Toshiba MMY-MAP0806FT8P-E Installation Manual page 9

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 are nut. If a single spanner is used, the required level of
tightening cannot be obtained. Tighten the are nut with the speci ed torque. (If it is hard to loosen or tighten the
are nut of the balance pipe or packed valve of the liquid side with two spanners, loosen or tighten the are 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
15-EN
Do not apply refrigerating oil to the surface of
the are.
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
Extruding margin of copper pipe with are machining: B (Unit: mm)
Copper pipe outer
dia.
9.5
12.7
15.9
19.1
Extruding margin of copper pipe with are tools: A (Unit: mm)
Copper pipe outer
dia.
9.5
12.7
15.9
19.1
• When using the conventional are tool, to connect R410A pipes with aring, make a margin approx. 0.5 mm
longer than that of an R22 pipe so that the are size matches the one speci ed. It is convenient to use a copper
pipe gauge for size adjustment of the extruding margin.
• The ared supplied attachment pipe (Ø19.1) must be used to connect with discharge-side gas pipe valve
(Ø19.1). (MAP120 to MAP200) Do not use half hard or hard materials instead of the supplied attachment pipe.
The half hard or hard materials may be cracked and may cause leakage of refrigerant when it is ared.
• Use the are nut provided with the product.
• After aring the connection, be sure the ared part is not damaged, deformed, uneven, or attened, and that
there are no cutting chips on it.
CAUTION
Wrap the ball valve in a wet cloth to keep it cool and prevent the heat from
the torch from damaging it when connecting the pipe to the ball valve on the
suction side gas line.
Suction-side
gas pipe
Section
to be cut
– 8 –
When using R410A When using
tool conventional tool
0 to 0.5 1.0 to 1.5
+0
A
0.4
13.2
16.6
19.7
24.0
Wet cloth
Torch
EN
ID
ID
16-EN