Carrier MMY-MAP0724FT9UL Service Manual page 230

No. Part to be replaced
5-1 Assembling inverter -
Replacing boards /
electric components
(208/230 V FT9UL)
Work procedure
WARNING
Wear a pair of gloves.
Otherwise, you will risk an injury involving
a replacement part or some other object.
1. Interface board
1) Stop the air conditioner operation, and turn off the
circuit breaker.
2) Remove the wires and then the board from the card
edge spacer of the corner.
2. A3-Compressor IPDU board
1) Stop the air conditioner operation, and turn off the
circuit breaker.
2) Remove the screws that fix the heat sink
(radiation plate). *1
(M4 x 0.6" (15 mm), 2 pcs, M3 x 0.8" (20 mm), 3
pcs.)
3) Remove the comp lead (U, V, W). *2
4) Remove the board from the card edge spacer of the
corner.
*1Screw tightening torque for heat sink fixing board M4
screw tightening torque
(0.7 ± 0.07 ft•lbs (0.98 ±0.1 N•m))
M3 screw tightening torque
(0.4 ± 0.07 ft•lbs (0.55 ±0.1 N•m))
*2Comp lead (U, V, W) tightening torque
M4 screw tightening torque
(0.9 ± 0.07 ft•lbs (1.2 ±0.1 N•m))
3. Fan IPDU board
1) Stop the air conditioner operation, and turn off the
circuit breaker.
2) Remove the screws that fix the heat sink
(radiation plate). *
(M3 x 0.8" (20 mm), 5 pcs.)
3) Remove the wires.
4) Remove the board from the card edge spacer of the
corner.
* Screw tightening torque for heat sink fixing board
M3 screw tightening torque
(0.4 ± 0.07 ft•lbs (0.55 ±0.1 N•m))
* Notes on attaching.
5) Adjust the sub heat sink to the cutout.
(If the sub heat sink is not aligned properly, radiation
may be less efficient and a malfunction may occur.)
– 230 –
Remarks
1) I/F board (Control board)
3) IPDU board for fan 1) Noise filtering board
2) A3-IPDU board 2) A3-IPDU board
(for driving comp 1) (for driving comp 3)
2) A3-IPDU board (for driving comp 2)
2) M4 screw
2) Screw
Adjust to the cutout
5) Sub heat sink
Adjust to the cutout
2) M3 screw