Table of Contents
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©2021 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT
FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, or service agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
INSTALLATION
INSTRUCTIONS
LRP14G(E/X) / LRP14AC / LRP14HP
UNITS
RESIDENTIAL PACKAGED UNITS
Gas/Electric - Air Conditioner - Heat Pump
508201-01
6/2021
Table of Contents
Unit Dimensions ..........................................................2
Roof Curb Dimensions ................................................4
Adjustable Roof Curb Dimensions...............................6
Installation ...................................................................7
Venting.........................................................................9
Duct System ..............................................................10
Filters .........................................................................10
Condensate Drain......................................................11
Gas Piping .................................................................11
Electrical Wiring ........................................................12
Heating Start-Up .......................................................13
Operation - Gas / Electric Units ................................15
Maintenance - Gas / Electric Units ...........................16
Wiring Diagram - LRP14GE......................................18
LRP14AC / LRP14HP ................................................19
Condensate Drain......................................................19
Sequence of Operation..............................................19
Maintenance - LRP14AC/LRP14HP .........................22
Wiring Diagrams - LRP14AC / LRP14HP .................24
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
Page 1
CAUTION
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Summary of Contents for Lennox LRP14G
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS ©2021 Lennox Industries Inc. LRP14G(E/X) / LRP14AC / LRP14HP Dallas, Texas, USA UNITS RESIDENTIAL PACKAGED UNITS Gas/Electric – Air Conditioner – Heat Pump 508201-01 6/2021 Table of Contents Unit Dimensions ............2 Roof Curb Dimensions ..........4 Adjustable Roof Curb Dimensions.......6 Installation ..............7... -
Page 2: Unit Dimensions
Unit Dimensions - Small Base Gas/Electric 47.66 2.48 1.98 2.33 2.33 16.77 14.02 RETURN SUPPLY 18.52 11.49 11.49 16.07 TOP VIEW 47.66 POWER ENTRY GAS ENTRY 6.94 3.25 4.56 20.31 21.06 23.19 SIDE VIEWS CONDENSATE DRAIN 3/4 NPT 5.75 3.55 40.89 21.63 4.12... - Page 3 Unit Dimensions - Large Base Gas/Electric 56.13 2.11 2.39 2.33 2.33 19.49 19.49 RETURN SUPPLY 18.52 11.49 11.49 TOP VIEW 16.07 47.66 POWER ENTRY GAS ENTRY 6.94 3.25 10.06 25.81 26.56 28.68 SIDE VIEWS CONDENSATE DRAIN 3/4 NPT 5.75 3.55 44.89 21.63 4.12...
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Page 4: Roof Curb Dimensions
Roof Curb Dimensions - Small Base Gas/Electric 3/4 (19) RETURN Opening for Power Entry OPENING Through Unit Base 5-1/2 x 5-5/8 in. (140 x 31 mm) 16-7/8 44-3/8 (429) (1127) 11-1/2 2-1/8 (287) (54) Insulated Panels 5-3/4 13-7/8 (146) (352) SUPPLY 5-1/2 OPENING... - Page 5 Roof Curb Dimensions - Large Base Gas/Electric 3/4 (19) Opening for Power Entry Through Unit Base 5-1/2 x 5-5/8 in. 19-1/2 (140 x 31 mm) 44-3/8 (380) 11-1/2 2-1/8 (1127) (287) (54) RETURN Insulated OPENING Panels 19-1/2 (380) SUPPLY OPENING 11-1/2 (287) 8 (203)
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Page 6: Adjustable Roof Curb Dimensions
Adjustable Roof Curb Dimensions ADJUSTABLE PITCH ROOF CURB FRONT FLANGE 8 (203) NOTE: UNIT BASE RAIL Minimum CLIPS (4) Height 4 (102) BUILT-IN RAIN SIDES AND DIVERTER BACK FLANGE (Not Shown) 6 (152) BUILT-IN DRIP EDGE UNIT BASE RAIL 3/4 (76) UNIT BASE RAIL CLIPS (4) (152) -
Page 7: Installation
Installation Unit is designed for outdoor installation only. Unit must be installed so all electrical components are protected These instructions must be saved for future reference. from water. These units are single package air conditioners with gas Condenser coils must have an unlimited supply of air. heat designed for outdoor installation on a rooftop or a For ground level installation, use a level prefabricated slab. - Page 8 • Return air temperature range between 55°F (13°C) Clearance to Clearance for and 80°F (27°C) must be maintained. Combustibles Service Access • Air filters must be replaced and pre-filters must be Front of unit 0 in. 24 in. removed upon construction completion. Back of unit 0 in.
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Page 9: Venting
Venting All panels must be in place for rigging. Place field-provided spreaders in place. Spreaders The vent outlet must be installed in a location as to prevent must be of adequate strength and length (must exceed building degradation and must be consistent with the unit dimension by 6 inches). -
Page 10: Duct System
Duct System NOTE: The duct system should be designed and sized according to the methods in the Air Conditioning Contractors of If an existing gas furnace is being removed from a America (ACCA) manual that is most appropriate to the common venting system when this packaged unit is installation application. -
Page 11: Condensate Drain
To prime trap, pour several quarts of water into drain, Unit Model Filter 1 Filter 2 enough to fill drain trap and line. 24, 30, 36 14 x 20 x 1 20 x 20 x 1 42, 48, 60 20 x 20 x 1 CAUTION Table 2. -
Page 12: Electrical Wiring
NOTE: An optional bottom-entry gas kit is available for Carefully rinse piping thoroughly after completing leak detection. these units. See the kit instructions for proper installation details. NOTE: An optional bottom-entry gas kit is available for these units. See the kit instructions for proper installation details. -
Page 13: Heating Start-Up
Four wires are required for cooling. The heat anticipator FIELD-SUPPLIED FUSED setting is 0.75 amp. OR CIRCUIT BREAKER CONTACTOR GROUND DISCONNECT Compressor Units are shipped with compressor mountings factory- adjusted and ready for operation. CAUTION Do not loosen compressor mounting bolts. If 208 Volt is supplied, transformer connection must be changed Figure 5. - Page 14 To Shut Down Main Burners Manifold Gas Pressure Adjustment Regulator – LP/ Propane Gas Turn off electrical power to unit. LP/propane units require a LPG regulator on both the gas Slide the gas valve switch to the “OFF” position (see valve and on the LP/propane tank.
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Page 15: Operation - Gas / Electric Units
To change orifice: A combustion air inducer operates for the first 10 seconds of every cooling cycle to prevent insects from nesting in Remove screws that fasten the manifold to the the flue outlet. burner box assembly and remove the manifold. Remove the orifices, then install replacement Blower Delay –... -
Page 16: Maintenance - Gas / Electric Units
Heating Sequence of Operation Flame Sensor When the thermostat calls for heating, R is closed to W. The If the ignition control does not receive a signal from the following describes the gas heating sequence of operation. flame sensor indicating that the burners have established flame, the gas valve closes after the 10-second trial for A call for heat from the room thermostat starts the ignition period. - Page 17 Condenser coil may need to be cleaned at startup in clean the wheel and housing. Run the wire brush down case oil from the manufacturing process is found on the the flue extension at the outlet of the vent housing. condenser coil.
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Page 18: Wiring Diagram - Lrp14Ge
Wiring Diagram – LRP14GE Figure 8. Wiring Diagram – Single Phase CT Page 18... -
Page 19: Lrp14Ac / Lrp14Hp
LRP14AC / LRP14HP Condensate Drain Crankcase Heater (if used) Some models may be equipped with a crankcase heater This package unit is equipped with a 3/4” FPT coupling to prevent excessive migration of liquid refrigerant into the for condensate line connection. Plumbing must conform compressor during off cycles. - Page 20 heater sequencers as well as the indoor blower. Upon satisfying auxiliary heat demand, the thermostat opens DEFROST TIMING above circuits and heating elements sequence off; blower PINS (P1) continues to operate until all heating elements have turned TEST off. PINS DIAGNOSTIC LEDS Defrost System...
- Page 21 Pressure Switch Circuit At the end of the defrost cycle, when the unit goes back to heating mode, the low pressure switch is High and low pressure switches are connected to the checked to see if it has reset. If so, the strikeout is not defrost control board on heat pump models.
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Page 22: Maintenance - Lrp14Ac/Lrp14Hp
System Performance Model Liquid Subcooling +/- 2° This equipment is a self-contained, factory optimized refrigerant system, and should not require adjustments to 2 Ton system charge when properly installed. If unit performance 2.5 Ton is questioned, perform the following checks. 3 Ton Ensure unit is installed per manufacturer’s instructions 3.5 Ton... - Page 23 Condenser Coil Condenser coil may need to be cleaned at startup in case oil from the manufacturing process is found on the Clean condenser coil annually with water and inspect condenser coil. monthly during the cooling season. Table 10. Cooling Performance - AC Units 80 DB / 67 WB Deg.
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Page 24: Wiring Diagrams - Lrp14Ac / Lrp14Hp
Wiring Diagrams – LRP14AC / LRP14HP Figure 12. Connections Diagram - A/C Constant Torque Page 24... - Page 25 J1-2 J1-1 J1-3 208V 240V Figure 13. Connections Diagram - Heat Pump Constant Torque Page 25...
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