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E2002 Lennox Industries Inc.
Dallas, Texas
HPXA15 Outdoor Unit
HPXA15 outdoor units use R410A which is an ozone
friendly HFC refrigerant. This unit must be installed with a
matching indoor coil and line set as outlined in the Lennox
Engineering Handbook. HPXA15 outdoor units are de-
signed for use in expansion valve (TXV) systems only.
They are not designed to be used with other refrigerant flow
control devices. An expansion valve approved for use with
R410A has been shipped with the unit and must be
installed prior to operating the unit.
Shipping and Packing List
1 − Assembled HPXA15 outdoor unit
2 − Grommets (for liquid and vapor lines)
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
General Information
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
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.
02/04
*2P0204*
INSTALLATION
INSTRUCTIONS
HPXA15 SERIES UNITS
HEAT PUMP UNITS
504,713M
02/04
Supersedes 12/02
Table of Contents
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RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox' Engineering Handbook. Coils
previously charged with R22 must be flushed.
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
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WARNING
504,713M
*P504713M*
Litho U.S.A.
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Table of Contents
Related Manuals for Lennox HPXA15-024
Summary of Contents for Lennox HPXA15-024
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Page 1: Table Of Contents
HPXA15 Check Points ......matching indoor coil and line set as outlined in the Lennox RETAIN THESE INSTRUCTIONS Engineering Handbook. -
Page 2: Dimensions
1-3/8 (51) (35) (51) Service Access Side View Model No. 27-7/8 25-7/8 29-7/8 12-1/4 22-7/16 14-7/16 22-1/8 16-3/4 2-7/8 5-1/2 HPXA15 024 HPXA15-024 30-7/8 32-1/8 34-1/16 12-3/4 26-5/8 18-5/8 28-1/8 17-1/4 3-7/8 7-1/2 HPXA15-030 HPXA15-030 HPXA15-036 34-7/8 32-1/8 34-1/16 13-3/4... -
Page 3: Parts Arrangement
Parts Arrangement defrost control/timed−off control contactor dual capacitor ground lug high pressure sensing bulb switch compressor vapor line service valve filter/drier and gauge port liquid line expansion valve service valve with internal check valve and gauge port defrost crankcase heater thermostat thermostat (2−1/2 through... -
Page 4: Electrical
5 − Locate unit away from overhanging roof lines which Rooftop Application would allow water or ice to drop on, or in front of, coil or Wind Barrier Construction into unit. prevailing winter winds Slab Mounting wind barrier When installing unit at grade level, top of slab should be inlet air high enough above the grade so that water from higher 24"... - Page 5 NOTE − To facilitate conduit, a hole is in the bottom of side the unit control box cover. the control box. Connect conduit to the control box us 3 − Install room thermostat (ordered separately) on an in- ing a proper conduit fitting. side wall approximately in the center of the conditioned NOTE −...
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Page 6: Refrigerant Piping
(Some connections may not apply. Field refrigerant piping consists of liquid and vapor lines Refer to specific thermostat and indoor unit.) from the outdoor unit (sweat connections) to the indoor coil (flare or sweat connections). Use Lennox L15 (sweat, non- Outdoor Indoor Thermostat... - Page 7 1- Placement − Be aware some localities are adopting 2- Line Set Isolation − The following illustrations demon- sound ordinances based on how noisy the unit is from strate procedures which ensure proper refrigerant line the adjacent property not at the original installation. set isolation.
- Page 8 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 9 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 10: Flushing Existing Line Set & Indoor Coil
Refrigerant Metering Device Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HPXA15 units are used in check expansion valve systems R410A refrigerant. Residual mineral oil can act as an only. - Page 11 frigerant evacuation.) When the low side system pres- Required Equipment sures reach 0 psig, close the vapor line valve. You will need the following equipment in order to flush the Disconnect all power to the existing outdoor unit. Re- existing line set and indoor coil: two clean R22 recovery fer to gauges after shutdown to confirm that the valves bottles, an oilless recovery machine with a pump down fea- are not allowing refrigerant to flow back into the low...
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Page 12: Manifold Gauge Set
4 − Remove the pressure tap valve cores from the Each valve is equipped with a service port which has a fac- tory−installed Schrader valve. A service port cap protects HPXA15 unit’s service valves. Connect an R22 cylin- the Schrader valve from contamination and serves as the der with clean refrigerant to the vapor service valve. -
Page 13: Leak Testing
Leak Testing Liquid Service Valve (Valve Open) After the line set has been connected to the indoor and out- Insert Hex door units, the line set connections and indoor unit must be Stem Cap Wrench Here checked for leaks. Field Side WARNING Refrigerant can be harmful if it is inhaled. -
Page 14: Evacuation
7 − After a few minutes, open a refrigerant port to ensure WARNING the refrigerant you added is adequate to be detected. (Amounts of refrigerant will vary with line lengths.) Danger of Equipment Damage. Check all joints for leaks. Purge nitrogen and R410A Avoid deep vacuum operation. -
Page 15: Charging
5 − The outdoor temperature will determine which charg- Charging ing method to use. Proceed with the appropriate charg- This system is charged with R410A refrigerant which oper- ing procedure. ates at much higher pressures than R22. The check/ex- Weighing in the Charge TXV Systems – pansion valve provided with the unit is approved for use Outdoor Temp <... - Page 16 will be light maroon−colored. Refrigerant should be Pressures higher than those listed indicate that the system is overcharged. Pressures lower than those added through the vapor line valve in the liquid state. listed indicate that the system is undercharged. Verify Some R410A cylinders are equipped with a dip adjusted charge using the approach method.
- Page 17 HPXA15 Cooling Cycle (Showing Gauge Manifold Connections) OUTDOOR UNIT DEFROST THERMOSTAT DISTRIBUTOR NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW REVERSING VALVE EXPANSION/ CHECK VALVE BIFLOW OUTDOOR FILTER / COIL DRIER HIGH INDOOR UNIT PRESSURE PRESSURE MUFFLER GAUGE MANIFOLD VAPOR SERVICE VAPOR PORT...
- Page 18 Table 6 R410A 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 19: System Operation
Defrost Control System Operation The defrost control board includes the combined func- The outdoor unit and indoor blower cycle on demand from tions of a time/temperature defrost control, defrost the room thermostat. When the thermostat blower switch is relay, time delay, diagnostic LEDs, and a terminal strip in the ON position, the indoor blower operates continuously. - Page 20 pressure switch after the third occurrence of an open pres- which might cause thermostat droop. The service light thermostat provides a signal which activates the room ther- sure switch. See table 7. The unit will remain locked out un- mostat service light during periods of inefficient operation. til power is broken then remade to the control or until the jumper is applied to the TEST pins for 0.5 seconds.
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Page 21: Maintenance
Electric shock hazard. Can cause inju- 1 − Clean or change filters. ry or death. Before attempting to per- 2 - Lennox blower motors are prelubricated and permanent- form any service or maintenance, turn ly sealed. No more lubrication is needed.