First Time Installation; Adding The Refrigerant To An Existing System - Bosch Climate 5000 Series Service Manual

Service Manual

5.4 First Time Installation

5.4.1 Air Purging with Vacuum Pump
(Liquid Side)
(Indoor Unit)
(Gas Side)
Manifold Valve
Pressure
Compound Meter
-0.1MPa
Handle Lo
Charge Hose
Charge Hose
Vacuum
Pump
Figure 10
1. Tighten the fl are nuts of the indoor and outdoor units, and confi rm that both
the 2- and 3-way valves are closed.
2. Connect the charge hose with the push pin of Handle Lo to the gas service
port of the 3-way valve.
3. Connect another charge hose to the vacuum pump.
4. Fully open the Handle Lo manifold valve.
5. Using the vacuum pump, evacuate the system for 30 minutes.
a. Check whether the compound meter indicates -0.1 MPa (14.5 Psi).
 If the meter does not indicate -0.1 MPa (14.5 Psi) after 30
minutes, continue evacuating for an additional 20 minutes.
 If the pressure does not achieve -0.1 MPa (14.5 Psi) after 50
minutes, check for leakage.
 If the pressure successfully reaches -0.1 MPa (14.5 Psi),
fully close the Handle Lo valve, then cease vacuum pump
operations.
b. Wait for 5 minutes then check whether the gauge needle moves after
turning off the vacuum pump. If the gauge needle moves backward,
check whether there is gas leakage.
6. Loosen the fl are nut of the 3-way valve for 6 or 7 seconds and then tighten
the fl are nut again.
a. Confi rm the pressure display in the pressure indicator is slightly higher
than the atmospheric pressure.
b. Remove the charge hose from the 3-way valve.
7. Fully open the 2- and 3-way valves and tighten the cap of the 2- and 3-way
valves.
G as 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.
1 4 |
(Outdoor Unit)
Two-way valve
Three-way valve
Gauge
Handle Hi
Bosch Climate 5000 Series Ducted Type (Medium & High Static) Air Conditioner / Heat Pump (11.2022)

5.5 Adding the Refrigerant to an Existing System

Figure 11
Procedure
1. Close both 2- and 3-way valves.
2. Slightly connect the Handle Lo charge hose to the 3-way service port.
3. Connect the charge hose to the valve at the bottom of the cylinder.
4. If the refrigerant is R410A/R32, invert the cylinder to ensure a complete
liquid charge.
5. Open the valve at the bottom of the cylinder for 5 seconds to purge the air in
the charge hose, then fully tighten the charge hose with push pin Handle Lo
to the service port of 3-way valve.
6. Place the charging cylinder onto an electronic scale and record the starting
weight.
7. Fully open the Handle Lo manifold valve, 2- and 3-way valves.
8. Operate the air conditioner in cooling mode to charge the system with liquid
refrigerant.
9. When the electronic scale displays the correct weight (refer to the gauge
and the pressure of the low side to confi rm, the value of pressure refers to
chapter Appendix), turn off the air conditioner, then disconnect the charge
hose from the 3-way service port immediately.
10. Mount the caps of service port and 2- and 3-way valves.
11. Use a torque wrench to tighten the caps to a torque of 18 N.m.
12. Check for gas leakage.
mV
V A
V mA
OFF A
A m A A CO M V