Conair MPW, MPA manual Replacing The Motherboard, Disconnect and lockout the main power supply

1

2

Disconnect and lockout the main power supply.

Open the electrical enclosure door. Turn the screw on the front panel counterclockwise to open.

REPLACING THE MOTHERBOARD

3 Mark or label each wire connected to the mother- board. The orange shield is labeled with the connection information. You must label the wires to ensure they are con- nected to the correct terminals on the new motherboard.

4 Disconnect the wires from the motherboard by pulling the terminal blocks up.

5 Loosen the screws hold-

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

		F5
		UNLDR 1/ VENT 2 SOL		+	4
		UNLDR 1/ VENT 2 SOL			3
		UNLDR 2/ COOL 1 SOL		+	2
		UNLDR 2/ COOL 1 SOL			1
		F4
			PUMP
					4
			PUMP		3
			PUMP OL		2
			PUMP OL		1
		F2
		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

			ON									HEAT/COMP			4
												HEAT/COMP
															3
						CONFIGURATION						HTS/COMP OL
															2
							DIP SWITCH					HTS/COMP OL
															1
												F3			6
														N
															5
														C
															4
													NC
												ALARM			3
													NO
															2
														C
															1
								CONTROL2)-( CABLEPNLOPER					110V
Ohm120+	TR+	TR	GND	GND	TR+	TR	Ohm120		SUP RET
															4
									LLS/PURGE 3SOL
									LLS/PURGE 3SOL					+	3
											PURGE 4SOL				2
										PURGE 4 SOL				+	1
									TCPL'S					F6
									Y R R Y
1	2	3	4	5	6	7	8		1	2	3	4

IMPORTANT: Always refer to the wiring dia- grams that came with your chiller to locate spe- cific electrical compo- nents. Illustrations in the User Guide are intended to be representative only.

ing the orange shield.

6 Remove the mother- board and shield from the electrical enclosure as a unit.

7 Remove the mother- board from the shield

and replace with the new motherboard.

8 Reattach the shield and new motherboard in the

electrical enclosure. Tighten the screws.

9 Reconnect the terminal blocks and wires to the new board.

6 5 4 3 2 1 4 3 2 1

4INAC	3+INAC	2OUTAC	1+OUTAC	F1	LLS/WPS LLS/WPS AUTOSTART AUTOSTART HPS/LPS HPS/LPS	OPS OPS FSTAT FSTAT	L1	L2	L3
							3 PHASE INPUT

F5		F5
UNLDR 2/ VENT 2 SOL	+		4
			3
UNLDR 2/ VENT 2 SOL
			2
UNLDR 1/ COOL 1 SOL	+
			1
UNLDR 1/ COOL 1 SOL		F4
F4				4
PUMP
				3
PUMP
				2
PUMP OL
				1
PUMP OL		F2
F2

														PMP AUX				6
																		5
														PMP AUX				4
														1FS/ COMP AUX				3
														1FS/ COMP AUX
		OFF																2
														PUMPDOWN
							8	7	6	5	4	3	2 1					1
														PUMPDOWN
														HEAT/COMP				4
		ON												HEAT/COMP				3
					CONFIGURATION									HTS/COMP OL				2
						DIP SWITCH								HTS/COMP OL				1
														F3			F3	6
																		5
																N
																		4
																C
														ALARM	NC			3
															NO			2
																		1
																C
Ohm120+	TR+	TR GND	GND	TR+	TR Ohm120						CONTROL2)-(	CABLEPNLOPER		SUP RET	110V			4
														LLS/PURGE 3SOL				3
														LLS/PURGE 3SOL		+		2
														PURGE 4SOL		+		1
														PURGE 4SOL
														TCPL'S		F6
														Y R R Y
					1	2	3		4	5		6	7	8

Make sure you align the terminal blocks with the correct pins on the board. Push the terminal blocks onto the pins, taking care not to bend any pins.

10

11

Set dip switches 7 and 8 to the correct unit type.

Set switch 7 to ON and switch 8 to OFF for chillers.

Program output monitors on the new board.

See DISABLING OR ENABLING OUTPUT MONITORS in the

MAINTENANCE section.

UGH004/0999 microKool Portable Chillers TROUBLESHOOTING 6-15