Manitowoc STH042 4/16, Technician'S Handbook

Page: 68 / 146

68 Part Number STH042 4/16
Water System Checklist
A water-related problem often causes the same
symptoms as a refrigeration system component
malfunction.
Example: A water dump valve leaking during the freeze
cycle, a system low on charge, and a starving TXV have
similar symptoms.
Water system problems must be identified and
eliminated prior to replacing refrigeration components.
Water area (evaporator) is dirty
• Clean as needed
Water inlet pressure not between 20 and 80 psig
(1–5 bar, 138–552 kPa)
• Install a water regulator valve or increase the water
pressure
Incoming water temperature is not between 40°F (3°C)
and 90°F (32°C)
• If too hot, check the hot water line check valves in
other store equipment
Water filtration is plugged (if used)
• Install a new water filter
Vent tube is not installed on water outlet drain
• See Installation Instructions
Hoses, fittings, etc., are leaking water
• Repair/replace as needed
Water valve is stuck open, closed or is leaking
• Clean/replace as needed
Water is spraying out of the sump trough area
• Stop the water spray
Uneven water flow across the evaporator
• Clean the ice machine
Water is freezing behind the evaporator
• Correct the water flow
Plastic extrusions and gaskets are not secured to the
evaporator
• Remount/replace as needed