Hot Gas Bypass Solenoid Valve — Injects refrigerant vapor into the Evaporator to help maintain a constant
temperature when the temperature of the process fluid falls below the temperature set point. Under low- and no-
load conditions, temperature continues to fall until it reaches the “Lb” lower band and shuts the Compressor
OFF.
Refrigerant Safety Relief Valve — This is an automatic safety used to vent refrigeration gas if it exceeds 650
psi (44.8 bar).
Air-Cooled Chillers (DA Models)
The following components are specific to air-cooled DuraChill Chillers:
Condenser — The Compressor pumps vapor into the Condenser at high pressure. As the surrounding air is
cooler than the hot vapor, heat energy passes into the air from the condenser coils.
Condensing Fan — a 1 HP fan (two fans on 10 HP units) that draws air over the condenser coils to cool
refrigerant gas. The standard fan cycles ON and OFF based on refrigerant pressure (ON at 400 psi / 27.6 bar;
OFF at 300 psi / 20.7 bar). The second fan on 10 HP units runs whenever the Compressor is ON.
Water-Cooled Chillers (DW Models)
Brazed-Plate Heat Exchanger / Condenser — Serves as the heat exchanger between the refrigeration system
and the facility water supplied by the customer. Removes heat from the refrigerant.
Condensing Water Regulating Valve — This valve regulates the facility water flow to maintain optimal
discharge pressure (approximately 250 psi / 17.2 bar) for the heat exchange in the Condenser. It increases flow
to decrease pressure and decreases flow to increase pressure.
Receiver — The main purpose of the Receiver is to temporarily store refrigerant (in its liquid state) that is not
required when load conditions are low. The Receiver also provides a constant supply of liquid to the
Thermostatic Expansion Valve (TXV).
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