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Pressure Relief ValvePressure Relief Valve
Pressure Relief ValvePressure Relief Valve
Pressure Relief Valve
(PD and TU Pumps Only)(PD and TU Pumps Only)
(PD and TU Pumps Only)(PD and TU Pumps Only)
(PD and TU Pumps Only)
Units with a PD-1, PD-2, or any TU type pump have an adjustable pressure
relief valve. Refer to the pump identification label on the rear of the controller
to identify the specific pump in your unit.
The pressure relief valve establishes the maximum operating pressure of the
unit. If the pressure of the fluid leaving the pump exceeds the valve setting,
the relief valve will bypass the fluid within the unit to relieve the pressure.
The valve does not determine the actual operating pressure; the operating
pressure of the system is determined by the back pressure of the connected
equipment and the setting of the flow control valve. If adjustment seems
necessary, consult our Service Department for assistance.
Before calling, refer to the serial number label on the rear of the case top to
obtain the following:
- unit part number
- unit serial number
High Pressure CutoutHigh Pressure Cutout
High Pressure CutoutHigh Pressure Cutout
High Pressure Cutout
(Water-Cooled Units Only) (Water-Cooled Units Only)
(Water-Cooled Units Only) (Water-Cooled Units Only)
(Water-Cooled Units Only)
Should the unit's refrigeration discharge pressure become too high the high
pressure cutout will activate and shut down the unit. High pressures can be
caused by a lack of cooling water to the compressor or debris in the
refrigeration lines.
Once the cause of the problem has been identified and corrected you must
manually reset the cutout. The cutout location depends on the size of your
unit. On the HX-75, it is behind the right side panel, on the HX-100 and
HX-150 it is behind the left side panel, and on the HX-200 through HX-750 it
is behind the rear panel.
Locate the white reset switch on the high pressure cutout. Press in on the
switch until a "click" is heard. If the reset does not "click" the cutout was not
activated and the unit shut down occurred for another reason.
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