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4. Check the pressure switch to ensure it is properly set for the
intended operating temperature. The pressure switch is
factory set for 15 PSI (1.05 Bar) and the unit will not start
unless the cooling water pressure is 15 PSI (1.05 Bar) or
greater. For set point temperatures above 200°F (93°C) the
pressure switch should be set for a minimum of 25 PSI
(1.75 Bar).
5. Make sure that the supply chilled water source is the
appropriate temperature and pressure for your application
as determined when the unit was selected. In most cases,
the cooling water temperature is between 40°F (4.4°C) and
85°F (29.4°C). The cooling water source pressure must be
above the set point of the pressure switch in order for the
unit to start. For most applications the design cooling water
pressure is between 25 PSI (1.75 Bar) and 50 PSI (3.5 Bar).
If the supply cooling water pressure is higher than 50 PSI
(3.5 Bar), a pressure-regulating valve should be installed on
the supply line to the temperature control unit. For
assistance in installing a pressure-regulating valve please
contact our Tech Service Department.
6. Turn on the control power by pressing the Power button
located on the control panel of the unit. The digital displays
should now be illuminated. Press the Start button. The unit
will initiate an Auto Vent sequence. This sequence opens
the cooling solenoid for 30 seconds to vent air from the
system. After 30 seconds the cooling solenoid will remain
open and the pump will be energized for an additional 30
seconds. This should clear all of the air out of the system.
7. Check the rotation of the pump. If the pump is running
backwards, switch two of the main power leads, after
shutting off the disconnect switch.
8. The set point temperature should now be entered. Refer to
the Control Panel Operation section for further information.
The unit is now ready to be placed into service.
