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Service Manual
6.5 Adding the refrigerant to an existing system
Figure 10
Procedure
1.
Connect the refrigerant manifold, blue suction hose to the gas service
valve's service port, open the liquid service valve and the gas service valve.
Connect the refrigerant manifold, yellow hose 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 refrigerant manifold, yellow hose. Open the valve at the
bottom of the cylinder and press the check valve on the refrigerant manifold
to purge the air.
CAUTION:
Liquid refrigerant can cause frost bite. Handle with care.
3.
Put the charging cylinder onto the electronic scale and record the weight.
4.
Operate the air conditioner in cooling mode.
5.
Open the valves (low side) on the refrigerant manifold and charge the system
with liquid refrigerant.
6.
When the electronic scale displays the proper weight (refer to the gauge and
the pressure of the low side), turn off the refrigerant low side valve and the
refrigerant cylinder valve. Then turn off the unit to remove the hose from the
gas service valve.
7.
Replace valve stem caps on the service port. Use a torque wrench to tighten
the service port cap to a torque of 18N.m. Be sure to check for gas leakage.
Bosch Thermotechnology Corp. | 02.2018
Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump | 13
Liquid service
valve
Gas service
valve
6.6 Re-installation / indoor unit needs to be repaired
Collecting the refrigerant into the outdoor unit (passive recovery)
Figure 11
Procedure
1.
Remove the valve stem caps and confi rm that both the liquid and gas service
valves are set to the opened position. If not opened, use appropriate hex
wrench to open the valve stems.
2.
Connect refrigerant gauge low side hose (blue) to the gas service valve's
service port
3.
Air purging of the refrigerant manifold, blue hose: Open the low side valve of
manifold slightly to purge air from the hose for 5 seconds and then close it
quickly.
4.
Set the liquid service valve to the close position.
5.
Operate the air conditioner at the cooling cycle and stop it when the gauge
indicates 0.1Mpa(14.5Psi).
6.
Set the gas service valve to the closed position immediately. Do this quickly
so that the gauge ends up indicating 0.3Mpa(43.5Psi) to 0.5 Mpa(72.5Psi).
Disconnect the refrigerant manifold, and tighten the liquid and gas service
valve's stem nuts. Use a torque wrench to tighten the gas service valve's
service port cap to a torque of 18N.m. Be sure to check for gas leakage.
Liquid service
valve
Gas service
valve
Data subject to change
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