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E2006 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, ser-
vice or maintenance can cause personal injury, loss
of life, or damage to property.
Installation and service must be performed by a
qualified installer or service agency.
CAUTION
Physical contact with metal edges and corners
while applying excessive force or rapid motion can
result in personal injury. Be aware of, and use
caution when working near these areas during
installation or while servicing this equipment.
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.
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.
08/06
*2P0806*
INSTALLATION
INSTRUCTIONS
HPXA16 Series Units
HEAT PUMP UNITS
504,954M
08/06
Supersedes 03/06
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HPXA16 Outdoor Unit
Lennox HPXA16 outdoor units use HFC−410A refrigerant.
This unit must be installed with a matching indoor coil and
line set as outlined in the Lennox Engineering Handbook.
®
Elite
Series HPXA16 outdoor units are designed for use
in check expansion valve (CTXV) systems only and must
not be used with other refrigerant flow control devices.
See Lennox Engineering Handbook list of indoor expan-
sion valve kits (ordered separately).
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504,954M
*P504954M*
Litho U.S.A.
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Table of Contents
Related Manuals for Lennox HPXA16-024
Summary of Contents for Lennox HPXA16-024
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Page 1: Table Of Contents
Lennox HPXA16 outdoor units use HFC−410A refrigerant. This unit must be installed with a matching indoor coil and IMPORTANT line set as outlined in the Lennox Engineering Handbook. ® Elite Series HPXA16 outdoor units are designed for use The Clean Air Act of 1990 bans the intentional vent- in check expansion valve (CTXV) systems only and must ing of refrigerant (CFC’s, HFC’s, and HCFC’s) as of... -
Page 2: Shipping & Packing List
Sheet metal screws 16 in.− lb. 2 NM your supervisor. Machine screws #10 28 in.− lb. 3 NM Lennox Industries Inc. Compressor bolts 90 in.− lb. 10 NM P.O. Box 799900 Dallas, TX 75379−9900 Gauge port seal cap 8 ft.− lb. -
Page 3: Parts Arrangement
Parts Arrangement RUN CAPACITOR START CAPACITOR (−024 UNIT ONLY) DEFROST CONTROL CHARGE COMPENSATOR (−048 UNITS) TXV/CHECK VALVE DISCHARGE LINE CONTACTOR COMPRESSOR TERMINAL PLUG VAPOR VALVE AND GAUGE PORT VAPOR LINE TWO−STAGE COMPRESSOR LOW PRESSURE SWITCH FILTER DRIER DISCHARGE TEMPERATURE SENSOR HIGH PRESSURE SWITCH Figure 1 Setting the Unit... -
Page 4: Electrical
Slab Mounting Refer to the furnace or blower coil installation instructions for additional wiring application diagrams and refer to unit When installing unit at grade level, top of slab should be nameplate for minimum circuit ampacity and maximum high enough above the grade so that water from higher overcurrent protection size. - Page 5 HPXA16 Outdoor Unit and CB31MV/CB32MV HPXA16 Outdoor Unit and Blower Unit Thermostat Designations Thermostat Designations (Some connections may not apply. Refer to specific thermostat (Some connections may not apply. Refer to specific thermostat and indoor unit.) CB31MV / SignatureStat and indoor unit.) Outdoor Unit CBX32MV TB1 A2 Thermostat...
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Page 6: Refrigerant Piping
Field refrigerant piping consists of liquid and vapor lines from the outdoor unit (sweat connections) to the indoor coil (flare or sweat connections). Use Lennox L15 (sweat, non- Outside Unit Placement and Installation flare) series line sets as shown in table 2 or use field-fabri- cated refrigerant lines. - Page 7 Refrigerant Line Sets: Installing 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. WOOD BLOCK BETWEEN STUDS WIRE TIE...
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Page 8: Refrigerant Metering Device
Check Expansion Valve Systems traps. Check expansion valves equipped with either Chatleff or Polyol ester (POE) oils are used in Lennox units flare−type fittings are available from Lennox. Refer to the charged with HFC−410A refrigerant. Residual min- Engineering Handbook for applicable expansion valves for eral oil can act as an insulator, preventing proper use with specific match-ups. - Page 9 If the existing outdoor unit is equipped with IMPORTANT manual shut−off valves AND you plan to use NEW HCFC−22 refrigerant to flush the system − The Environmental Protection Agency prohibits the Start the existing HCFC−22 system in the cooling intentional venting of HFC refrigerants during main- mode and close the liquid line valve.
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Page 10: Manifold Gauge Set
5. Remove the pressure tap valve cores from the HPXA16 unit’s service valves. Connect an HCFC−22 Front-Seated Liquid Line Service Valve cylinder with clean refrigerant to the vapor service (Valve Shown Closed) SERVICE valve. Connect the HCFC−22 gauge set to the liquid PORT Insert hex wrench here line valve and connect a recovery machine with an... -
Page 11: Leak Testing
IMPORTANT WARNING Fire, Explosion and Personal Safety Service valves are closed to the outdoor unit and Hazard. open to line set connections. Do not open until re- frigerant lines have been leak tested and evacuated. Failure to follow this warning could All precautions should be exercised in keeping the result in damage, personal injury or system free from dirt, moisture and air. -
Page 12: Evacuation
gauge valves to release the dry nitrogen from the line Evacuation set and indoor unit. Evacuating the system of noncondensables is critical for 8. Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set proper operation of the unit. - Page 13 HPXA16 Cooling Cycle (Showing Gauge Manifold Connections) DISTRIBUTOR OUTDOOR UNIT NOTE − ARROWS INDICATE DIRECTION OF REFRIGERANT FLOW REVERSING VALVE EXPANSION/ CHECK VALVE BIFLOW FILTER / DRIER OUTDOOR COIL HUGH PRESSURE PRESSURE INDOOR UNIT MUFFLER VAPOR GAUGE MANIFOLD SERVICE VAPOR VAPOR PORT SERVICE...
- Page 14 1. With the manifold gauge hose still on the liquid service frigerant. Be aware of the HFC−410A refrigerant cylin- port and the unit operating stably, use a digital ther- der. It will be light maroon−colored. Refrigerant should mometer to record the liquid line temperature. be added through the vapor line valve in the liquid 2.
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Page 15: System Operation
Table 6 5. The difference between the ambient and liquid temperatures should match values given in table 8. If HPXA16 Normal Operating Pressures the values don’t agree with the those in table 8, add COOLING (Liquid ±10 & Vapor ±5 psig)* refrigerant to lower the approach temperature or recover refrigerant from the system to increase the −024... -
Page 16: Defrost System
Defrost Board Pressure Switch Connections Defrost System The unit’s automatic reset pressure switches (LO PS − S87 and HI PS − S4) are factory−wired into the defrost board on Defrost System Description the LO−PS and HI−PS terminals, respectively. The demand defrost controller measures differential tem- Low Pressure Switch (LO−PS) When the low pressure peratures to detect when the system is performing poorly switch trips, the defrost board will cycle off the compressor,... - Page 17 NOTE − When checking the ohms across a sensor, be Table 9 aware that a sensor showing a resistance value that is not Sensor Temperature / Resistance Range within the range shown in table 9, may be performing as Pins/W designed.
- Page 18 Defrost System Sensors If first-stage compressor output is active in heating mode and the outdoor ambient temperature is below the selected Ambient Sensor The ambient sensor considers out- compressor lock−in temperature, the second-stage com- door temperatures below −35°F (−37°C) or above 120°F pressor solenoid output will be energized without the Y2"...
- Page 19 Time If 6 hours of heating mode compressor run time after 34 minutes of run time. has elapsed since the last defrost cycle while the coil tem- Test Mode [NOTE − Coil sensor temperature must be perature remains below 35°F (2°C), the demand defrost below 35ºF before the defrost board will initiate a control will initiate a defrost cycle.
- Page 20 Table 10 Defrost Control Board Diagnostic LEDs Green Condition/Code Possible Cause(s) Solution 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 21: Maintenance
Sound cover be compared with those given on unit nameplate. Low ambient kit Check, clean (or replace) indoor unit filters. Monitor kit Check the refrigerant charge and gauge the system Dave Lennox SignatureStat Room Thermostat pressures. Page 21 HPXA16 SERIES... -
Page 22: Check Points
Start−Up and Performance Check List Job Name Job no. Date Job Location City State Installer City State Unit Model No. Serial No. Service Technician Nameplate Voltage Rated Load Ampacity Compressor Amperage: 1st Stage 2nd Stage: Maximum Fuse or Circuit Breaker Electrical Connections Tight? - Indoor Filter clean? - Supply Voltage (Unit Off) -
Page 23: Homeowner Information: Maintenance
Sprinklers and soaker hoses should not be installed where they could cause prolonged exposure to the 1. Ask your Lennox dealer to show you where your indoor outdoor unit by treated water. Prolonged exposure unit’s filter is located. It will be either at the indoor unit of the unit to treated water (i.e., sprinkler systems,... -
Page 24: Thermostat Operation
Programmable Thermostats heating and cooling. Avoid frequent temperature adjust- Your Lennox system may be controlled by a program- ment; turning the unit off and back on before pressures mable thermostat. These thermostats provide the added equalize puts stress on the unit compressor.