Temperature Control Units : MFC with G Series Instrument
Page: 47
Milacron Process Support Business
4165 Halfacre Road Batavia, Ohio 45103
Phone: 513-536-2584
www.milacron.com
by reading the unit’s 0-160 PSI pressure gauges when the unit’s motor pump
is off. If the water supply pressure at the unit’s location exceeds 75 PSI, a
pressure reducing valve must be installed in the water supply line. The factory
recommended ‘regulated pressure out’ is 55 PSI. Refer to section 7.3 for
regulator installation drawing.
2. Back ow prevention device in water supply line. If a back ow 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. Refer to section 7.3 for regulator installation
drawing.
3. Valve contamination. The pressure relief valve may become contaminated with
water debris causing the valve not to close properly. If this is the case, ushing
the valve for a moment will cleanse the seat and allow it to work properly. If
ushing the valve does not remedy the leaking, the valve must be replaced.
4. Extreme internal system pressure. If the internal pressure in the unit is
elevated, the pressure relief valve will leak as a safety measure to dissipate
excessive pressure. If this is the case, the operator must determine why the
system internal pressure is excessive and correct the condition.
4.7 COOLING VALVE FAULT
A. AVT
TM
FAULT. When power is applied, the AVT
TM
valve begins a ‘homing process’. The
valve is turned forward and backward across a limit switch to establish the valve position.
B. If valve position cannot be established, a fault will be displayed.
Refer to section 5.3 for AVT
TM
service and repair instructions.
AVT Valve Fault Screen.
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