Conair MPW, MPA Checking And Replacing Fuses, To replace a blown fuse, If fuses continue to fail

This procedure covers the factory-installed fuses on the unit’s motherboard. If you have installed an electrical disconnect or emergency stop switch, additional fuses and/or breakers may have been used elsewhere in the in the main power circuit.

To replace a blown fuse:

1	Disconnect and lockout the main power.
2	Open the electrical enclosure door. Turn the screw
	on the front panel counterclockwise to open.
3	Replace the fuse. The fuses are located on the mother-
	board and are labeled and identified on the orange shield.
4	Close the electrical enclosure and restart the unit.

If fuses continue to fail:

❒Verify that the unit is receiving the correct voltage. Check the voltage, phasing and amperage ratings on the unit’s nameplate.

❒Verify that the unit’s transformer is operating correctly. Check for proper voltage (120V 10%) to the voltage sensing device for the fuse location.

❒Check all wiring referencing the fusing location for loose connections, damage or improper grounding. Verify that the correct device is being used for this fuse

location. See DISABLING OR ENABLING OUTPUT

MONITORS in the MAINTENANCE section.

CHECKING AND

REPLACING

FUSES

WARNING:

Shock Hazard

Only qualified service personnel familiar with electrical testing and industrial equipment should examine and correct problems that require opening the unit with power on to diagnose the cause of a problem.

						6 5 4 3 2 1	4 3 2 1
Fuse 1						LLS/WPS LLS/WPS AUTOSTART AUTOSTART HPS/LPS HPS/LPS	OPS OPS FSTAT FSTAT	L1	L2	L3
Control	AC IN 4	AC IN + 3	AC OUT 2	AC OUT + 1	F1			3 PHASE INPUT
power

F5					Fuse 5
				4
UNLDR 1/ VENT 2 SOL		+			Unloader valve 1
UNLDR 1/ VENT 2 SOL				3
UNLDR 2/ COOL 1 SOL		+		2
UNLDR 2/ COOL 1 SOL				1	Fuse 4
F4
					Unloader valve 2
	PUMP
			4
	PUMP		3
	PUMP OL			2
	PUMP OL		1

F2 Fuse 2

Pump

		PMP AUX	6
		PMP AUX	5
		1FS/ PURGE/ COMP AUX	4
OFF		1FS/ COMP AUX	3
	8 7 6 5 4 3 2 1	PUMPDOWN	2
		PUMPDOWN	1

IMPORTANT: Always refer to the wiring dia-

ON

CONFIGURATION

DIP SWITCH

HEAT/COMP

HEAT/COMP

HTS/COMP OL

HTS/COMP OL

F3

4
3
2
1	Fuse 3
6

grams that came with your chiller to locate spe-

ALARM

N

C

NC

5	Compressor
4
3

cific electrical compo-

+ 120 Ohm + TR TR GND GND + TR TR 120 Ohm (-2) CONTROL OPER PNL CABLE

NO

C 110V

LLS/PURGE 3SOL
LLS/PURGE 3SOL	+
PURGE 4SOL
PURGE 4 SOL	+
TCPL'S	F6
SUP RET
Y R R Y

2

1

4

3

2

Fuse 6

Level switch

nents. Illustrations in the User Guide are intended to be representative only.

1 2 3 4 5 6 7 8 1 2 3 4

UGH004/0999 microKool Portable Chillers TROUBLESHOOTING 6-13