CH1001-A Chiller Operator’s & Installation Manual
Publication Number: 620914301
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© 2002-2010, IMI Cornelius Inc.
Control Power Switch/Light
A lighted ON/OFF pushbutton switch, shown in Figure 3, is used to switch power to the 24VAC control circuit. The
switch illuminates to indicate that the chiller power is present.
Bypass Light (Blue)
A blue light, shown in Figure 3, is used to indicate when the system is operating at a reduced capacity. The light
cycles on and off in response to the temperature controller when the system temporarily requires less cooling.
Safety Light (Red)
A red light, shown in Figure 3, is used to indicate that a fault has occurred in the chiller operation. The following
conditions illuminate the safety light.
A. High refrigerant pressure.
B. Low process water temperature.
C. Low process water flow (optional, see Optional Equipment section)
High-Pressure Safety
The high-pressure safety, shown in Figure 3, shuts down the compressor and pump when the refrigerant head
pressure reaches 240-PSIG for R-134A refrigerant units. The high pressure switch must be reset manually. The
switch is located in the electrical box which must be accessed by removing the chiller lid. The high-pressure
switch can be re-set by depressing the reset button through the opening in the electrical box cover. If the control
opens again, check the setting with a set of refrigeration gauges. If the setting is correct, contact the Cornelius
Technical Service Department.
Low-Temperature Safety
The low-temperature safety shuts down the compressor and the pump when the process water temperature
drops below 35° F (1.7° C). The switch automatically resets when the water temperature is restored to 38° F (3.3°
C). The low temperature control is located in the electrical box.
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Process Water Flow, Units with Pumpt and Tank (Standard)
Follow standard plumbing practices and local codes in making water connections. The chiller inlet and outlet
connections are 3/4”. Flexible hose and fittings are recommended for plumbing the system. A No. 20 mesh
strainer should be installed on the chiller inlet to prevent foreign particles from entering the system and should be
cleaned monthly. Lines should be routed with as few bends as possible. Prevent lines from running near
radiators, hot water pipes, etc. Any lengths of tubing that are exposed to high ambient temperatures should be
insulated to prevent condensation and/or significant liquid heat loss.
After ensuring that the system is free from the obstruction, that all valves are open, and the reservoir when
available is full, push the Control Power switch to the “ON” position. The pump should now be operating.
All chillers with pumps and tank are supplied with a pressure regulating valve on the pump discharge. This valve
is preset at the factory to ensure that system pressure does not exceed the capabilities of the pump motor and/or
piping. If this valve requires adjustment, please contact the Cornelius Service Group for the proper setting
procedure and pressures.
WARNING: Never operate the chiller with it’s panels removed.
Always use the power switch to turn off the chiller when it is not being used (see Fluid
Recommendations page).
Always ensure that all air inlets and outlets are free from obstruction.
Be sure that the reservoir is filled with fluid prior to powering up the unit.