Specifications

IM 1060-3 / Page 29 of 32
Typical Heating Refrigeration Cycle – Dual
Compressors
Note: Typical temperature readings are at full load
conditions at ISO-13256 for boiler-tower applications.
When the wall thermostat calls for HEATING, the reversing
valve(energized)directstheowoftherefrigerant,ahotgas,
from the compressor to the air-to-refrigerant heat exchanger
coil (condenser). There, the heat is removed by the air passing
over the surfaces of the coil and the hot gas condenses and
becomesaliquid.Theliquidthenowsthroughathermal
expansion valve to the water-to-refrigerant heat exchanger
(evaporator). The liquid then evaporates and becomes a
gas, at the same time absorbing heat and cooling the water.
Therefrigerantthenowsasalowpressuregasthroughthe
reversing valve and back to the suction side of the compressor
to complete the cycle.
Figure 34: Heating Refrigeration Cycle