Mitsubishi Electric PUHY-P200YKB-A1.TH [25/106] 5 piping connections and valve operations

Mitsubishi Electric PUHY-P200YKB-A1.TH [25/106] 5 piping connections and valve operations
GB
GB-23
KD79S703H01
Pipes B,C,D [mm (in)]
Total capacity of indoor units
Pipe
Liquid Gas
140 or below ø9.52 (ø3/8) ø15.88 (ø5/8)
141 to 200 ø9.52 (ø3/8) ø19.05 (ø3/4)
201 to 300 ø9.52 (ø3/8) ø22.2 (ø7/8)
301 to 400 ø12.7 (ø1/2) ø28.58 (ø1-1/8)
401 to 650 ø15.88 (ø5/8) ø28.58 (ø1-1/8)
651 to 800 ø19.05 (ø3/4) ø34.93 (ø1-3/8)
801 or above ø19.05 (ø3/4) ø41.28 (ø1-5/8)
Pipes a,b,c,d,e [mm (in)]
Capacity index of indoor unit
Pipe
Liquid Gas
20, 25, 32, 40, 50 ø6.35 (ø1/4) ø12.7 (ø1/2)
63, 71, 80, 100, 125, 140 ø9.52 (ø3/8) ø15.88 (ø5/8)
200 ø9.52 (ø3/8) ø19.05 (ø3/4)
250 ø9.52 (ø3/8) ø22.2 (ø7/8)
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.

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