Refrigerant Piping - Toshiba MMY-MAP0806HT8P-E Installation Manual

7

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
• 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.
• Pipes can be drawn out forward or downward from the
outdoor unit.
• When drawing out the pipe forward, draw it out to the
outside via the piping/wiring panel, and leave a space
of 500mm 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, 500mm or more space is required.)
• 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 5m or less.
Ball valve of gas
side
Packed valve of
liquid side
Packed valve of
balance pipe
(MAP080, MAP100, MAP120)
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Hook
Front panel
Piping/wiring panel
(Rear piping)
(Left
(Right
piping)
piping)
(Left piping)
(Right piping)
Drawing out
downward
Ball valve of gas
side
Ball valve of
liquid side
Packed valve of
balance pipe
(MAP140, MAP160, MAP180,
MAP200, MAP220)
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REQUIREMENT
• For 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.
• Be sure to use two spanners 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 two spanners, loosen or tighten the flare nut
while holding the valve mounting plate with a spanner.)
Outer dia. of
Tightening torque (N•m)
copper pipe
6.4 mm 14 to 18 (1.4 to 1.8 kgf•m)
9.5 mm 33 to 42 (3.3 to 4.2 kgf•m)
12.7 mm 50 to 62 (5.0 to 6.2 kgf•m)
15.9 mm 68 to 82 (6.8 to 8.2 kgf•m)
19.1 mm 100 to 120 (10 to 12 kgf•m)
Pipe connection method of valve at the gas side (Example)
Pipe-diameter
Type Draw-out forward
Gas Liquid
Cut the L-shaped pipe at the horizontal
straight section, then braze the supplied
MAP080 Ø19.1 Ø12.7
attachment pipe and the socket and pipe
procured locally.
Liquid
MAP100 Ø22.2 Ø12.7
pipe
Balance
pipe
MAP120 Ø28.6 Ø12.7
Cut the L-shaped pipe at the horizontal
straight section, then braze the supplied
attachment pipe, and the socket and pipe
procured locally.
MAP140
Ø28.6 Ø15.9 Liquid
MAP160
pipe
Balance
pipe
Packed valve of
balance pipe
Ball valve of gas side
Packed valve of liquid
side
Draw-out downward
Cut the L-shaped pipe at the vertical straight
section, then braze the supplied attachment
pipe and the socket and pipe procured
locally.
Gas
Gas pipe
pipe
Liquid
Gas pipe
Attachment
pipe
pipe
Attachment
Balance
Socket
pipe
pipe
Pipe
Socket
Pipe
Section
to be cut
Cut the L-shape pipe at the vertical straight
section, then braze the supplied attachment
pipe, and the socket and pipe procured
locally.
Gas
pipe
Gas pipe Liquid
Gas pipe
pipe
Attachment pipe
Attachment
Balance
Socket
pipe
pipe
Pipe
Socket
Pipe
Section
to be cut
Gas
pipe
Section
to be cut
Gas
pipe
Section
to be cut
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