Air Evacuation; Evacuation Instructions; Note On Adding Refrigerant - Bosch Climate 5000 SCI 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 the gauge reading is still above -0.1 MPa after three hours
of operation check if there is a gas leak or water inside the pipe. If
there is no leakage, perform another evacuation for 1 or 2 hours.
• DO NOT use refrigerant gas to evacuate the system.
9.1

Evacuation Instructions

Before using a 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. 40.
1. Connect the charge hose of the manifold gauge to the service port
on the outdoor unit's low pressure valve.
2. Connect another charge hose from the manifold gauge 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
6. Close the low pressure side of the manifold gauge, 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 the system pressure, unscrew the cap from the
packed valve (high pressure valve). If there is a change in the system
pressure, there may be a gas leak.
8. Insert a 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.
20
Pressure gauge
High pressure valve
Charge hose
Vacuum pump
Pa).
5
Valve body
Valve stem
Fig. 41.
9. Watch the pressure gauge for one minute to ensure that there is no
change in pressure. The pressure gauge should read slightly higher
than atmospheric pressure.
10. Remove the charge hose from the service port.
11. Using a 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 test.
• DO NOT exceed the maximum allowable quantity of refrigerant or
overcharge the system. Doing so can damage or impact the unit's
function.
• 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 refrigerant types.
• For the R32 refrigerant model, make sure the conditions within the
area have been made safe by controlling 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. The
additional refrigerant to be charged can be calculated using the following
formula:
Climate 5000 SCI – 6720887405 (2018/04)
Flare nut
Cap