Commissioning; Filling The Brine Loop - Zehnder ComfoFond-L Q ST Série Manuel De L'installateur

5. Commissioning

All loose parts, including cardboard and
packaging materials must be removed from the
ComfoFond-L Q before commissioning.

5.1 Filling the brine loop

During standard operation of the ComfoFond-L Q,
valve V2, ball valve V4 and filling valves V1 and V3
are closed. The ComfoFond-L Q is filled via the filling
valves V1 and V3.
The tap is open when the handle is parallel to the
pipe. The tap is closed when the handle is at a right
angle to the pipe.
16
7
13
V4
9
V1. ¾" filling valve
V2. tap
V3. ¾" filling valve
V4. Ball valve (integrated in the circulation pump
connection)
1. 180 mm Ø air inlet
2. ¾" inlet brine connection
3. pressure meter (integrated in the boiler safety)
4. ¾" outlet brine connection
5. air purge (integrated in the boiler safety group)
6. air filter
EN - 22
3
5
18
19
4
14
6
V2
8
V3 V1
11
10
17
12
15
7. air outlet
ComfoFond-L Q TR: 160 mm Ø side
ComfoFond-L Q ST: 180 mm Ø upper side
8. circulation pump
9. expansion vessel
10. detachable air partition
11. temperature sensor
12. lower drip tray
13. upper drip tray
14. battery
15. condensation drain 1 ¼" with 32 mm adapter
16. temperature sensor and circulation pump
connection
17. internal siphon
18. over-pressure valve (integrated in the boiler
safety group)
19. 1" inner thread boiler safety group connection
All brine loop connections are straight
male-threaded.
Filling instructions
Proceed as follows:
1. Disconnect the Option Box and the ventilation
unit from its power supply.
2. Remove the filter handle from the ComfoFond-L
Q.
3. Release the front panel by removing the 6 screws.
4. Remove the front panel from the ComfoFond-L Q.
5. Check the pre-pressure in the expansion vessel.
In a no-pressure condition, the pressure must be
0.5 bar.
6. Connect the external rinsing pump to filling valve
V3
7. Connect a drainage hose to filling valve V1.
8. Put the other end of the discharge hose in a
container. We recommend a rinsing system with
an open circuit.
9. Open filling valves V1 and V3.
10. Close tap V2.
11. Open the air purge cap.
12. Flush the brine loop until no more bubbles are
2
visible in the collector of the rinsing pump, but at
least 10 minutes.
1
Only fill the system with a ready-made brine
mixture. The correct brine mixture can
be determined using the ComfoFond-L Q
specifications.
13. Close filling valve V1.
14. Open tap V2.
15. Increase the pressure in the device to 1.5 bar. To
that end, use the filling hose connected to filling
valve V3. Use an additional pressure pump if
necessary.
16. Check the system pressure again and add more
in order to increase pressure if necessary.
17. Close fi lling valve V3 and disconnect the fi lling hose.