Work Procedure After Repair - Carrier MMY-MAP0724FT9UL Service Manual

11-3. Work procedure after Repair

When vacuuming in the repaired outdoor unit, follow the procedure described below.
<Work procedure>
(1) Fully open PMV1 and 2 and PMV4 in accordance with the table below.
Note: PMV full-opening operation via short-circuiting of the CN30 pins is automatically undone after 2
minutes, causing the valves to fully close. To maintain fully open state, turn off the power switch of the
outdoor unit within 2 minutes of the short-circuiting of the CN30 pins.
SW12
Bit 1 Bit 2
OFF OFF
OFF ON
(2) Be sure to perform vacuuming in from the three check joints shown in the diagram below (liquid pipe,
discharge pipe and suction pipe).
CN30
Bit 3 Bit 4
OFF OFF Short-circuit
OFF OFF Short-circuit
PMV operation
PMV1 and 2 fully open for 2 minutes.
PMV4 fully opens for 2 minutes.
Check joint
(Low-pressure)
Check joint
(Liquid pipe)
– 215 –
Check joint
(High-pressure)