Conair MPW Lo SAF, Possible cause Solution, Shut Down Alarms, failed See REPLACING THE FREEZESTAT

The chiller has detected a problem that could lead to equipment damage or personal injury if it is not corrected.

◆The Alarm LED lights and the STOP/RUN LED flashes red.

◆The chiller automatically shuts down.

◆The control displays a red LED or alarm code indicating the source of the problem.

SHUT DOWN ALARMS

Alarm Possible cause Solution

Lo SAF

Actual temperature of water supplied to the process is below the programmed 10° F safety limit.

Has the compressor contactor failed closed?

Has the unloader valve failed?

Has the freezestat failed?

Check phase continuity through the compressor con- tactor. If the contactor has failed, replace it. See

REPLACING THE COMPRESSOR CONTACTOR.

See CHECKING THE UNLOADER

VALVE.

❒Check the freezestat setting. It should be set to cut out at 5° F above the freeze point of the process fluid solution.

❒Check for improper freezes- tat installation. Verify the freezestat sensor bulb is

well insulated and inserted into the piping well.

If the freezestat is properly installed and set, it may have

failed See REPLACING THE

FREEZESTAT.

Pbr

Err

Is the thermocouple	Check for a loose thermocou-
loose?	ple or loose wire connections
	to the thermocouple.

The thermocouple
in the process			Has the thermocouple	Check the thermocouple and
return line failed.			failed?	replace if necessary.
			Is the thermocouple	Check for a loose thermocou-
	PbS	Err
			loose?	ple or loose wire connections
The thermocouple				to the thermocouple.
in the process			Has the thermocouple	Check the thermocouple and
supply line failed.			failed?	replace if necessary.

UGH004/0999 microKool Portable Chiller TROUBLESHOOTING 6-5