Installation Manual
Bosch Climate 5000 AA Series Inverter Multi Split-Type Ductless Air Conditioner / Heat Pump
| 19
Bosch Thermotechnology Corp.
|
01.2017
Data subject to change
9 Air evacuation
CAUTION:
Use a vacuum pump with a gauge reading lower than
-29.92"Hg.
The outdoor unit does not need to be vacuumed. DO NOT
open the outdoor unit’s gas and liquid stop valves.
Ensure that the Compound Meter reads -29.92"Hg or below
after 2 hours. If after three hours the gauge reading is still
above -29.92"Hg, check if there is a gas leak or water inside
the pipe. If there is no leak, perform another evacuation for 1
or 2 hours.
DO NOT use refrigerant gas to evacuate the system.
9.1 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
Compound gauge
-76cmHg
or -29.92"Hg
Low pressure valve
High pressure
valve
Pressure hose /
Charge hose
Charge hose
Vacuum
pump
Pressure gauge
Low pressure valve
Figure 23
1.
Connect the charge hose of the manifold gauge to 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 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.
6.
Close the Low Pressure side of the manifold gauge, and turn off the vacuum
pump.
7.
Wait for approximately 10 to 15 minutes, then check that there has been no
change in system pressure. It is recommended to use a micron gauge; check
to make sure the system is still below 500 microns.
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 a 5mm allen 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.
Flare nut
Cap
Valve body
Valve stem
Figure 24
9.
Watch the Pressure Gauge for one minute to make sure 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 hexagonal wrench, fully open both the high pressure and low pressure
valves.
NOTICE: Open valve stems gently
When opening valve stems, turn the hexagonal allen wrench
until it hits against the stopper. Do not try to force the valve to
open further.
12.
Tighten valve caps on all three valves (service port, high pressure, low
pressure) by hand. You may tighten it further using a torque wrench if
needed.
13.
If the outdoor unit uses all vacuum valves, and the vacuum position is at
the main valve, the system is not connected with the indoor unit. The valve
must be tightened with a screw nut. Check for gas leaks before operation to
prevent leakage.
