Evacuation And Charging Process; Preparations And Precautions; Evacuation Instructions - Bosch Climate 5000 Series Installation Instructions Manual

9 Evacuation and Charging Process

9.1 Preparations and Precautions

Air and foreign matter in the refrigerant circuit can cause abnormal rises in
pressure, which can damage the air conditioner, reduce its effi ciency, and cause
injury. Use a vacuum pump and manifold gauge to evacuate the refrigerant circuit,
removing any non-condensable gas and moisture from the system.
Evacuation should be performed upon initial installation.
Before performing evacuation
 Check to make sure that both high-pressure and low-pressure pipes
between the indoor and outdoor units are connected properly in
accordance with the Refrigerant Piping Connection section of this manual.
 Check to make sure all wiring is connected properly.
 Perform nitrogen leak check on all refrigerant joints.

9.2 Evacuation Instructions

Before using the manifold gauge and vacuum pump, read their operation manuals
to familiarize yourself with how to use them properly.
Manifold Gauge
Low side gauge
-76cmHg
or -29.92"Hg
Low pressure valve
Refrigerant hose
M2 M1
E²
D²
C²
B²
A²
Figure 23
1. Connect the refrigeration hose from the low side manifold gauge to the
master service valve port (M2), on the outdoor unit.
2. Connect charge hose from the manifold gauge to the vacuum pump.
Bosch Climate 5000 Series Multi Zone Ductless Air Conditioner / Heat Pump (06.2022)
High side gauge
High pressure
valve
Charge hose
Vacuum
pump
E¹
D¹
C¹
M - Master valve
1 - High pressure side
B¹
2 - Low pressure side
A¹
3. Open the low pressure side and high pressure side service valves (A1, B1,
C1, A2, B2, C2, etc.) if the lineset was connected.
4. Open the Low Pressure side valve on the manifold gauge. Keep the High
Pressure side valve closed.
5. Turn on the vacuum pump to evacuate the system.
6. Run the vacuum until the Compound Meter reads -76cmHg / -29.92"Hg
(-101 kPa). It is recommended to use a micron gauge; run the vacuum until
the micron gauge reads 350 to 500 microns or less.
7. After the vacuum process has been achieved, close the Low Pressure side
valve on the manifold gauge, and turn off the vacuum pump.
8. Wait for approximately 10 to 15 minutes, then check that there has been no
change in system vacuum. It is recommended to use a micron gauge; check
to make sure the system is still below 500 microns.
9. If there is a change in system vacuum, refer to Gas Leak Check section
for information on how to check for leaks. If there is no change in system
vacuum, remove the charge hose from the service port.
Flare nut
Valve body
Service valve
Figure 24
10. Using allen wrench, fully open both of the master valves (M1, M2) on the
top.
11. Tighten valve caps on all valves (master valves, high side and low side
services valves) by hand. You may tighten it further using a torque wrench
if needed.
NOTICE: Open valve stems gently
 When opening service valve, turn the allen wrench until it
hits against the stopper. Do not try to force the valve to open
further.
Installation Instructions
Cap
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