Commissioning; Filling And Removal Of Air - andrews MAXXflo EVOCWH 120/302 Installation And Maintenance Manual

5.0 COMMISSIONING GENERAL
After installation of pipe work and fi ttings the water systems can then be fi lled and evacuated of all
air before commencing commissioning. This is best done with the door and inner cover removed
(see 4.2 for details)

5.1 FILLING AND REMOVAL OF AIR

5.1.1 DHW TANK AND SYSTEM
In order to ensure safe removal of air from the hot water system, please perform the following:
1. Check that the tank drain shut off valve is closed.
Tank drain shutoff valve
2. If the heater is connected to a hot water recirculation system, open the isolation valve immediately
before the connection point to the tank.
3. Turn on all hot water draw off taps.
4. Turn on the cold water supply and fi ll the DHW tank.
5. Close each hot water draw off tap when water is discharged.
6. After initial fi lling, open each hot water draw off tap in succession and check that all the air is
vented from the system.
7. Check for leaks inside and outside of the heater.
8. Turn on power to heater and operate the Q1 circulation pump by disconnecting the wiring from the
front fl ow sensor (B2) of each heat exchanger. This will automatically operate the pump.
9. Continue to operate the pump(s) until the sound of air in the system has diminished.
10. Replace the fl ow heat exchanger wiring and press the reset for 1s when bleeding is complete.
If the pump does not appear to be rotating, place a cross head screw driver into the hole at the
centre of the pump head. Push screwdriver inwards and turn to free the pump.
Free pump here
CAUTION
It is ESSENTIAL that all air is removed from the heater before proceeding with commissioning the
heat engines , otherwise permanent damage may occur to the heat exchangers and this damage is
not covered by warrantee.

Commissioning

B2 Sensor
39 MAXXfl o EVO