Temptek G-500 Series, Instruction Manual

Page: 39 / 64

Temperature Control Unit : VTO Series with G500 Series Instrument
Page: 39
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
4.6 WATER PRESSURE RELIEF VALVE LEAKS
A. The unit has a 150 psi pressure relief valve mounted in the water circuit. If the valve is
found to be leaking, the operator should check the following:
1. Back flow prevention device in water supply line. If a back flow prevention
device (check valve, pressure regulator, closed valve) is installed in the water
supply line, increased pressures from thermal expansion are unable to move into
the water supply line. This will increase the unit’s internal pressure causing the
pressure relief valve to leak.
2. Valve contamination. The pressure relief valve may become contaminated with
water debris causing the valve not to close properly. If this is the case, flushing
the valve for a moment will cleanse the seat and allow it to work properly. If
flushing the valve does not remedy the leaking, the valve must be replaced.