Refrigerant Piping - Toshiba MMY-MAP1006FT8P-UK 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.
• 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.
27-EN
AMP Air Conditioning
Hook
Front panel
Piping/wiring panel
(Rear piping)
(Left
(Right
piping)
piping)
(Left piping)
(Right piping)
Drawing out
downward
Packed valve of liquid side
Ball valve of suction gas side
Packed valve of balance pipe
Ball valve of discharge gas side
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 (Example)
Draw-out forward
Suction-side Cut the L-shaped pipe, then braze the
gas pipe socket procured locally.
Discharge-side Braze the supplied attachment pipe
gas pipe and elbow procured locally.
Braze the supplied attachment pipe
Liquid pipe
and socket procured locally.
Suction-side
Discharge-side
Suction-side
gas pipe
gas pipe
Balance
Liquid pipe pipe
L-shaped
Section
pipe
to be cut
Pipe
Attachment
pipe
Socket
Attachment
pipe
Pipe
Elbow
Socket
Pipe Pipe
– 1 4 –
Do not apply refrigerating oil to the surface of
the flare.
Ball valve of discharge gas side
Do not clamp the service port
with two spanners, doing so may
damage the service port.
Draw-out downward
Suction-side Cut the L-shaped pipe, then braze the
gas pipe socket procured locally.
Discharge-side Braze the supplied attachment pipe
gas pipe and socket procured locally.
Braze the supplied attachment pipe
Liquid pipe
and socket procured locally.
Discharge-side
Suction-side
gas pipe
gas pipe
gas pipe
Liquid pipe
Balance
pipe
Pipe
Attachment
pipe
L-shaped
Attachment pipe
pipe
Socket
Pipe
Socket
Socket
Pipe
Pipe
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Suction-side
gas pipe
Section
to be cut
28-EN