GB-28
WT08432X01
9-5. Piping connections and valve operations
Before heating the brazed sections, remove the gas and oil that are trapped in the pipes.
- Failure to do so may generate fire, resulting in serious injury.
Ventilate the room while servicing the unit.
- If the refrigerant leaks, oxygen deficiency may result. If the leaked refrigerant comes in contact
with a heat source, toxic gas will be generated.
Store pipes indoors, and keep both ends of the pipes sealed until just before making a
flare connection or brazing. (Store elbows and other joints in plastic bags.)
- If dust, dirt, or water enters the refrigerant lines, the refrigerant oil will deteriorate and the
compressor will malfunction.
Keep the service valves closed until refrigerant charging is completed.
- Failure to do so will damage the unit.
Place a wet towel on the service valves before brazing the pipes to keep the temperature of
the valves from rising above 120ºC (248ºF).
- Failure to do so may result in equipment damage.
Keep the flame out of contact with the cables and metal sheet when brazing the pipes.
- Failure to do so may result in burnout or malfunction.
Braze the pipes with a nitrogen purge to avoid oxidation.
- Oxidized flux inside the refrigerant pipes will cause the refrigerant oil to deteriorate and cause
the compressor to malfunction.
9-5-1. Removing the pinched connecting pipes
The unit is shipped with the pinched connecting pipes attached to the high- and low-pressure side service valves to
prevent gas leakage.
Take the following steps
①
through
③
to remove the pinched connecting pipes before connecting refrigerant pipes to
the outdoor unit.
①
Check that the service valves are fully closed (turned clockwise all the way).
②
Remove the gas in the pinched connecting pipes, and drain out all the refrigerant oil. (See
Ⓔ
below.)
③
Remove the pinched connecting pipes. (See
Ⓕ
below.)
<A>
<B>
Ⓐ
Ⓒ
Ⓑ
Ⓓ
Ⓔ
Ⓕ
<A>
Refrigerant service valve (high-pressure/brazed)
<B>
Refrigerant service valve (low-pressure/brazed)
Ⓐ
Valve shaft
The unit is shipped with the valve closed. Keep the valve closed while connecting pipes or
evacuating the system. Open the valve upon completion of this work.
7XUQWKHVKDIWFRXQWHUFORFNZLVHDVIDUDVLWZLOOJRÛWRRSHQWKHYDOYHDQGFORFNZLVHWR
close it.
Ⓑ
Stopper pin
3UHYHQWVWKHVKDIWIURPWXUQLQJÛRUPRUH
Ⓒ
Service port
Through the service ports, you can charge refrigerant, remove the gas in the pinched
connecting pipes, or evacuate the system.
Ⓓ
Cap
Remove the cap before turning the shaft. Put the cap back on upon completion of all work.
Ⓔ
Severed section of the pinched connecting pipe
Ⓕ
Brazed section of the pinched connecting pipe
Summary of Contents for City Multi R2 Series
Page 2: ......
Page 62: ...GB 60 WT08432X01 ...