Sterlco Royal Series Compact Temperature Control Unit - Manual (Page 21)

Royal Series Water Temperature Control Units Page 21
Water Out
Size Depends on Solenoid Used
The cooling water outlet leading back to the cooling tower, chiller,
or drain.
Net supply pressure must be between 25 psig and 55 psig (172.38
kPa/1.72 bars and 379.2 kPa/3.79 bars). Net supply below 15 psig
(103.43 kPa/1.03 bars) may allow water to flash to steam, cavitate
the impeller, and damage the pump, which prevents the unit from
cooling properly. Operation above 55 psig (379.2 kPa/3.79 bars)
may cause premature opening of the relief valve from pump
pressure and pressure surges.
PRESSURE RELIEF — ¾”
The pressure relief valve, located at the back of the unit, is pre-
piped to approximately four inches (4” or 10 cm) above the floor.
This piping reduces the chance of scalding nearby personnel if the
relief valve should trip.
3-9 Making System Purge Connections
Royal Series systems equipped with the System Purge option have
a compressed air inlet marked
MOLD PURGE . Connect to a clean,
dry 100 psig (689.50 kPa/6.90 bars) air line. Install your own
shutoff valve to prevent process liquid from backing up into the
plant air piping if the compressed air is turned off and the check
valve fails. Don’t depend on the solenoid valve to hold water
pressure in the temperature control unit.