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Service Literature
T−CLASStTPA*S4 COMMERCIAL SERIES UNITS
The TPA*S4 is a HFC−410A commercial split-system
heat pump. The series is designed for use with expansion
valves (TXV). All TPA*S4 units utilize scroll compressors.
TPA*S4 series units are available in 3, 3.5, 4 and 5 ton
capacities. All major components (indoor blower and coil)
must be matched according to Lennox recommendations
for the compressor to be covered under warranty. Refer to
the
Engineering
Handbook
matchups.
This manual is divided into sections which discuss the
major
components,
refrigerant
procedure, maintenance and operation sequence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are subject
to change.
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
This unit must be matched with an indoor coil as
specified in Lennox' Engineering Handbook. Coils
previously charged with HCFC−22 must be flushed.
MODEL NUMBER IDENTIFICATION
T = T−Classt Product Line
P = Heat Pump Outdoor Unit
Corp. 0632−L6
Revised 05−2009
for
approved
system
system,
charging
T P A
036 S
Brand/Family
Unit Type
Major Design Sequence
A = 1st Generation
B = 2nd Generation
Nominal Cooling Capacity − Tons
036 = 3 Tons
042 = 3.5 Tons
048 = 4 Tons
060 = 5 Tons
Cooling Efficiency
S = Standard Efficiency
Table of Contents
Specifications / Electrical Data
Optional Accessories
I Unit Components
. . . . . . . . . . . . . . . . . . .
II Refrigerant System
III Charging
. . . . . . . . . . . . . . . . . . . . . . . . .
IV Maintenance
. . . . . . . . . . . . . . . . . . . . . .
V Diagrams
. . . . . . . . . . . . . . . . . . . . . . . . .
4 n
4
1
Y
Voltage
Y = 208/230V-3 phase-60hz
G = 460V-3 phase-60hz
Minor Design Sequence
1 = 1st Revision
2 = 2nd Revision
3 = 3rd Revision
Coil type
4 = Four−sided
Part Load Capability
N = No part load, single stage compressor
Refrigerant Type
4 = R−410A
Page 1
TPA*S4
3, 3.5, 4 and 5 ton
10.5, 12.3, 14 and 17.6 kW
. . . . . . . . .
Page 2
. . . . . . . . . . . . . . . . .
Page 3
Page 4
. . . . . . . . . . . . . . . . .
Page 8
Page 10
Page 16
Page 17
© 2006 Lennox Industries Inc.
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Related Manuals for Lennox T?CLASS TPA S4 SERIES
Summary of Contents for Lennox T?CLASS TPA S4 SERIES
- Page 1 (TXV). All TPA*S4 units utilize scroll compressors. TPA*S4 series units are available in 3, 3.5, 4 and 5 ton capacities. All major components (indoor blower and coil) must be matched according to Lennox recommendations for the compressor to be covered under warranty. Refer to Engineering...
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Page 2: Specifications
SPECIFICATIONS Model No. TPA036S4 TPA042S4 TPA048S4 TPA060S4 General Data Nominal Tonnage Connections Liquid line o.d. − in. (sweat) Vapor line o.d. − in. 1-1/8 Refrigerant HFC−410A charge furnished 8 lbs. 12 oz. 10 lbs. 10 oz. 13 lbs. 2 oz. 15 lbs. -
Page 3: Optional Accessories
OPTIONAL ACCESSORIES − must be ordered extra Model No. TPA036S4 TPA042S4 TPA048S4 TPA060S4 Compressor Low Ambient Cut−Off 45F08 Compressor Sound Cover 69J03 Freezestat 3/8 in. tubing 93G35 5/8 in. tubing 50A93 Hail Guards 92M89 92M90 12W21 92M94 Low Ambient Kit 54M89 Low Ambient Control Option (down to 30°F) See table below... -
Page 4: I − Unit Components
I − UNIT COMPONENTS DANGER Unit components are illustrated in figure 1. Electric Shock Hazard. TPA*S4 UNIT COMPONENTS May cause injury or death. Disconnect all remote electrical power control box condenser fan supplies before opening unit panel. Unit may have multiple power supplies. A −... - Page 5 Defrost Control power-up, the control will ignore the test pins. When the jumper is placed across the TEST pins for two seconds, the The defrost control board includes the combined functions control will enter the defrost mode. If the jumper is removed of a time/temperature defrost control, defrost relay, diagnostic LEDs and terminal strip for field wiring before an additional 5−second period has elapsed (7...
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Page 6: Scroll Compressor
The liquid is worked toward the center of the scroll and is discharged. If the compressor is SCROLL COMPRESSOR replaced, conventional Lennox cleanup practices must be DISCHARGE used. Due to its efficiency, the scroll compressor is capable of drawing a much deeper vacuum than reciprocating compressors. - Page 7 SUCTION SUCTION INTERMEDIATE PRESSURE ORBITING SCROLL CRESCENT SHAPED GAS POCKET STATIONARY SCROLL SUCTION POCKET FLANKS SEALED BY CENTRIFUGAL SUCTION SUCTION FORCE MOVEMENT OF ORBIT DISCHARGE HIGH PRESSURE GAS POCKET FIGURE 8 D − Reversing Valve L1 and Solenoid DANGER A refrigerant reversing valve with electro−mechanical solenoid is used to reverse refrigerant flow during unit Make sure all power is disconnected before operation.
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Page 8: Ii Refrigerant System
II − REFRIGERANT SYSTEM TPA*S4 COOLING CYCLE (SHOWING MANIFOLD GAUGE CONNECTIONS) OUTDOOR UNIT DEFROST THERMOSTAT DISTRIBUTOR REVERSING VALVE EXPANSION/CHECK VALVE BI−FLOW OUTDOOR FILTER / DRIER COIL INDOOR UNIT HIGH PRESSURE PRESSURE MUFFLER GAUGE MANIFOLD SUCTION SERVICE VAPOR PORT LINE LIQUID LINE VALVE SERVICE COMPRESSOR... - Page 9 A − Plumbing LIQUID LINE SERVICE VALVE (VALVE OPEN) Field refrigerant piping consists of liquid and vapor lines from the outdoor unit (sweat connections). Use Lennox INSERT HEX L15 (sweat) series line sets as shown in table 2. WRENCH HERE...
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Page 10: Iii Charging
Vapor Line (Ball Type) Service Valve DANGER 5 ton unit only When using dry nitrogen, a pressure reducing regu- A ball-type full service valve is used on TPA060S4N4xY lator must be used to prevent excessive pressure in units only. Valves are not re−buildable. If a valve has failed it gauge manifold, connecting hoses, and within the must be replaced. - Page 11 D − Charging TPA*S4N41Y through Blocking Outdoor Coil TPA*S4N42Y The outdoor unit should be charged during warm weather. However, applications arise in which charging must occur *Outdoor coil should be blocked one side at a time with cardboard or plastic in the colder months.
- Page 12 TABLE 5 IMPORTANT TPA*S4N41Y through TPA*S4N42Y Use table 4 as a general guide when performing TPA036S4 Approach Values for Charging maintenance checks. This is not a procedure for charging the unit (Refer to Charging / Checking _ Liquid Line Temperature Charge section).
- Page 13 Step 1. Determine the desired DT Measure entering air tempera- Temp. ture using dry bulb (A) and wet bulb (B). DT is the intersecting value 24 24 24 23 23 22 22 22 20 19 18 17 16 15 of air entering of A and B in the table (see triangle).
- Page 14 (table 6) (table 8) charge the Lennox recommended indoor unit matchups along with the charge levels for the various sizes of outdoor units. Table 7. Normal Operating Pressures − Liquid +10 and Vapor +5 PSIG* IMPORTANT Use table 4 as a general guide when performing maintenance checks. This is not a procedure for charging the unit (Refer to Charging / Checking Charge section).
- Page 15 Table 8. Adding Charge per Indoor Unit Matchup using Subcooling Method 1. Check the airflow (figure 15, Page 13) to be sure the indoor airflow is as required. (Make any air flow adjustments before continuing with the following procedure.) cooling 2.
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Page 16: Iv Maintenance
Table 11. TPA048S4N43Y Table 13. HFC−410A Temp. (°F) − Pressure (Psig) Target *Add °F Psig °F Psig °F Psig °F Psig Subcooling charge INDOOR MATCHUPS Heat Heat Cool Cool −40 10.1 80.5 158.2 278.2 (+5ºF) (+1ºF) −35 13.5 82.3 282.3 CBX26UH−048 −30 17.2... - Page 17 V − WIRING DIAGRAM AND SEQUENCE OF OPERATION TPA*S4 230 VOLT UNIT DIAGRAM COOLING: DEFROST MODE: Internal thermostat wiring energizes terminal O by cooling During heating operation when outdoor coil temperature drops below mode selection, energizing the reversing valve L1. 35°F (2°C) or 42°F (5.5°C)defrost switch (thermostat) S6 closes.
- Page 18 TPA*S4 460 VOLT UNIT DIAGRAM COOLING: Internal thermostat wiring energizes terminal O by cooling mode selection, energizing the reversing valve L1. 1− Demand initiates at Y1 in the thermostat. DEFROST MODE: 2− Assuming high pressure switch S4 and low pressure During heating operation when outdoor coil temperature drops below switch S87 are closed, 24VAC energizes compressor 35°F (2°C) or 42°F (5.5°C)defrost switch (thermostat) S6 closes.