Bosch Climate 7000i Notice D'installation page 73

For the portion of the drain hose that will remain indoors:
▶ Wrap it with foam pipe insulation to prevent condensation.
▶ Remove the air filter and pour a small amount of water into the drain
pan to make sure that water flows from the unit smoothly.
3.6 Checking tightness
Observe the national and local regulations when carrying out the
tightness test.
▶ Remove the caps on the three valves ( Fig. 20, [1], [2] and [3]).
▶ Connect the Schrader opener [6] and pressure gauge [4] to the
Schrader valve [1].
▶ Screw in the Schrader opener and open the Schrader valve [1].
▶ Leave valves [2] and [3] closed and fill the system with nitrogen until
the pressure is 10 % above the maximum operating pressure (
page 8).
▶ Check whether the pressure is still the same after 10 minutes.
▶ Discharge the nitrogen until the maximum operating pressure is
reached.
▶ Check whether the pressure is still the same after at least 1 hour.
▶ Discharge nitrogen.
3.7 Air evacuation
Air and foreign matter in the refrigerant circuit can cause abnormal rises
in pressure, which can damage the air conditioner, reduce its efficiency,
and cause injury.
▶ Use a vacuum pump and manifold gauge to evacuate the refrigerant
circuit, removing any non-condensible gas and moisture from the
system.
Evacuation should be performed upon initial installation and when unit is
relocated. Only proceed with this step after checking the tightness of the
system.
Before performing the evacuation:
▶ Make sure the connective pipes between the indoor and outdoor
units are connected properly.
▶ Make sure all wiring is connected properly.
▶ Connect the charge hose of the manifold gauge to service port on the
outdoor unit's low pressure valve.
▶ Connect another charge hose from the manifold gauge to the vacuum
pump.
▶ Open the low pressure side of the manifold gauge. Keep the High
Pressure side closed.
▶ Turn on the vacuum pump to evacuate the system.
▶ Run the vacuum for at least 15 minutes, or until the compound meter
reads -76 cmHG (-10 Pa).
▶ Close the low pressure side of the manifold gauge, and turn off the
vacuum pump.
▶ Check whether the pressure is still the same after 5 minutes.
▶ If there is a change in system pressure, refer to Chapter 4.1.3 for
information on how to check for leaks.
-or-
▶ If there is no change in system pressure, unscrew the cap from the
packed valve (high pressure valve).
Climate 7000i – 6721873506 (2024/12)
▶ Insert the hexagonal wrench into the packed valve (high pressure
valve) and open the valve by turning the wrench in a 1/4 counter-
clockwise turn. Close the valve after 5 seconds.
▶ Check 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.
▶ Remove the charge hose from the service port.
▶ Using the hexagonal wrench, fully open both the high pressure and
low pressure valves.
▶ Tighten valve caps on all three valves (service port, high pressure,
low pressure) by hand. If needed, use a torque wrench to tighten it
further.
When opening valve stems, turn the hexagonal wrench until it hits
against the stopper. Do not try to force the valve to open further.
3.8 Adding refrigerant
Some systems require additional charging depending on pipe lengths.
The standard pipe length varies according to local regulations.
NOTICE
Malfunction due to incorrect refrigerant
The outdoor unit is filled with R32 refrigerant at the factory.
▶ If refrigerant needs to be topped up, only use the same refrigerant.
Do not mix refrigerant types.
▶ Calculate the additional refrigerant to be charged according to Table
Connective pipe Air purging method
length (m)
≤ Standard pipe Vacuum pump
length
> Standard pipe Vacuum pump
length
Table 9
If refrigerant needs to be topped up, only use the same refrigerant. Do
not mix refrigerant types.
▶ Evacuate and dry system with a vacuum pump ( Fig. 20, [5]) until
the pressure is approx. −1 bar (or approx. 500 microns).
▶ Open the valve at the top [3] (liquid side).
▶ Use a pressure gauge [4] to check whether the flow is unobstructed.
▶ Open valve at bottom [2] (gas side).
The refrigerant is distributed round the system.
▶ Afterwards, check the pressure ratios.
▶ Unscrew the Schrader opener [6] and close the Schrader valve [1].
▶ Remove the vacuum pump, pressure gauge and Schrader opener.
▶ Reattach the valve caps.
▶ Reattach the cover for pipe connections to the outdoor unit.
Installation
Additional
refrigerant
N/A
Liquid Side: Ø 6.35 (ø
0.25")
R32:
(Pipe length –
standard length) x
12g/m
(Pipe length –
standard length) x
0.13oZ/ft
73