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Page 5

NOTE − To facilitate conduit, a hole is in the bottom of 
the control box. Connect conduit to the control box us
ing a proper conduit fitting.

NOTE − Units are approved for use only with copper 
conductors.

24V, Class II circuit connections are made in the low 
voltage junction box. Refer to figure 5 for field wiring 
diagram.

NOTE − A complete unit wiring diagram is located in

side the unit control box cover.

 3 − Install room thermostat (ordered separately) on an in-

side wall approximately in the center of the conditioned
area and 5 feet (1.5 m) from the floor. It should not be
installed on an outside wall or where it can be effected
by sunlight, drafts or vibrations.

 4 − Install voltage wiring from outdoor to indoor unit and

from thermostat to indoor unit. See figures 6 and 7.

Typical Field Wiring Diagram

Figure 5

Summary of Contents for HPXA15 SERIES

Page 1: ...a qualified installer or service agency INSTALLATION INSTRUCTIONS HPXA15 SERIES UNITS HEAT PUMP UNITS 504 713M 02 04 Supersedes 12 02 Table of Contents HPXA15 Outdoor Unit 1 Shipping Packing List 1 G...

Page 2: ...in 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 mm 708 657 759 311 570 367 562 425 730 140 HPXA15 030 in 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...

Page 3: ...s 1 Place a sound absorbing material such as Isomode under the unit if it will be installed in a location or posi tion that will transmit sound or vibration to the living area or adjacent buildings 2...

Page 4: ...y support the unit Consult local codes for rooftop applications If unit coil cannot be mounted away from prevailing winter winds a wind barrier should be constructed See figure 3 Size barrier at least...

Page 5: ...eld wiring diagram NOTE A complete unit wiring diagram is located in side the unit control box cover 3 Install room thermostat ordered separately on an in side wall approximately in the center of the...

Page 6: ...Corp 9351 L9 for proper size type and application of field fabricated lines Valve sizes are also listed in table 1 Refrigerant Connections HPXA15 Matched with New Indoor Coil and Line Set If an existi...

Page 7: ...ure 9 shows how to install line sets on horizontal runs Figure 10 shows how to make a transi tion from horizontal to vertical Finally figure 11 shows how to place the outdoor unit and line set Refrige...

Page 8: ...ire Tie Wire Tie around vapor line only Floor Joist or Roof Rafter Tape or Wire Tie Strap the vapor line to the joist or rafter at 8 ft intervals then strap the liquid line to the vapor line To hang l...

Page 9: ...e Metal Sleeve Anchored Heavy Nylon Wire Tie Automotive Muffler Type Hanger Wall Stud Wall Stud Liquid Line Vapor Line Wrapped in Armaflex Strap Liquid Line To Vapor Line Metal Sleeve Figure 10 Outsid...

Page 10: ...Engineering Handbook for approved TXV match ups and application information Check expansion valves equipped with Chatleff fittings are available from Lennox Refer to the Engineering Handbook for appli...

Page 11: ...ine valve Disconnect all power to the existing outdoor unit Re fer to gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system Disconn...

Page 12: ...se at up to 800 psi of pressure with a 4000 psi burst rating Service Valves Access the liquid line and vapor line service valves figures 13 and 14 and gauge ports are used for leak testing eva cuating...

Page 13: ...al injury WARNING Danger of explosion Can cause equipment damage injury or death When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system use a regu...

Page 14: ...set to 150 psig 1034 kPa and purge the hose Open the manifold gauge valves to break the vacuum in the line set and indoor unit Close the manifold gauge valves WARNING Danger of Equipment Damage Avoid...

Page 15: ...e 4 When the heating demand has been satisfied switch the thermostat to cooling mode with a set point of 68 F 20 C When pressures have stabilized use a digital thermometer to record the liquid line te...

Page 16: ...lations Significant differences could mean that the system is not properly charged or that a problem exists with some component in the system Pressures higher than those listed indicate that the syste...

Page 17: ...door Coil E t i Ai HPXA15 024 HPXA15 030 HPXA15 036 HPXA15 042 HPXA15 048 HPXA15 060 Entering Air Temp F C Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor 65 18 3 252 131...

Page 18: ...506 5 43 125 0 74 214 0 105 340 5 136 512 9 44 127 3 75 217 4 106 345 3 137 519 3 45 129 7 76 220 9 107 350 1 138 525 8 46 132 2 77 224 4 108 355 0 139 532 4 47 134 6 78 228 0 109 360 0 140 539 0 48...

Page 19: ...t control defrost relay time delay diagnostic LEDs and a terminal strip for field wiring connections See figure 17 The control provides automatic switching from normal heating operation to defrost mod...

Page 20: ...The service light thermostat provides a signal which activates the room ther mostat service light during periods of inefficient operation Diagnostic LEDs The defrost board uses two LEDs for diagnosti...

Page 21: ...re lubrication is needed 3 Adjust blower speed for cooling Measure the pressure drop over the coil to determine the correct blower CFM Refer to the unit information service manual for pressure drop ta...

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