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E2002 Lennox Industries Inc.
Dallas, Texas
HPXA12 Outdoor Unit
®
HPXA12 Elite
outdoor units use R410A, which is an ozone
friendly HFC refrigerant. This unit must be installed with a
matching indoor blower coil and line set as outlined in the
Lennox Engineering Handbook. HPXA12 outdoor units are
designed for use in expansion valve systems only. They
are not designed to be used with other refrigerant flow con-
trol devices. An expansion valve approved for use with
R410A must be ordered separately and must be installed
prior to operating the unit.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox' Engineering Handbook. Coils
previously charged with R22 must be flushed
Shipping & Packing List
1 − Assembled HPXA12 outdoor unit
Check the unit components for shipping damage. If you find
any damage, immediately contact the last carrier.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent-
ing of refrigerant (CFC's, HFC's, and HCFC's) as of
July 1, 1992. Approved methods of recovery, recycl-
ing or reclaiming must be followed. Fines and/or in-
carceration may be levied for noncompliance.
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.
05/04
*2P0504*
®
INSTALLATION
INSTRUCTIONS
HPXA12 SERIES UNITS
HEAT PUMP UNITS
504,777M
05/04
Supersedes 02/04
Table of Contents
HPXA12 Outdoor Unit
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Shipping & Packing List
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General Information
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RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
General Information
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
WARNING
This product and/or the indoor unit it is matched with
may contain fiberglass wool.
Disturbing the insulation during installation, mainte-
nance, or repair will expose you to fiberglass wool
dust. Breathing this may cause lung cancer. (Fiber-
glass wool is known to the State of California to
cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact your
supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
Litho U.S.A.
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504,777M
*P504777M*
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Table of Contents
Related Manuals for Lennox HPXA12 SERIES
Summary of Contents for Lennox HPXA12 SERIES
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Page 1: Table Of Contents
Defrost System ....... Lennox Engineering Handbook. HPXA12 outdoor units are Maintenance . -
Page 2: Unit Dimensions
Unit Dimensions − inches (mm) INLET Model No. HPXA12−018 24-1/4 33−1/4 32-1/2 HPXA12−024 HPXA12 030 HPXA12−030 INLET INLET HPXA12−036 HPXA12−042 28-1/4 37−1/4 36-1/2 HPXA12−048 HPXA12−048 HPXA12−060 VAPOR LINE CONNECTION LIQUID LINE CONNECTION INLET Top View DISCHARGE OUTDOOR COIL FAN COMPRESSOR VAPOR &... -
Page 3: Setting The Unit
4 - When installed in areas where low ambient tempera- Setting the Unit tures exist, locate unit so winter prevailing winds do not blow directly into outdoor coil. CAUTION 5 - Locate unit away from overhanging roof lines which would allow water or ice to drop on, or in front of, coil or In order to avoid injury, take proper precaution when into unit. -
Page 4: Electrical
If unit coil cannot be mounted away from prevailing winter 1 − Install line voltage power supply to unit from a properly winds, construct a wind barrier. Size barrier at least the sized disconnect switch. same height and width as the outdoor unit. Mount barrier 24 2 −... -
Page 5: Refrigerant Piping
HPXA12 and Blower Unit from the outdoor unit (sweat connections) to the indoor coil Thermostat Designations (flare or sweat connections). Use Lennox L15 (sweat, non- (Some connections may not apply. flare) series line sets as shown in table 1 or use field-fabri- Refer to specific thermostat and indoor unit.) - Page 6 Refrigerant Line Sets How To Install Vertical Runs (new construction shown) NOTE - Similar installation practices should be used if line set is to be installed on exterior of outside wall. IMPORTANT - Refrigerant Outside Wall Vapor Line Liquid Line lines must not contact wall.
- Page 7 Refrigerant Line Sets: Installing Horizontal Runs To hang line set from joist or rafter, use either metal strapping material Wire Tie or anchored heavy nylon wire ties. (around vapor line only) 8 feet Floor Joist or Roof Rafter Tape or Wire Tie 8 feet Strapping Material (around vapor line only) Metal Sleeve...
- Page 8 Refrigerant Line Sets: Transition From Vertical To Horizontal Automotive Anchored Heavy Muffler-Type Nylon Wire Tie Hanger Wall Wall Stud Stud Strap Liquid Line Strap Liquid Line To Vapor Line To Vapor Line Liquid Line Vapor Line Metal Vapor Line Wrapped in Metal Sleeve Liquid Line...
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Page 9: Flushing Existing Line Set & Indoor Coil
Take care to empty all existing traps. connections. Polyol ester (POE) oils are used in Lennox units charged with R410A refrigerant. Residual mineral oil can act as an insulator, preventing proper heat transfer. - Page 10 gauges after shutdown to confirm that the valves are 3 − Remove the existing refrigerant flow control orifice or not allowing refrigerant to flow back into the low side of thermal expansion/check valve before continuing with the system. Disconnect the liquid and vapor lines from flushing procedures.
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Page 11: Refrigerant Metering Device
See table 3 for torque re- Check expansion valves equipped with either Chatleff or quirements. flare−type fittings are available from Lennox. Refer to the Each valve is equipped with a service port which has a fac- Engineering Handbook for applicable expansion valves tory−installed Schrader valve. - Page 12 Table 3 Service Valve Torque Requirements (Valve Closed) Part Recommended Torque stem cap service Service valve cap 8 ft.− lb. 11 NM port Sheet metal screws 16 in.− lb. 2 NM insert hex Machine screws #10 28 in.− lb. 3 NM wrench here to outdoor coil Compressor bolts...
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Page 13: Leak Testing
To Close Service Valve: WARNING 1 − Remove stem cap with an adjustable wrench. 2 − Use a service wrench with a hex head extension to turn Danger of explosion: Can cause the stem clockwise to seat the valve. Tighten firmly. equipment damage, injury or death. -
Page 14: Evacuation
Evacuation WARNING Evacuating the system of noncondensables is critical for Danger of Equipment Damage. proper operation of the unit. Noncondensables are defined Avoid deep vacuum operation. Do not use com- as any gas that will not condense under temperatures and pressors to evacuate a system. - Page 15 6 − Set the thermostat for a cooling demand, turn on power based on a matching indoor coil and outdoor coil with a 15 foot (4.6 m) line set. For varying lengths of line set, refer to to indoor blower unit and close the outdoor unit discon- table 2 for refrigerant charge adjustment.
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Page 16: Charging
The outdoor unit should be charged during warm weather. Blocking Outdoor Coil However, applications arise in which charging must occur in the colder months. The method of charging is deter- *Outdoor coil should be blocked one side mined by the unit’s refrigerant metering device and the at a time with cardboard outdoor ambient temperature. - Page 17 3 − Compare stabilized pressures with those provided in Table 6 table 7, Normal Operating Pressures." Minor varia- Approach Values for Charging tions in these pressures may be expected due to differ- Model Number Approach Temperature ences in installations. Significant differences could Liquid Line Temp.
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Page 18: System Operation
Table 8 R410A Temperature/Pressure Chart Temp.°F Pressure Psig Temp.°F Pressure Psig Temp. °F Pressure Psig Temp. °F Pressure Psig 100.8 178.5 290.8 445.9 102.9 181.6 295.1 451.8 105.0 184.3 299.4 457.6 107.1 187.7 303.8 463.5 109.2 190.9 308.2 469.5 111.4 194.1 312.7 475.6... -
Page 19: Defrost System
High Pressure Switch Defrost System The HPXA12 is equipped with an auto−reset high pressure Low Pressure Switch switch (single−pole, single−throw) which is located on the The HPXA12 is equipped with an auto−reset low pressure liquid line. The switch shuts off the compressor when dis- switch which is located on the vapor line. - Page 20 Demand Defrost System 5−Strike Lockout Feature The internal control logic of the board counts the pres- The demand defrost controller uses basic differential tem- sure switch trips only while the Y1 (Input) line is active. If perature means to detect when the system performs poor- a pressure switch opens and closes twice during a Y1 ly because of ice build−up on the outdoor coil.
- Page 21 Table 9 Defrost Control Board Diagnostic Led LED 1 LED 2 Condition Possible Cause(s) Solution Check control transformer power No power (24V) to board terminals (24V). R & C. Power problem If power is available and LED(s) are Board failure. unlit, replace board and all sensors.
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Page 22: Maintenance
3 - Visually inspect all connecting lines, joints and coils for Ask your Lennox dealer to show you where your indoor evidence of oil leaks. unit’s filter is located. It will be either at the indoor unit 4 - Check all wiring for loose connections. - Page 23 The temperature indicator displays the actual room tem- frost cycle. perature. Your Lennox HPXA12 heat pump is equipped with a com- Programmable Thermostats pressor crankcase heater which protects the compressor Your Lennox system may be controlled by a programmable from refrigerant slugging during cold weather operation.
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Page 24: Hpxa12 Check List
HPXA12 Check List Start−Up and Performance Check List Job Name Date Job No. Job Location City State Installer City State Unit Model No. Serial No. Service Technician Nameplate Voltage Amps: 1st stage 2nd Stage Rated Load Ampacity Maximum Fuse or Circuit Breaker Electrical Connections Tight? Indoor Filter Clean? Supply Voltage (Unit Off)