Carrier MMY-MAP0724FT9UL Service Manual page 232

No. Part to be replaced
5-2 Inverter assembly -
Replacing circuit
boards and
electrical
components
(460 V FT6UL)
Work procedure
WARNING
Wear gloves.
Failure to wear gloves creates the risk
of personal injury by part replacement
and other objects.
1. Interface board
1) Stop operation of the outdoor unit and turn
off the breaker.
2) Detach wires and then remove the board
from the card edge spacer in the corner.
2. Transformer relay board
1) Stop operation of the outdoor unit and turn
off the breaker.
2) Detach wires and then remove the board
from the card edge spacer in the corner.
3. A3-Compressor IPDU board
1) Stop operation of the outdoor unit and turn
off the breaker.
2) Remove the screws that secure the heat
sink.
(heat sink)
(M4 x 0.6" (15 mm), 2 pcs, M3 x 0.8" (20 mm),
2 pcs)*
3) Remove the screws that secure the upper
right corner and lower right corner of the
board.
(M3 x 0.4" (10 mm), 2 pcs)*
4) Remove the compressor leads (U, V, W).
5) Remove the four double-lock spacers
located at the edges of the board and within
the board.
* Tightening torque of board fixing heat sink
screws
Tightening torque of M4 screws
(0.7± 0.07 ft•lbs (0.98±0.1 N•m))
Tightening torque of M3 screws
(0.4± 0.07 ft•lbs (0.55±0.1 N•m))
4. Fan IPDU board
1) Stop operation of the outdoor unit and turn
off the breaker.
2) Remove the screws that secure the heat
sink.
(heat sink)
(M3 x 0.8" (20 mm), 5 pcs)*
3) Detach wires.
4) Remove the board from the card edge
spacer in the corner.
* Tightening torque of board fixing heat sink
screws
Tightening torque of M3 screws
(0.4± 0.07 ft•lbs (0.55±0.1 N•m))
* Installation
5) Adjust the position of the sub heat sink with
the cutout.
(An improperly aligned sub heat sink can
interfere with proper device function due to
reduced thermal efficiency.)
Transformer relay board
A3-Compressor IPDU board
(For Compressor 1 drive)
5) Double-lock spacers
3) M3 screw
Align with cutout
Align with cutout
– 232 –
Remarks
Interface board (control board)
FAN IPDU board Noise filter board
A3-Compressor IPDU board
(For Compressor 3 board)
A3-Compressor IPDU board
(For Compressor 2 board)
Transformer relay board
Tightening locations for
board screws
3) M3 screw
2) M4 screw
Compressor IPDU boar
2) M3 screw
5) Sub heat sink
Fan IPDU board
2) M3 screw