Johnson Controls YVAHP0721CW Series, Service Manual

Page: 75 / 416

SM-16007
1-61
INSTALLATION
(b) Operate the compressor in the cooling mode and charge the additional refrigerant from the check
joint of the liquid stop valve. An acceptable error must fall within 1.1 lbs (0.5 kg). At this time, keep
the liquid stop valve slightly open.
(c) After the refrigerant is charged, fully open the liquid stop valve and the gas stop valve.
(d) Carefully calculate any additional refrigerant quantity for charging. If the quantity of additional
refrigerant is not correct, it might cause a compressor failure. The additional refrigerant must be
charged in a liquid condition.
(e) Refrigerant charge from the check joint on the gas stop valve can lead to compressor failure.
Be sure to charge refrigerant from the check joint on the liquid stop valve.
Charge the correct refrigerant
quantity according to Table 8.1.
If not, a compressor may be
damaged due to an excess or
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Refrigerant charge from check
joint of gas stop valve may lead
to compressor failure. Be sure
to charge refrigerant from the
check joint of liquid stop valve.
Insulate the liquid piping and
gas piping completely to avoid
decreasing of performance and
dewing on the surface of the
pipe.
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of the piping connection with
insulation.
Check to ensure that there
is no gas leakage. If a large
refrigerant leakage occurs, it will
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harmful gases would occur if a
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Outdoor Unit
Manifold
Gauge
Vacuum Pump
Nitrogen Tank
(for Nitrogen Blow during Brazing
and Airtight Test)
Scale
Indoor Unit
Gas Line
Liquid Line
Multi-Kit Insulation [Cover the gas and liquid pipe with insulation.]
Siphonic Refrigerant Cylinder
(R410A)
Stop Valve (Liquid Line)
Stop Valve (Gas Line)