Adding The Refrigerant To An Existing System; Re-Installation / Indoor Unit Needs To Be Repaired - Bosch Climate 5000 Series Service Manual

Service Manual
7. Make sure the pressure display in the pressure indicator is a little higher than
the atmospheric pressure. Then remove the charge hose from the gas service
valve.
8. Fully open the liquid service valve and gas service valve and securely tighten
the cap of the gas service valve. System is now evacuated and charged.
(Ensure that the unit is charged per the de ned speci cations shown either
on the name plate of outdoor unit or Engineering Submittal Sheet.).
Gas leak check (Use soap bubble method):
Apply soapy water or a liquid neutral detergent on the indoor unit
connections or outdoor unit connections by a soft brush to check for
leakage of the connecting points of the piping. If bubbles come out, the
pipes are leaking.

4.5 Adding the Refrigerant to an Existing System

(Liquid Side)
(Indoor Unit)
(Gas Side)
Check Valve
Charging
Cylinder
OPEN CLOSE
Electronic Scale
Figure 4
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.
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: CONTAINS REFRIGERANT
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. | 04.2020
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit | 9
(Outdoor Unit)
Liquid Service Line
Gas Service Line

4.6 Re-Installation / Indoor Unit Needs to be Repaired

Collecting the refrigerant into the outdoor unit (passive recovery)
(Liquid Side)
(Indoor Unit)
(Gas Side)
Close
Close
Figure 5
Procedure
1. Remove the valve stem caps and con 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.
(Outdoor Unit)
Liquid Service Line
Gas Service Line
Open
Data subject to change