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12HPB Series LennoxHeat Pump Unit
Lennox 12HPB Merit Series Heat Pump
Name of Series: Merit
Service Manual: Click Here
Parts List: Click Here
The Lennox 12HPB was a high-efficiency residential split system
heat pump unit in its time. It was available in
1.5, 2, 2.5, 3, 3.5, 4,
and 5 ton capacities.
Considered a high SEER unit in its day, the 12HPB Merit Series could
approximately 10 SEER. The minimum SEER allowed for installation today
due to energy consumption is 13 SEER. Models are available up to 21
All 12HPB sizes are equipped with crank case heaters which ensure the
refrigerant and oil in the compressor stay seperate during cool periods
of no operation.
All 12HPB sizes are required to be matched with a Thermal Expansion
Valve on an indoor coil of proper size.
DO NOT USE AN AIR
CONDITIONER COVER ON THIS UNIT AS IT IS DESIGNED TO RUN ALL
The main components(repair parts) for all 12HP Series units
- Main Contactor: Energizes the compressor and fan on
a call for cooling
- Dual Capacitor: Creates a phase shift to start and
run both the compressor and contactor
- Fan Motor and Blade: Circulates air through the
condensing coils removing and expelling heat collected
- Reciprocating compressor: Circulates the refrigerant
through the system changing the refrigerants state to facilitate heat
- Reversing Valve: enables the unit to operate in a
reverse cooling cycle. This is the component that makes the unit a heat
- Timer and Defrost Control: Ensures the unit
cycled or started and stopped before pressure equalization occurs and
sets unit into defrost when required by either time or temperature.
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