194 Part Number 80-1230-9 10/10
3. Determine the temperature of the liquid line
entering the receiver by feeling it. This line is
normally warm; “body temperature.”
4. Using the information gathered, refer to the chart
below.
NOTE: A headmaster that will not bypass, will function
properly with condenser air temperatures of
approximately 70°F (21.1°C) or above. When the
temperature drops below 70°F (21.1°C), the
headmaster fails to bypass and the ice machine
malfunctions. Rinsing the condenser with cool water
during the freeze cycle will simulate lower ambient
conditions.
Freeze Cycle Headmaster Control Valve
Failure List
Symptom
Probable
Cause
Corrective Measure
Valve not maintaining
pressures
Non-approved
valve
Install a Manitowoc
Headmaster control
valve with proper setting
Discharge pressure
extremely high; Liquid
line entering receiver
feels hot
Valve stuck in
bypass
Replace valve
Discharge pressure
low; Liquid line
entering receiver feels
extremely cold
Valve not
bypassing
Replace valve
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