R-Pro › Field cases › Ice machines
Abnormally Long Ice-Making Cycle
Likely causes
Reduced cooling capacity due to refrigerant shortage
Check: Measure R-404A suction pressure — below 0.37 MPa (@-15°C saturation) = shortage; normal cycle 12~18 min, above 25 min = abnormal
What to do: Repair leak → vacuum 30 min → recharge to spec; recheck suction pressure after charging
High condensing temperature (elevated head pressure)
Check: Measure discharge pressure — R-404A @40°C condensing normal ~1.6 MPa; above 2.0 MPa = condensing problem
What to do: Clean condenser fins; ensure ventilation clearance; verify fan operation
Expansion valve under-feeding
Check: Evaporator inlet-outlet temperature difference — below 5°C = insufficient refrigerant flow; if suction pressure also low, EEV under-feeding
What to do: Screw type: adjust superheat to 4~6°C; EEV: check parameters then replace
High inlet water temperature
Check: Measure incoming water temperature — 10~20°C normal; above 25°C inevitably extends freeze cycle
What to do: Insulate supply line or schedule supply during cooler hours; re-negotiate required output with customer
Thickness sensor set value too high
Check: Thickness sensor setting — harvest doesn't start until set thickness reached; compare set vs actual ice thickness with calipers
What to do: Adjust set thickness to reference value (typically 5~7mm); excessive setting reduces production
Freeze cycle over 25 min → always measure high and low pressure simultaneously; R-404A reference: suction 0.37 MPa, discharge 1.6 MPa at normal operating temp
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
Open R-Pro →