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91961OPR
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WATER FLOW START-UP
Chiller with Pump
It is important to check the pump rotation on the three phase units. Remove the lower side panel to expose the
pump. Turn the pump power switch to the “ON” position for a few seconds. Observe the motor shaft to ensure
that it is turning in the direction indicated by the arrow located on the pump housing. If the rotation is incorrect,
reverse two of the three incoming power supply leads at the terminal strip. After changing the leads, check the
pump rotation.
NOTE: Running the pump in reverse for more than a few seconds will result in permanent
pump damage.
After ensuring that the system piping is free from obstruction and that all valves are open, turn the pump power
switch to the “ON” position. The pump power indicator should illuminate, indicating that the pump is operating.
All Chillers with pumps are provided with a pressure regulating valve on the pump discharge. This valve is pre-
set at the factory to ensure that system pressure does not exceed the capabilities of the pump motor and/or pip-
ing. If this valve requires adjustment, please contact the factory for proper setting procedure and pressures.
A flow meter and throttling valve can be added in the chiller inlet line in order to monitor and/or adjust the flow
rate through the Chiller.
Once the flow has been established, the thermostat can be adjusted to the desired set-point.
Chiller without Pump
A flow meter and throttling valve can be added in the Chiller inlet line in order to monitor and/or adjust the flow
rate through the Chiller.
Once the flow has been established, the thermostat can be adjusted to the desired set-point. See thermostat
adjustment.
THERMOSTAT ADJUSTMENT
Standard Thermostat
The following procedure should be followed to adjust the standard thermostat:
1. To set the “SET POINT”, press and release the “SET” button, the current “SET POINT” will be displayed.
2. While the current “SET POINT” is displayed, press the “UP” or “DOWN” button to change the “SET POINT”
to desired temperature.
3. Release all buttons. The display will show the system water temperature after a few seconds. The “SET
POINT” can be viewed at any time by pushing the “SET” button.
The thermostat has a range that has been preset at the factory. The range is 40_F (5_C) to 100_F (38_C). If
operation outside of this range is required, please contact the Technical Service Department.
UP
DOWN
SET