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Service Literature
The HPXA16 is a high efficiency residential split−system
heat pump unit, which features a two−stage scroll compres-
sor and R−410A refrigerant. HPXA16 units are available in
2, 3, 4 and 5 ton sizes. The series is designed for use with
an expansion valve only (approved for use with R−410A) in
the indoor unit. This manual is divided into sections which
discuss the major components, refrigerant system, charg-
ing 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.
IMPORTANT
Operating pressures of this R−410A unit are higher
than pressures in R22 units. Always use service
equipment rated for R−410A.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent-
ing of (CFC's and HFC's) as of July 1, 1992. Approved
methods of recovery, recycling or reclaiming must
be followed. Fines and/or incarceration my be levied
for noncompliance.
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Corp. 0506−L2
Revised 07−2006
HPXA16 SERIES UNITS
Table of Contents
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Page 2
Page 3
Page 3
Page 14
Page 1
DANGER
Shock Hazard
Remove all power at disconnect be-
fore removing access panel.
HPXA16 units use single-pole con-
tactors. Potential exists for electrical
shock resulting in injury or death.
Line voltage exists at all components
(even when unit is not in operation).
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. . . . . . . . . . . . .
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VII Diagrams and Operating Sequence Page 22
HPXA16
Page 16
Page 21
Page 21
© 2005 Lennox Industries Inc.
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Related Manuals for Lennox HPXA16 Series
Summary of Contents for Lennox HPXA16 Series
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Page 1: Table Of Contents
....Page 21 III Refrigerant System ....Page 14 VII Diagrams and Operating Sequence Page 22 Page 1 © 2005 Lennox Industries Inc. -
Page 2: Specifications / Electrical Data
SPECIFICATIONS General Model No. HPXA16−024 HPXA16−036 HPXA16−048 HPXA16−060 Data Nominal Tonnage (kW) 2 (7.0) 3 (10.6) 4 (14.1) 5 (17.6) Connections Liquid line o.d. − in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) (sweat) Vapor line o.d. − in. (mm) 7/8 (22.2) 7/8 (22.2) 7/8 (22.2) -
Page 3: I Application
I−APPLICATION All major components (indoor blower and coil) must be matched according to Lennox recommendations for the SCROLL FORM compressor to be covered under warranty. Refer to the En- gineering Handbook for approved system matchups. A misapplied system will cause erratic operation and can re- sult in early compressor failure. - Page 4 ICI EMKARATEt RL32CF for use with these com- Indoor thermostat setting will determine first or second pressors. Lennox recommends adding 1 oz. of oil per addi- stage operation. The compressor will operate on first−stage tional 10 ft. for applications with line sets over 50 ft. See...
- Page 5 INTERNAL SOLENOID (L34) Procedure 1. Turn main power "OFF" to outdoor unit. The internal unloader solenoid controls the two−stage op- 2. Adjust room thermostat set point above (heating op- eration of the compressor by shifting a slide ring mecha- eration on heat pump) or below (cooling operation) the nism to close two by−pass ports in the first compression room temperature 5ºF.
- Page 6 TABLE 1 Compressor Operation Y1 − Y2 − Expected Results Unit Readings 1st-Stage 2nd-Stage Compressor Voltage Same Amperage Higher Condenser Fan motor Amperage Same or Higher Temperature Ambient Same Outdoor Coil Discharge Air Higher in Cooling Lower in Heating Compressor Discharge Line Higher Indoor Return Air Same...
- Page 7 B−Dual Capacitor (C12) TABLE 2 The compressor and fan in HPXA16 units use permanent HPXA16 UNIT "A" DIM. + 1/8" split capacitor motors. A single dual" capacitor is used for −024, −036 1 1/16" both the fan motor and the compressor (see unit wiring dia- −048 1 3/16"...
- Page 8 Vapor Line Vapor Line (To Outdoor Coil) (From Outdoor Coil) introduced to the oil. Table 3 lists kits available from Lennox Compensator Tank Compensator Tank to check POE oils. During cooling mode, the va-...
- Page 9 5−Strike Lockout Feature Defrost Control Board The internal control logic of the board counts the pres- Note − Component Locations Vary by Board Manufacture sure switch trips only while the Y1 (Input) line is active. If a pressure switch opens and closes four times during TEST PINS a Y1 (Input), the control logic will reset the pressure DEFROST...
- Page 10 Under certain ambient conditions, the internal cabinet tem- perature of the HPXA16−036 will affect the temperature DISCHARGE LINE & AMBIENT SENSOR LOCATION that is sensed by the coil sensor. This can set up a condition where the defrost board would not initiate a defrost. To overcome this issue, the coil sensor should be moved to the other side of the cabinet to a coil hairpin as shown in figure 14.
- Page 11 Defrost Temperature Termination Shunt (Jumper) Actuation When the reversing valve is de−energized, the Pins The defrost board selections are: 50, 70, 90, and Y1 circuit is energized, and the coil temperature is below 100°F (10, 21, 32 and 38°C). The shunt termination pin is 35°F (2°C), the board logs the compressor run time.
- Page 12 Test Mode Y1 Active ( 0" line inactive) Short test pins for longer Short test pins for more than 2.0 seconds than 1 second but less than 2.0 seconds Clear any short cycle lockout or 5 strike pressure fault lockout function. If in COOLING Mode If in HEATING Mode If in DEFROST Mode...
- Page 13 TABLE 5 Defrost Control Board Diagnostic LEDs (5−Strike) Condition Possible Cause(s) Solution Green Power problem No power (24V) to board termi- Check control transformer power (24V). nals R & C or board failure. If power is available to board and LED(s) do not light, replace board.
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Page 14: Refrigerant System
Field refrigerant piping consists of liquid and vapor lines (C7). The capacitor is located in the control box and wired from the outdoor unit (sweat connections). Use Lennox in parallel with the compressor side of the dual capacitor. C7 is de−energized by potential relay K31 when the com- L15 series line sets as shown in table 6. - Page 15 A−Service Valves The ball valve is equipped with a service port with a factory− installed Schrader valve. A service port cap protects the Access the liquid line and vapor line service valves (figures Schrader valve from contamination and assures a leak− 18 and 19) and gauge ports are used for leak testing, eva- free seal.
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Page 16: Charging
IV−CHARGING 5 − Connect the manifold gauge set high pressure hose to the vapor valve service port. (Normally, the high pres- Units are factory charged with the amount of R−410A refrig- sure hose is connected to the liquid line port; however, erant indicated on the unit rating plate. - Page 17 Attach the manifold center port hose to a nitrogen cylin- Weighing in the Charge TXV Systems – der with pressure regulator set to 150 psig (1034 kPa) Outdoor Temp. < 65_F (18_C) and purge the hose. Open the manifold gauge valves If the system is void of refrigerant, or if the outdoor ambient to break the vacuum in the line set and indoor unit.
- Page 18 TABLE 9 Approach Method 2nd stage High Capacity 4 − Use the same digital thermometer used to check out- Subcooling Values door ambient temperature to check liquid line tempera- Model Number Conversion Temp. − Liquid Line Temp. °F (°C) ture. Verify the unit charge using the approach method. HPXA16−024 11.0 + 1 (6 + .5) 5 −...
- Page 19 TABLE 11 NORMAL OPERATING PRESSURES COOLING OPERATION (Liquid ±10 and Vapor ±5 psig) First Stage (Low Capacity) Outdoor Coil Outdoor Coil HPXA16−024 HPXA16−036 HPXA16−048 HPXA16−060 Entering Air Vapor Liquid Vapor Liquid Liquid Vapor Liquid Vapor Temp. °F (°C) 65 (18.3) 75 (23.9) 85 (29.4) 95 (35.0)
- Page 20 Table 13 R−410A Temperature/Pressure Chart Temperature Pressure Temperature Pressure Temperature Pressure Temperature Pressure °F Psig °F Psig °F Psig °F Psig 100.8 178.5 290.8 445.9 102.9 181.6 295.1 451.8 105.0 184.3 299.4 457.6 107.1 187.7 303.8 463.5 109.2 190.9 308.2 469.5 111.4 194.1...
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Page 21: Service And Recovery
1 − Clean or change filters. any time the sealed system is opened. 2 - Lennox blower motors are prelubricated and permanent- ly sealed. No more lubrication is needed. Any moisture not absorbed by the polyol ester oil can be re- 3 −... - Page 22 VII−DIAGRAM / OPERATING SEQUENCE Page 22...
- Page 23 Sequence of Operation HPXA16−024/060 3 − The defrost board sends 24 volts through Y2 OUT to the L34 compressor solenoid plug. The 2− wire com- First Stage Cool (low capacity) pressor solenoid plug converts the 24volt AC outputs Transformer from indoor unit supplies 24VAC power to to a 24volt DC signal input to the L34 internal high ca- the thermostat and outdoor unit controls.
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