Sanyo ECO G SPW-GU055XH, Technical Data & Service Manual, Page: 46 / 242

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Design of W-2WAY ECO-i SYSTEM Unit Specifications
1
2
3
4
5
6
7
8
4. Installation Instructions
Tubing
cover
Bottom
plate
Tubing routed out
through the front side
Tubing routed out
through the bottom
Brazing locations
Field-supply tube
Taping
Remote valve
Nitrogen
Pressure-reducing valve (regulator)
Work method
Service port cap
(width 15 mm)
(0705
L
0905 Type) (1155
L
1305
L
1405 Type)
Service port cap
(width 15 mm, 17 mm)
Service port cap
(width 15 mm)
Flare nut
(
ø
6.35 mm)
Flare nut
(
ø 9.52 mm)
Service port cap
(width 15 mm)
Valve cap
(width 22 mm)
Valve cap
(width 22 mm, 24 mm)
Valve cap
(width 22 mm)
Valve cap
(width 22 mm)
Service port cap
(width 17 mm)
Service port cap
(width 15 mm)
Flare nut
(
ø
6.35 mm)
Flare nut
(
ø 12.7 mm)
Service port cap
(width 15 mm)
Valve cap
(width 24 mm)
Valve cap
(width 22 mm)
Valve cap
(width 22 mm)
Cap tightening torque
* Be careful of the cap sizes. The sizes of the service port cap and valve cap on
the 1155
–
1405 type liquid tube valves are different from other valve caps.
Use two monkey wrenches, as shown in the figure,
when removing the liquid tube valve flare nut.
1. Do not apply a wrench to the valve cap when removing or
installing the flare nuts. Doing so may damage the valve.
7
–
12 N
·
m (70
–
120 kgf
·
cm)
20
–
25 N
·
m (200
–
250 kgf
·
cm)
Do not apply a monkey wrench
to the hexagonal part.
Do not use two monkey wrenches when
removing or installing the balance tube
flare nut. In particular, do not apply a
monkey wrench to the hexagonal part at
the top of the valve.
(If force is applied to this part,
gas leakage will occur.)
2. If the valve cap is left off for a long period of time, refrigerant
leakage will occur. Therefore, do not leave the valve cap off.
3. Applying refrigerant oil to the flare surface can be effective in
preventing gas leakage, however be sure to use a refrigerant
oil which is suitable for the refrigerant that is used in the system.
(This unit utilizes R410A refrigerant, and the refrigerant oil is
ether oil (synthetic oil). However, hub oil (synthetic oil) can also
be used.)
Refrigerant tube port
Use caulking, putty, or a similar material to fill any gaps at
the refrigerant tube port (
) in order to prevent rainwa-
ter, dust or foreign substances from entering the unit.
* Perform this work even if the tubing is routed out in a
downward direction.
Tighten each cap as specified below.
Tightening torque for each cap
Precautions for brazing
Be sure to replace the air inside the tube with nitrogen to prevent oxide film from forming during the brazing process. Be sure
to use a damp cloth or other means to cool the valve unit during brazing.
1. Be sure to use nitrogen. (Oxygen, CO
2
, and CFC must not be used.)
2. Use a pressure-reducing valve on the nitrogen tank.
3. Do not use agents intended to prevent the formation of oxide film. They will adversely affect the
refrigeration oil, and may cause equipment failure.
4. The balance tube is not used if only 1 outdoor unit is installed. Use the unit in the same condi-
tions as when it was shipped from the factory.
CAUTION