Water Valve Adjustment - OCEANAIRE OWC QC Series Engineering, Installation And Service Manual

WATER VALVE ADJUSTMENT

Each OCEANAIRE WATER-COOLED unit is equipped with an automatic water
regulating valve to control the condenser water flow rate. The water valve will open
when the unit is in the cooling mode and adjust the gallon per minute flow rate
based on the entering water temperature (EWT).
The water valve operates independently from the water system, and regulates flow
based on the systems refrigerant head pressure.
Under certain conditions, entering water temperatures can cause the valve to
rapidly open and close, causing a "harmonic" pitch in the water supply line. In these
cases, it is recommended that the water valve be adjusted.
1. Disconnect the unit power.
2. Remove water valve cover plate or back panel (depending on model) to locate the
water valve.
The opening point pressure (also called the crack-open point) is the refrigeration
pressure (at the valve sensing element) necessary to just lift the valve disc off
the valve seat, allowing water to flow through the valve body.
3. At the top of the valve, there is a square shaped adjustment screw. Using a
standard service wrench or flat blade screwdriver, adjust the valve using quarter
turns, allowing the unit to operate 5 minutes after each new setting:
•
Turn the range adjustment screw CCW (closing the valve), which raises the high
side pressure and raises the valve set point to open
•
Turn the range adjustment screw CW (opening the valve), which lowers the high
side pressure and lowers the valve set point to open
4. Re-install valve cover plate or back panel when finished.
Regarding a field replacement water valve, the best practice is to close the valve,
then turn the range adjustment screw (CW) to slowly open the valve, half-turns,
to dial in the units exiting water temp between 100-105*F
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