Replacing The Motherboard - Conair MPA User Manual

1
Disconnect and lockout the main power supply.
2
Open the electrical enclosure door.
on the front panel counterclockwise to open.
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-
ing the orange shield.
6
Remove the mother-
board and shield
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
electrical enclosure. Tighten
the screws.
9
Reconnect the terminal
blocks and wires to the
new board.
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
Set dip switches 7 and 8 to the correct unit type.
Set switch 7 to ON and switch 8 to OFF for chillers.
11
Program output monitors on the new board.
See D
ISABLING OR
M
section.
AINTENANCE
UGH004/0999
OFF
ON
1 2 3 4 5 6 7 8
from the
OFF
in the
E O M
NABLING UTPUT ONITORS
microKool Portable Chillers
Turn the screw
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
1FS/ COMP AUX
3
PUMPDOWN
2
8 7 6 5 4 3 2 1
PUMPDOWN 1
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
110V
LLS/PURGE 3SOL 4
LLS/PURGE 3SOL + 3
PURGE 4SOL 2
PURGE 4 SOL + 1
F6
TCPL'S
SUP RET
1 2 3 4
3 PHASE INPUT
3 PHASE INPUT
F5
F5
UNLDR 2/ VENT 2 SOL +
UNLDR 2/ VENT 2 SOL
UNLDR 1/ COOL 1 SOL +
UNLDR 1/ COOL 1 SOL
F4
F4
PUMP
PUMP
PUMP OL
PUMP OL
F2
F2
PMP AUX
PMP AUX
1FS/ COMP AUX
1FS/ COMP AUX
OFF
8 7 6 5 4 3 2 1
PUMPDOWN
6 3 2 1
8 7 5 4
PUMPDOWN
HEAT/COMP
ON
ON
HEAT/COMP
CONFIGURATION
CONFIGURATION HTS/COMP OL
DIP SWITCH
DIP SWITCH HTS/COMP OL
F3
F3
N
C
NC
ALARM
NO
C
110V
LLS/PURGE 3SOL
LLS/PURGE 3SOL +
PURGE 4SOL
PURGE 4SOL +
TCPL'S
F6
TCPL'S
SUP RET
SUP RET
1 2 3 4 5 6 7 8 1 2 3 4
in the
R
EPLACING THE
M
OTHERBOARD
IMPORTANT:
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.
4
3
2
1
4
3
2
1
6
5
4
3
2
1
4
3
2
1
6
5
4
3
2
1
4
3
2
1
T
ROUBLESHOOTING
Always
6-15