Air Evacuation; Evacuation Instructions; Note On Adding Refrigerant - Bosch Climate 5000 SCI Series Installation Manual

Air Evacuation

9 Air Evacuation
Safety Precautions
CAUTION
• Use a vacuum pump with a gauge reading lower than -0.1 MPa and
an air discharge capacity above 40 L/min.
• The outdoor unit does not need vacuuming. DO NOT open the
outdoor unit's gas and liquid stop valves.
• Ensure that the compound meter reads -0.1 MPa or below after
2 hours. If after three hours the gauge reading is still above
-0.1 MPa, check if there is a gas leak or water inside the pipe. If
there is no leak, perform another evacuation after 1 or 2 hours.
• DO NOT use refrigerant gas to evacuate the system.
9.1

Evacuation Instructions

Before using manifold gauge and vacuum pump, read their operation
manuals to familiarize yourself with how to use them properly.
Manifold gauge
Compound gauge
-76 cmHg
Low pressure valve
Charge hose
Low pressure valve
Fig. 50.
1. Connect the manifold gauge's charge hose to the service port on the
outdoor unit's low pressure valve.
2. Connect the manifold gauge's charge hose from the service port to
the vacuum pump.
3. Open the low pressure side of the manifold gauge. Keep the high
pressure side closed.
4. Turn on the vacuum pump to evacuate the system.
5. Run the vacuum for at least 15 minutes or until the compound meter
reads -76 cmHG (-1x10 Pa).
5
6. Close the manifold gauge's low pressure valve and turn off the
vacuum pump.
7. Wait for 5 minutes, then check that there has been no change in
system pressure.
NOTE:
If there is no change in system pressure, unscrew the cap from the
packed valve (high pressure valve). If there is a change in system
pressure, there may be a gas leak.
8. Insert hexagonal wrench into the packed valve (high pressure valve)
and open the valve by turning the wrench in a 1/4 counterclockwise
turn. Listen for gas to exit the system, then close the valve after 5
seconds.
22
Pressure gauge
High pressure valve
Charge hose
Vacuum pump
Valve body
Valve stem
Fig. 51.
9. Watch the pressure gauge for one minute to ensure that there
is no change in pressure. It should read slightly higher than the
atmospheric pressure.
10. Remove the charge hose from the service port.
11. Using hexagonal wrench, fully open both the high pressure and low
pressure valves.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal wrench until it hits
against the stopper. DO NOT try to force the valve to open further.
12. Tighten valve caps by hand, then tighten them using the proper
tool.
9.2

Note On Adding Refrigerant

CAUTION
• Refrigerant charging must be performed after wiring, vacuuming,
and the leak testing.
• DO NOT exceed the maximum allowable quantity of refrigerant or
overcharge the system. Doing so can damage the unit or impact its
functioning.
• Charging with unsuitable substances may cause explosions or
accidents. Ensure that the appropriate refrigerant is used.
• Refrigerant containers must be opened slowly. Always use protec-
tive gear when charging the system.
• DO NOT mix refrigerants types.
• For the R32 refrigerant model, make sure the conditions within the
area have been made safe by checking for flammable material when
the refrigerant is added to the air conditioner.
Some systems require additional charging depending on pipe lengths.
The standard pipe length varies according to local regulations:
Climate 5000 SCI – 6720887422 (2019/07)
Flare nut
Cap