Filling The Outdoor Unit, Indoor Unit And Heating; System; Primary Circulation Pump (Pc0); Heating Circuit Pump (Pc1) - Bosch Compress 3400i AWS Installation Manual

5.6.2 Filling the outdoor unit, indoor unit and heating system
Purge the heating system first. If the DHW cylinder is connected to the
system, it must be filled with water and also purged.
Then fill the heating system.
VW1
Fig. 9 Indoor unit with 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. 9:
1. Make sure the power supply to the outdoor and indoor units is not
connected before the system has been completely filled and vented.
2. Activate automatic venting of VL1 by unscrewing the cap a couple of
turns without removing it.
3. Connect a hose to the heating system drain valve VC2.
4. Open the valve VC3, drain valve VC2 and fill valve VW2 to fill the
heating system.
5. Open the manual air vent valve on top of the electric heater until
water discharges without air. Close the valve afterwards.
6. Continue filling until only water comes out of the outlet hose and
bubbles no longer form in the heating system. Where appropriate,
take additional measures to vent the heating system.
7. Close the drain valve VC2.
Compress 3400i AWS – 6721852066 (2023/01)
VC1
2
VL1
VC3
GC1
PC0
M
SC1
VW2
After the system has been filled, vent it thoroughly and clean the water
filter.
▶ Fill the system according to these instructions.
▶ Start the system according to the instructions for the control unit.
▶ Vent the system according to chapter 6.2.
▶ Clean the particle filter as described in chapter 8.1.
T
VC2
T
1
0010035629-001
8. Keep filling until the pressure display GC1 shows 2 bar.
9. If a DHW cylinder is installed, also fill and vent it.
10.Close the fill valve VW2.
11.Remove the hose from VC2.
12. Chapter 6.2.
5.6.3

Primary circulation pump (PC0)

The PC0 circulation pump (integrated into CS3400iAWS 10 E) is
equipped with a PWM control (speed-controlled). The pump settings are
made at the control unit of the indoor unit for the given heating system
( instructions of the control unit).
The pump speed is automatically adjusted for optimum operation.
5.6.4

Heating circuit pump (PC1)

Depending on the configuration of the heating system, a pump is needed
that is selected depending on the flow rate and pressure drop
requirements.
The pump PC1 must always be connected to the installation module of
the indoor unit according to the wiring diagram.
Installation
Z1
13