Lennox HPXA12 Series Unit Information
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Also See for HPXA12 Series:
- Homeowner's manual (4 pages) ,
- Installation instructions manual (24 pages)
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Service Literature
The HPXA12 is a high efficiency residential split−system
heat pump unit, which features a scroll compressor and
R410A refrigerant. HPXA12 units are available in sizes
ranging from 1 1/2 through 5 tons. The series is designed
for use with an expansion valve only (approved for use with
R410A) in the indoor unit.This manual is divided into sec-
tions which discuss the major components, refrigerant sys-
tem, charging procedure, maintenance and operation se-
quence.
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 R410A unit are higher
than pressures in R22 units. Always use service
equipment rated for R410A.
WARNING
Warranty will be voided if covered equipment is re-
moved from original installation site. Warranty will
not cover damage or defect resulting from:
Flood, wind, lightning, or installation and opera-
tion in a corrosive atmosphere (chlorine, fluorine,
salt, recycled waste water, urine, fertilizers, or oth-
er damaging chemicals).
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.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
Corp. 0208−L3
Revised 09−2004
HPXA12 SERIES UNITS
Page 1
HPXA12
TABLE OF CONTENTS
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©2002 Lennox Industries Inc.
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Summary of Contents for Lennox HPXA12 Series
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Page 1: Table Of Contents
HPXA12 Corp. 0208−L3 Revised 09−2004 Service Literature HPXA12 SERIES UNITS The HPXA12 is a high efficiency residential split−system heat pump unit, which features a scroll compressor and R410A refrigerant. HPXA12 units are available in sizes ranging from 1 1/2 through 5 tons. The series is designed for use with an expansion valve only (approved for use with R410A) in the indoor unit.This manual is divided into sec-... -
Page 2: General
SPECIFICATIONS single phase General Model No. HPXA12−018 HPXA12−024 HPXA12−030 HPXA12−036 Data Nominal Tonnage (kW) 1.5 (5.3) 2 (7.0) 2.5 (8.8) 3 (10.6) Connections Liquid line o.d. − in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) (sweat) (sweat) Vapor line o.d. − in. (mm) 3/4 (19.1) 3/4 (19.1) 3/4 (19.1) - Page 3 SPECIFICATIONS single phase Cont. General Model No. HPXA12−042 HPXA12−048 HPXA12−060 Data Nominal Tonnage (kW) 3.5 (12.3) 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) (sweat) Vapor line o.d. − in. (mm) 7/8 (22.2) 7/8 (22.2) 1−1/8 (28.6)
- Page 4 SPECIFICATIONS three phase General Model No. HPXA12−036 HPXA12−048 HPXA12−060 Data Nominal Tonnage (kW) 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) (sweat) (sweat) Vapor line o.d. − in. (mm) 7/8 (22.2) 7/8 (22.2) 1−1/8 (28.6)
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Page 5: I Unit Information
GROUNDING All major components (indoor blower and coil) must be (A108) matched according to Lennox recommendations for the compressor to be covered under warranty. Refer to the En- gineering Handbook for approved system matchups. A missapplied system will cause erratic operation and can re- sult in early compressor failure. - Page 6 3. Fan motor nameplate will have capacitor ratings. 4 − Dual Capacitor C12 The compressor and fan in single phase HPXA12 series units use permanent split capacitor motors. The capacitor is located inside the unit control box (see figure 2). A single dual" capaci- tor (C12) is used for both the fan motor and the compressor (see unit wiring diagram).
- Page 7 HI−PS/LO−PS Terminals If a pressure switch becomes open while the Y1 Out line is engaged, a 5 minute short cycle will occur after the High pressure switch (S4) is factory wired into the defrost switch closes. board HI−PS terminals. When (S4) trips, the defrost board Operational Description will cycle off the compressor and the strike counter in the The demand defrost board has three basic operational...
- Page 8 Demand Defrost Operation tem temperatures during the 20−minute calibration period. If the board fails to calibrate, another defrost cycle will be The demand defrost control board initiates a defrost cycle initiated after 90 minutes of heating mode compressor run based on either frost detection or time. time.
- Page 9 Table 1 Defrost Control Board Diagnostic Led LED 1 LED 2 Condition Possible Cause(s) Solution Check control transformer pow- No power (24V) to board termi- er (24V). nals R & C. Power problem If power is available and Board failure. LED(s) are unlit, replace board and all sensors.
- Page 10 If the compressor is re- be hot since it is in constant contact with discharge gas. placed, conventional Lennox cleanup practices must be used. Due to its efficiency, the scroll compressor is capable of draw-...
- Page 11 SUCTION SUCTION INTERMEDIATE PRESSURE ORBITING SCROLL CRECENT SHAPED GAS POCKET STATIONARY SCROLL SUCTION POCKET FLANKS SEALED BY CENTRIFIGUAL SUCTION SUCTION FORCE MOVEMENT OF ORBIT DISCHARGE HIGH PRESURE GAS POCKET FIGURE 10 Three-Phase Compressor Rotation CONDENSER FAN MOTOR Three-phase scroll compressors must be phased sequen- AND COMPRESSOR ACCESS tially to ensure correct compressor rotation and operation.
- Page 12 The switch is normally closed and is permanently adjusted to be taken to determine if excessive moisture has been trip (open) at 640 + 10 psi. introduced to the oil. Table 2 lists kits available from Lennox An auto-reset, single-pole/single-throw low pressure to check POE oils.
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Page 13: Refrigerant System
III − REFRIGERANT SYSTEM Refer to figure 12 and 13 for refrigerant flow in the heat- ing and cooling modes. The reversing valve is energized during cooling demand and during defrost. HPXA12 COOLING CYCLE (SHOWING MANIFOLD GAUGE CONNECTIONS) OUTDOOR UNIT DISTRIBUTOR COIL SENSOR REVERSING VALVE... - Page 14 A − Plumbing Service Valve (Valve Closed) Field refrigerant piping consists of liquid and vapor lines from the outdoor unit (sweat connections). Use Lennox stem cap L15 (sweat) series line sets as shown in table 3. service port TABLE 3...
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Page 15: Warning
3 − Open the high pressure side of the manifold to allow the Ball Valve (Valve Open) R410A into the line set and indoor unit. Weigh in a trace Use Adjustable Wrench amount of HCFC-22. [A trace amount is a maximum of To open: rotate Stem Clockwise 90°. - Page 16 If line length is less than 15 ft. (4.5 m), subtract this amount. CAUTION Units are designed for line sets up to 50 feet (15.2 m). Con- sult Lennox Refrigeration Piping Manual for line sets over Danger of Equipment Damage. 50 feet (15.2 m).
- Page 17 If the system is completely void of refrigerant, the recom- BLOCKING OUTDOOR COIL mended and most accurate method of charging is to weigh the refrigerant into the unit according to the total amount OUTDOOR COIL SHOULD BE BLOCKED ONE SIDE shown on the unit nameplate.
- Page 18 TABLE 7 NORMAL OPERATING PRESSURES Cooling Operation Outdoor Coil HPXA12−18 HPXA12−24 HPXA12−30 HPXA12−36 HPXA12−42 HPXA12−48 HPXA12−60 E t i Entering Air Liquid Vapor Liquid Suction Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Temp. °F (°C) 65 (18.3) 75 (23.9) 85 (29.4) 95 (35.0)
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Page 19: Service And Recovery
V − SERVICE AND RECOVERY VI − MAINTENANCE In order to maintain the warranty on this equipment, the HPXA12 system must be serviced annually and a record of service maintained. The following should be checked be- WARNING tween annual maintenance: A −... -
Page 20: Wiring Diagram And Operating Sequence
VII − WIRING DIAGRAM AND SEQUENCE OF OPERATION HPXA12 1.5 THROUGH 5 TON UNIT WIRING Single Phase 230V Page 20... - Page 21 HPXA12 3 THROUGH 5 TON UNIT WIRING Three Phase 230V Page 21...
- Page 22 HPXA12 3 THROUGH 5 TON UNIT WIRING Three Phase 460V Page 22...
- Page 23 HPXA12 1.5 THROUGH 5 TON OPERATING SEQUENCE Single and Three Phase This is the sequence of operation for HPXA12 series units. FIRST STAGE HEAT: The sequence is outlined by numbered steps which corre- 9 − Heating demand initiates at Y1.