Table of Contents
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E2002 Lennox Industries Inc.
Dallas, Texas, USA
12HPB Outdoor Units
®
Lennox Merit
Series 12HPB outdoor units are approved
and warranted only for installation with specially
matched indoor coils, line sets, and refrigerant control
devices as designated by Lennox. Refer to Lennox engi-
neering handbook for expansion valve (TXV) kits which
must be ordered separately.
Shipping and Packing List
1 − Assembled 12HPB outdoor unit
Check unit for shipping damage. Consult last carrier imme-
diately if damage is found.
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.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent-
ing of refrigerant (CFC's and HCFC's) as of July 1,
1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incarcera-
tion may be levied for noncompliance.
06/04
*2P0604*
®
Page 1
INSTALLATION
INSTRUCTIONS
12HPB Series Units
HEAT PUMP UNITS
2 through 5 tons
504,532M
06/04
Supersedes 04/04
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RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
General Information
These instructions are intended as a general guide and do
not supersede national or local codes in any way. Authori-
ties having jurisdiction should be consulted before installa-
tion.
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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504,532M
*P504532M*
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Table of Contents
Related Manuals for Lennox 12HPB Series
Summary of Contents for Lennox 12HPB Series
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Page 1: Table Of Contents
RETAIN THESE INSTRUCTIONS matched indoor coils, line sets, and refrigerant control FOR FUTURE REFERENCE devices as designated by Lennox. Refer to Lennox engi- General Information neering handbook for expansion valve (TXV) kits which must be ordered separately. -
Page 2: Unit Dimensions
Unit Dimensions − inches (mm) 4-3/8 4-3/8 (111) (111) inlet 4-3/8 4-3/8 (111) (111) inlet inlet optional unit compressor stand-off kit (4) (field−installed) coil drain outlets (around perimeter of base) 6-3/8 4-3/8 (162) vapor line (111) connection inlet liquid line 6-3/8 4-3/8 connection... -
Page 3: Setting The Unit
3 − In heavy snow areas, do not locate the unit where drift- Setting the Unit ing will occur. The unit base should be elevated above the depth of average snows. CAUTION NOTE − Elevation of the unit may be accomplished by constructing a frame using suitable materials. -
Page 4: Electrical
If unit coil cannot be mounted away from prevailing winter WARNING winds, a wind barrier should be constructed. Size the barri- er at least the same height and width as outdoor unit. Mount Unit must be grounded in accordance with national barrier 24 inches (610 mm) from the sides of the unit in the and local codes. - Page 5 Typical Wiring Field Wiring Diagram * may be optional Figure 4 Outdoor Unit and Blower Unit 12HPB and Blower Unit Thermostat Designations Thermostat Designations (with emergency heat) (Some connections may not apply. (Some connections may not apply. Refer to specific thermostat and indoor unit.) Refer to specific thermostat and indoor unit.) Outdoor Outdoor...
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Page 6: Refrigerant Piping
During the installation of any heat pump or a/c system, it is (flare or sweat connections). important to properly isolate the refrigerant lines to prevent Use Lennox L15 (sweat, non-flare) series line sets as unnecessary vibration. Line set contact with the structure shown in table 1 or use field-fabricated refrigerant lines. - Page 7 Installing Vertical Runs of Refrigerant Piping (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...
- Page 8 Installing Horizontal Runs of Refrigerant Piping 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 Transitioning From Vertical To Horizontal Runs of Refrigerant Piping 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...
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Page 10: Refrigerant Metering Device
Refrigerant Metering Device liquid line 12HPB units are used in check expansion valve systems stub only. See the Lennox Engineering Handbook for approved TXV match-ups and application information. Check expansion valves equipped with Chatleff fittings Figure 11 are available from Lennox. Refer to the Engineering... -
Page 11: Service Valves
12HPB Manifold Gauge Connections (Cooling Cycle) Outdoor Uni defrost thermostat distributor reversing valve expansion/ check valve biflow filter / drier outdoor coil high Indoor Uni pressure pressure muffler GAUGE MANIFOLD vapor vapor service line port valve liquid line HCFC−22 compressor service drum port... -
Page 12: Leak Testing
Service Valve WARNING (Valve Closed) stem cap Danger of fire. Bleeding the refrigerant service charge from only the high side may re- port sult in the low side shell and suction tubing being pressurized. Appplication insert hex of a brazing torch while pressurized wrench here to outdoor coil may result in ignition of the refrigerant... -
Page 13: Evacuation
7 − After a few minutes, open a refrigerant port to ensure CAUTION 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 HCFC-22 Avoid deep vacuum operation. -
Page 14: Charging
have consulted the power company and the voltage 1 − Recover the refrigerant from the unit. condition has been corrected. 2 − Conduct a leak check, then evacuate as previously outlined. 6 − Set the thermostat for a cooling demand. Turn on pow- er to the indoor blower and close the outdoor unit dis- 3 −... - Page 15 Charging Using Normal Operating Pressures Approach Method 4 − Use the same digital thermometer used to check out- and the Approach Method door ambient temperature to check liquid line tempera- Outdoor Temp. > 65_F (18_C) ture. Verify the unit charge using the approach method. The following procedure is intended as a general guide and 5 −...
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Page 16: System Operation
control circuit is isolated from power and field-provided re- IMPORTANT lays bypass the outdoor thermostats. An amber indicating light simultaneously comes on to remind the homeowner Use table 7 as a general guide when performing that he is operating in the emergency heat mode. maintenance checks. - Page 17 12HPB Defrost Control Board High Pressure Switch Safety Circuit Connections defrost NOTE − To add pressure interval switch, remove factory− timing pins installed jumper connection for optional high pressure diagnostic switch LEDs high terminal strip pressure switch Figure 16 Defrost Control Timing Pins Pressure Switch Circuit Each timing pin selection provides a different accumu- The defrost control incorporates a pressure switch circuit...
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Page 18: Maintenance
Indoor Unit 1 − Clean or change filters. Electric shock hazard. Can cause injury 2 - Lennox blower motors are prelubricated and permanent- or death. Before attempting to perform ly sealed. No more lubrication is needed. any service or maintenance, turn the 3 −...
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