SERVICE MANUAL - Alarko Carrier

No.
Part name
Procedure
Remarks
3
Control
board
assembly
1. Disconnect lead wires and connectors connected
from the control board assembly to other parts.
1) Lead wires
• Connection with terminal block : 7 wires
(Red, Orange, Pink, Yellow, Black and two White
wires)
• Connection with compressor :
Remove the fastons (3 places at compressor side).
• Connection with reactor :
Remove the connector from P08, 09
(2P, White) and P12, P13 (2P, Gray).
• Connection with 4-way valve :
Remove the connector (3P).
• Connection with case thermo. :
Remove the connector (2P).
2) Connectors
• Sub-control board assembly side
CN300 : Outdoor fan (3P, White)
CN301 : Outdoor fan position detection (5P, White)
CN601 : TO sensor (2P, White)
CN602 : TD sensor (3P, White)
CN603 : TS sensor (2P, Black)
CN604 : TE sensor (2P, White)
CN605 : TGa sensor (3P, Yellow)
CN606 : TGb sensor (3P, White)
CN607 : TGc sensor (3P, Green)
CN608 : TGd sensor (2P, Blue)
CN701 : A room pulse motor valve (6P, Yellow)
CN702 : B room pulse motor valve (6P, White)
CN703 : C room pulse motor valve (6P, Red)
CN704 : D room pulse motor valve (6P, Blue)
2. Disconnect cable connecting the main control board
assembly side and sub-control board assembly.
• Main control board assembly side
CN04 : Connecting cable (3P, White)
CN05 : Connecting cable (2P, White)
CN06 : Connecting cable (5P, Red)
CN13 : Connecting cable (5P, Red)
• Sub-control board assembly side
CN302 : Connecting cable (3P, White)
CN303 : Connecting cable (2P, White)
CN501 : Connecting cable (3P, Red)
CN800 : Connecting cable (5P, Red)
3. The connecting cable connecting compressor and
P.C. board base and that connecting reactor and P.C.
board base are fixed to the inverter box with bundling
band. Cut off bundling band.
4. The connecting cables of the main P.C. board base
and the sub-P.C. board base are fixed with bundling
band. Cut off bundling band.
5. Remove the control board assembly from P.C. board
base.
1) Main control board assembly side
CN601~
CN608
CN301 CN300
CN704
CN703
CN702
CN701
CN300, CN302, CN303, CN501,
CN604, CN606, CN701, CN702,
CN703, CN704, 4-way valve
connector, case thermo. connector
at the sub-control board
assembly side are connectors
with locks. Therefore, remove the
connector while pushing the part
indicated by an arrow.
P.C. board base
P.C. board
When mounting a new board,
check that the board is correctly
set in the groove of base holder
of P.C. board base.
• Remove two claws of P.C. board base, and remove upward the heat sink by hands.
• Remove three screws fixing the heat sink and main control board assembly side.
• Remove red, orange, brown, and black connecting cables connected to the diode
block.
• Replace the P.C. board with a new one.
2) Sub-control board assembly side
• Remove P.C. board base from the inverter box.
• Remove three claws of P.C. board base, and replace the board with a new one.
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