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• When the electronic scale displays the proper weight
(refer to the table), disconnect the charge hose from
the 3-way valve’s service port immediately and turn
off the air conditioner before disconnecting the hose.
• Mount the valve stem caps and the service port Use
a torque wrench to tighten the service port cap to a
torque of 18N.m (13.27 ft·lbs).
• Be sure to check for gas leaks.
18.2.6. Add Refrigerant after Long-Term
System Operation
• Connect the charge hose to the 3-way service port
and open the 2-way and 3-way valve.
• Connect the charge hose to the valve at the bottom
of the cylinder. If the refrigerant is R410A, place the
cylinder bottom-up to ensure liquid charge.
• Purge the air from the charge hose.
• Open the valve at the bottom of the cylinder and
press the check valve on the charge set to purge the
air (be careful of the liquid refrigerant).
• Place the charging cylinder onto the electronic scale
and record the weight.
• Turn on the air conditioner in cooling mode.
• Open the valves (Low side)on the charge set and
charge the system with liquid refrigerant.
• When the electronic scale displays the proper weight
(refer to the gauge and the pressure of the low
side), disconnect the charge hose from the 3- way
valve’s service port immediately and turn off the air
conditioner before disconnecting the hose.
• Mount the valve stem caps and the service port. Use
torque wrench to tighten the service port cap to a
torque of 18N.m(13.27 ft·lbs).
• Be sure to check for gas leaks.
18.2.7. Servicing Indoor Unit Refrigeration
Circuit
18.2.7.1 Collecting Refrigerant into Outdoor
Unit
• Conrm that both the 2-way and 3-way valves are
set to the opened position
• Remove the valve stem caps and conrm that the
valve stems are in the opened position.
• Be sure to use a hexagonal wrench to operate the
valve stems.
• Connect the charge hose with the push pin of handle
lo to the 3-way valves gas service port.
• Air purging of the charge hose - Open the handle
Lo valve of the manifold valve slightly to purge air
from the charge hose for 5 seconds and then close it
quickly.
• Set the 2-way valve to the close position. 5). Operate
the air conditioner at the cooling cycle and stop it
when the gauge indicates 0.1MPa (14 psi).
• Set the 3-way valve to the closed position
immediately
• Do this quickly so that the gauge ends up indicating
0.3 to 0.5Mpa (43 - 72 psi).
• Disconnect the charge set, and tighten the 2-way
and 3-way valve’s stem nuts.
• Use a torque wrench to tighten the 3-way valves
service port cap to a torque of 18N.m.
• Be sure to check for gas leakage.
18.2.7.2 Air Purging with Vacuum Pump
• Completely tighten the are nuts of the indoor and
outdoor units, conrm that both the 2-way and 3-way
valves are set to the closed position.
• Connect the charge hose with the push pin of handle
lo to the 3-way valves gas service port.
• Connect the charge hose of handle hi connection to
the vacuum pump.
• Fully open the handle Lo of the manifold valve.
• Operate the vacuum pump to evacuate.
• Make evacuation for 30 minutes and check whether
the compound meter indicates - 0.1Mpa (500
microns). If the meter does not indicate - 0.1Mpa
(500 microbars) after pumping 30 minutes, it should
be pumped 20 minutes more. If the pressure can’t
achieve -0.1Mpa (500 microbars) after pumping 50
minutes, please check if there are some leakage
points.
• Fully close the handle Lo valve of the manifold valve
and stop the operation of the vacuum pump. Conrm
that the gauge needle does not move (approximately
5 minutes after turning off the vacuum pump).
• Turn the are nut of the 3-way valves about 45°
counterclockwise for 6 or 7seconds after the gas
coming out, then tighten the are nut again. Make
sure the pressure display in the pressure indicator
is a little higher than the atmosphere pressure. Then
remove the charge hose from the 3 way valve.
• Fully open the 2 way valve and 3 way valve and
securely tighten the cap of the 3 way.
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