Allied 4DHV Mini-Split Series - Installation Requirements; Refrigerant Charging and Evacuation; Servicing Indoor Unit Refrigeration Circuit

508067-01 Issue 2016 Page 35 of 75
9. 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).
10. Be sure to check for gas leaks.
Servicing Indoor Unit Refrigeration Circuit
Collecting Refrigerant into Outdoor Unit
1. Conrm that both the two-way and three-way valves
are set to the opened position
2. Remove the valve stem caps and conrm that the
valve stems are in the opened position.
3. Be sure to use a hexagonal wrench to operate the
valve stems.
4. Connect the charge hose with the push pin of handle
lo to the three-way valves gas service port.
5. Air purging of the charge hose - Open the handle Lo
valve of the manifold valve slightly to purge air from the
charge hose for ve seconds and then close it quickly.
6. Set the two-way valve to the close position.
7. Operate the air conditioner at the cooling cycle and
stop it when the gauge indicates 0.1MPa (14 psi).
8. Set the three-way valve to the closed position
immediately
9. Do this quickly so that the gauge ends up indicating
0.3 to 0.5Mpa (43 - 72 psi).
10. Disconnect the charge set, and tighten the two-way
and three-way valve’s stem nuts.
11. Use a torque wrench to tighten the three-way valves
service port cap to a torque of 18N.m.
12. Be sure to check for gas leakage.
Air Purging with Vacuum Pump
1. Completely tighten the are nuts of the indoor and
outdoor units, conrm that both the two-way and three-
way valves are set to the closed position.
2. Connect the charge hose with the push pin of handle
lo to the three-way valves gas service port.
3. Connect the charge hose of handle hi connection to
the vacuum pump.
4. Fully open the handle Lo of the manifold valve.
5. Operate the vacuum pump to evacuate.
6. 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.
7. Fully close the handle Lo valve of the manifold valve
and stop the operation of the vacuum pump. Conrm
that the gauge needle does not move (approximately
ve minutes after turning o󰀨 the vacuum pump).
8. Turn the are nut of the three-way valves about 45°
counterclockwise for six or seven seconds 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 three-way valve.
9. Fully open the two-way valve and three-way valve and
securely tighten the cap of the three-way
Evacuation after Servicing the Outdoor Unit
Refrigeration Circuit
Evacuation of the Complete Refrigeration Circuit,
Indoor and Outdoor Unit
1. Conrm that both the two-way and three-way valves
are set to the opened position.
2. Connect the vacuum pump to three-way valve’s
service port.
3. Evacuation for approximately one hour. Conrm that
the compound meter indicates - 0.1Mpa (500 Microns
/ 29.9 in. hg).
4. Close the valve (Low side) on the charge set, turn o󰀨
the vacuum pump, and conrm that the gauge needle
does not move (approximately 5 minutes after turning
o󰀨 the vacuum pump).
5. Disconnect the charge hose from the vacuum pump.
Refrigerant Charging
1. Connect the charge hose to the charging cylinder,
open the two-way valve and the three-way valve.
2. Connect the charge hose which you disconnected
from the vacuum pump to the valve at the bottom of
the cylinder. If the refrigerant is R-410A, make the
cylinder bottom up to ensure liquid charge.
3. Purge the air from the charge hose
4. 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).
5. Put the charging cylinder onto the electronic scale and
record the weight.
6. Open the valves (Low side) on the charge set and
charge the system with liquid refrigerant. If the
system cannot be charge with the specied amount
of refrigerant, or can be charged with a little at a time
(approximately 150g each time) , operating the air
conditioner in the cooling cycle; however, one time is
not su󰀩cient, wait approximately 1 minute and then
repeat the procedure.