Conair MPA Replacing The Freezestat, 6-18, Disconnect and lockout the power supply, Locate the

REPLACING THE FREEZESTAT

WARNING: Electrical shock hazard

Before attempting maintenance of any kind, stop the unit and disconnect and lock out the main power supply.

The freezestat unit is a bulb and capillary thermostat. To replace the unit:

1 Shut down the chiller and disconnect the process fluid lines.

	2	Disconnect and lockout the power supply.
		Drain the tank
	3
		of all fluid through
		the drain valve in the
		base of the tank.
	4	Locate the
		freezestat bulb.
		The bulb sensor is
		located on the
		process piping just
			Drain valve
		after the evaporator.
				Evaporator
		Remove the insulation around the bulb.
	5
		Detach the bulb from the process line.
	6
	7	Open the chiller electrical enclosure and locate
		the freezestat unit.
		Disconnect freezestat unit wires from their ter-
	8
		minals. Mark the wires so that you can easily reconnect
		the new unit to the appropriate terminals..
	9	Loosen the screws holding the freezestat unit to
		the electrical panel.
10		Remove the entire freezestat unit.
		Threat the bulb and capillary through the raceway.
11		Reverse the process to install the new unit. Be
		sure to insert the bulb sensor completely into the process
		piping well and replace the insulation around the bulb.

6-18 TROUBLESHOOTING microKool Portable Chillers UGH004/0999