Lennox XPG20 User manual

06/09 506238−01

*2P0609* *P506238-01*

Page 1

E2009 Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

WARNING

Improper installation, adjustment, alteration, service

or maintenance can cause personal injury, loss of life,

or damage to property.

Installation and service must be performed by a

licensed professional installer (or equivalent) or a

service agency.

CAUTION

Physical contact with metal edges and corners

while applying excessive force or rapid motion can

result in personal injury. Be aware of, and use

caution when working near these areas during

installation or while servicing this equipment.

IMPORTANT

The Clean Air Act of 1990 bans the intentional

venting of refrigerant (CFCs, HCFCs AND HFCs) as

of July 1, 1992. Approved methods of recovery,

recycling or reclaiming must be followed. Fines

and/or incarceration may be levied for

noncompliance.

IMPORTANT

This unit must be matched with an indoor coil as

specified in Lennox’ Engineering Handbook.

Coils previously charged with HCFC−22 must be

flushed.

INSTALLATION

INSTRUCTIONS

Dave Lennox Signature®

Collection XPG20

SunSourcetComfort

System

SOLAR ASSIST HEAT PUMPS

506238−01

06/09

Supersedes 05/09

Table of Contents

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

Field Supplied Components 2. . . . . . . . . . . . . . . . . . . . .

Unit Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . .

Control Panel Parts Arrangement 3. . . . . . . . . . . . . . . .

Shipping and Packing List 4. . . . . . . . . . . . . . . . . . . . . .

System Overview 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Gauge Set 4. . . . . . . . . . . . . . . . . . . . . . . . . .

Recovering Refrigerant from Existing System 6. . . . .

Removing Existing Outdoor Unit 6. . . . . . . . . . . . . . . . .

Positioning New Outdoor Unit 7. . . . . . . . . . . . . . . . . . .

Removing and Installing Panels 8. . . . . . . . . . . . . . . . .

New or Replacement Line Set 9. . . . . . . . . . . . . . . . . . .

Brazing Connections 11. . . . . . . . . . . . . . . . . . . . . . . . . . .

Flushing the System 13. . . . . . . . . . . . . . . . . . . . . . . . . . .

Leak Testing the System 15. . . . . . . . . . . . . . . . . . . . . . .

Evacuating the System 17. . . . . . . . . . . . . . . . . . . . . . . . .

Servicing Unit Delivered Void of Charge 18. . . . . . . . . .

Electrical 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Solar Module Setup and Connections 20. . . . . . . . . . . .

Unit Start−Up 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Testing Charge 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adding or Removing Refrigerant 26. . . . . . . . . . . . . . . .

System Operations 29. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lennox System Operation Monitor (LSOM) 29. . . . . . .

LSOM Module and System Troubleshooting LEDs 30.

Defrost System 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Defrost Control Board Diagnostic LEDs 39. . . . . . . . . . .

Maintenance 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Homeowner Information 40. . . . . . . . . . . . . . . . . . . . . . . .

Field Operational Checklist 42. . . . . . . . . . . . . . . . . . . . .

Start−Up and Performance Checklist 43. . . . . . . . . . . . .

Litho U.S.A.

Page 2

506238−01 06/09

Unit Dimensions −− Inches (mm)

39−1/2

(1003)

1 (25)

LIQUID

LINE

INLET

SIDE VIEW ACCESS VIEW

DISCHARGE AIR

4−5/8

(117)

BASE

16−7/8

(429)

8−3/4

(222)

26−7/8

(683)

3−3/4 (95)

30−3/4

(781)

3−1/8

(79)

SUCTION

LINE

INLET

UNIT SUPPORT

FEET

35−1/2

(902)

18−1/2

(470)

8 (203)

4−1/2

(114)

ELECTRICAL INLET

(HIGH VOLTAGE)

37 (940)

SOLAR

MODULE

WIRING

ELECTRICAL INLET

(CONTROL WIRING

− LOW VOLTAGE)

Field Supplied Components

The followings items are field supplied (not included).

Parts Lennox Catalog Numbers

Solar Module (see Figure 17 for specifications) 48W00

Solar Module Mounting Kit − Roof applications 48W01

Solar Module Mounting Kit − Pole applications 48W02

DC rated disconnect (15A)

48W03

DC ground fault (if required)

DC surge arrestor

MC4 Cable 12 Gauge., 10 foot single wire (module leads to junction box) 48W04

Page 3

XPG20 SERIES

Unit Parts Arrangement

CONTACTOR

DEFROST

CONTROL

VAPOR VALVE AND GAUGE PORT

TWO−STAGE COMPRESSOR

OUTDOOR FAN

SOLAR ASSIST DC MOTOR

LENNOX SYSTEM OPERATION

MONITOR (LSOM)

RUN CAPACITOR

DISCHARGE LINE

REVERSING VALVE

SOLAR PANEL

TERMINAL BLOCK

BI−FLOW FILTER DRIER

FAN MOTOR

SOLAR ASSIST DC MOTOR

COUPLER

HIGH PRESSURE SWITCH

LOW PRESSURE

SWITCH

COMPRESSOR TERMINAL

PLUG

FAN MOTOR MOUNT

Control Panel Parts Arrangement

GROUND LUG

HIGH VOLTAGE FIELD

CONNECTIONS

CONTACTOR−1POLE,25A

(K1−1)

DEFROST CONTROL BOARD

(A108)

LOW VOLTAGE − CONTROL WIRE TIE

LSOM MODULE (A132) TERMINAL BLOCK − TWO POSITION

(SOLAR)

CAPACITOR

(C12)

DEFROST RELAY SOLAR FAN

(K227)

SOLAR FAN RELAY (24VAC) (K228)

Page 4

506238−01 06/09

WARNING

This product and/or the indoor unit it is matched

with may contain fiberglass wool.

Disturbing the insulation during installation,

maintenance, or repair will expose you to fiberglass

wool dust. Breathing this may cause lung cancer.

(Fiberglass wool is known to the State of California

to cause cancer.)

Fiberglass wool may also cause respiratory, skin,

and eye irritation.

To reduce exposure to this substance or for further

information, consult material safety data sheets

available from address shown below, or contact

your supervisor.

Lennox Industries Inc.

P.O. Box 799900

Dallas, TX 75379−9900

Shipping and Packing List

Check unit for shipping damage. Consult last carrier

immediately if damage is found.

1  Assembled outdoor unit.

1  Bag assembly that consist of the following:

1  Bushing (for low voltage wiring)

2  Isolation grommets for liquid and suction lines

System Overview

The SunSourcetComfort System heat pump, which will

also be referred to in this instruction as the outdoor unit,

uses HFC−410A refrigerant. This outdoor unit must be

installed with a matching indoor unit and line set as outlined

in the Lennox XPG20 Engineering Handbook.

This outdoor unit is designed for use in systems that use

check thermal expansion valve (CTXV) refrigerant

metering device.

Operating Gauge Set

This instruction is intended as a general guide and do not

supersede local codes in any way. Consult authorities who

have jurisdiction before installation.

TORQUE REQUIREMENTS

When servicing or repairing HVAC components, ensure

the fasteners are appropriately tightened. Table 1 list

torque values for fasteners.

IMPORTANT

To prevent stripping of the various caps used, the

appropriately sized wrench should be used and

fitted snugly over the cap before tightening.

IMPORTANT

Only use Allen wrenches of sufficient hardness

(50Rc − Rockwell Harness Scale minimum). Fully

insert the wrench into the valve stem recess.

Service valve stems are factory−torqued (from 9

ft−lbs for small valves, to 25 ft−lbs for large valves) to

prevent refrigerant loss during shipping and

handling. Using an Allen wrench rated at less than

50Rc risks rounding or breaking off the wrench, or

stripping the valve stem recess.

See the Lennox Service and Application Notes

#C−08−1 for further details and information.

Table 1. Torque Requirements

Parts Recommended Torque

Service valve cap 8 ft.− lb. 11 NM

Sheet metal screws 16 in.− lb. 2 NM

Machine screws #10 28 in.− lb. 3 NM

Compressor bolts 90 in.− lb. 10 NM

Gauge port seal cap 8 ft.− lb. 11 NM

Coupler Set Screws 150 in.− lb. 17 NM

Torque Arm Nut 55 in.− lb 6 NM

Assist Motor Bolts 35 in.− lb. 4 NM

Motor Mount Wire

Bracket

55 in.− lb 6 NM

11 12

1/6 TURN

1/12 TURN

11 12

Page 5

XPG20 SERIES

USING MANIFOLD GAUGE SET

When checking the system charge, use only a manifold

gauge set that features low−loss and anti−blow back

fittings.

(VALVE STEM

SHOWN CLOSED)

INSERT HEX

WRENCH HERE

VALVE STEM

FRONT-SEATED

TO OUTDOOR

UNIT

SERVICE PORT

CORE

TO INDOOR

UNIT

SERVICE PORT

CAP

CLOSED TO BOTH

INDOOR AND OUTDOOR

UNITS

STEM CAP

ANGLE−TYPE SERVICE VALVE

(FRONT−SEATED CLOSED)

SERVICE PORT

CORE

TO OUTDOOR

UNIT

STEM CAP

(VALVE STEM

SHOWN OPEN)

INSERT HEX

WRENCH HERE

SERVICE PORT

CAP

TO INDOOR

UNIT

OPEN TO BOTH

INDOOR AND

OUTDOOR

UNITS

ANGLE−TYPE SERVICE VALVE

(BACK−SEATED OPENED)

BALL (SHOWN

CLOSED)

SERVICE PORT

CORE

TO INDOOR UNIT

TO OUTDOOR UNIT

TO OPEN ROTATE STEM

COUNTERCLOCKWISE 90°.

TO CLOSE ROTATE STEM

CLOCKWISE 90°.

SERVICE PORT

SERVICE PORT CAP

STEM CAP

VALVE

STEM

OPEN TO LINE SET WHEN

VALVE IS CLOSED, TO BOTH

LINE SET AND UNIT WHEN

VALVE IS OPEN.

BALL−TYPE SERVICE

VALVE

Figure 1. Various Types of Service Valves

Manifold gauge set used with HFC−410A refrigerant

systems must be capable of handling the higher system

operating pressures. The gauges should be rated for use

with pressures of 0 − 800 psig on the high side, and a low

side of 30" vacuum to 250 psig with dampened speed to

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

psig of pressure with a 4000 psig burst rating.

OPERATING SERVICE VALVES

The liquid and vapor line service valves are used for

removing refrigerant, flushing, leak testing, evacuating,

checking charge and charging.

Each valve is equipped with a service port which has a

factory−installed valve stem as illustrated in Figure 1.

To Access Service Port:

A service port cap protects the service port core from

contamination and serves as the primary leak seal.

1. Remove service port cap with an appropriately sized

wrench.

2. Connect gauge to the service port.

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

tighten as follows:

DWith Torque Finger Wrench:

tighten and then tighten per

Table 1.

DWithout Torque Wrench:

Finger tighten and use an

appropriately sized wrench to

turn an additional 1/6 turn.

Operating Angle−Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

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

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

vapor-line valve sizes) to back the stem out

counterclockwise as far as it will go.

Operating Ball−Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use an appropriately sized wrenched to open.

STo open valve, roate stem counterclockwise 90°.

STo close rotate stem clockwise 90°.

Reinstall Stem Cap:

Replace the stem cap and tighten as follows:

SWith Torque Wrench: Finger

tighten and then tighten per Table 1.

SWithout Torque Wrench: Finger

tighten and use an appropriately

sized wrench to turn an

additional 1/12 turn clockwise.

NOTE Later in the procedure, the HFC−410A container

will be replace by the nitrogen container. A label with

specific torque requirements may be affixed to the stem

cap. If the label is present, use the specified torque.

Page 6

506238−01 06/09

Recovering Refrigerant from Existing

System

Connect gauge set as illustrated in Figure 2 for removing

refrigerant.

MANIFOLD GAUGES

RECOVERY

MACHINE

CLEAN

RECOVERY

CYLINDER

OUTDOOR

UNIT

HIGH

LOW

CONNECT TO THE EXISTING UNIT A GAUGE SET, CLEAN RECOVERY

CYLINDER AND A RECOVERY MACHINE. USE THE INSTRUCTIONS

PROVIDED WITH THE RECOVERY MACHINE ON HOW TO SETUP THE

CONNECTIONS.

Figure 2. Setup Gauge Set

REMOVING REFRIGERANT

Remove existing HCFC−22 refrigerant using one of the

following procedures:

METHOD 1:

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 to flush the system.

Remove all HCFC−22 refrigerant from the existing system.

Check gauges after shutdown to confirm that the entire

system is completely void of refrigerant.

METHOD 2:

Use this method if the existing outdoor unit is equipped

with manual shut−off valves, and plan on using new

HCFC−22 refrigerant to flush the system.

IMPORTANT

Some system configurations may contain higher

than normal refrigerant charge due to either large

internal coil volumes, and/or long line set. The

following conditions may cause the compressor to

stop functioning:

The following devices could prevent full system charge

recovery into the outdoor unit:

SOutdoor unit’s high or low−pressure switches (if

applicable) when tripped can cycled the compressor

OFF.

SCompressor can stop pumping due to tripped internal

pressure relief valve.

SCompressor has internal vacuum protection that is

designed to unload the scrolls (compressor stops

pumping) when the pressure ratio meets a certain

value or when the suction pressure is as high as 20

psig. (Compressor suction pressures should never be

allowed to go into a vacuum.

Once the compressor can not pump down to a lower

pressure due to one of the above system conditions, shut

off the suction valve. Turn OFF the main power to unit and

use a recovery machine to recover any refrigerant left in

the indoor coil and line set.

Perform the following task:

1. Start the existing HCFC−22 system in the cooling

mode and close the liquid line valve.

2. Pump as much of the existing HCFC−22 refrigerant

with the compressor back into the outdoor unit until

you have reached the limitations of the outdoor

system. Turn the outdoor unit main power OFF and

use a recovery machine to remove the remaining

refrigerant in the system.

NOTE  It may be necessary to bypass the low pressure

switches if equipped to ensure complete refrigerant

evacuation.

3. When the low side system pressures reach 0 psig,

close the suction line valve.

4. Check gauges after shutdown to confirm that the

valves are not allowing refrigerant to flow back into the

low side of the system.

Removing Existing Outdoor Unit

Perform the following task at the existing outdoor unit:

SDisconnect line set at the service valves.

SDisconnect electrical service at the disconnect switch

as illustrated in Figure 3.

SRemove old outdoor unit.

SERVICE

DISCONNECT

SWITCH

MAIN FUSE

BOX/BREAKER

PANEL

Disconnect all power to the existing outdoor unit at the disconnect

switch or main fuse box/breaker panel.

Figure 3. Disconnect Power

Page 7

XPG20 SERIES

Positioning New Outdoor Unit

CAUTION

In order to avoid injury, take proper precaution when

lifting heavy objects.

See Unit Dimensions on page 3 for sizing mounting slab,

platforms or supports. Refer to Figure 4 for mandatory

installation clearance requirements.

SEE NOTES BELOW THIS FIGURE FOR FURTHER DETAILS.

CONTROL PANEL

ACCESS LOCATION

Figure 4. Installation Clearances

NOTES:

SService clearance of 30 in. (762 mm) must be

maintained on one of the sides adjacent to the control

panel.

SClearance to one of the other three sides must be 36

in. (914 mm).

SClearance to one of the remaining two sides may be

12 in. (305 mm) and the final side may be 6 in. (152

mm).

S48 in. (1219 mm) clearance required on top of unit.

SA clearance of 24 in. (610 mm) must be maintained

between two units.

POSITIONING CONSIDERATIONS

Consider the following when positioning the unit:

SSome localities are adopting sound ordinances based

on the unit’s sound level registered from the adjacent

property, not from the installation property. Install the

unit as far as possible from the property line.

SWhen possible, do not install the unit directly outside

a window. Glass has a very high level of sound

transmission. For proper placement of unit in relation

to a window see the provided illustration in Figure 5.

SIn locating and positioning the unit, take into

consideration where the solar module will be located

and/or how the wire can or will be routed to it.

INSTALL UNIT AWAY FROM

WINDOWS

TWO 90° ELBOWS INSTALLED IN

LINE SET WILL REDUCE LINE SET

VIBRATION.

Figure 5. Outside Unit Placement

PLACING UNIT ON SLAB

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

should be high enough above grade so that water from

higher ground will not collect around the unit. The slab

should have a slope tolerance as described in Figure 6.

NOTE  If necessary for stability, anchor unit to slab as

described in Stabilizing Unit on Uneven Surfaces on page 9.

INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE

TOLERANCE OF 2 DEGREES (OR 2 INCHES PER 5 FEET [50 MM

PER 1.5 M]) AWAY FROM BUILDING STRUCTURE.

MOUNTING

SLAB

BUILDING

STRUCTURE

GROUND LEVEL

Figure 6. Slab Mounting at Ground Level

Page 8

506238−01 06/09

ELEVATING THE UNIT

These units are outfitted with elongated support feet as

illustrated in Figure 7.

LEG DETAIL

BASE

2" (50.8MM) SCH

40 FEMALE

THREADED

ADAPTER

Figure 7. Elevated Slab Mounting using Feet

Extenders

If additional elevation is necessary, raise the unit by

extending the height of the unit support feet. This may be

achieved by using a 2" SCH 40 female threaded adapter.

The specified coupling will fit snuggly into the recessed

portion of the feet. Use additional 2" SCH 40 male threaded

adaptors which can be threaded into the female threaded

adaptors to make additional adjustments to the level of the

unit.

NOTE  Keep the height of extenders short enough to

ensure a sturdy installation. If it is necessary to extend

further, consider a different type of field−fabricated

framework that is sturdy enough for greater heights.

Removing and Installing Panels

CAUTION

To prevent personal injury, or damage to panels,

unit or structure, be sure to observe the following:

While installing or servicing this unit, carefully stow

all removed panels out of the way, so that the panels

will not cause injury to personnel, nor cause

damage to objects or structures nearby, nor will the

panels be subjected to damage (e.g., being bent or

scratched).

While handling or stowing the panels, consider any

weather conditions, especially windy conditions,

that may cause panels to be blown around and

battered.

WARNING

Unit must be grounded in accordance

with national and local codes.

Electric Shock Hazard. Can cause

injury or death.

Line voltage is present at all

components when unit is not in

operation on units with single-pole

contactors. Disconnect all remote

electric power supplies before

opening access panel. Unit may have

multiple power supplies.

ACCESS PANEL

Removal and reinstallation of the access panel is

illustrated in Figure 8.

REMOVE 4 SCREWS TO REMOVE

PANEL FOR ACCESSING

COMPRESSOR AND CONTROL.

POSITION PANEL WITH HOLES

ALIGNED; INSTALL SCREWS AND

TIGHTEN.

Figure 8. Access Panel

LOUVERED PANELS

Remove the louvered panels as follows:

1. Remove two screws, allowing the panel to swing open

slightly.

2. Hold the panel firmly throughout this procedure.

Rotate bottom corner of panel away from hinged

corner post until lower three tabs clear the slots as

illustrated in Figure 9, Detail B.

3. Move panel down until lip of upper tab clears the top

slot in corner post as illustrated in Figure 9, Detail A.

Position and Install PanelPosition the panel almost

parallel with the unit as illustrated in Figure 9, Detail D with

the screw side as close to the unit as possible. Then, in a

continuous motion:

SSlightly rotate and guide the lip of top tab inward as

illustrated in Figure 9, Details A and C; then upward

into the top slot of the hinge corner post.

SRotate panel to vertical to fully engage all tabs.

SHolding the panel’s hinged side firmly in place, close

the right−hand side of the panel, aligning the screw

holes.

Page 9

XPG20 SERIES

Detail A

Detail C

Detail B

ROTATE IN THIS DIRECTION; THEN

DOWN TO REMOVE PANEL

SCREW

HOLES

Panel shown slightly rotated to allow top tab to exit (or enter)

top slot for removing (or installing) panel.

Maintain minimum panel angle (as close to parallel with the unit

as possible) while installing panel.

PREFERRED

ANGLE FOR

INSTALLATION

Detail D

ANGLE MAY BE

TOO EXTREME

HOLD DOOR FIRMLY ALONG THE HINGED SIDE

TO MAINTAIN FULLY−ENGAGED TABS

IMPORTANT! Do not allow panels to hang on unit by top tab. Tab is

for alignment and not designed to support weight of panel.

Figure 9. Removing/Installing Louvered Panels

When panel is correctly positioned and aligned, insert the

screws and tighten.

STABILIZING UNIT ON UNEVEN SURFACES

With unit positioned at installation site, remove two side

louvered panels to expose the unit base pan. Install the

brackets as illustrated in Figure 10 using conventional

practices. Replace the panels after installation is

complete.

To help stabilize an outdoor unit, some installations may

require strapping the unit to the pad using brackets and

anchors commonly available in the marketplace.

IMPORTANT

Unit Stabilizer Bracket Use (field−provided):

Always use stabilizers when unit is raised above the

factory height. (Elevated units could become

unstable in gusty wind conditions).

Stabilizers may be used on factory height units

when mounted on unstable an uneven surface.

ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY, TWO

BRACKETS PER SIDE, 2" FROM EACH CORNER.

CONCRETE SLAB − USE PLASTIC

PLASTIC ANCHOR (HOLE DRILL

1/4")PLASTIC SLAB − NO PLASTIC

ANCHOR (HOLE DRILL 1/8")

COIL

BASE PAN

CORNER

POST

STABILIZING

BRACKET (18

GAUGE METAL − 2"

WIDTH; HEIGHT AS

REQ’D)

Slab Side Mounting

#10 1/2" LONG

SELF−DRILLING

SHEET METAL

SCREWS

#10 1−1/4" LONG

HEX HD SCREW

AND FLATWASHER

MINIMUM 1

PER SIDE

STABILIZING BRACKET (18

GAUGE METAL − 2" WIDTH;

HEIGHT AS REQ’D); BEND

TO FORM RIGHT ANGLE

FOR EXTRA

STABILITY

Deck Top Mounting

Figure 10. Installing Stabilizer Brackets

New or Replacement Line Set

This section provides information on installation or

replacement of existing line set. If line set are not being

installed then proceed to Brazing Connections on page 11.

If refrigerant lines are routed through a wall, seal and

isolate the opening so vibration is not transmitted to the

building. Pay close attention to line set isolation during

installation of any HVAC system. When properly isolated

from building structures (walls, ceilings. floors), the

refrigerant lines will not create unnecessary vibration and

subsequent sounds. Also, consider the following when

placing and installing a high−efficiency air conditioner.

Page 10

506238−01 06/09

REFRIGERANT LINE SET

Field refrigerant piping consists of liquid and suction lines

from the outdoor unit (braze connections) to the indoor unit

coil (flare or sweat connections). Use Lennox L15 (sweat,

non−flare) series line set, or use field−fabricated refrigerant

lines as listed in Table 2.

Table 2. Refrigerant Line Set

Model

Field Connections Recommended Line Set

Liquid

Line

Suction

Line

Liquid

Line

Suction

Line L15 Line Set

−036 3/8".

(10 mm)

7/8"

(22 mm)

3/8"

(10 mm)

7/8"

(22 mm)

L15−65

15 ft. − 50 ft.

(4.6 m − 15 m)

NOTE  When installing refrigerant lines longer than 50

feet, see the Lennox Refrigerant Piping Design and

Fabrication Guidelines, or contact Lennox Technical

Support Product Applications for assistance. To obtain the

correct information from Lennox, be sure to communicate

the following points:

SModel (XPG20) and size of unit (e.g. −036).

SLine set diameters for the unit being installed as listed

in Table 2 and total length of installation.

SNumber of elbows and vertical rise or drop in the

piping.

MATCHING WITH NEW OR EXISTING INDOOR COIL

AND LINE SET

The RFC1  metering line consisted of a small bore

copper line that runs from condenser to evaporator coil.

Refrigerant is metered into the evaporator by utilizing

temperature/pressure evaporation effects on refrigerant in

the small RFC line. The length and bore of the RFC line

corresponded to the size of cooling unit.

Existing line set of proper size may be reused. If system

was previously HCFC−22 then lines must be flushed (see

Flushing the System on page ). If a Lennox RFC1 liquid line

is existing, it must be replaced.

If the XPG20 must be matched with a proper coil. The only

existing installed coils that could be re−used would be

current coils listed in the XPG20 matchup charts.

INSTALLING LINE SET

Line Set Isolation  This reference illustrates

procedures, which ensure proper refrigerant line set

isolation:

SInstallation of a transition from vertical to

horizontal is illustrated in Figure 11.

SInstallation of line set on vertical runs is illustrated in

Figure 12.

SInstallation of line set on horizontal runs is

illustrated in Figure 13.

NOTE − Similar installation

practices should be used if

line set is to be installed on

exterior of outside wall.

PVC

PIPE FIBERGLASS

INSULATION

CAULK

OUTSIDE

WALL

SUCTION LINE

WRAPPED WITH

ARMAFLEX

LIQUID LINE

IMPORTANT! Refrigerant lines

must not contact structure.

OUTSIDE WALL LIQUID LINE

SUCTION LINE

IMPORTANT - Refriger-

ant lines must not contact

wall.

WOOD BLOCK

BETWEEN STUDS

STRAP

SLEEVE

WOOD BLOCK

STRAP

SLEEVE

WIRE TIE

INSIDE WALL

Figure 11. Refrigerant Line Set: Transition from

Vertical to Horizontal

ANCHORED HEAVY NYLON

WIRE TIE OR AUTOMOTIVE

MUFFLER-TYPE HANGER

STRAP LIQUID

LINE TO SUCTION

LINE

WALL

STUD

LIQUID LINE

METAL SLEEVE

SUCTION LINE − WRAPPED

IN ARMAFLEX

AUTOMOTIVE

MUFFLER-TYPE HANGER

Figure 12. Refrigerant Line Set: Installing Vertical

Runs (New Construction Shown)

Other manuals for XPG20

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