Baxi 424 Combi 2 - Filling the Installation; Flushing the System; Fill the Installation; Filling the Condensate Trap

6 Installation
42
Combi 2
6.5 Filling the installation
6.5.1 Flushing the system
Flush thoroughly and treat the system according to guidance given in BS
7593.
6.5.3 Filling the condensate trap
1. Check that
the boiler condensate trap has been primed before
commissioning the boiler.
6.6 Draining the installation
Fig.45 Draining
the installation
The drain cock is inside the boiler (in the lower left-hand section). To
access the cock and drain it, proceed as follows:
1. Remove the front panel from the boiler and turn the control panel
downwards, as shown in the adjacent figure.
2. Slowly open the cock (E) anti-clockwise to drain the boiler and the
system. Do not use tools.
3. Close the cock by turning it clockwise, without using excessive force.
E
BO-7746442-3
The temporary filling loop consists of two isolating taps and a separate fill
ing pipe with connection fittings.
Only when repressurising should the filling pipe be connected between the
two taps. Ensure that the nuts on the pipe ends are tightened onto the
taps.
1. Fully open one of the taps first, and then while watching the pres
sure gauge, carefully open the second tap.
Note
The system pressure is shown at all times on the pressure gauge
and can be viewed on the display when there is power to the boiler.
2. When the figures on the display or needle on the pressure gauge
indicate between 1 and 1.5 bar turn both taps off.
3. Disconnect the filling pipe from the taps (a small amount of water
may be present) and remove it. Keep the pipe in a safe place for fu
ture use.
4. If blanking caps are available fit them to the taps.
Note
Go to the "How to videos" section of the "Advice" page at
www.baxi.co.uk for further details.
5. When the correct pressure is restored the boiler will reset automati
cally.
Fig.45 Filling loop
PN-0000260
6.5.2 Filling the system
If the water pressure is too low, the system must be re-pressurised.
The normal operating water pressure is between 1 and 2 bar. If the pres
sure exceeds 3 bar the safety pressure valve will operate and a fault is in
dicated. Ensure that the temporary filling loop is disconnected. Contact
your installer.
It may be necessary to re-pressurise the system occasionally (when the
water pressure falls below 0.7). A filling device (the filling loop) will be
fitted on the system. This will be on the boiler itself, or on pipework near to
the boiler.
A temporary filling loop is supplied.
Fig.44
Water pressure