Fan Cycling Switch — This switch control fan operation. The fan turns ON when the discharge pressure of the
refrigerant exceeds 400 psi (27.8 bar) and remains running until the pressure falls below 300 psi (20.7 bar).
NOTE: 10 HP Chillers have two fans. One fan turns ON with the compressor and runs continuously as long
as the compressor is ON; operation of the second fan is based on refrigerant pressure as described above.
Reservoir Float Switch (Optional) — Measures liquid level in the Chiller’s reservoir. If the fluid level drops too
low, power to the pump, compressor, and fan is removed and an alarm message displayed on the Control
Panel’s LED readout.
Fluid Circulation System
This sub-system governs fluid flow through the Chiller.
Evaporator — Serves as the heat exchanger between the refrigeration and fluid flow systems. Cools fluid
before it returns to process.
Reservoir Tank — This polyethylene tank is used to maintain stable temperature control and an adequate
reservoir of fluid for the system. It may be equipped with an optional float switch that monitors fluid level and
activates an alarm. A stainless steel reservoir is available as an option.
Sight Glass or Level Indicator — This indicator serves as a convenient means of checking the liquid level
within the Reservoir Tank. The sight glass is located on the rear panel.
Pump — Used to pump fluid from the Reservoir Tank to the process and back to the Chiller. A variety of pumps
are available for operation at different pressures, flow rates, and distances from the Chiller to the process.
Full Flow Bypass — Allows the maximum operating pressure to be regulated and protects the Pump in the
event that process piping becomes restricted or clogged. Diverts flow from the process line back to the
Evaporator and Reservoir.
Y-Strainer — Located on the inlet to the Chiller. Incorporates a cleanable 20 mesh (841 micron) stainless steel
screen to remove large particulate matter from the process fluid.
External Bypass / Shutoff Valves — Allows the unit to be operated independent of the process during the
servicing of process equipment and/or process lines. Can also be used to fine-tune process pressure and flow
rate.
Process Side-Stream Filter System (Optional) — Consists of a 50 micro filter and ball valve connected
between the Chiller inlet and outlet. It is used to filter particulate matter from a portion of the process fluid flow.
Cooling System
NOTE: The Condenser on DuraChill Chillers is either air-cooled or water-cooled.
Common Cooling System Components
The following components are common to both air-cooled (DA models) and water-cooled (DW models)
DuraChill Chillers:
Evaporator — Serves as the heat exchanger between the refrigeration and fluid flow systems. Removes heat
from the process fluid before it is returned to the process equipment.
Compressor — The Chiller incorporates a 5 to 10 HP Copeland Scroll compressor. The Compressor is
protected from overloads through high and low pressure cutouts.
Filter Dryer
— Removes residual particulate matter and moisture from the refrigeration system. The Filter Dryer
must be replaced whenever the sealed refrigeration lines are opened for service.
Sight Glass — Used to observe refrigerant fluid flow to the Evaporator.
Thermostatic Expansion Valve (TXV) — Controls refrigerant superheat at the outlet of the Evaporator to
prevent liquid from returning to the Compressor.
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