Refrigerant Piping - Toshiba MMY-MAP0726FT2P-UL Installation Manual

7

Refrigerant piping

WARNING
If the refrigerant gas leaks during installation, ventilate the room.
•
• After installation, check that the refrigerant gas does not leak.
If the refrigerant gas leaks into the room and comes into contact with fi re such as a fan heater, stove, or
kitchen range, noxious gas may be generated.
■ Connection of refrigerant pipe
• The service valves are inside the outdoor unit. To
access them, 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.
• To draw out the pipe forward, draw it out to the
outside via the piping/wiring panel, and leave a space
of 19.7" (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, 19.7" (500mm)
or more space is required.)
• To draw 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 16.4 ft (5m) or less.
15-EN
1122001201_EN FR.indd 8 1122001201_EN FR.indd 8
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 pipe
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.
• Be sure to use two spanners to loosen or tighten the fl are nut. If a single spanner is used, the required level of
tightening cannot be obtained. Tighten the fl are nut with the specifi ed torque. (If it is hard to loosen or tighten the
fl are nut of the balance pipe or packed valve of the liquid side with two spanners, loosen or tighten the fl are nut
while holding the valve mounting plate with a spanner.)
Unit: ft•lbs (N•m)
Outer dia. of
Tightening torque
copper pipe
Ø1/4 (6.4 mm) 10 to 13 (14 to 18)
Ø3/8 (9.5 mm) 24 to 31 (33 to 42)
Ø1/2 (12.7 mm) 37 to 46 (50 to 62)
Ø5/8 (15.9 mm) 50 to 60 (68 to 82)
Pipe connection method (Example)
Draw-out forward
Suction-side gas Cut the L-shaped pipe, then braze the
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.
Discharge-side
Suction-side
gas pipe Suction-side
gas pipe
Balance
Liquid pipe
pipe
L-shaped
Section
pipe
to be cut
Pipe
Attachment
pipe
Socket
Attachment
Pipe
pipe
Elbow
Socket Pipe
Pipe
– 8 –
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 gas Cut the L-shaped pipe, then braze the
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
L-shaped
pipe
pipe
Attachment
pipe
Socket
Pipe
Socket
Socket
Pipe
Pipe
Suction-side
gas pipe
Section
to be cut
EN
FR
16-EN
9/2/16 1:30 PM 9/2/16 1:30 PM