Venting The Indoor Unit; Adjusting The Operating Pressure Of The Heating System - Bosch Compress 3400i AWS Installation Manual
Indoor unit for air to water heat pump
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6.2
Venting the indoor unit
VW1
Fig. 16 Indoor unit with an integrated electric booster heater and heating system
[Z1]
Heating system (without mixing valve)
[1]
Outdoor unit
[2]
Manual air vent valve
[PC0]
Primary circulation pump
[VC1]
Heating system valves
[VC2]
Drain valve
[VC3]
Valves for the heating system
[VL1]
Automatic air vent valve
[GC1]
Pressure gauge
[SC1]
Magnetic filter valve
[VW1]
3-way diverter valve
[VW2]
Fill valve
See Fig. 16:
1. Connect the power supply to the outdoor and indoor units.
2. Activate "Only auxiliary heater" and make sure that the heating
circulation pump PC1 is running (if installed).
3. Remove the pulse width modulation plug PC0 from the primary
circulation pump PC0 so that it can operate at maximum speed.
4. Deactivate the "Only auxiliary heater" function when no more air is
coming out of the VL1 or the manual air vent valve on top of the
electric heater. Close the manual air vent valve.
5. Connect the PC0 pulse width modulation plug to the heating pump.
6. Clean the particle filter SC1.
7. Also vent via the other air vent valves of the heating system (e.g.
radiators).
8. Check the pressure on the pressure gauge GC1 and top up with the
fill valve VW2 if needed. The pressure should be 0.3–0.7 bar above
the pressure set in the expansion vessel.
9. Check that the heat pump is running and that there are no alarms.
Compress 3400i AWS – 6721852066 (2023/01)
VC1
2
VL1
VC3
GC1
PC0
M
SC1
VW2
T
VC2
T
1
0010035629-001
6.3
Adjusting the operating pressure of the heating
system
Display on the pressure gauge
1.2 bar
Minimum charge pressure. When the system is cold, the
operating pressure must be kept at roughly 0.3–0.7 bar
above the pre-charge pressure of the nitrogen cushion in
the expansion vessel. The pre-charge pressure is 0.7–
3 bar
Maximum charging pressure at maximum heating water
temperature: must not be exceeded (the pressure relief
Table 9 Operating pressure
▶ Top up to 1.5–2.0 bar unless otherwise specified.
▶ If the pressure does not remain constant, check whether the heating
system has any leaks and if the capacity of the expansion vessel for
the heating system is sufficient.
Commissioning
Z1
1.0 bar as a rule.
valve will open).
19
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