GB-26
WT07282X01
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.)
P models
EP models
<A>
<B>
<A>
<B>
Ⓐ
Ⓐ
Ⓐ
Ⓑ
Ⓒ
Ⓒ
Ⓒ
Ⓓ
Ⓓ
Ⓔ
Ⓔ
Ⓕ
Ⓕ
<B>
<C>
<A>
Ⓐ
Ⓓ
Ⓒ
Ⓕ
Ⓔ
Ⓒ
Ⓑ
Ⓐ
P200 to P400
P450, P500
EP200 to EP500
Summary of Contents for PURY-(E)P-YLM-A (-BS)
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