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Page 70 of 77 SCW Series Central Chilling Stations
Problem Possible Cause Solution
Pump is running in reverse.
Verify proper rotation; if
incorrect, see Changing
Rotation Direction on Page
25 for more information.
Pump pressure is too low.
Check for foreign matter.
Clean the system. You may
also have to pull the pump
and inspect the impeller.
Check for foam in the water
circuit; add anti-foam if
needed.
Process water pressure low,
pressure at pump high.
Evaporator frozen.
Isolate evaporator, thaw out,
check for leaks. Check
coolant solution. Coolant
solution should be good for at
least 10ºF (6ºC) below
leaving water temperature.
Restricted condenser air flow.
Clean air filters, clean
condenser, check water flow.
Refrigerant not feeding.
Check superheat on
expansion valve.
Improper water/glycol
solution.
Make sure that coolant
mixture protection is right for
the process.
Poor heat transfer in
evaporator.
Backflush and clean
evaporator.
Unit low on refrigerant. Call service.
Low water flow through
evaporator.
Increase flow to design flow
of 2.4 gpm/ton.
Inefficient compressor. Call service.
Unit runs continuously, but
not enough cooling
power.
Unit under-sized for
application.
Call sales representative.
.