87
• Take down the valve cap, suction gas pipe, HP gas pipe turns to "open"
• Turn the liquid pipe and the oil equalization pipe with hexangular spanner until it stops. If opening the valve
strongly, the valve will be damaged.
• Tighten the valve cap.
D. Check valve operation
Open/ close method: (The suction gas pipe stop valve for AV08IMVURA, AV10IMVURA, AV12IMVURA,AV14IMVU
RA,AV16IMVURA,AV18IMVURA,AV20IMVURA,AV22IMVURA)
"open"state "close"state
Tighten torque as the table below:
Tighten torque N·m
Shaft (valve body) Cap (cover) T-shape nut (check joint)
For suction gas pipe and HP gas pipe Less than 7 Less than 30 13
For liquid pipe 7.85 (MAX15.7) 29.4 (MAX39.2) 8.8 (MAX14.7)
For oil equalization pipe 4.9 (MAX11.8) 16.2 (MAX24.5) 8.8 (MAX14.7)
E. Additional refrigerant charging
Charge the additional refrigerant as liquid state with the gauge.
If the additional refrigerant can not be charged totally when the outdoor stops, charge it at the trial mode.
If the unit runs for a long period in the state of lack of refrigerant, compressor will occur failure.
( the charging must be nished within 30 minutes especially when the unit is running, meanwhile charging the
refrigerant).
The unit is charged only part of the refrigerant at the factory, also need additional refrigerant at the installation site.
W1: Refrigerant charging volume to outdoor unit at factory.
W2: Refrigerant charging volume to outdoor unit on site.
W3: Refrigerant charging volume to liquid pipe base on different piping length calculation.
W3=actual length of liquid pipe×additional amount per meter liquid pipe=
L1×0.35+L2×0.25+L3×0.17+L4×0.11+L5×0.054+L6×0.022
L1: Total length of 22.22 liquid pipe; L2: Total length of 19.05 liquid pipe;
L3: Total length of 15.88 liquid pipe; L4: Total length of 12.7 liquid pipe;
L5: Total length of 9.52 liquid pipe; L6: Total length of 6.35 liquid pipe;
Total refrigerant volume charging on site during installation=W2+W3
W: Total refrigerant volume charging on site for maintenance.
Refrigerant record form
Model
W1:
Refrigerant
charging
volume to
outdoor unit
at factory
W2:
Refrigerant
charging
volume to
outdoor
unit on site
W3: Refrigerant charging volume to
liquid pipe base on different piping
length calculation
Total refrigerant
volume charging
on site during
installation
W: Total refrigerant
volume charging on
site for maintenance
Liquid pipe
diameter
(mm)
Additional refrigerant
amount
(kg)
AV08IMVURA 10kg 1.0kg Ø9.52 0.054kg/m×__m=__kg
W2+W3=___kg W1+W2+W3=___kg
AV10IMVURA 10kg 1.0kg Ø9.52 0.054kg/m×__m=__kg
AV12IMVURA 10kg 2.5kg Ø12.7 0.11kg/m×__m=__kg
AV14IMVURA 10kg 2.5kg Ø12.7 0.11kg/m×__m=__kg
AV16IMVURA 10kg 5.5kg Ø12.7 0.11kg/m×__m=__kg
AV18IMVURA 10kg 5.5kg Ø15.88 0.17kg/m×__m=__kg
AV20IMVURA 10kg 7.0kg Ø15.88 0.17kg/m×__m=__kg
AV22IMVURA 10kg 7.0kg Ø15.88 0.17kg/m×__m=__kg
W3=___kg
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