Panasonic S-200PE1E8, Technical Data & Service Manual

Page: 78 / 197

1-72
1 1
Cautions During Brazing
Replace air inside the tube with nitrogen gas to prevent copper oxide film from forming during the
brazing process. (Oxygen, carbon dioxide and Freon are not acceptable.)
Do not allow the tubing to get too hot during brazing.
The nitrogen gas inside the tubing may overheat, causing refrigerant system valves to become damaged.
Therefore allow the tubing to cool when brazing.
Use a reducing valve for the nitrogen cylinder.
Do not use agents intended to prevent the formation of oxide film. These agents adversely affect the
refrigerant and refrigerant oil, and may cause damage or malfunctions.
Caution Before Connecting Tubes Tightly
(1)
(2)
Apply a sealing cap or water-proof tape to prevent dust or
water from entering the tubes before they are used.
Be sure to apply refrigerant lubricant (ether oil) to the
inside of the flare nut before making piping connections.
This is effective for reducing gas leaks. (Fig. 1- 53)
Fig. 1- 53
(3) For proper connection, align the union tube and flare tube
straight with each other, then screw on the flare nut lightly
at first to obtain a smooth match. (Fig. 1- 54)
Fig. 1- 54
Adjust the shape of the liquid tube using a tube bender at the
installation site and connect it to the liquid tubing side valve
using a flare.
Apply refrigerant lubricant.
Flare nut
Union
2. Connecting Tubing Between Indoor and Outdoor Units
(1) Preparing the Tubing.
The tubing of the gas main has a diameter of ø25.4, but the connection to the service valve of the outdoor unit
has a diameter of ø19.05, so a flare has to be used.
Consequently, be sure to use the enclosed joint tube and reducing joint tube in making connections (braze).
Align the joint tube in the direction the tubing comes out and refer to the following references “Examples of
Making Tube Connections” 1 to 4 in cutting it to the required length and then braze it.
To protect the wiring and parts inside the unit, perform the brazing outside the unit. Also, take note that each
of the joint tubes in 1 to 3 have to be installed in a specific direction, so make sure they are as depicted in the
figure when you braze them.
Examples of Making Tube Connections
1. Out Front
Flare Process
26
0
2. Out Right
260
Flare Process
The connection
faces towards you
Sec1.indd 72 2014/11/07 10:28:09