Airwell AWAU-YDV1010-H13, Руководство по обслуживанию

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75
Exposed length of copper pipe when flaring pipe: B (mm)
Outer diameter of
copper pipe
For rigid pipe (clutch-type)
When using the R410A
special tool
When using the
previous tool
Ø6.35
0-0.5 0.7-1.3
Ø9.52
Ø12.7
Ø15.88
For operating valves at liquid and gas pipe sides, fix the main valve body and install as per a proper tightening
torque as shown in the figure above.
Size of
operating
valve (mm)
Tightening
torque (N·m)
Angle of
tightening
torque (°)
Suggested
arm length
of tool (mm)
Ø6.35 (1/4″) 14~18 45~60 150
Ø9.52 (3/8″) 34~42 30~45 200
Ø12.7 (1/2″) 49~61 30~45 250
Ø15.88 (5/8″) 68~82 15~20 300
Ø19.05 (3/4″) 100~120 15~20 450
Do not use wrench on the
valve bonnet.
Use torque wrench. If there is no torque wrench,
screw the tapered nut tightly with hands before
tightening it according to the standards shown
above.
• When connecting flared pipe, don't apply oil on the flared part.
• Adopt brazing for connecting outdoor unit gas pipes with
refrigerant pipes and refrigerant pipe with branch pipes.
• It is necessary to charge nitrogen while welding. Otherwise, a
mass of foreign substance (oxidized film) will be generated to
block capillary tube and expansion valve, thus causing lethal fault.
• While welding operating valve with pipe, cool down the valve body with wet towel at the same time.
• Please rinse pipe. During rinsing, charge nitrogen into the pipe with the pressure around 0.02 MPa while
blocking the pipe ends with hand until pressure rises inside the pipe. (At the same time, plug other pipe ends.)
Operating sequence
Under pipe construction on site, turn off the operating valve completely.
It is necessary to fill nitrogen while welding. Otherwise, a mass of foreign substance (oxidized film) will be
generated to block capillary tube and expansion valve, thus causing lethal fault.
[ Nitrogen ]
Wrap
Welding
Use tape at pipe end for increasing
resistance to charge the pipe with nitrogen.
Only use nitrogen (N2).