Re-Installation While The Outdoor Unit Needs To Be Repaired - Bosch BMS500-AAU009-0AHXXA Service Manual

1 4 | Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump

6.7 Re-installation while the outdoor unit needs to be repaired

Evacuation for the whole system
Figure 12
Procedure:
1. Confi rm that both the liquid and gas service valves are set to the opened
position.
2. Connect the vacuum pump to gas service valve's service port.
3. Evacuate for approximately one hour. Confi rm that the refrigerant manifold
low side indicates -0.1Mpa(14.5Psi).
4. Close the valve (Low side) on the charge set, turn off the vacuum pump, and
confi rm that the gauge needle does not move (approximately 5 minutes after
turning off the vacuum pump).
5. Disconnect the charge hose from the vacuum pump.
Data subject to change
Liquid service
valve
Gas service
valve
Refrigerant charging
Figure 13
Procedure:
1. Connect the charge hose to the charging cylinder, open the liquid and the
gas service valve. Connect the charge hose which you disconnected from the
vacuum pump to the valve at the bottom of the cylinder. If the refrigerant is
R410A, make the cylinder bottom up to ensure liquid charge.
2. 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).
3. Put the charging cylinder onto the electronic scale and record the weight.
4. Open the valves (Low side) on the refrigerant manifold and charge the system
with liquid refrigerant If the system cannot be charge with the specifi 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 suffi cient, wait approximately 1 minute and then repeat the
procedure.
5. When the electronic scale displays the proper weight, disconnect the charge
hose from the gas service valve's service port immediately. If the system has
been charged with liquid refrigerant while operating the air conditioner, turn
off the air conditioner before disconnecting the hose.
6. Mount the valve stem caps and the service port. Use torque wrench to tighten
the service port cap to a torque of 18N.m. Be sure to check for gas leakage.
Service Manual
Liquid service
valve
Gas service
valve
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