Sterling A0554831 manual Indicator Name Description

Indicator	Name	Description
	Low Water	The Low Water Flow/Pressure light comes on when
	Flow/Pressure	the flow switch (pressure switch on 2 & 3 hp
	Light	models) senses that the water/glycol flow rate
		through the evaporator has dropped below an
		acceptable level. The flow switch opens shutting
		down the pump(s) and the chiller.
	Low Refrigerant	The Low Refrigerant Pressure light come on if the
	Pressure Light	compressor suction pressure drops below the limit
		of the low pressure cutout switch. The compressor
		shuts off, but the pump(s) continues to run.
		The indicator turns off and compressor restarts
		automatically when the refrigerant pressure rises to
		the limit of the low-pressure cutout switch. Call a
		qualified refrigeration service technician or contact
		the Service Department.
	Low Oil Pressure	The Low Oil Pressure light is installed on chillers
	Light	with a semi-hermetic compressor that have an oil
		pump. A differential pressure switch monitors the
		difference between crankcase pressure and oil pump
		pressure.
		If the pressure drops to an unsafe level for more
		than two minutes the switch will open the control
		wiring circuit, shutting off the compressor, turning
		the light on, but allowing the pump(s) to continue
		running. This is a manual reset switch. Call a
		qualified refrigeration service technician or the
		Service Department.
	Control Power	The green, lighted, sustained-on Control Power
	Lighted Switch	Switch lights whenever the switch is in the ON
		position and the control circuit is energized.
	Alarm Silence	The red momentary-on Alarm Silence Switch is
	Switch	used to turn off the audible alarm on chillers that are
		built with the audible or audible/visual alarm option.
		This switch is always provided and requires no
		additional wiring if either alarm option is installed at
		a later time.

2-40 HP Portable Chillers Chapter 4: Operation 33 of 70