SterlingTEK A0551797 manual Verify proper rotation if

Problem	Possible Cause	Solution
		Verify proper rotation; if
	Pump is running in reverse.	incorrect, see Changing
		Rotation Direction on Page
		25 for more information.
Pump pressure is too low.		Clean the system. You may
		also have to pull the pump
	Check for foreign matter.	and inspect the impeller.
		Check for foam in the water
		circuit; add anti-foam if
		needed.
		Isolate evaporator, thaw out,
Process water pressure low,		check for leaks. Check
	Evaporator frozen.	coolant solution. Coolant
pressure at pump high.		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	Make sure that coolant
		mixture protection is right for
	solution.
Unit runs continuously, but		the process.
not enough cooling	Poor heat transfer in	Backflush and clean
power.	evaporator.	evaporator.
	Unit low on refrigerant.	Call service.
	Low water flow through	Increase flow to design flow
	evaporator.	of 2.4 gpm/ton.
	Inefficient compressor.	Call service.
	Unit under-sized for	Call sales representative.
	application.

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SSC Series Central Chilling Stations Page 79 of 86