Lennox T?CLASS TPA S4, T-CLASS TPA036S4N4, T-CLASS TPA042S4N4, T-CLASS TPA048S4N4, T-CLASS TPA060S4N4 Installation Instructions Manual

INSTALLATION

2011 Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.

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.

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HFCs, and HCFCs) as of July 1,

1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.

INSTRUCTIONS

T−CLASSt TPA*S4 Units

G and Y Voltages

HEAT PUMP UNITS

506648−01 06/11 Supersedes 11/10

TABLE OF CONTENTS

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

General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Model Number Identification 3. . . . . . . . . . . . . . . . . . . . . .

Operating Gauge Set and Service Valves 4. . . . . . . . . . .

Recovering Refrigerant from Existing System 6. . . . . . .

New Unit Placement 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

New or Replacement Line Set 8. . . . . . . . . . . . . . . . . . . . .

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

Flushing Line Set and Indoor Coil 14. . . . . . . . . . . . . . . .

Installing Indoor Metering Device 15. . . . . . . . . . . . . . . .

Leak Test Line Set and Indoor Coil 16. . . . . . . . . . . . . . .

Evacuating Line Set and Indoor Coil 17. . . . . . . . . . . . .

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

Servicing Unit Delivered Void of Charge 23. . . . . . . . . . .

Start−Up 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

System Refrigerant 23. . . . . . . . . . . . . . . . . . . . . . . . . . .

System Operation 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Defrost System 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Start−Up and Performance Checklist 31. . . . . . . . . . . . .

Litho U.S.A.

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.

NOTICE TO INSTALLER

UNIT PLACEMENT

It is critical for proper unit operation to place outdoor unit on an elevated surface as described in Unit Placement section on page 8.

BRAZING LINE SET TO SERVICE VALVES

It is imperative to follow the brazing technique illustrated starting on page 11 to avoid damaging the service valve’s internal seals.

06/11 506648−01

*2P0611* *P506648-01*

Shipping and Packing List

Check the unit components for shipping damage. If you find any damage, immediately contact the last carrier.

1  Assembled outdoor unit

1  Liquid line bi−flow filter drier

General

The T−Class TPA*S4 outdoor units use HFC−410A HFC refrigerant. This unit must be installed with a matching indoor blower coil and line set as outlined in the Lennox Engineering Handbook. TPA*S4 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 expansion valve approved for use with HFC−410A must be ordered separately and must be installed prior to operating the unit.

Page 1

Unit Dimensions − inches (mm)

Inlet Air

TOP VIEW

Inlet Air

Vapor Line Connection

Liquid Line Connection

4-3/8 (111)

Optional Unit Stand-

off Kit (4) (Field−

installed)

Compressor

Coil Drain Outlets

(Around Perimeter

Of Base)

6-3/8 (162)

4-3/8 (111)

TOP VIEW BASE SECTION

Outdoor Coil Fan

Compressor

Discharge Air

Electrical Inlets

Vapor and Liquid

Line Connections

Optional Unit Stand-off Kit (4) (Field−installed)

2-3/4 (70)

2 (51)

SIDE VIEW

3/4 (19)

SIDE VIEW

Model Number A B C

TPA036S4N4 24−1/4 (616) 33−1/4 (845) 32−1/2 (826) TPA042S4N4 28−1/4 (616) 33−1/4 (845) 32−1/2 (826) TPA048S4N4 28-1/4 (718) 37−1/4 (946) 36−1/2 (927) TPA060S4N4 28-1/4 (718) 43−1/4 (1099) 42−1/4 (1073)

Page 2

Typical Unit Parts Arrangement

SINGLE

RUN

CAPACITOR

(C12)

GROUND

LUG

CONTACTOR

(K−1)

CUTOUT FOR HIGH VOLTAGE CONDUIT

CONTROL

OUTDOOR FAN RELAY (K−10) − G VOLTAGE ONLY

DEFROST CONTROL (CMC1)

CHECK EXPANSION

LINE FILTER DRIER

CONTROL WIRE LOOP

NOTE  PLUMBING LAYOUT AND COMPRESSOR TYPE MAY VARY SLIGHTLY BETWEEN MODEL SIZES.

COMPRESSOR

HARNESS

DEFROST

THERMOSTAT

EQUALIZER LINE

BI−FLOW LIQUID

HIGH PRESSURE

CRANKCASE HEATER

THERMOSTAT (S40)

(S4)

VALV E

TRUE SUCTION

PORT

SWITCH (S4)

COMPRESS0R

DISCHARGE LINE

MUFFLER

LOW PRESSURE SWITCH (S87)

REVERSING VALVE (L1)

REVERSING VALVE SOLENOID

VAPOR LINE SERVICE VALVE

Model Number Identification

T = T−Class Product Line

Brand/Family

P = Heat Pump Outdoor Unit

Major Design Sequence

Nominal Cooling Capacity − Tons

Unit Type

A = 1st Generation

B = 2nd Generation

LIQUID LINE SERVICE

VALV E

Figure 1. Typical Unit Parts Arrangement

TPA Y1036 S 44 N

Minor Design Sequence

1 = 1st Revision 2 = 2nd Revision 3 = 3rd Revision

Coil type

4 = Four−sided

036 = 3 Tons

042 = 3.5 Tons

048 = 4 Tons 060 = 5 Tons

Cooling Efficiency

S = Standard Efficiency

Part Load Capability

N = No part load, single stage compressor

Refrigerant Type

4 = HFC−410A

Vol ta ge

Y = 208/230V-3 phase-60hz G = 460V-3 phase-60hz

Page 3

TPA*S4 SERIES

Operating Gauge Set and Service Valves

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities who have jurisdiction before installation.

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.

TORQUE REQUIREMENTS

When servicing or repairing heating, ventilating, and air conditioning components, ensure the fasteners are appropriately tightened. Table 1 lists torque values for fasteners.

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.

IMPORTANT

When servicing or repairing HVAC components, ensure the fasteners are appropriately tightened. Table 1 provides torque values for fasteners.

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

USING MANIFOLD GAUGE SET

When checking the system charge, only use a manifold gauge set that features low loss anti−blow back fittings.

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. Figure 2 provides information on how to access and operating both angle and ball service valves.

To prevent stripping of the various caps used, the appropriately sized wrench should be used and fitted snugly over the cap before tightening.

Page 4

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.

SERVICE PORT CAP

SERVICE PORT CORE

(VALVE STEM SHOWN

TO INDOOR

UNIT

(VALVE STEM SHOWN OPEN) INSERT HEX WRENCH HERE

CLOSED) INSERT HEX WRENCH HERE

SERVICE PORT

CORE

TO OUTDOOR UNIT

ANGLE−TYPE SERVICE VALVE

(BACK−SEATED OPENED)

When service valve is OPEN, the service port is open to linE set, indoor and outdoor unit.

Operating Ball Type Service Valve:

1. Remove stem cap with an appropriately sized wrench.

2. Use an appropriately sized wrenched to open. To open valve, rotate stem counterclockwise 90°. To close rotate stem clockwise 90°.

TO INDOOR UNIT

TO OPEN ROTATE STEM COUNTERCLOCKWISE 90°.

TO CLOSE ROTATE STEM CLOCKWISE 90°.

SERVICE PORT

CORE

CAP

TO OUTDOOR

UNIT

BALL (SHOWN CLOSED)

VALV E STEM

STEM CAP

ANGLE−TYPE SERVICE VALVE

(FRONT−SEATED CLOSED)

WHEN SERVICE VALVE IS CLOSED, THE SERVICE PORT IS OPEN TO

THE LINE SET AND INDOOR UNIT.

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 set to service port.

3. When testing is completed, replace service port cap and tighten as follows:

 With torque wrench: Finger tighten and

torque cap per table 1.

 Without torque wrench: Finger tighten and

use an appropriately sized wrench to turn an additional 1/6 turn clockwise.

Reinstall Stem Cap:

Stem cap protects the valve stem from damage and serves as the primary seal. Replace the stem cap and tighten as follows:

 With Torque Wrench: Finger tighten and

then torque cap per table 1.

 Without Torque Wrench: Finger tight-

en and use an appropriately sized wrench to turn an additional 1/12 turn clockwise.

1/6 TURN

1/12 TURN

NOTE  A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.

Figure 2. Angle and Ball Service Valves

Page 5

TPA*S4 SERIES

Recovering Refrigerant from Existing System

RECOVERING

REFRIGERANT FROM SYSTEM

DISCONNECT POWER

Disconnect all power to the existing outdoor unit at the service

disconnect switch or main fuse box/breaker panel.

SERVICE

DISCONNECT

SWITCH

RECOVERING REFRIGERANT

Remove existing refrigerant using one of the following procedures:

IMPORTANT  Some system configurations may contain higher than normal refrigerant charge due to either large internal coil volumes,

and/or long line sets.

CONNECT MANIFOLD GAUGE SET

Connect a gauge set, clean recovery cylinder and a recovery

machine to the service ports of the existing unit. Use the instructions provided with the recovery machine to make the connections.

MANIFOLD GAUGES

RECOVERY MACHINE

LOW

CLEAN RECOVERY CYLINDER

OUTDOOR UNIT

HIGH

METHOD 1:

Us this method 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 to flush the system.

Remove all 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 you plan to use new refrigerant to flush the system.

The following devices could prevent full system charge recovery into the outdoor unit:

 Outdoor unit’s high or low−pressure switches (if applicable) when tripped can cycle the compressor OFF.  Compressor can stop pumping due to tripped internal pressure relief valve.  Compressor 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. Prolonged operation at low suction pressures will result in overheating of the scrolls and permanent damage to the scroll tips, drive bearings and internal seals.)

Once the compressor can not pump down to a lower pressure due to one of the above system conditions, shut off the vapor 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:

A Start the existing system in the cooling mode and close the liquid line valve. B Use the compressor to pump as much of the existing HCFC−22 refrigerant into the outdoor unit until the outdoor system is full. Turn the outdoor unit

main power OFF and use a recovery machine to remove the remaining refrigerant from the system.

NOTE  It may be necessary to bypass the low pressure switches (if equipped) to ensure complete refrigerant evacuation.

C When the low side system pressures reach 0 psig, close the vapor line valve. D Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system.

Page 6

CLEARANCE ON ALL SIDES  INCHES (MILLIMETERS)

MINIMUM CLEARANCE

ABOVE UNIT

6 (152)

12 (305)

36 (914)

MINIMUM CLEARANCE BETWEEN

DETAIL A

Install unit away from windows .

DETAIL C

If unit coil cannot be mounted away from prevailing winter winds, a wind barrier should be constructed. Size barrier at least the same height and width as outdoor unit. Mount barrier 24 inches (610 mm) from the sides of the unit in the direction of prevailing winds as illustrated.

30 (762)

LINE SET CONNECTIONS

TWO UNITS

24 (610)

PREVAILING WINTER WINDS

INLET AIR

Figure 4. Placement, Slab Mounting and Wind Barrier

ACCESS PANEL

NOTES:

 Clearance to one of the other three

 Clearance to one of the remaining

Figure 3. Installation Clearances

Two 90° elbows installed in line set will reduce line set vibration.

WIND BARRIER

INLET AIR

sides must be 36 inches (914mm).

two sides may be 12 inches (305mm) and the final side may be 6 inches (152mm).

DETAIL B

These units operate under a wide range of weather conditions; therefore, several factors must be considered when positioning the outdoor unit. The unit must be positioned to give adequate clearances for sufficient airflow and servicing.

 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.

 Install the unit high enough above the ground or roof to allow

adequate drainage of defrost water and prevent ice or snow build−up.

 In heavy snow areas, do not locate the unit where drifting will

occur. The unit base should be elevated above the depth of average snows. Stand−off kits are available for ordering using either catalog numbers  94J45 (4 each) or 30K79 (20 each).

 When installed in areas where low ambient temperatures exist,

locate unit so winter prevailing winds do not blow directly onto outdoor unit.

 Locate unit away from overhanging roof lines which would allow

water or ice to drop on, or in front of, coil or unto unit.

INLET AIR

MOUNTING SLAB MUST SLOPE

AWAY FROM BUILDING.

STRUCTURE

48 (1219)

DISCHARGE AIR

GROUND LEVEL

Page 7

TPA*S4 SERIES

New Unit Placement

See Unit Dimensions on page 2 for sizing mounting slab, platforms or supports. Refer to figure 3 for mandatory installation clearance requirements.

POSITIONING CONSIDERATIONS

CAUTION

NOTICE

Roof Damage! This system contains both refrigerant and oil. Some

rubber roofing material may absorb oil and cause the rubber to swell when it comes into contact with oil. The rubber will then bubble and could cause leaks. Protect the roof surface to avoid exposure to refrigerant and oil during service and installation. Failure to follow this notice could result in damage to roof surface.

In order to avoid injury, take proper precaution when lifting heavy objects.

Consider the following when positioning the unit:

 Some 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.

 When 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 4.

PLACING OUTDOOR UNIT ON SLAB

When installing a unit at grade level, the top of the slab should be high enough above the grade so that water from higher ground would not collect around the unit as illustrated in figure 4.

Slab may be level or have a slope tolerance away from the building of not more than two degrees, or 2 inches per 5 feet (51 mm per 1524 mm) as illustrated in figure 4.

INSTALLING OUTDOOR UNIT ON ROOF

Install the unit at a minimum of 4 inches (102 mm) above the surface of the roof. Ensure the weight of the unit is properly distributed over roof joists and rafters. Redwood or steel supports are recommended. Refer to figure 4, detail c, for rooftop wind barrier considerations.

Table 2. Refrigerant Line Set  Inches (mm)

Model

TPA036S4N4

TPA042S4N4

TPA048S4N4

TPA060S4N4 3/8 in. (10 mm) 1−1/8 in. (29 mm) 3/8 in. (10 mm) 1−1/8 in. (29 mm) Field Fabricated

NOTE  Some applications may required a field provided 7/8" to 1−1/8" adapter

Liquid Line Vapor Line Liquid Line Vapor Line L15 Line Sets

3/8 in. (10 mm) 7/8 in. (22 mm) 3/8 in. (10 mm) 7/8 in. (22 mm) L15−65  15 ft. − 50 ft. (4.6 m − 15 m)

Field Connections Recommended Line Set

New or Replacement Line Set

This section provides information on new installation or replacement of existing line set. If a new or replacement line set is not required, 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:

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 braze connections). Use Lennox L15 (braze, non−flare) series line set, or use field−fabricated refrigerant lines as listed in table 2.

IMPORTANT

Mineral oils are not compatible with HFC−410A. If oil

must be added, it must be a Polyol ester oil.

The compressor is charged with sufficient Polyol ester oil for line set lengths up to 50 feet. Recommend adding oil to system based on the amount of refrigerant charge in the system. No need to add oil in system with 20 pounds of refrigerant or less. For systems over 20 pounds − add one ounce of every five pounds of refrigerant.

Page 8

Recommended topping−off POE oils are Mobil EAL ARCTIC 22 CC or ICI EMKARATE RL32CF.

NOTE  When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and Fabrication Guidelines, CORP. 9351−L9, or contact Lennox Technical Support Product Applications for assistance.

To obtain the correct information from Lennox, be sure to communicate the following points:

 Model (TPA*S4) and size of unit (e.g. −060).  Line set diameters for the unit being installed as listed

in table 2 and total length of installation.

 Number of elbows and if there is a rise or drop of the

piping.

MATCHING WITH NEW OR EXISTING INDOOR COIL AND LINE SET

The RFC1−metering line consisted of a small bore copper line that ran from condenser to evaporator coil. Refrigerant was 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.

If the TPA*S4 is being used with either a new or existing indoor coil which is equipped with a liquid line which served as a metering device (RFCI), the liquid line must be replaced prior to the installation of the TPA*S4 unit.

Typically a liquid line used to meter flow is 1/4" in diameter and copper.

IMPORTANT

Polyol ester (POE) oils used with HFC−410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections.

IMPORTANT

If this unit is being matched with an approved line set or indoor unit coil which was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC−410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. It can also clog the expansion device, and reduce the system performance and capacity. Failure to properly flush the system per the instructions below will void the warranty.

Page 9

TPA*S4 SERIES

LINE SET

INSTALLATION

Line Set Isolation  The following illustrations are

examples of proper refrigerant line set isolation:

REFRIGERANT LINE SET  TRANSITION

FROM VERTICAL TO HORIZONTAL

ANCHORED HEAVY NYLON

WIRE TIE OR AUTOMOTIVE

MUFFLER-TYPE HANGER

AUTOMOTIVE

MUFFLER-TYPE HANGER

IMPORTANT  Refrigerant lines must not contact structure.

REFRIGERANT LINE SET  INSTALLING

VERTICAL RUNS (NEW CONSTRUCTION SHOWN)

NOTE  Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the temperature of the liquid line or when pressure drop is equal to or greater than 20 psig.

IMPORTANT  Refrigerant lines must not contact wall

OUTSIDE WALL

VAPOR LINE

LIQUID LINE

WALL

STUD

STRAP LIQUID LINE TO VAPOR LINE

LIQUID LINE

NON−CORROSIVE

METAL SLEEVE

VAPOR LINE − WRAPPED IN ARMAFLEX

REFRIGERANT LINE SET  INSTALLING

HORIZONTAL RUNS

To hang line set from joist or rafter, use either metal strapping material or anchored heavy nylon wire ties.

WIRE TIE (AROUND VAPOR LINE ONLY)

8 FEET (2.43 METERS)

STRAPPING

MATERIAL (AROUND

VAPOR LINE ONLY)

TAPE OR WIRE TIE

FLOOR JOIST OR

ROOF RAFTER

8 FEET (2.43 METERS)

NON−CORROSIVE METAL SLEEVE

STRAP THE VAPOR LINE TO THE JOIST OR RAFTER AT 8 FEET (2.43 METERS) INTERVALS THEN STRAP THE LIQUID LINE TO THE VAPOR LINE.

TAPE OR WIRE TIE

WIRE TIE

INSIDE WALL

WOOD BLOCK

BETWEEN STUDS

SLEEVE

VAPOR LINE WRAPPED

WITH ARMAFLEX

OUTSIDE

WALL

PVC

PIPE

FIBERGLASS

INSULATION

CAULK

STRAP

NON−CORROSIVE METAL SLEEVE

WIRE TIE

WOOD BLOCK

WIRE TIE

STRAP

LIQUID LINE

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

FLOOR JOIST OR

ROOF RAFTER

WARNING  Polyol ester (POE) oils used with HFC−410A refrigerant absorb moisture very quickly. It is very important that the

refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections.

Figure 5. Line Set Installation

Page 10

Brazing Connections

Use the procedures outline in figures 6 and 7 for brazing line set connections to service valves.

WARNING

Danger of fire. Bleeding the refrigerant charge from only the high side may result in pressurization of the low side shell and suction tubing. Application of a brazing torch to a pressurized system may result in ignition of the refrigerant and oil mixture − Check the high and low pressures before applying heat.

IMPORTANT

Connect gauge set low pressure side to vapor line service valve and repeat procedure starting at paragraph 4 for brazing the liquid line to service port valve.

IMPORTANT

Allow braze joint to cool before removing the wet rag from the service valve. Temperatures above 250ºF can damage valve seals.

WARNING

When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).

CAUTION

Brazing alloys and flux contain materials which are hazardous to your health.

Avoid breathing vapors or fumes from brazing operations. Perform operations only in well−ventilated areas.

Wear gloves and protective goggles or face shield to protect against burns.

Wash hands with soap and water after handling brazing alloys and flux.

IMPORTANT

Use silver alloy brazing rods with 5% minimum silver alloy for copper−to−copper brazing. Use 45% minimum alloy for copper−to−brass and copper−to−steel brazing.

WARNING

Fire, Explosion and Personal Safety Hazard.

Failure to follow this warning could result in damage, personal injury or death.

Never use oxygen to pressurize or purge refrigeration lines. Oxygen, when exposed to a spark or open flame, can cause fire and/or an explosion, that could result in property damage, personal injury or death.

Page 11

TPA*S4 SERIES

CUT AND DEBUR

Cut ends of the refrigerant lines square (free from nicks or dents)

and debur the ends. The pipe must remain round. Do not crimp end of the line.

CUT AND DEBUR

LINE SET SIZE MATCHES

SERVICE VALVE CONNECTION

SERVICE VALVE

COPPER TUBE

REDUCER

CONNECTION

STUB

LINE SET SIZE IS SMALLER

THAN CONNECTION

REFRIGERANT LINE

DO NOT CRIMP SERVICE VALVE

CONNECTOR WHEN PIPE IS

SMALLER THAN CONNECTION

CAP AND CORE REMOVAL

Remove service cap and core from both the

vapor and liquid line service ports.

SERVICE PORT

CAP

SERVICE

PORT

CORE

LIQUID LINE SERVICE

VALV E

SUCTION / VAPOR LINE

SERVICE VALVE

ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE VALVES

Flow regulated nitrogen (at 1 to 2 psig) through the low−side refrigeration gauge set into the liquid line service port valve, and out of the suction / vapor line service port valve.

A Connect gauge set low pressure side to

liquid line service valve (service port).

B Connect gauge set center port to bottle of

nitrogen with regulator.

C Remove Schrader valve in suction / vapor

line service port to allow nitrogen to escape.

ATTACH

GAUGES

HIGHLOW

USE REGULATOR TO FLOW

NITROGEN AT 1 TO 2 PSIG.

SERVICE

PORT CORE

SERVICE PORT CAP

SUCTION / VAPOR SERVICE PORT MUST BE

OPEN TO ALLOW EXIT POINT FOR NITROGEN

VAPOR LINE

INDOOR

UNIT

LIQUID LINE

LIQUID LINE SERVICE

SUCTION /

VAPOR LINE

SERVICE

VALV E

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

Figure 6. Brazing Procedures

OUTDOOR

UNIT

NITROGEN

Page 12

WRAP SERVICE VALVES

To help protect service valve seals during brazing, wrap a saturated cloth around service valve bodies and copper tube stub. Use another

saturated cloth underneath the valve body to protect the base paint.

FLOW NITROGEN

Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and

out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections

BRAZE LINE SET

Wrap both service valves with a saturated cloth as illustrated here before brazing to line set.

LIQUID LINE SERVICE VALVE

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

IMPORTANT  Allow braze joint to cool. Apply

additional saturated cloths to help cool brazed joint. Do not remove wet rag until piping has cooled. Temperatures above 250ºF will damage valve seals.

LIQUID LINE

SATURATED CLOTH

WARNING

1. FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE will result if you do not wrap a wet cloth

around both liquid and suction line service valve bodies and copper tube stub while brazing in the line set! The braze, when complete, must be quenched with water to absorb any residual heat.

2. Do not open service valves until refrigerant lines and indoor coil have been leak−tested and evacuated. Refer to procedures provided in this supplement.

SUCTION / VAPOR LINE

PREPARATION FOR NEXT STEP

After all connections have been brazed, disconnect manifold gauge set from service ports. Apply saturated rags to both services valves to cool piping. Once piping is cool, remove all wet cloths. Refer to the unit installation instructions for the next step in preparing the unit.

SUCTION / VAPOR LINE

SERVICE VALVE

SATURATED CLOTH

WHEN BRAZING LINE SET TO

SERVICE VALVES, POINT FLAME

AWAY FROM SERVICE VALVE.

Figure 7. Brazing Procedures (continued)

Page 13

TPA*S4 SERIES

Flushing Line Set and Indoor Coil

Flushing is only required if existing indoor coil and line set are to be used. Otherwise proceed to Installing Indoor Metering Device on page 15.

TYPICAL EXISTING FIXED ORIFICE

DISTRIBUTOR

ASSEMBLY

A On fully cased coils, remove the coil access and plumbing panels. B Remove any shipping clamps holding the liquid line and distributor as-

sembly.

C Using two wrenches, disconnect liquid line from liquid line orifice hous-

ing. Take care not to twist or damage distributor tubes during this process.

D Remove and discard fixed orifice, valve stem assembly if present and

Teflon® washer as illustrated above.

E Use a field−provided fitting to temporary reconnect the liquid line to the

indoor unit’s liquid line orifice housing.

REMOVAL PROCEDURE (UNCASED COIL SHOWN)

DISTRIBUTOR TUBES

LIQUID LINE ORIFICE HOUSING

TEFLON® RING

FIXED ORIFICE

REMOVE AND DISCARD

WHITE TEFLON

(IF PRESENT)

SEAL

LIQUID LINE ASSEMBLY

(INCLUDES STRAINER)

BRASS NUT

TWO PIECE PATCH PLATE

(UNCASED COIL ONLY)

CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE

INVERTED CYLINDER CONTAINS CLEAN TO BE USED FOR FLUSHING.

VAPOR LINE

SERVICE VALVE

EXISTING

INDOOR

UNIT

LIQUID LINE SERVICE

VALV E

VAPOR

LIQUID

RECOVERY

CYLINDER

A Inverted cylinder with clean refrigerant to the vapor service valve. B gauge set (low side) to the liquid line valve. C gauge set center port to inlet on the recovery machine with an empty

recovery tank to the gauge set.

D Connect recovery tank to recovery machines per machine instructions.

OUTDOOR

NEW

UNIT

OPENED

RECOVERY MACHINE

GAUGE

MANIFOLD

LOW HIGH

CLOSED

TANK RETURN

INLET

DISCHARGE

TYPICAL EXISTING EXPANSION VALVE REMOVAL PROCEDURE (UNCASED COIL SHOWN)

LIQUID LINE

DISTRIBUTOR

TUBES

DISTRIBUTOR

ASSEMBLY

MALE EQUALIZER

LINE FITTING

SENSING BULB

A On fully cased coils, remove the coil access and plumbing panels. B Remove any shipping clamps holding the liquid line and distributor

assembly.

C Disconnect the equalizer line from the check expansion valve

equalizer line fitting on the vapor line.

D Remove the vapor line sensing bulb. E Disconnect the liquid line from the check expansion valve at the liquid

line assembly.

F Disconnect the check expansion valve from the liquid line orifice

housing. Take care not to twist or damage distributor tubes during this process.

G Remove and discard check expansion valve and the two Teflon® rings. H Use a field−provided fitting to temporary reconnect the liquid line to the

indoor unit’s liquid line orifice housing.

ORIFICE

HOUSING

EQUALIZER LINE

STUB END

TEFLON RING

VAPOR

CHECK

EXPANSION

VALV E

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

LINE

TEFLON

RING

SENSING

LINE

LIQUID

LINE

FLUSHING LINE SET

The line set and indoor unit coil must be flushed with at least the

same amount of clean refrigerant that previously charged the system. Check the charge in the flushing cylinder before proceeding.

A 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 existing system line set and indoor unit coil.

B Invert the cylinder of clean 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 unit coil before it enters the recovery machine.

C After all of the liquid refrigerant has been recovered, switch the

recovery machine to vapor recovery so that all of the vapor is recovered. Allow the recovery machine to pull down to 0 the system.

D Close the valve on the inverted drum and the gauge set valves.

Pump the remaining refrigerant out of the recovery machine and turn the machine off.

Figure 8. Removing Metering Device and Flushing

Page 14

Installing Indoor Metering Device

This outdoor unit is designed for use in systems that use expansion valve metering device (purchased separately) at the indoor coil.

See the Lennox TPA*S4 Engineering Handbook for approved expansion valve kit match ups. The expansion valve unit can be installed internal or external to the indoor coil. In applications where an uncased coil is being

installed in a field−provided plenum, install the expansion valve in a manner that will provide access for field servicing of the expansion valve. Refer to below illustration for reference during installation of expansion valve unit. .

After installation of the indoor coil metering device, proceed to Leak Test Line Set and Indoor Coil on page 16.

INDOOR EXPANSION VALVE INSTALLATION

TWO PIECE

PATCH PLATE

(UNCASED

COIL ONLY)

DISTRIBUTOR

TUBES

DISTRIBUTOR

ASSEMBLY

MALE EQUALIZER LINE

FITTING (SEE

EQUALIZER LINE INSTALLATION FOR FURTHER DETAILS)

(Uncased Coil Shown)

LIQUID LINE

ORIFICE

HOUSING

STUB

END

TEFLON RING

EQUALIZER LINE

VAPOR

EXPANSION

VALV E

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

LINE

TEFLON

RING

SENSING

LIQUID LINE

Sensing bulb insulation is required if mounted external to the coil casing. sensing bulb installation for bulb positioning.

EQUALIZER LINE INSTALLATION

A Remove and discard either the flare seal cap or flare nut

with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure to the right.

B Remove and discard either the flare seal cap or flare nut

with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure to the right.

LINE

A Remove the field−provided fitting that temporary

reconnected the liquid line to the indoor unit’s distributor assembly.

B Install one of the provided Teflon® rings around the

stubbed end of the expansion valve and lightly lubricate the connector threads and expose surface of the Teflon ring with refrigerant oil.

C Attach the stubbed end of the expansion valve to the

liquid line orifice housing. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above, or 20 ft−lb.

D Place the remaining Teflon® washer around the other

end of the expansion valve. Lightly lubricate connector threads and expose surface of the Teflon® ring with refrigerant oil.

E Attach the liquid line assembly to the expansion valve.

Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above or 20 ft−lb.

SENSING BULB INSTALLATION

A Attach the vapor line sensing bulb in the proper

orientation as illustrated to the right using the clamp and screws provided.

NOTE  Confirm proper thermal contact between vapor line and expansion bulb before insulating the sensing bulb once installed.

B Connect the equalizer line from the expansion valve to

the equalizer vapor port on the vapor line. Finger tighten the flare nut plus 1/8 turn (7 ft−lbs) as illustrated below.

VAPOR LINE

BULB

ON LINES SMALLER THAN 7/8", MOUNT SENSING BULB AT EITHER THE 3 OR 9 O’CLOCK POSITION.

BULB

1/2 Turn

1/8 Turn

FLARE SEAL CAP

FLARE NUT

COPPER FLARE SEAL BONNET

MALE BRASS EQUALIZER LINE FITTING

VAPOR LINE

BULB

NOTE  NEVER MOUNT ON BOTTOM OF LINE.

Figure 9. Installing Indoor Expansion Valve

Page 15

ON 7/8" AND LARGER LINES, MOUNT SENSING BULB AT EITHER THE 4 OR 8 O’CLOCK POSITION. NEVER MOUNT ON BOTTOM OF LINE.

BULB

TPA*S4 SERIES

IMPORTANT

Leak Test Line Set and Indoor Coil

The Environmental Protection Agency (EPA) prohibits the intentional venting of HFC refrigerants during maintenance, service, repair and disposal of appliance. Approved methods of recovery, recycling or reclaiming must be followed.

IMPORTANT

CONNECT GAUGE SET

A Connect an HFC−410A manifold gauge set high pressure

hose to the vapor valve service port.

NOTE  Normally, the high pressure hose is connected to the liquid line port. However, connecting it to the vapor port better protects the manifold gauge set from high pressure damage.

B With both manifold valves closed, connect the cylinder of

HFC−410A refrigerant to the center port of the manifold gauge set.

NOTE  Later in the procedure, the HFC−410A container will be replaced by the nitrogen container.

IMPORTANT

Leak detector must be capable of sensing HFC refrigerant.

After completing the leak testing the line set and indoor coil as outlined in figure 10, proceed to Evacuating Line Set and Indoor Coil on page 17.

WARNING

When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).

WARNING

Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.

Failure to follow this warning may result in personal injury or death.

HIGHLOW

MANIFOLD GAUGE SET

OUTDOOR UNIT

TEST FOR LEAKS

After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the

following procedure to test for leaks:

A With both manifold valves closed, connect the cylinder of HFC−410A refrigerant to the center port of the manifold gauge set. Open the valve

on the HFC−410A cylinder (vapor only).

B Open the high pressure side of the manifold to allow HFC−410A into the line set and indoor unit. Weigh in a trace amount of HFC−410A. [A

trace amount is a maximum of two ounces (57 g) refrigerant or three 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.

C Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.

D Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set

and the indoor unit.

E After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak

detector.

F After leak testing disconnect gauges from service ports.

NITROGEN

HFC−410A

Figure 10. Leak Test

Page 16

TO VAPOR

SERVICE VALVE

Evacuating Line Set and Indoor Coil

CONNECT GAUGE SET

NOTE  Remove cores from service valves (if not already done).

A Connect low side of manifold gauge set

with 1/4 SAE in−line tee to vapor line service valve

B Connect high side of manifold gauge

set to liquid line service valve

C Connect micron gauge available

connector on the 1/4 SAE in−line tee.

D Connect the vacuum pump (with

vacuum gauge) to the center port of the manifold gauge set. The center port line will be used later for both the HFC−410A and nitrogen containers.

NITROGEN

HFC−410A

VACUUM PUMP

OUTDOOR

UNIT

A34000 1/4 SAE TEE WITH SWIVEL COUPLER

500

MICRON

GAUGE

MANIFOLD

GAUGE SET

TO VAPOR

SERVICE VALVE

TO LIQUID LINE SERVICE VALVE

LOW

EVACUATE THE SYSTEM

A Open both manifold valves and start the vacuum pump.

B Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).

NOTE  During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. 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 pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.

C When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:

 Close manifold gauge valves  Close valve on vacuum pump  Turn off vacuum pump  Disconnect manifold gauge center port hose from vacuum pump  Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.  Open manifold gauge valves to break the vacuum in the line set and indoor unit.  Close manifold gauge valves.

D Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold gauge valves to release the

dry nitrogen from the line set and indoor unit.

E 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.

F When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an

upright cylinder of HFC−410A refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the line set and indoor unit.

G Perform the following:

 Close manifold gauge valves.  Shut off HFC−410A cylinder.  Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core

tool while maintaining a positive system pressure.

 Replace stem caps and secure finger tight, then tighten an additional one−sixth (1/6) of a turn as illustrated.

RECOMMEND

MINIMUM 3/8" HOSE

1/6 TURN

HIGH

Figure 11. Evacuating System

Page 17

TPA*S4 SERIES

WARNING

Danger of Equipment Damage. Avoid deep vacuum operation. Do not use compressors to evacuate a system. Extremely low vacuums can cause internal arcing and compressor failure. Damage caused by deep vacuum operation will void warranty.

CAUTION

Brazing alloys and flux contain materials which are hazardous to your health.

Avoid breathing vapors or fumes from brazing operations. Perform operations only in well ventilated areas.

Wear gloves and protective goggles or face shield to protect against burns.

Wash hands with soap and water after handling brazing alloys and flux.

Evacuating the system of non−condensables is critical for proper operation of the unit. Non−condensables are

defined as any gas that will not condense under temperatures and pressures present during operation of an air conditioning system. Non−condensables and water suction combine with refrigerant to produce substances that corrode copper piping and compressor parts.

IMPORTANT

Use a thermocouple or thermistor electronic vacuum gauge that is calibrated in microns. Use an instrument capable of accurately measuring down to 50 microns.

Electrical

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).

Refer to the furnace or air handler installation instructions for additional wiring application diagrams and refer to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size.

24VAC TRANSFORMER

Use the transformer provided with the furnace or air handler for low-voltage control power (24VAC − 40 VA minimum)

SIZE CIRCUIT AND INSTALL SERVICE DISCONNECT SWITCH

Refer to the unit nameplate for minimum circuit ampacity, and maximum fuse or circuit breaker (HACR per NEC). Install power wiring and properly sized disconnect switch.

SERVICE

DISCONNECT

SWITCH

NOTE  Units are approved for use only with copper conductors. Ground unit at disconnect switch or to an earth ground.

INSTALL THERMOSTAT

Install room thermostat (ordered separately) on an inside wall approximately in the center of the conditioned area and 5 feet (1.5m) from the floor. It should not be installed on an outside wall or where it can be affected by sunlight or drafts.

THERMOSTAT

5 FEET

(1.5M)

NOTE  24VAC, Class II circuit connections are made in the control panel.

Page 18

WARNING

Electric Shock Hazard. Can cause injury or death.

Line voltage is present at all components on units with single-pole contactors, even when unit is not in operation!

Unit may have multiple power supplies. Disconnect all remote electric power supplies before opening access panel.

Unit must be grounded in accordance with national and local codes.

Figures 14 and 15 show typical outdoor unit wiring diagrams for the TPA*S4 heat pumps.

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.

2. 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.

NOTE − Units are approved for use only with copper conductors. 24V, Class II circuit connections are made in the low voltage junction box (see figs. 14 and

15).

NOTE − A complete unit wiring diagram is located inside 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

more than 100’ (30m) 16

3. Install room thermostat (ordered separately) on an inside 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.

4. Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit (see figs. 12 and

13).

color−coded, temperature rating 35ºC minimum

Thermostat Indoor Unit

power

common

1st. stage aux. heat

indoor blower

reversing valve

compressor

(SOME CONNECTIONS MAY NOT APPLY. REFER TO SPECIFIC THERMOSTAT AND INDOOR UNIT.)

1st. stage aux. heat

power

common

Outdoor Unit

Figure 12. Low Voltage Wiring

Thermostat Indoor Unit Outdoor Unit

power

common

emergency heat

1st. stage aux. heat

indoor blower

reversing valve

compressor

(SOME CONNECTIONS MAY NOT APPLY. REFER TO

SPECIFIC THERMOSTAT AND INDOOR UNIT.)

emer.

heat

relay

power

common

outdoor t’stat

1st. stage aux. heat

Figure 13. Low Voltage Wiring (with aux. heat)

Three-Phase Scroll Voltage Phasing

Three-phase scroll compressors must be phased sequentially to ensure correct compressor rotation and operation. Incorrect line voltage phasing may cause compressor damage and abnormal unit operation. Power wires are color-coded as follows: Line 1 − red, line 2 − yellow, line 3 − blue. To test for proper rotation and operation:

1. Install refrigeration gauges on system. Cycle compressor On" and observe that suction pressure decreases and discharge pressure increases.

2. If pressures do not follow the above conditions, disconnect all power to unit. Reverse any two field−installed main power wires to the line side of the compressor contactor. Make sure connections are tight. Repeat pressure test with system.

Page 19

TPA*S4 SERIES

Figure 14. Typical Unit Wiring Diagram (Y Voltage)

Figure 15. Typical Unit Wiring Diagram (G Voltage)

Page 20

Figure 16. Typical Factory Wiring Diagram (Y Voltage)

Page 21

TPA*S4 SERIES

Figure 17. Typical Factory Wiring Diagram (G Voltage)

Page 22

Servicing Units Delivered Void of Charge

If the outdoor unit is void of refrigerant, clean the system using the procedure described below.

1. Leak check system using procedure outlined on page

16.

2. Evacuate the system using procedure outlined on page 17.

3. Use nitrogen to break the vacuum and install a new filter drier in the system.

4. Evacuate the system again using procedure outlined on page 17.

5. Weigh in refrigerant using procedure outlined in figure

20.

Start−Up

IMPORTANT

Crankcase heater (if applicable) should be energized 24 hours before unit start−up to prevent compressor damage as a result of slugging.

1. Check that fan rotates freely.

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

3. Open the liquid line and vapor line service valves (counterclockwise) to release refrigerant charge (contained in outdoor unit) into the system.

4. Replace the stem caps and tighten as specified in Operating Service Valves on page 4.

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 power to indoor blower unit and close the outdoor unit disconnect to start the unit.

7. Recheck voltage while the unit is running. Power must be within range shown on the nameplate.

8. Check system for sufficient refrigerate by using the procedures listed under System Refrigerant.

System Charge

This section outlines procedures for:

1. Connecting gauge set for testing and charging;

2. Checking and adjusting indoor airflow;

3. Adding or removing refrigerant.

GAUGE SET

CONNECTIONS FOR TESTING AND CHARGING

TRUE SUCTION PORT

CONNECTION

CHARGE IN

LIQUID PHASE

TEMPERATURE

SENSOR

AClose manifold gauge set valves and connect the center hose to a cylinder of HFC−410A. Set for

liquid phase charging.

INSIDE OUTDOOR UNIT

BConnect the manifold gauge set’s low pressure side to the true suction port.

CConnect the manifold gauge set’s high pressure side to the liquid line service port.

DPosition temperature sensor on liquid line near liquid line service port.

REFRIGERANT TANK

DIGITAL SCALE

TO LIQUID

LINE SERVICE

MANIFOLD GAUGE SET

LOW

HIGH

VALV E

TEMPERATURE SENSOR

(LIQUID LINE)

OUTDOOR UNIT

LIQUID LINE SERVICE PORT

Figure 18. Gauge Set Connections

Page 23

TPA*S4 SERIES

ADDING OR REMOVING REFRIGERANT

Check airflow using the Delta−T (DT) process using the illustration in figure 19.

Temp. of air entering indoor coil ºF

Wet−bulb ºF

53º

DRY

BULB

80 24 24 24 23 23 22 22 22 20 19 18 17 16 15 78 23 23 23 22 22 21 21 20 19 18 17 16 15 14 76 22 22 22 21 21 20 19 19 18 17 16 15 14 13 74 21 21 21 20 19 19 18 17 16 16 15 14 13 12

Dry−bulb

72 20 20 19 18 17 17 16 15 15 14 13 12 11 10

70 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

Drop

19º

All temperatures are expressed in ºF

air flowair flow

INDOOR COIL

1. Determine the desired DTMeasure entering air temper- ature using dry bulb (A) and wet bulb (B). DT is the intersecting value of A and B in the table (see triangle).

2. Find temperature drop across coilMeasure the coil’s dry

bulb entering and leaving air temperatures (A and C). Temperature Drop Formula: (T

3. Determine if fan needs adjustmentIf the difference between

72º

64º

WET

BULB

DRY

BULB

the measured T +

3º, no adjustment is needed. See examples: Assume DT =

15 and A temp. = 72º, these C temperatures would necessitate stated actions:

Cº T

53º 19 – 15 = 4 Increase the airflow 58º 14 – 15 = −1 (within +3º range) no change 62º 10 – 15 = −5 Decrease the airflow

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

– DT = ºF ACTION

Drop

and the desired DT (T

Drop

) = A minus C.

Drop

–DT) is within

Drop

crease/decrease fan speed.

Changing air flow affects all temperatures; recheck temperatures to confirm that the temperature drop and DT are within

3º.

Figure 19. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart

Use WEIGH IN method for adding initial refrigerant charge, and then use SUBCOOLING method for

verifying refrigerant charge.

WEIGH IN

OUTDOOR UNIT VOID OF CHARGE

CHARGING METHOD

If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the

CALCULATING SYSTEM CHARGE FOR

unit. To calculate the total refrigerant charge:

Amount specified on

nameplate

NOTE  The above nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.

Adjust amount. for variation

in line set length listed on

line set length table below.

Additional charge specified

per indoor unit match−ups

starting on page 25.

Refrigerant Charge per Line Set Length

Liquid Line

Set Diameter

3/8" (9.5 mm)

*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.

Ounces per 5 feet (g per 1.5 m)

adjust from 15 feet (4.6 m) line set*

3 ounce per 5’ (85 g per 1.5 m)

Total charge

Figure 20. Weigh In Method

Page 24

SUBCOOLING

USE COOLING

MODE

60ºF (15º)

USE HEATING

MODE

1 Check the airflow as illustrated in figure 19 to be sure the indoor airflow is as

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

2 Measure outdoor ambient temperature; determine whether to use cooling mode

or heating mode to check charge.

3 Connect gauge set. 4 Check Liquid and Vapor line pressures. Compare pressures with Normal

Operating Pressures table 7, (The reference table is a general guide. Expect

minor pressure variations. Significant differences may mean improper charge or other system problem.)

5 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 68ºF (20ºC). When pressures have stabilized, continue with step 6.

SATº LIQº – SCº =

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 77ºF (25ºC). When pressures have stabilized, continue with step 6.

6 Read the liquid line temperature; record in the LIQº space. 7 Read the liquid line pressure; then find its corresponding temperature in the

temperature/ pressure chart listed in table 8 and record it in the SATº space. 8 Subtract LIQº temp. from SATº temp. to determine subcooling; record it in SCº space. 9 Compare SCº 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 3 through 6 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 21. Using Subcooling Method

Table 3. TPA*S4−036

Target

INDOOR MATCHUPS

CBX26UH−036 17 10 2 7

CBX27UH−036−230 10 5 2 7

CBX27UH−042−230 10 10 2 13

CBX32M−036, −042 10 5 2 7

CBX32MV−036−230 10 5 2 7

CBX40UHV−036 10 5 2 7

CH33−31A, −31B 10 5 2 8

CH33−36B 10 5 0 0

CH33−36C 10 5 0 5

CH33−42 10 5 2 8

CH33−44/48B 10 5 2 10

CH33−48C 10 5 2 10

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

Subcooling

Heat Cool

5ºF)(+1ºF)

*Add

charge

lb oz

Table 4. TPA*S4−042

Target

INDOOR MATCHUPS

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 0 0

CBX32MV−036 15 5 0 0

CBX32MV−048−230 10 6 4 5

CBX40UHV−036 15 5 0 0

CBX40UHV−042, −048 10 6 4 5

CH33−43C, −48C 10 6 1 1

CH33−49C, −50/60C 10 6 4 5

CH33−60D 10 6 2 6

CR33−48 32 5 0 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

Subcooling

Heat Cool

5ºF)(+1ºF)

*Add

charge

lb oz

Page 25

TPA*S4 SERIES

Table 5. TPA*S4−048

Target

INDOOR MATCHUPS

CBX26UH−048 9 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

CBX40UHV−048 11 11 1 3

CBX40UHV−060 11 11 1 3

CH33−43C 18 7 0 0

CH33−49C, −50/60C 11 11 1 3

CH33−60D 11 11 0 9

CH33−62D 11 11 1 10

CR33−50/60 25 7 0 9

CR33−60 25 7 0 9

CX34−49 11 11 1 1

CX34−60D 11 11 0 9

Subcooling

Heat Cool

5ºF)(+1ºF)

*Add

charge

lb oz

Table 7. Normal Operating Pressures − Liquid +10 and Vapor +5 PSIG*

IMPORTANT

Table 6. TPA*S4−060

Target

INDOOR MATCHUPS

CBX26UH−060 10 11 1 7

CBX27UH−060−230 10 9 0 13

CBX32MV−060 10 9 0 0

CBX32MV−068 10 9 0 9

CBX40UHV−060 10 9 0 0

CH33−60D 10 9 0 0

CH33−62D 10 9 0 11

CX34−62D 10 9 0 6

*Amount of charge required in additional to charge shown on unit

nameplate. (Remember to consider line set length difference.)

Subcooling

Heat Cool

5ºF)(+1ºF)

*Add

charge

lb oz

Use table 7 as a general guide when performing maintenance checks. This is not a procedure for charging the unit (Refer to Charging / Checking Charge section). Minor variations in these pressures may be expected due to differences in installations. Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system.

TPA*S4−036 TPA*S4−042 TPA*S4−048 TPA*S4−060

Mode

5F (5C)**

65 (18) 260 / 136 231 / 135 246 / 134 256 / 116 75 (24) 303 / 140 267 / 138 286 / 136 298 / 123

Cooling

85 (29) 348 / 143 314 / 140 330 / 138 345 / 131 95 (35) 398 / 145 367 / 143 379 / 140 395 / 135 105 (41) 452 / 148 414 / 146 432 / 143 450 / 138 115 (45) 512 / 151 473 / 148 492 / 146 512 / 141 60 (15) 350 / 131 366 / 129 348 / 119 379 / 127 50(10) 331 / 111 348 / 110 334 / 105 361 / 109

Heating

40 (4) 314 / 91 333 / 91 312 / 84 341 / 89 30 (−1) 303 / 74 317 / 70 300 / 73 323 / 71 20 (−7) 290 / 62 298 / 58 286 / 60 310 / 60

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

**Temperature of the air entering the outside coil.

Liquid / Vapor Liquid / Vapor Liquid / Vapor Liquid / Vapor

Page 26

Table 8. 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

−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

−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

−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 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 11 8 75 217.4 11 0 365 6 56.4 41 120.3 76 220.9 111 370 7 57.9 42 122.6 77 224.4 11 2 375.1 8 59.3 43 125 78 228 11 3 380.2 9 60.8 44 127.3 79 231.6 11 4 385.4

10 62.3 45 129.7 80 235.3 11 5 390.7 11 63.9 46 132.2 81 239 116 396 12 65.4 47 134.6 82 242.7 11 7 401.3 13 67 48 137.1 83 246.5 11 8 406.7 14 68.6 49 139.6 84 250.3 11 9 412.2 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

32 100.8

36 109.2 71 203.9 106 345.3

63 178.5

67 190.9 102 326.4

94 290.8

98 308.2

125 445.9

Filter Drier

The unit is equipped with a large−capacity bi−flow 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 (S87)

The TPA*S4 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 40 psig and opens at 25 psig. It is not adjustable.

High Pressure Switch (S4)

The TPA*S4 is equipped with a manual-reset high pressure switch (single−pole, single−throw) which is located on the liquid line. The switch shuts off the compressor when discharge 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.

MANUAL RESET

BUTTON

System Operation

IMPORTANT

Some scroll compressor have internal vacuum protector that will unload scrolls when suction pressure goes below 20 psig. A hissing sound will be heard when the compressor is running unloaded. Protector will reset when low pressure in system is raised above 40 psig. DO NOT REPLACE COMPRESSOR.

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.

Figure 22. High Pressure Switch (S4) Manual Reset

Crankcase Heater (HR1) and Thermostat Switch (S40)

Compressor in models listed below are equipped with a 40 watt belly band type crankcase heater. HR1 prevents liquid from accumulating in the compressor. HR1 is controlled by a single pole, single throw thermostat switch (S40) located on the liquid line (see figure 1 for location).

When liquid line temperature drops below 50°F the thermostat closes energizing HR1. The thermostat will open, de−energizing HR1 once liquid line temperature reaches 70° F.

Page 27

TPA*S4 SERIES

Defrost System

The TPA*S4 defrost system includes two components: a defrost thermostat (S6) and a defrost control (CMC1).

FIELD SELECT

TIMING PINS

TEST

PINS

DIAGNOSTIC

COMPRESSOR

DELAY PINS

REVERSING

VALV E

S87

LOW PRESSURE

SWITCH

DEFROST

THERMOSTAT

HIGH PRESSURE

SWITCH

Figure 23. Defrost Control (CMC1)

Defrost Thermostat (S6)

The defrost thermostat is located on the liquid line between the check/expansion valve and the distributor. When defrost thermostat senses 42°F (5.5°C) or cooler, the thermostat contacts close and send a signal to the defrost control to start the defrost timing. It also terminates defrost when the liquid line warms up to 70°F (21°C).

Defrost Control (CMC1)

The defrost control includes the combined functions of a time/temperature defrost control, defrost relay, diagnostic LEDs and terminal strip for field wiring connections. See figure 23.

The defrost control provides automatic switching from normal heating operation to defrost mode and back. When the defrost thermostat is closed, the control accumulates compressor run time at 30, 60 or 90 minute field adjustable intervals. When the selected compressor run time interval is reached, the defrost relay is energized and defrost begins.

Defrost Control Timing Pins (P1)

Each timing pin selection provides a different accumulated compressor run time period for one defrost cycle. This time period must occur before a defrost cycle is initiated. The defrost interval can be adjusted to 30 (T1), 60 (T2), or 90 (T3) minutes (see figure 23). The maximum defrost period is 14 minutes and cannot be adjusted.

NOTE  Defrost control part number is listed near the P1 timing pins.

 Units with defrost control 100269−02: Factory default

is 60 minutes

LEDS

24V TERMINAL STRIP CONNECTIONS

 Units with defrost control 100269−04: Factory default

is 90 minutes

If the timing selector jumper is missing, the defrost control defaults to a 90−minute defrost interval.

Compressor Delay (P5)

The defrost control has a field−selectable function to reduce occasional sounds that may occur while the unit is cycling in and out of the defrost mode.

 Units with defrost control 100269−02: The compressor

will be cycled off for 30 seconds going in and out of the defrost mode when the compressor delay jumper is removed.

 Units with defrost control 100269−04: The compressor

will be cycled off for 30 seconds going in and out of the defrost mode when the compressor delay jumper is installed.

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 power 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.

Test Mode (P1)

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 jumpered. If the jumper is in the TEST position at

power-up, the defrost control will ignore the test pins. When the jumper is placed across the TEST pins for two seconds, the defrost control will enter 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 thermostat 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−applied.

Defrost Control Diagnostic LEDs

The defrost board uses two LEDs for diagnostics. The LEDs flash a specific sequence according to the condition.

Table 9. Defrost Control (CMC1) Diagnostic LEDs

Mode Green LED (DS2) Red LED (DS1)

No power to control

Normal operation / power to control

Anti-short cycle lockout

High pressure switch fault

High pressure switch lockout

OFF OFF

Simultaneous Slow FLASH

Alternating Slow FLASH

Slow FLASH OFF

ON OFF

Page 28

Maintenance

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.

Motor Nameplate:_________ Actual:__________.

7. Inspect drain holes in coil compartment base and clean if necessary.

OWNER

Cleaning of the outdoor unit’s coil should be performed by a trained service technician. Contact your dealer and set up a schedule (preferably twice a year, but at least once a year) to inspect and service your outdoor unit. The following maintenance may be performed by the homeowner.

IMPORTANT

Sprinklers and soaker hoses should not be installed where they could cause prolonged exposure to the outdoor unit by treated water. Prolonged exposure of the unit to treated water (i.e., sprinkler systems, soakers, waste water, etc.) will corrode the surface of steel and aluminum parts and diminish performance and longevity of the unit.

NOTE - If insufficient heating or cooling occurs, the unit should be gauged and refrigerant charge should be checked.

Outdoor Coil

It may be necessary to flush the outdoor coil more frequently if it is exposed to substances which are corrosive or which block airflow across the coil (e.g., pet urine, cottonwood seeds, fertilizers, fluids that may contain high levels of corrosive chemicals such as salts)

 Outdoor Coil  The outdoor coil may be flushed with

a water hose.

 Outdoor Coil (Sea Coast)  Moist air in ocean

locations can carry salt, which is corrosive to most metal. Units that are located near the ocean require frequent inspections and maintenance. These inspections will determine the necessary need to wash the unit including the outdoor coil. Consult your installing contractor for proper intervals/procedures for your geographic area or service contract.

Indoor Unit

1. Clean or change filters.

2. Lennox blower motors are prelubricated and permanently sealed. No more lubrication is needed.

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:__________.

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.

Outdoor Coil

The outdoor unit must be properly maintained to ensure its proper operation.

 Please contact your dealer to schedule proper

inspection and maintenance for your equipment.

 Make sure no obstructions restrict airflow to the

outdoor unit.

 Grass clippings, leaves, or shrubs crowding the unit

can cause the 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.

Routine Maintenance

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. Air Filter  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. Disposable Filter  Disposable filters should be

replaced with a filter of the same type and size.

NOTE  If you are unsure about the filter required for your system, call your Lennox dealer for assistance.

3. Reusable Filter  Many indoor units are equipped

with reusable foam filters. Clean foam filters with a mild soap and water solution; rinse thoroughly; allow filter to dry completely before returning it to the unit or grille.

NOTE  The filter and all access panels must be in place any time the unit is in operation.

4. Indoor Unit  The indoor unit’s evaporator coil is

equipped with a drain pan to collect condensate formed as your system removes humidity from the inside 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.)

Page 29

TPA*S4 SERIES

Thermostat Operation

See the thermostat homeowner manual for instructions on how to operate your thermostat.

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 considerably 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 defrost 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 defrost cycle to satisfy a heating demand; however, the unit will return to normal operation at the conclusion of the defrost cycle.

Extended Power Outage

The heat pump is equipped with a compressor crankcase heater which protects the compressor from refrigerant slugging during cold weather operation.

If power to your unit has been interrupted for several hours or more, set the room thermostat selector to the EMERGENCY 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 normal heat pump operation may resume.

Preservice Check

If your system fails to operate, check the following before calling for service:

 Verify room thermostat settings are correct.  Verify that all electrical disconnect switches are ON.  Check for any blown fuses or tripped circuit breakers.  Verify unit access panels are in place.  Verify air filter is clean.  If service is needed, locate and write down the unit

model number and have it handy before calling.

Accessories

For update−to−date information, see any of the following publications:

 Lennox TPA*S4 Engineering Handbook

 Lennox Product Catalog

 Lennox Price Book

Cleaning Outdoor Coil

1. Make sure power is off before cleaning. Clean and inspect outdoor coil. The coil may be flushed with a water hose.

2. The outdoor coil is protected by an inner mesh screen and a wire cage (see figure 24). If debris has collected between the mesh screen and the coil and cannot be dislodged by spraying unpressurized water from inside coil surface to the outside, the mesh may be removed by first removing the top of the unit which will allow for removal of the wire cage.

3. Then, using pliers to grip the head of the push pins, pull straight out to extract the push pins along one side of the coil. If necessary, remove the push pins along the back of the unit; it is usually unnecessary to fully remove the inner mesh screen.

4. Drape the mesh screen back and wash the coil. When all the debris has been removed from the coil, reinstall the mesh screen by positioning it in its original position and reinserting the push pin. No tool is required to push the pin back into the same slot in the fins.

5. If the push pin is loose and tends not to stay in place, brush the fins with a fin brush (22 fins/in). Line up the push pin a couple fins to the right or left of the original hole and re−insert the pin.

9 PINS USED ON −048 AND −060; 6 PINS ALL OTHERS

PUSH PIN

MESH SCREEN

Figure 24. Cleaning Debris from Mesh

Page 30

TPA*S4 Checklist

Job Name Job no. Date

Job Location City State

Installer City State

Unit Model No. Serial No. Service Technician

Nameplate Voltage

Rated Load Ampacity Compressor Outdoor Fan

Maximum Fuse or Circuit Breaker

Electrical Connections Tight?  Indoor Filter clean?  Supply Voltage (Unit Off)

Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.

Discharge Pressure Vapor Pressure Refrigerant Charge Checked? 

Refrigerant Lines: Leak Checked?  Properly Insulated?  Outdoor Fan Checked? 

Service Valves: Fully Opened?  Caps Tight?  Thermostat

Voltage With Compressor Operating Calibrated?  Properly Set?  Level? 

Page 31

TPA*S4 SERIES

Lennox T?CLASS TPA S4, T-CLASS TPA036S4N4, T-CLASS TPA042S4N4, T-CLASS TPA048S4N4, T-CLASS TPA060S4N4 Installation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual