Toshiba MMY-MAP0804FT8-E Installation Manual Download Page 11

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Refrigerant piping

WARNING

•

If the refrigerant gas leaks during installation, ventilate the room.

If the leaked refrigerant gas comes into contact with fire, noxious gas may be generated.

•

After installation, check that the refrigerant gas does not leak.

If the refrigerant gas leaks into the room and comes into contact with fire such as a fan heater, stove, or kitchen range,
noxious gas may be generated.



Connection of refrigerant pipe

1. The refrigerant pipe connecting section is set in the

outdoor unit. Remove the front panel and the piping /
wiring panel. (M5: 9 pcs.)
• As shown in the illustration on the right, the hooks

are at the right and left sides of the front panel. Lift
up and remove the front panel.

2. Pipes can be drawn out forward or downward from the

outdoor unit.

3. When drawing out the pipe forward, draw it out to the

outside via the piping / wiring panel, and leave a space
of 500 mm or more from the main pipe connecting the
outdoor unit with the indoor unit, considering service
work or other work on the unit. (For replacing the
compressor, 500 mm or more space is required.)

4. When drawing out the pipe downward, remove the

knockouts on the base plate of the outdoor unit, draw
the pipes out of the outdoor unit, and perform piping on
the right / left or rear side. Downward length of the
balance pipe should be 5 m or less.

5. Wrap a wet cloth around the valve of the pipe

connector valve to keep it cool during brazing.
(If it is not cooled enough, the heat may affect the
packing in the valve and cause gas leaks)

(MAP080

✽

, MAP100

✽

)

(MAP120

✽

, MAP140

✽

)

Front panel

Piping / wiring panel

(Rear piping)

Drawing out downward

(Left piping)

(Right piping)

Drawing out forward

Hook

(Left

piping)

(Right

piping)

Wet cloth

Packed valve of

liquid side
Ball valve of suction

gas side

Packed valve of

balance pipe

Ball valve of

discharge gas side

Packed valve of

liquid side
Ball valve of suction

gas side
Packed valve of

balance pipe

Ball valve of

discharge gas side

REQUIREMENT

• For a brazing work of the refrigerant pipes, be sure to use nitrogen gas in order to prevent oxidation of the inside

of the pipes; otherwise clogging of the refrigerating cycle due to oxidized scale may occur.

• Use clean and new pipes for the refrigerant pipes and perform piping work so that water or dust does not

contaminate the refrigerant.

* Remove all flux after brazing.

• Be sure to use a double spanner to loosen or tighten the flare nut. If a single spanner is used, the required level

of tightening cannot be obtained. Tighten the flare nut with the specified torque. (If it is hard to loosen or tighten
the flare nut of the balance pipe or packed valve of the liquid side with a double spanner, loosen or tighten the
flare nut while holding the valve mounting plate with a spanner.)

Pipe connection method of valve at the gas side (Example)

MMY-

Draw-out forward

Draw-out downward

MAP080

✽

MAP100

✽

Suction-side

gas pipe

Cut the L-shaped pipe, then braze the

supplied attachment pipe and socket