Welbilt Koolaire KD0270A, Technician'S Handbook, Page: 123 / 136

Part Number STH047 Rev01 10/18 123
Cycle Times, 24 Hr. Ice Production and
Refrigerant Pressure Charts
These charts are used as guidelines to verify correct ice
machine operation.
Accurate collection of data is essential to obtain the
correct diagnosis.
• Refer to “Operational Analysis Chart” for the list
of data that must be collected for refrigeration
diagnostics. This list includes: before beginning service,
ice production check, installation/visual inspection,
water system checklist, ice formation pattern,
safety limits, comparing evaporator inlet/outlet
temperatures, harvest valve analysis, discharge and
suction pressure analysis.
• Ice production checks that are within 10% of the chart
are considered normal. This is due to variances in
water and air temperature. Actual temperatures will
seldom match the chart exactly.
• Zero out manifold gauge set before obtaining pressure
readings to avoid misdiagnosis.
• Discharge and suction pressure are highest at the
beginning of the cycle. Suction pressure will drop
throughout the cycle. Verify the pressures are within
the range indicated.
• Production and cycle times are for dice cube - Half dice
cube cycle times can be 2 - 3 minutes faster, depending
on model and ambient temperature.
Charts