Greenheck Fan Energy Recovery Ventilator with Heat Pump 473501 - Manual (Page 26)

26 Model ERCH-HP Energy Recovery Unit
Refrigeration System Schematic
Typical Operating Conditions
Location Refrigerant State Temperature Pressure Superheat/Subcool
Cooling
Mode /
Refrigerant
Properties
Before water-to-refrigerant
heat exchanger
Hot Vapor 150°F 330 PSIG 50°F Superheat
After water-to-refrigerant
heat exchanger
Warm Liquid 85°F 330 PSIG 15°F Subcool
After Thermostatic
Expansion Valve
Saturated Liquid-
Vapor mix
-45°F 144 PSIG
After Airside Coil Cold Vapor 55°F 145 PSIG 10°F Superheat
Water entering the coaxial heat exchanger is warmed by the heat it absorbs from the refrigerant and leaves about
10°F warmer.
Location Refrigerant State Temperature Pressure Superheat/Subcool
Heating
Mode /
Refrigerant
Properties
Before Airside Coil Hot Vapor 130°F 250 PSIG 50°F Superheat
After Airside Coil Warm Liquid 65°F 250 PSIG 15°F Subcool
After Thermostatic
Expansion Valve
Saturated Liquid-
Vapor mix
-35°F 120 PSIG
After water-to-refrigerant
heat exchanger
Cold Vapor 45°F 120 PSIG 10°F Superheat
Water entering the coaxial heat exchanger is cooled because of the heat being absorbed by the refrigerant and
leaves about 6 °F warmer.