN

PURPLE

BLACK

ORANGE

RED

LLOW

COMPRESSOR

CRANKCASE HEATER

BLACK

GROUND

LUG

)_DUAL

CAPACITOR

BLACK

DEFROST CONTROL

FAN

pOUT

LO-PS R 0

-_ O 0

COMMON

Y I BUT

HI=PS

THERMOSTAT

o.r_.,o®e]

I I I t _

Iljll

----Jl II

J I I

J l

208-230/60/I

IIL2 z_x

DLE

I,'BROUNO

CMC

FAN

o OUT

LO--PB

OF L

COMMON yO

_OUT I

HI -PS

THERMOSTATOEPROSTb _REVERSINGvALVE

LB20:B3OXBOZ';

"]_ _IORANGF ¢_

T _ BLACK IS

I_._ b Ir- r_v _ I

EQUIPMENTHR' ]__A_ _L-_c_ SLACK KI_

r_ NOTE-

FOR USE WITH COPPER CONDUCTORS

DESCRIPTION ONLY.REFER TO UNIT RATING

<EY COMPONENT PLATE FOR MINIMUM CIRCUIT

hi COMPRESSOR AMPACITY AND MAXIMUM OVER-

84- _OTOR-OUTDOOR FAN CURRENT PROTECTION SIZE.

CJ2 CAPACITOR- DUAL

CMCI CONTROL-DEFROST A

4RI hEATER-COMPRESSOR $41 TO BE MOUNTED IN

_11-1 :ONTACTOR-COMPREBBOR CONTROL BOX AND WIRED

L ¢ALVE=REVERSING IN PARALLEL WITH LOW

]4 _WITCH=HIGH PRESSURE PRESSURE SWITCH

_6 5W] TCH=DEFROST

540 THERMOSTAT-CRANKCASE

341 FHERMOSTAT=LOW AMBIEN_

_87 _WITCH=LOW PRESSURE

LOW 587

__ I I I LOW

II_)_ZENTpRESSU2#

'11

I I

CONNECTION MUST BE JUMPERED WHEN

OPTIONAL SWITCH IS NOT USED

WARNING-

ELECTRIC SHOCK HAZARD,CAN CAUSE INJURY OR

DEATH. UNIT MUST BE GROUNDED IN ACCORDANCE

WITH NATIONAL AND LOCAL CODES,

-,,_-------DENOTES OPTIONAL COMPONENTS

LINE VOLTAGE FIELD INSTALLED

-- -- -- CLASS I I VOLTAGE FIELD INSTALLED

Figure 5. 13HPX Outdoor Unit Typical Wiring Diagram

Page 5

13HPX SERIES

Thermostat

power

common

(_) 1st. stage aux. heat

Indoor

Unit

-k_

indoor blower .

reversing valve

compressor

(SOME CONNECTIONS MAY NOT APPLY. REFER

TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)

Outdoor

Unit

power

common

1st. stage aux. heat _)

Figure 6.13HPX and Blower Unit Thermostat Desig-

nations

Indoor

Thermostat Unit

power

common ¢

emergency heat It

]

1st. stage aux. heat _-

indoor blower

reversing valve

.power

_ common

emer.

J outdoor t'stat

-lZ_st. stage aux. heat

®l

compressor

(SOME CONNECTIONS MAY NOT APPLY. REFER TO

SPECIFIC THERMOSTAT AND INDOOR UNIT.)

Outdoor

Unit

Figure 7. Outdoor Unit and Blower Unit Thermostat

Designations (with auxiliary heat)

If the 13HPX unit is being installed with a new indoor coil

and line set, the plumbing connections should be made as

outlined in this section. If an existing line set and/or indoor

coil is going to be used to complete the 13HPX system, re-

fer to the following section that includes flushing proce-

dures,

Field refrigerant piping consists of liquid and vapor lines

from the outdoor unit (sweat connections) to the indoor coil

(flare or sweat connections).

Use Lennox L15 (sweat, non-flare) series line sets as

shown in table 2 or use field-fabricated refrigerant lines,

Refer to Refrigerant Piping Guide (Corp. 9351-L9) for

proper size, type, and application of field-fabricated lines.

Valve sizes are also listed in table 2,

PLUMBING CONNECTIONS--13HPX MATCHED

WITH NEW INDOOR COIL AND LINE SET

If you are replacing an existing coil that is equipped with a

liquid line functioning as a metering orifice, replace the liq-

uid line prior to installing the 13HPX unit, See table 2.

Model

-018

-024

-030

-O36

-042

-048

-060

Table 2. Refrigerant Line Sets

Field

Connections

Liquid Vapor

Line Line

3/8 in. 3/4 in

(10 mm) (19 mm)

3/8 in. 7/8 in

(10 mm) (22 mm)

3/8 in, 1-1/8 in.

(10 mm) (29 mm)

Recommended Line Set

Liquid Vapor L15

Line Line Line Sets

3/8 in. 3/4 in L15-41

(10 (19 15ft,- 50ft.

mm) mm) (4.6 m - 15

3/8 in. 7/8 in L15-65

(10 (22 15ft.- 50 ft.

mm) mm) (4.6 m - 15

3/8 in. 1-1/8

in, Field

(10

mm) (29) Fabricated

NOTE -Units are designed for line sets of up to fifty feet (15

m); for longer lengths, consult the Lennox Refrigerant Pip-

ing Guide (Corp. 9351-L9). Select line set diameters from

table 2 to ensure that oil returns to the compressor.

INSTALLING REFRIGERANT LINE

Pay close attention to line set isolation during installation of

any heat pump or a/c system. When properly isolated from

building structures (walls, ceilings, floors), the refrigerant

lines will not create unnecessary vibration and subsequent

noises. Also, consider the following when placing and

installing a high-efficiency outdoor unit:

1. Placement--Some localities are adopting sound ordi-

nances based on the unit's noise level observed from

the adjacent property, not from the installation proper-

ty. Install the unit as far as possible from the property

line. When possible, do not install the unit directly out-

side a window. Glass has a very high level of sound

transmission. Figure 8 shows how to place the outdoor

unit and line set.

Install unit away

from windows.

Two 90 ° elbows

installed in line set will

line set vibration.

Figure 8. Unit Placement and Installation

2. Line Set Isolation--The following illustrations dem-

onstrate procedures which ensure proper refrigerant

line set isolation. Figure 9 shows how to install line sets

on horizontal runs. Figure 10 shows how to install line

sets on vertical runs. Figure 11 shows how to make a

transition from horizontal to vertical.

505325 03/08

Page 6

To hang line set from joist or rafter,

use either metal strapping material

or anchored heavy nylon wire ties.

STRAPPING MATERIAL

(Around vapor line only)

8 feet

FLOOR JOIST OR

ROOF RAFTER

WIRE TIE

(Around vapor line only)

TAPE OR

8 feet WIRE TIE

METAL FLOOR JOIST OR .

SLEEVE ROOF RAFTER

Strap the vapor line to the joist or

rafter at 8 ft. intervals then strap

the liquid line to the vapor line.

TAPE OR WIRE TIE

Figure 9. Refrigerant Line Sets: Installing Horizontal Runs

NOTE -Similar installation practices should be used if line set is to be installed on exterior of outside wall.

OUTSIDE WALL IMPORTANT - Refrigerant

lines must not contact wall. VAPOR LINE LI UID LINE

IMPORTANT!

Refrigerant

lines must

not contact

structure.

VAPOR LINE WRAPPED

CAULK

PVC PIPE FIBERGLASS

INSULATION

Figure 10. Refrigerant Line Sets: Installing Vertical Runs (new construction shown)

Page 7

13HPX SERIES

ANCHORED

HEAVY NYLON

WIRE TIE

AUTOMOTIVE

MUFFLER-TYPE

HANGER

WALL

STUD WALL

STUD

Strap Liquid Line

To Vapor Line

LIQUID LINE

Strap Liquid Line

To Vapor Line

LIQUID LINE

METAL SLEEVE VAPOR LINE (WRAPPED IN ARMAFLEX) VAPOR LINE -WRAPPED IN ARMAFLEX

Figure 11. Refrigerant Line Sets: Transition From Vertical To Horizontal

WARNING I 5, Install a field-provided thermal expansion valve (ap-proved for use with HFC-410A refrigerant) in the liquid

line at the indoor coil,

BRAZING CONNECTION PROCEDURE

1, Cut ends of the refrigerant lines square (free from

nicks or dents), Debur the ends. The pipe must remain

round, do not pinch end of the line.

2, Flow dry nitrogen through the refrigerant piping while

making line set connections; this prevents carbon de-

posits (oxidation) buildup on the inside of the joints be-

ing brazed. Such buildup may restrict refrigerant flow

through screens and metering devices. To do this:

• Flow_ulated nitrogen (at 1 to 2 psig) through the

refrigeration gauge set into the Schrader port con-

nection on the vapor service valve and out of the

Schrader port connection on the liquid service

valve. (Metering device [TXV and RFC] will allow

low pressure nitrogen to flow through the system.)

• While nitrogen is flowing, braze refrigerant line set

to the indoor and outdoor units, IMPORTANT." The

flow of nitrogen must have an escape path

other than through the joint to be brazed.

3, Use silver alloy brazing rods (5 or 6 percent minimum

silver alloy for copper-to-copper brazing or 45 percent

silver alloy for copper-to-brass or copper-to-steel

brazing) which are rated for use with HFC-410A refrig-

erant,

4. Wrap a wet cloth around the valve body and copper

tube stub to protect it from heat damage during braz-

ing, Wrap another wet cloth underneath the valve body

to protect the base paint,

NOTE -The tube end must stay bottomed in the fitting

during final assembly to ensure proper seating, seal-

ing and rigidity.

Page 8

505325 03/08

_WARNING

IMPORTANT

CAUTION

RECOVERY CYLINDER

Inverted HCFC-22 Cylinder

(Contains clean HCFC-22 to be

used for flushing)

EXISTING VAPOR LINE

VAPOR LINE

SERVICE VALVE

EXISTING LIQUID LINE LIQUID LINE

SERVICE VALVE

/ REOU,REDO. ank

SOME MACHINES.

Inlet

rDischarge

RECOVERY MACHINE

Low High

Pressure Pressure

NOTE - The inverted HCFC-22 cylinder must

contain at least the same amount of refrigerant

as was recovered from the existing system.

Figure 12. Flushing Connections

REQUIRED EQUIPMENT

You will need the following equipment in order to flush the

existing line set and indoor coil: two clean HCFC-22 recov-

ery bottles, an oilless recovery machine with a pump down

feature, and two sets of gauges (one for use with HCFC-22

and one for use with the HFC-410A).

FLUSHING PROCEDURE

1. Remove existing HCFC-22 refrigerant using the ap-

propriate procedure below.

If the existing outdoor unit is not equipped with

shut-off valves, or if the unit is not operational

AND you plan to use the existing HCFC-22 refrig-

erant to flush the system -

• Disconnect all power to the existing outdoor unit.

• Connect to the existing unit, a clean recovery cyl-

inder and the recovery machine according to the

instructions provided with the recovery machine.

• Remove all HCFC-22 refrigerant from the existing

system. Check gauges after shutdown to confirm

that the entire system is completely void of refrig-

erant.

• Disconnect the liquid and vapor lines from the ex-

isting outdoor unit.

If the existing outdoor unit is equipped with

manual shut-off valves AND you plan to use NEW

HCFC-22 refrigerant to flush the system -

• Start the existing HCFC-22 system in the cooling

mode and close the liquid line valve.

• Pump all of the existing HCFC-22 refrigerant back

into the outdoor unit. (It may be necessary to by-

pass the low pressure switches to ensure com-

plete refrigerant evacuation.)

• When the low side system pressures reach 0 psig,

close the vapor line valve.

• Disconnect all power to the existing outdoor unit.

Check gauges after shutdown to confirm that the

valves are not allowing refrigerant to flow back into

the low side of the system.

• Disconnect the liquid and vapor lines from the ex-

isting outdoor unit.

2. Remove the existing outdoor unit. Set the new

HFC-410A unit and follow the brazing connection pro-

cedure (see page 8) to make line set connections.

DO NOT install metering device at this time.

3. Make low voltage and line voltage connections to the

new outdoor unit. DO NOT turn on power to the unit

or open the outdoor unit service valves at this

time.

AIMPORTANT

4. Remove the existing refrigerant flow control orifice or

thermal expansion/check valve before continuing with

flushing procedures. The existing devices are not ap-

proved for use with HFC-410A refrigerant and may

prevent proper flushing, Use a field-provided fitting to

reconnect the lines.

5. Remove the pressure tap valve cores from the 13HPX

unit's service valves. Connect an HCFC-22 cylinder

with clean refrigerant to the vapor service valve. Con-

nect the HCFC-22 gauge set to the liquid line valve and

connect a recovery machine with an empty recovery

tank to the gauge set,

6. Set the recovery machine for liquid recovery and start

the recovery machine. Open the gauge set valves to

allow the recovery machine to pull a vacuum on the ex-

isting system line set and indoor coil.

7. Invert the cylinder of clean HCFC-22 and open its

valve to allow liquid refrigerant to flow into the system

through the vapor line valve. Allow the refrigerant to

pass from the cylinder and through the line set and the

indoor coil before it enters the recovery machine.

Page 9

13HPX SERIES

8. After all of the liquid refrigerant has been recovered,

switch the recovery machine to vapor recovery so that

all of the HCFC-22 vapor is recovered,

NOTE -A single system flush should remove all of the

mineral oil from the existing refrigerant lines and in-

door coil. A second flushing may be done (using clean

refrigerant) if insufficient amounts of mineral oil were

removed during the first flush. Each time the system

is flushed, you must allow the recovery machine

to pull a vacuum on the system at the end of the

procedure.

9. Close the valve on the inverted HCFC-22 drum and

the gauge set valves. Pump the remaining refrigerant

out of the recovery machine and turn the machine off,

10. Use dry nitrogen to break the vacuum on the refriger-

ant lines and indoor coil before removing the recovery

machine, gauges and HCFC-22 refrigerant drum. Re-

install pressure tap valve cores into 13HPX service

valves.

11. Install the provided check/expansion valve (approved

for use with HFC-410A refrigerant) in the liquid line at

the indoor coil.

13HPX units are used in check expansion valve (TXV) sys-

tems only, See the Lennox Engineering Handbook for ap-

proved TXV match-ups and application information.

NOTE -HFC-410A systems will not operate properly with

an HCFC-22 valve.

Check expansion valves equipped with Chatleff fittings are

available from Lennox. Refer to the Engineering Hand-

book for applicable check expansion valves for use with

specific match-ups, See table 3 for applicable check ex-

pansion valve kits,

Table 3. Indoor Check Expansion Valve Kits

Model Kit Number

13HPX-018, -024, -030, -036 49L24

13H PX-042, -048 49L25

13HPX-060 91M02

IMPORTANT

If you install a check expansion valve with an indoor coil

that includes a fixed orifice, remove the orifice before the

check expansion valve is installed. See figure 13 for instal-

lation of the check expansion valve.

/STRAINER

DISTRIBUTOR _"(_ LITQUBIDLINE

NOTE - If necessary, remove HCFC-22 flow control device (fixed

orifice/thermal expansion valve) from existing line set before instal-

ling HFC-410A approved expansion valve and o-ring,

Figure 13. Metering Device Installation

Manifold gauge sets used with systems charged with

HFC-410A refrigerant must be capable of handling the

higher system operating pressures, The gauges should be

rated for use with pressures of 0 - 800 on the high side and

a low side of 30" vacuum to 250 psi with dampened speed

to 500 psi. Gauge hoses must be rated for use at up to 800

psi of pressure with a 4000 psi burst rating,

The service valves (liquid line - figure 14, vapor line - figure

15) and gauge ports are used for leak testing, evacuating,

charging and checking charge, Each valve is equipped

with a service port which has a factory-installed Schrader

valve. A service port cap protects the Schrader valve from

contamination and serves as the primary leak seal.

SCHRADER

VALVE [OPEN TO

LINE SET WHEN

VALVE IS CLOSED

]FRONT SEATED)]

OUT-

STEM INSERT HEX

CAP

_TO

INDOOR

SERVICE COIL

PORT CAP ]VALVE FRON%SEATED)

Valve in closed position Valve in open position

Figure 14. Liquid Line Service Valve

TO ACCESS SCHRADER PORT:

1. Remove service port cap with an adjustable wrench,

2. Connect gauge to the service port,

3. When testing is completed, replace service port cap and

tighten finger tight; then tighten per table 1 (on page 2).

TO OPEN FRONT-SEATED SERVICE VALVES:

1, Remove stem cap with an adjustable wrench,

2. Use a service wrench with a hex-head extension

(3/16" for liquid-line valve sizes; 5/16" for vapor-line

valve sizes) to back the stem out counterclockwise as

far as it will go,

3. Replace the stem cap. Tighten finger tight; then tighten

per table 1 (on page 2).

TO CLOSE FRONT-SEATED SERVICE VALVES:

1. Remove the stem cap with an adjustable wrench.

505325 03/08

Page 10

2, Usea servicewrenchwitha hex-headextension

(3/16"forliquid-linevalvesizes;5/16"forvapor-line

valvesizes)to turnthestemclockwiseto seatthe

valve.Tightenitfirmly,

3, Replacethestemcap.Tightenfingertight;thentighten

pertable1(onpage2),

Vapor Line Ball Valve

Ball-typeservicevalves(seefigure15)functionthesame

wayastheothervalvesbutcannotberebuilt;if onefails,

replacewithanewvalve,Theballvalveisequippedwitha

serviceportwithafactory-installedSchradervalve.Aser-

viceportcapprotectstheSchradervalvefromcontamina-

tionandassuresa leak-freeseal,

STEM

CAP TO

OUTDOOR

USE ADJUSTABLE WRENCH _,,. STEM _(STEM COIL

TO OPEN: ROTATE STEM__.,__

COUNTER-CLOCKWISE 90° .

TO CLOSE: ROTATE STEM

CLOCKWISE 90 °.

(SHOWN

CLOSED)

INDOOR _ _""

COIL SERVICE

PORT CAP

Figure 15. Bali-Type Vapor Valve (Valve Closed)

USING AN ELECTRONIC LEAK DETECTOR

IMPORTANT

1, Connect a cylinder of HFC-410A to the center port of

the manifold gauge set.

2, With both manifold valves closed, open the valve on

the HFC-410A cylinder (vapor only).

3, Open the high pressure side of the manifold to allow

the HFC-410A into the line set and indoor unit. Weigh

in a trace amount of HFC-410A, [A trace amount is a

maximum of 2 ounces (57 g) or 3 pounds (31 kPa)

pressure,] Close the valve on the HFC-410A cylinder

and the valve on the high pressure side of the manifold

gauge set, Disconnect the HFC-410A cylinder,

4. Connect a cylinder dnitrogen with a pressure regulat-

ing valve to the center port of the manifold gauge set,

5. Connect the manifold gauge set high pressure hose to

the vapor valve service port. (Normally, the high pres-

sure hose is connected to the liquid line port; however,

connecting it to the vapor port better protects the man-

ifold gauge set from high pressure damage.)

6, Adjust the nitrogen pressure to 150 psig (1034 kPa),

Open the valve on the high side of the manifold gauge

set which will pressurize line set and indoor unit.

7, After a few minutes, open a refrigerant port to ensure

the refrigerant you added is adequate to be detected.

(Amounts of refrigerant will vary with line lengths.)

Check all joints for leaks. Purge nitrogen and

HFC-410A mixture, Correct any leaks and recheck,

After the line set has been connected to the indoor and out-

door units, check the line set connections and indoor unit

for leaks.

WARNING

_WARNING

Evacuating the system of noncondensables is critical for

proper operation of the unit. Noncondensables are defined

as any gas that will not condense under temperatures and

pressures present during operation of an air conditioning

system. Noncondensables and water vapor combine with

refrigerant to produce substances that corrode copper pip-

ing and compressor parts.

AIMPORTANT

Page 11

1, Connect manifold gauge set to the service valve ports

as follows:

•low pressure gauge to vapor line service valve

• high pressure gauge to liquid line service valve

2. Connect micron gauge.

3, Connect the vacuum pump (with vacuum gauge) to

the center port of the manifold gauge set,

4, Open both manifold valves and start the vacuum

pump.

5, Evacuate the line set and indoor unit to an absolute

pressure of 23,000 microns (29,01 inches of mercu-

ry). During the early stages of evacuation, it is desir-

13HPX SERIES

able to close the manifold gauge valve at least once to

determine if there is a rapid rise in absolute pressure,

A rapid rise in pressure indicates a relatively large

leak, If this occurs, repeat the leak testing procedure,

NOTE -The term absolute pressure means the total

actual pressure within a given volume or system,

above the absolute zero of pressure. Absolute pres-

sure in a vacuum is equal to atmospheric pressure mi-

nus vacuum pressure.

6, When the absolute pressure reaches 23,000 microns

(29.01 inches of mercury), close the manifold gauge

valves, turn off the vacuum pump and disconnect the

manifold gauge center port hose from vacuum pump.

Attach the manifold center port hose to a nitrogen cyl-

inder with pressure regulator set to 150 psig (1034

kPa) and purge the hose. Open the manifold gauge

valves to break the vacuum in the line set and indoor

unit, Close the manifold gauge valves,

WARNING I

NOTE -After the system has been evacuated and before

completing all the remaining start-up steps, this is the ideal

time to adjust the amount of refrigerant made necessary by

line set length difference and by the specific indoor unit

matchup. Skip to the paragraph "Setup for Checking and

Adding Charge" on Page 13 to setup for charging and for

determine if charge is needed; adjust the charge accord-

ingly

3, Open the liquid line and vapor line service valves

(counterclockwise) to release refrigerant charge (con-

tained in outdoor unit) into the system,

4, Replace stem caps and tighten finger tight; then tighten

per table 1 (on page 2),

5, Check voltage supply at the disconnect switch. The

voltage must be within the range listed on the unit

nameplate. If not, do not start the equipment until the

power company has been consulted and the voltage

condition has been corrected.

6, Set the thermostat for a cooling demand, turn on pow-

er to indoor blower unit and close the outdoor unit dis-

connect to start the unit,

7, Recheck voltage while the unit is running. Power must

be within range shown on the nameplate,

7. Shut off the nitrogen cylinder and remove the manifold

gauge hose from the cylinder. Open the manifold

gauge valves to release the nitrogen from the line set

and indoor unit.

8. Reconnect the manifold gauge to the vacuum pump,

turn the pump on, and continue to evacuate the line set

and indoor unit until the absolute pressure does not

rise above 500 microns (29.9 inches of mercury) within

a 20-minute period after shutting off the vacuum pump

and closing the manifold gauge valves.

9. When the absolute pressure requirement above has

been met, disconnect the manifold hose from the vac-

uum pump and connect it to an upright cylinder d

HFC-410A refrigerant. Open the manifold gauge

valves to break the vacuum from 1 to 2 psig positive

pressure in the line set and indoor unit, Close manifold

gauge valves and shut off the HFC-410A cylinder and

remove the manifold gauge set,

AIMPORTANT

1. Check that fan rotates freely.

2. Inspect all factory and field-installed wiring for loose

connections.

This system is charged with HFC-410A refrigerant which

operates at much higher pressures than HCFC-22. The

recommended check expansion valve is approved for use

with HFC-410A. Do not replace it with a valve that is de-

signed to be used with HCFC-22. This unit is NOT ap-

proved for use with coils that include metering orifices or

capillary tubes,

The unit is factory-charged with the amount of HFC-410A

refrigerant indicated on the unit rating plate, This charge is

based on a matching indoor coil and outdoor coil with a 15

foot (4,6 m) line set. A blank space is provided on the unit

rating plate to list the actual field charge,

AIMPORTANT

NOTE -Be sure that filters and indoor and outdoor coils are

clean before testing.

COOLING MODE INDOOR AIRFLOW CHECK

Check airflow using the Delta-T (DT) process (figure 16),

HEATING MODE INDOOR AIRFLOW CHECK

Blower airflow (CFM) may be calculated by energizing

electric heat and measuring:

• temperature rise between the return air and supply air

temperatures at the indoor coil blower unit,

• measuring voltage supplied to the unit,

• measuring amperage being drawn by the heat unit(s),

505325 03/08

Page 12

Then,applythemeasurementstakeninfollowingformula

todetermineCFM:

Amps x Volts x 3.41

CFM =1.08 x Temperature rise (F)

SETUP FOR CHARGING

Connect the manifold gauge set to the unit's service ports

(see figure 17):

•low pressure gauge to vapor service port

• high pressure gauge to liquid service port

Close manifold gauge set valves. Connect the center man-

ifold hose to an upright cylinder of HFC-410A,

CALCULATING CHARGE

If the system is void of refrigerant, first, locate and repair

any leaks and then weigh in the refrigerant charge into the

unit, To calculate the total refrigerant charge:

Amount Adjust amt. for Additional charge

specified variation in specified per

on line set length indoor unit matchup Total

nameplate (table in figure 18) (tables 4 through 10 charge

+ + =

Temp. ]

of air I80

entering j= I 78

indoor _1 ==

IcoiI°F _1 .u

IWet-bulb °F

I)T

24 24 24 23 23 22 22 22 20 19 18 17 16 15

23 23 23 22 22 21 21 20 19 18 17 16 15 14

22 22 22 21 21 20 19 19 18 17 16 15 14 13

21 21 21 20 19 19 18 17 16 16 15 14 13 12

20 20 19 18 17 17 161L_15 14 13 12 11 10

19 19 18 18 17 17 16 15 15 14 13 12 11 10

57 58 59 60 61 62 63 64 65 66 67 68 69 70 I

DRY

BULB

iNDOOR 1 WET

COIL BULB

Step 1. Determine the desired DT--Measure entering air tempera-

ture using dry bulb (A) and wet bulb (B) DT is the intersecting value of

A and B in the table (see triangle).

Step 2. Find temperature drop across coil--Measure the coil's dry

bulb entering and leaving air temperatures (A and C). Temperature

Drop Formula: (TDrop) = A minus C.

Step 3. Determine if fan needs adjustment--If the difference be-

tween the measured TDrop and the desired ])T (TDropiDT) is within

+3°, no adjustment is needed, See examples: Assume ])T = 15 and A

temp. = 72 °, these C temperatures would necessitate stated actions:

C° TDrop- DT = °F ACTION

53°19 - 15 = 4 Increase the airflow

58° 14 - 15 = -1 (within +3 ° range) no change

62°10 - 15 = -5 Decrease the airflow

Step 4. Adjust the fan speed--See indoor unit instructions to in-

crease/decrease fan speed

Changing air flow affects all temperatures; recheck temperatures to

confirm that the temperature drop and DT are within +3o

Figure 16. Checking Indoor Airflow over Evaporator Coil using Delta-T (DT) Chart

OUTDOOR UNIT

CHECK

EXPANSION VALVE __,.,.,.,._

LOW HUGH

PRESSURE PRESSURE I

LIQUID

LINE I

VALVE

DISTRIBUTOR

0_ BIFLO

FILTER /

DRIER OUTDOOR

CO,L

MUFFLER

SERV

COMPRESSOR

NOTE -ARROWS INDICATE DIRECTION

OF REFRIGERANT FLOW

REVERSING VALVE

Q APOR

LINE

VALVE

CHECK EXPANSION VALVE i

NOTE- USE GAUGE PORTS ON VAPOR LINE VALVE AND LIQUID VALVE FOR EVACUATING REFRIGERANT

LINES AND INDOOR COIL. USE VAPOR GAUGE PORT TO MEASURE VAPOR PRESSURE DURING CHARGING.

INDOOR_INI

/,-'-1

:11"-"""""4

--'ll"l I I

INDOOR

COIL

Figure 17. 13HPX Cooling Cycle (Showing Gauge Manifold Connections)

Page13

13HPX SERIES

WE)GH )N

RefrigerantCharge per Line Set Length

Liquid Line Ounces per 5 feet (g per 1.5 m)

Set Diameter adjust from 15feet (4.6 m) lineset*

3t8" (9.5 mm) 3 ounce per 5' (85 g per 1.5 m)

NOTE - *If line length is greater than 15 ft. (4.6 m), add this

amount. If line length is less than 15 ft. (4.6 m), subtract this

amount.

LENNOX

HIm!!)HiilII|

1. Check Liquid and suction line pressures

2. Compare unit pressures with table 12,

Normal Operating Pressures.

3. Conduct leak check; evacuate as

previously outlined.

4. Weigh in the unit nameplate charge plus

any charge required for line set differences

over feet,

This nameplate is for illustration purposes

only. Go to actual nameplate on outdoor

unit for charge information.

Figure 18. Using Weigh In Method

SUBCOOUNG 1

):))_);),

USE COOLING

MODE

60°F {15 °) --

USE HEATING

MODE

SATo

LIQ o -

SC o =

Check the airflow as illustrated in figure 16 to be sure the indoor airflow is as

required. (Make any air flow adjustments before continuing with the following

procedure.)

Measure outdoor ambient temperature; determine whether to use cooling mode

or heating mode to check charge.

Connect gauge set.

Check Liquid and Vapor line pressures. Compare pressures with Normal

Operating Pressures table 11, (The reference table is a general guide. Expect

minor pressure variations. Significant differences may mean improper charge or

other system problem.)

Set thermostat for heat/cool demand, depending on mode being used:

Using cooling mode--When the outdoor ambient temperature is 60°F (15°C) and

above. Target subcooling values in table below are based on 70 to 80°F (21-27°C)

indoor return air temperature; if necessary, operate heating to reach that

temperature range; then set thermostat to cooling mode setpoint to 68°F (20°C).

When pressures have stabilized, continue with step 6.

Using heating mode--When the outdoor ambient temperature is below 60°F (15°C).

Target subcooling values in table below are based on 65-75°F (18-24°C)indoor

return air temperature; if necessary, operate cooling to reach that temperature range;

then set thermostat to heating mode setpoint to 77°F (25°C). When pressures have

stabilized, continue with step 6.

6 Read the liquid line temperature; record in the LIQ° space.

7 Read the liquid line pressure; then find its corresponding temperature in the

temperature/pressure chart listed in table 12 and record it in the SAT° space.

8 Subtract LIQ° temp. from SAT° temp. to determine subcooling; record it in SC°space.

9 Compare SC° results with table below, being sure to note any additional charge for

line set and/or match-up.

10 If subcooling value is greater than shown in tables 4 through 10 for the applicable unit,

remove refrigerant; if less than shown, add refrigerant.

11 If refrigerant is added or removed, repeat steps 6 through 10 to verify charge.

Figure 19. Using Subcooling Method

505325 03/08

Page 14

Table 4. 13HPX-018

Target *Add

Subcooling charge

INDOOR MATCHUPS Heat Cool

(+5OF) (+1OF) Ib oz

CBX26UH-018 11 9 0 3

CBX32MV-O 18/024-230 12 12 O O

CBX32MV-024/030-230 12 19 1 1

Table 5. 13HPX-024

Target *Add

Subcooling charge

INDOOR MATCHUPS Heat Cool

(+5OF) (+1OF) Ib oz

CBX26UH-024 20 16 1 O

CB3OU-31 14 15 1 5

CBX32M-030 14 15 1 5

CBX32MV-O 18/024 14 15 O 9

CBX32MV-024/030 14 15 1 5

CH33-25B 14 15 O O

CH33-36A 14 15 O 8

CH33-36B 14 15 O O

CH33-36C 14 15 O 14

CR33-30/36 20 16 1 O

CX34-25 14 15 O 9

CX34-31 14 15 1 5

CX34-36 14 15 O 4

Table 6. 13HPX-030

Target *Add

Subcooling charge

INDOOR MATCHUPS Heat Cool

(+5OF) (+1OF) Ib oz

CBX26UH-030 19 6 1 7

CBX26UH-036 25 4 O 11

CBX27UH-030-230 15 4 O 11

CBX27UH-036-230 15 4 O 11

CBX32M-030 -036, -042 15 4 O 11

CBX32MV-024/030, -036 15 4 O 11

CH33-25B 15 4 O O

CH33-31B 15 4 O 11

CH33-36A 15 4 O 8

CH33-36B 15 4 O O

CH33-36C 15 4 O 11

CH33-42 15 4 O 11

CR33-30/36 20 4 O 11

CX34-25, -31 15 4 O 11

CX34-36 28 3 O O

CX34-38 SN# 6007 and after 4 4 O 11

CX34-38 before SN# 6007 20 4 O 11

CX34-42 28 3 O O

Table 7. 13HPX-036

Target

Subcooling

INDOOR MATCHUPS Heat Cool

(+5°F) (+I°F)

CBX26UH-036 14 10

CBX27UH-036-230 10 5

CBX27UH-042-230 10 10

CBX32M-036, -042 10 5

CBX32MV-036-230 10 5

CH33-31A, -31B 10 5

CH33-36B 10 5

CH33-36C 10 5

CH33-42 10 5

CH33-44/48B 10

C H33-48C 10 5

*Amount of charge required in additional to charge shown

plate. (Remember to consider lineset length difference.)

*Add

charge

Ib oz

2 7

2 13

2 7

2 8

0 0

0 5

2 8

5 2 10

2 10

on unit name-

Target *Add

Subcooling charge

INDOOR MATCHUPS Heat Cool

(+5OF) (+1OF) Ib oz

CR33-30/36 25 5 0 6

CR33-48 25 5 2 8

CR33-50/60 10 5 2 10

CX34-36B 10 5 0 1

CX34-38 SN# 6007 and after 5 5 2 7

CX34-38 before SN# 6007 10 5 2 7

CX34-42B 10 5 0 1

CX34-44/48B 10 5 2 7

Table 8. 13HPX-042

Target *Add

Subcooling charge

INDOOR MATCHUPS Heat Cool

(+5OF) (+1OF) Ib oz

CBX26UH-042 26 5 1 1

CBX26UH-048 10 12 4 5

CBX27UH-042-230 10 6 4 5

CBX27UH-048-230 10 6 4 5

CBX32M-036, -042 15 5 O O

CBX32MV-036 15 5 O O

CBX32MV-048-230 10 6 4 5

CH33-43C, -48C 10 6 1 1

CH33-49C, -50/60C 10 6 4 5

CH33-6OD 10 6 2 6

CR33-48 32 5 O 5

CR33-50/60 32 9 2 6

CR33-60 32 9 2 6

CX34-43C 10 6 1 1

CX34-49 10 6 3 7

CX34-50/60C 10 6 1 1

Table 9. 13HPX-048

Target *Add

Subcooling charge

INDOOR MATCHUPS Heat Cool

(+5OF) (+1OF) Ib oz

CBX26UH-048 11 11 1 7

CBX26UH-060 24 18 2 7

CBX27UH-048-230 11 11 1 3

CBX27UH-060-230 24 18 2 7

CBX32M-048 11 11 1 3

CBX32M-060 11 11 1 3

CBX32MV-048 11 11 1 3

CBX32MV-060-230 11 11 1 3

CH33-43C 18 7 O O

CH33-49C, -50/60C 11 11 1 3

CH33-6OD 11 11 O 9

CH33-62D 11 11 1 10

CR33-50/60 25 7 O 9

CR33-60 25 7 O 9

CX34-49 11 11 1 1

CX34-6OD 11 11 O 9

Table 10. 13HPX-060

Target *Add

Subcooling charge

INDOOR MATCHUPS Heat Cool

(+5OF) (+1OF) Ib oz

CBX26UH-060 8 11 1 7

CBX27UH-060-230 10 9 O 13

CBX32MV-060 10 9 O O

CBX32MV-068 10 9 O 9

CH33-6OD 10 9 O O

CH33-62D 10 9 O 11

CX34-62D 10 9 O 6

Page15

13HPX SERIES

Table 11. Normal Operating Pressures - Liquid +10 & Vapor +5 PSIG*

Ak IMPORTANT

13HPX-018 13HPX-024 13HPX-030 13HPX-036 13HPX-042 13HPX-048 13HPX-060

°F(°C)** Liq /Vap Liq /Vap Liq /Vap Liq /Vap Liq /Vap Liq /Vap Liq /Vap

Cooling

65 (18) 234/142 258/140 238/137 260/136 231 /135 246/134 256/ 116

75 (24) 273 /144 299 /142 278 /138 303 /140 267 /138 286 /136 298 /123

85 (29) 316 /145 347 /145 322 /140 348 /143 314 /140 330 /138 345 /131

95 (35) 365 /148 399 /148 369 /143 398 /145 367 /143 379 /140 395 /135

105 (41) 421 /151 460 /150 425 /144 452 /148 414 /146 432 /143 450 /138

115 (45) 492 /152 534 /152 487 /147 512 /151 473 /148 492 /146 512 /141

Heating

60 (15) 325 /130 353 /130 328 /127 350 /131 360 /135 361 /130 370 /127

50(10) 309/114 330/109 313/ 110 331 /107 340/ 110 334/100 350/102

40 (4) 293 /96 307 /90 297 /93 314 /88 324 /91 302 /92 331 /81

30 (-1) 278 /79 291 /75 284 /77 290 /74 307 /73 300 /73 309 /62

20 (-7) 264 /65 276 /59 271 /62 283 /58 298 /61 286 /60 300 /56

*These are most-popular-match-up pressures. Indoor match up, indoor air quafity, and indoor load cause pressures to vary

**Temperature of the air entering the outside coil.

505325 03/08

Page 16

Table 12. HFC-410A Temp. (°F) - Pressure (Psig)

°F Psig °F Psig °F Psig °F Psig

-40 10.1 21 80.5 56 158.2 91 278.2

-35 13.5 22 82.3 57 161 92 282.3

-30 17.2 23 84.1 58 163.9 93 286.5

-25 21.4 24 85.9 59 166.7 94 290.8

-20 25.9 25 87.8 60 169.6 95 295.1

-18 27.8 26 89.7 61 172.6 96 299.4

-16 29.7 27 91.6 62 175.4 97 303.8

-14 31.8 28 93.5 63 178.5 98 308.2

-12 33.9 29 95.5 64 181.6 99 312.7

-10 36.1 30 97.5 65 184.3 100 317.2

-8 38.4 31 99.5 66 187.7 101 321.8

-6 40.7 32 100.8 67 190.9 102 326.4

-4 43.1 33 102.9 68 194.1 103 331

-2 45.6 34 105 69 197.3 104 335.7

0 48.2 35 107.1 70 200.6 105 340.5

1 49.5 36 109.2 71 203.9 106 345.3

2 50.9 37 111.4 72 207.2 107 350.1

3 52.2 38 113.6 73 210.6 108 355

4 53.6 39 115.8 74 214 109 360

5 55 40 118 75 217.4 110 365

6 56.4 41 120.3 76 220.9 111 370

7 57.9 42 122.6 77 224.4 112 375.1

8 59.3 43 125 78 228 113 380.2

9 60.8 44 127.3 79 231.6 114 385.4

10 62.3 45 129.7 80 235.3 115 390.7

11 63.9 46 132.2 81 239 116 396

12 65.4 47 134.6 82 242.7 117 401.3

13 67 48 137.1 83 246.5 118 406.7

14 68.6 49 139.6 84 250.3 119 412.2

15 70.2 50 142.2 85 254.1 120 417.7

16 71.9 51 144.8 86 258 121 423.2

17 73.5 52 147.4 87 262 122 428.8

18 75.2 53 150.1 88 266 123 434.5

19 77 54 152.8 89 270 124 440.2

20 78.7 55 155.5 90 274.1 125 445.9

The outdoor unit and indoor blower cycle on demand from

the room thermostat. If the thermostat blower switch is in

the ON position, the indoor blower operates continuously.

FILTER DRIER

The unit is equipped with a large-capacity biflow filter drier

which keeps the system clean and dry. If replacement is

necessary, order another of the same design and capacity.

The replacement filter drier must be suitable for use with

HFC-410A refrigerant.

LOW PRESSURE SWITCH

The 13HPX is equipped with an auto-reset low pressure

switch which is located on the vapor line. The switch shuts

off the compressor when the vapor pressure falls below the

factory setting. This switch, which is ignored during defrost

operation, closes at pressures at or above 55 psig and

opens at 25 psig. It is not adjustable.

HIGH PRESSURE SWITCH

The 13HPX is equipped with an auto-reset high pressure

switch (single-pole, single-throw) which is located on the

liquid line, The switch shuts off the compressor when dis-

charge pressure rises above the factory setting. The

switch is normally closed and is permanently adjusted to

trip (open) at 590 _+10 psig (4412 _+69 kPa),

NOTE -A Schrader core is under the pressure switches.

The 13HPX defrost system includes two components: a

defrost thermostat and a defrost control.

DEFROST THERMOSTAT

The defrost thermostat is located on the liquid line between

the check/expansion valve and the distributor. When de-

frost thermostat senses 42°F (5.5°C) or cooler, the ther-

mostat contacts close and send a signal to the defrost con-

trol board to start the defrost timing. It also terminates

defrost when the liquid line warms up to 70°F (21°C).

DEFROST CONTROL

The defrost control board includes the combined functions

of a time/temperature defrost control, defrost relay, diag-

nostic LEDs and terminal strip for field wiring connections.

See figure 20.

FIELD SELECT

TIMING PINS

TEST

PINS

COMPRESSOR

DELAY PINS

REVERSING

VALVE

LOW PRESSURE

SWITCH

DEFROST _"

THERMOSTAT

HIGH PRESSURE

SWITCH

ODSl

ODS2

0-0UT P2

Bt_€

YFOUT

DIAGNOSTIC

LEDS

24V TERMINAL

STRIP

CONNECTIONS

Figure 20.13HPX Outdoor Unit Defrost Control

Board

The control provides automatic switching from normal

heating operation to defrost mode and back. During com-

pressor cycle (call for defrost), the control accumulates

compressor run times at 30-, 60-, or 90-minute field-ad-

justable intervals. If the defrost thermostat is closed when

the selected compressor run time interval ends, the defrost

relay is energized and defrost begins.

DEFROST CONTROL TIMING PINS

Each timing pin selection provides a different accumu-

lated compressor run time period for one defrost cycle.

This time period must occur before a defrost cycle is initi-

ated, The defrost interval can be adjusted to 30 (T1), 60

Page 17

13HPX SERIES

(T2), or 90 (T3) minutes (see figure 20), The defrost tim-

ing jumper is factory-installed to provide a 60-minute de-

frost interval. If the timing selector jumper is not in place,

the control defaults to a 90-minute defrost interval. The

maximum defrost period is 14 minutes and cannot be ad-

justed.

A TEST option is provided for troubleshooting, The TEST

mode may be started any time the unit is in the heating

mode and the defrost thermostat is closed or jumper-

ed. If the jumper is in the TEST position at power-up, the

control will ignore the test pins, When the jumper is placed

across the TEST pins for two seconds, the control will en-

ter the defrost mode, If the jumper is removed before an

additional 5-second period has elapsed (7 seconds total),

the unit will remain in defrost mode until the defrost ther-

mostat opens or 14 minutes have passed. If the jumper is

not removed until after the additional 5-second period has

elapsed, the defrost will terminate and the test option will

not function again until the jumper is removed and re-ap-

plied,

COMPRESSOR DELAY

The defrost board has a field-selectable function to reduce

occasional sounds that may occur while the unit is cycling

in and out of the defrost mode. The compressor will be

cycled off for 30 seconds going in and out of the defrost

mode when the compressor delay jumper is removed.

NOTE -The 30-second compressor feature is ignored

when jumpering the TEST pins.

TIME DELAY

The timed-off delay is five minutes long. The delay helps to

protect the compressor from short-cycling in case the pow-

er to the unit is interrupted or a pressure switch opens, The

delay is bypassed by placing the timer select jumper

across the TEST pins for 0,5 seconds,

Pressure Switch Circuit

The defrost control incorporates two pressure switch cir-

cuits. The high pressure switch ($4) is factory-connected

to the board's Ht PS terminals (see figure 20). The board

also includes a low pressure, or loss-of-charge-pressure,

switch ($87). Switches are shown in wiring diagram (figure

5, page 5) and in figure 20.

During a single demand cycle, the defrost control will lock

out the unit after the fifth time that the circuit is interrupted

by any pressure switch wired to the control board. In addi-

tion, the diagnostic LEDs will indicate a locked-out pres-

sure switch after the fifth occurrence of an open pressure

switch (see Table 13). The unit will remain locked out until

power to the board is interrupted, then re-established or

until the jumper is applied to the TEST pins for 0.5 sec-

onds.

NOTE -The defrost control board ignores input from the

low-pressure switch terminals as follows:

•during the TESTmode,

•during the defrost cycle,

•during the 90-second start-up period,

• and for the first 90 seconds each time the reversing

valve switches heat/cool modes.

Diagnostic LEDs

The defrost board uses two LEDs for diagnostics. The

LEDs flash a specific sequence according to the condition.

Table 13. Defrost Control Board Diagnostic LED

Mode Green LED (DS2) Red LED (DS1)

No power to con- OFF OFF

trol

Normal operation /Simultaneous Slow FLASH

power to control

Anti-short cycle Alternating Slow FLASH

lockout

Low pressure OFF Slow FLASH

switch fault

Low pressure OFF ON

switch lockout

High pressure Slow FLASH OFF

switch fault

High pressure ON OFF

switch lockout

kWARNING

Maintenance and service must be performed by a qualified

installer or service agency. At the beginning of each cool-

ing season, the system should be checked as follows:

OUTDOOR UNIT

1, Clean and inspect outdoor coil (may be flushed with a

water hose). Ensure power is off before cleaning.

2, Outdoor unit fan motor is pre-lubricated and sealed,

No further lubrication is needed.

3, Visually inspect all connecting lines, joints and coils for

evidence of oil leaks.

4, Check all wiring for loose connections,

5. Check for correct voltage at unit (unit operating),

6, Check amp draw on outdoor fan motor.

Unit nameplate Actual

7, Inspect drain holes in coil compartment base and

clean if necessary,

NOTE -If insufficient heating or cooling occurs, the unit

should be gauged and refrigerant charge should be

checked.

INDOOR COIL

1. Clean coil if necessary.

2, Check connecting lines, joints and coil for evidence of

oil leaks,

3. Check condensate line and clean if necessary,

INDOOR UNIT

1. Clean or change filters,

2, Lennox blower motors are prelubricated and permanent-

ly sealed, No more lubrication is needed,

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505325 03/08

3. Adjust blower speed for cooling, Measure the pressure

drop over the coil to determine the correct blower CFM

Refer to the unit information service manual for pressure

drop tables and procedure.

4. Belt Drive Blowers - Check belt for wear and proper

tension,

5, Check all wiring for loose connections.

6. Check for correct voltage at unit, (blower operating)

7. Check amp draw on blower motor.

Motor nameplate Actual

Refer to the Engineering Handbook for optional accesso-

ries that may apply to this unit, The following may or may

not apply:

• Loss of Charge Kit

• Compressor Monitor

• Compressor Crankcase Heater

• Hail Guards

• Mounting Bases

• Stand-off Kit

• Sound Cover

• Low Ambient Kit

• Monitor Kit

• Mild Weather Kit

In order to ensure peak performance, your system must be

properly maintained. Clogged filters and blocked airflow

prevent your unit from operating at its most efficient level,

1. Ask your Lennox dealer to show you where your indoor

unit's filter is located. It will be either at the indoor unit

(installed internal or external to the cabinet) or behind

a return air grille in the wall or ceiling. Check the filter

monthly and clean or replace it as needed.

2. Replace disposable filters with a filter of the same type

and size,

NOTE -If you are unsure about the filter you need for

your system, carl your Lennox dealer for assistance,

AIMPORTANT

3. Many indoor units are equipped with reusable foam fil-

ters, These filters can be cleaned with a mild soap and

water solution. Rinse the filter thoroughly and let it dry

completely before it is returned to the unit or grille,

NOTE -The filter and all access panels must be in

place any time the unit is in operation.

4. Some systems are equipped with an electronic air

cleaner, designed to remove the majority of airborne

particles from the air passing through the cleaner. If

your system is so equipped, ask your dealer for main-

tenance instructions.

Inspect and clean indoor coil, The indoor evaporator

coil is equipped with a drain pan to collect condensate

formed as your system removes humidity from the in-

side air. Have your dealer show you the location of the

drain line and how to check for obstructions. (This

would also apply to an auxiliary drain, if installed.)

AIMPORTANT

6. Inspect and clean outdoor coil:

• Make sure no obstructions restrict airflow to the

outdoor unit. Leaves, trash or shrubs crowding the

unit cause the outdoor unit to work harder and use

more energy. Keep shrubbery trimmed away from

the unit and periodically check for debris which

collects around the unit.

• The outdoor coil may require frequent cleaning

(depending on environmental conditions). Clean

the outdoor coils with an unpressurized water

hose to remove surface contaminants and debris.

• If necessary, clean the outdoor coil more frequent-

ly, especially if it is exposed to substances which

are corrosive or which block airflow across the coil

(ie, pet urine, cottonwood seeds, etc.).

HEAT PUMP OPERATION

Your new Lennox heat pump has several characteristics

that you should be aware of:

• Heat pumps satisfy heating demand by delivering

large amounts of warm air into the living space, This

is quite different from gas- or oil-fired furnaces or an

electric furnace which deliver lower volumes of consid-

erably hotter air to heat the space,

• Do not be alarmed if you notice frost on the outdoor coil

in the winter months. Frost develops on the outdoor

coil during the heating cycle when temperatures are

below 45°F (7°C). An electronic control activates a de-

frost cycle lasting 5 to 15 minutes at preset intervals

to clear the outdoor coil of the frost,

• During the defrost cycle, you may notice steam rising

from the outdoor unit. This is a normal occurrence. The

thermostat may engage auxiliary heat during the de-

frost cycle to satisfy a heating demand; however, the

unit will return to normal operation at the conclusion of

the defrost cycle.

IN CASE OF EXTENDED POWER OUTAGE...

The heat pump may be equipped with a compressor crank-

case heater which protects the compressor from refriger-

ant "slugging" during cold weather operation.

Page19

13HPX SERIES

If power to your unit has been interrupted for several hours

or more, set the room thermostat selector to the "Emer-

gency Heat" setting to obtain temporary heat without the

risk of serious damage to the heat pump.

In Emergency Heat mode, all heating demand is satisfied

by auxiliary heat; heat pump operation is locked out. After a

six-hour compressor crankcase "warm-up" period, the

thermostat can be switched to the "Heat" setting and nor-

mal heat pump operation may resume.

Though your thermostat may vary somewhat from the de-

scription below, its operation will be similar.

TEMPERATURE SETTING LEVERS

Most heat pump thermostats have two temperature selec-

tor levers: one for heating and one for cooling. Set the lev-

ers or dials to the desired temperature setpoints for both

heating and cooling. Avoid frequent temperature adjust-

ment; turning the unit off and back on before pressures

equalize puts stress on the unit compressor.

FAN SWITCH

In AUTO or INT (intermittent) mode, the blower operates

only when the thermostat calls for heating or cooling. This

mode is generally preferred when humidity control is a

priority. The ON or CONT mode provides continuous in-

door blower operation, regardless of whether the com-

pressor or auxiliary heat are operating. This mode is re-

quired when constant air circulation or filtering is desired.

SYSTEM SWITCH

Set the system switch for heating, cooling or auto opera-

tion. The auto mode allows the heat pump to automatically

switch from heating mode to cooling mode to maintain pre-

determined comfort settings. Many heat pump thermo-

stats are also equipped with an emergency heat mode

which locks out heat pump operation and provides tempo-

rary heat supplied by the auxiliary heat.

INDICATING LIGHT

Most heat pump thermostats have an amber light which in-

dicates when the heat pump is operating in the emergency

heat mode.

TEMPERATURE INDICATOR

Temperature indicator displays actual room temperature.

PROGRAMMABLE THERMOSTATS

Your Lennox system may be controlled by a program-

mable thermostat. These thermostats provide the added

feature of programmable time-of-day setpoints for both

heating and cooling. Refer to the user's information manu-

al provided with your thermostat for operation details.

PRESERVlCE CHECK

If your system fails to operate, check the following before

calling for service:

• Make sure all electrical disconnect switches are ON.

• Make sure the room thermostat temperature selector

AND the system switch are properly set.

• Replace any blown fuses, or reset circuit breakers.

• Make sure unit access panels are in place.

• Make sure air filter is clean.

• Locate and record unit model number before calling.

Job Name

Job Location

Installer

Unit Model No.

Nameplate Voltage

Rated Load Ampacity

Maximum Fuse or Circuit Breaker

Electrical Connections Tight? _]

Indoor Blower RPM

Discharge Pressure __

Serial No.

Job no. Date

City State

Service Technician

Compressor

Indoor Filter clean?

S.P. Drop Over Indoor (Dry)

Vapor Pressure

Outdoor Fan

Supply Voltage (Unit Off)

Outdoor Coil Entering Air Temp.

Refrigerant Charge Checked?

es! _ Fu!!yOpened? _ CapsT!gh!? ...................................................................._ ...................... Thermostat

Votage Wth Compressor Operat ng Ca brated? _1 Properly Set? _1 Level? _1

505325 03/08

Page 20

LENNOX Air Conditioner/heat Pump(outside Unit) Manual L0806422

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