Toshiba MMY-MAP0804HT8(Z)(ZG)-E Service Manual page 275

No. Part to be replaced
9 4-way valve
- detachment/
attachment
MAP0804
MAP1004
MAP1204
Work procedure
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 and PMV coils (2
pieces) and get all wiring located near the 4-way
valve out of the way.
4) Remove brazed points (2 locations) 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 pieces), 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.
Removing of brazed point on
left side of strainer (1 location)
Removing of brazed point at
back of PMV (1 location)
Before Removal of PMV Assembly
4) Brazed point
7) End sections of pipes (3 pieces)
4-way valve
6) Brazed point
Cutting through of
pipes located above
4-way valve (3 pieces)
4-way valve
proper
Removing of brazed point
for pipe located below
4-way valve (1 location)
After Removal of PMV Assembly
274
Remarks
PMV
4) Brazed point
5) Cutting
line
PMV assembly