icetro IM Series, Technician'S Handbook

Page: 121 / 166

NOTE: A headmaster valve that will not bypass, will
function properly with condenser air temperatures of
approximately 70°F (21°C) or above. When the
temperature drops below 70°F (21°C), the head
pressure control valve fails to bypass and the ice
machine malfunctions. Lower ambient conditions can
be simulated by rinsing the condenser with cool water
during the freeze cycle.
Condition Probable Cause
Corrective
Measure
Discharge Pressure -
High Liquid Line
Temperature - Hot
Valve stuck in
bypass
Replace valve
Discharge Pressure -
Low Liquid Line
Temperature - Cold
Valve not
bypassing
Replace valve
Discharge Pressure -
Low Liquid Line
Temperature - Hot
Ice Machine Low
on Charge
Refrigerant
Charge
Verification
120