Conair UGH016/0500 manual Checking Pressure Switches, Time, WARNING Coolant hazard

CHECKING

PRESSURE

SWITCHES

WARNING: Coolant hazard

Coolant can cause freezing of skin. All proper precautions should be taken any time the cool- ing system is worked on. Any adjustment that involves the coolant should only be performed by a certified refrigeration technician.

The pressure switch is a non-adjustable switch. To check the pressure switch:

1

Locate the pressure switch.

Always refer to the wiring dia- grams you received with your chiller to locate specific elec- trical components.

	Use the wiring diagrams that came with your chiller for
	exact location. Location varies depending on size of unit.
2	Check the connections.
	Make sure all connections to the switch are secure.
	Tighten as needed.
3	Check the control signal in the electrical panel.
	Refer to the wiring diagram and the following table for
	the switch status:

Inputs

Outputs

I 1 2 3 4 5 6 7 8 9 10 11 12

			DAY
						TIME
O	1	2		3	4	5	6	7	8

In this example, inputs 7 and 8 are highlighted; they are in normal position. If they are not highlighted the input is out of range.

Input	Description	Output	Description
1	Chiller Stop	1	Compressor Starter
2	Chiller Start
		2	Compressor Run Lamp
3	Level Switch
		3	Pump Starter
4	Flow Switch
		4	Pump Run Lamp
5	Compressor Running
		5	Alarm Lamp
6	Pump Running
		6	Optional Auto-Fill Solenoid
7	Suction Pressure Switch
		7	Optional Alarm Bell
8	Discharge Pressure Switch
		8	Optional Alarm Strobe
9	Low Temperature Deviation
10	Optional Auto-Fill Level Switch
11	Pressure Differential Switch
	(7.5, 10, 15 ton only)
12	Optional Alarm Silence

6-22TROUBLESHOOTING Series 1 Portable Chillers, TIC Control UGH016/0500