Toshiba MMY-MAP0726FT2P-UL - Page 249

9 4-way valve
-
detachment/
attachment
MMY-
MAP0726FT*
WARNING
Wear a pair of gloves.
Otherwise, you will risk an injury involving a
replacement part or some other object.
Before starting the work, be sure to recover the
refrigerant of outdoor unit by removing it with a
refrigerant recovery device.
1. Detachment
1)Remove the lower cabinet (front side).
2)Remove the inverter box in accordance with the
dismantling instructions.
3)Disconnect the 4-way valve coil, SV52 valve coil
(*1
), PMV1 coil and PMV4 coil and get all wiring
located near the 4-way valve out of the way.
4)Remove brazed points for the PMV assembly,
which is placed in front of the 4-way valve.
* Provide adequate cover for the PMV to protect it
from overheating.
5)Since it is difficult to simultaneously remove the
brazed points for the pipes located above the 4-
way valve (3 locations), cut through them just
below the brazed points using a saw, etc.
6)Detach the pipe located below the 4-way valve.
7)Remove the end sections of the pipes above the
4-way valve, which were cut in step 5).
8)Install a new 4-way valve.
* Provide adequate cover for the 4-way valve to
protect it from overheating. During the installation,
insert pipes firmly into the 4-way valve, or a
blockage or leakage involving brazing filler metal
may result.
9)Reinstall the PMV assembly, which was removed
in step 4).
* Provide adequate cover for the PMV to protect it
from overheating.
10) Reinstall all the coils removed in step 3), and put
the wiring back to its initial state.
11) Reinstall the inverter box in accordance with the
installation instructions.
12) Reinstall the lower cabinet.
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7) End section of pipes (3 locations)
5)
Cutting line
Brazed point
4-way valve
7) End sections of pipes (3 locations)
5) Cutting line
Brazed point
4-way valve
PMV1
PMV3
PMV4
PMV assembly
Removing of brazed point
at right of strainer (3 locations)
Removing of brazed point
at back of PMV (1 location)
Before removal of PMV assembly
Removing of brazed point
at tip of joint pipe (1 location)
Cutting through of
pipes located above
4-way valve (3 location)
Removing of brazed point
for pipe located below
4-way valve (1 location)
After removal of PMV assembly