Technical data

23
8.0 Installation
8.4 Fitting the Filling Loop
1. The filling loop supplied with the boiler can be connected to
the taps on the wall plate at this point.
2. The filling loop is to be connected between the mains cold
water inlet and central heating return isolation taps.
3. The loop and valves must be connected as shown in the
diagram (Fig. 17a).
4. The two flanged copper elbows supplied are of different
lengths (Fig. 17b). Use pipe ‘A’ to connect to the cold inlet.
Pipe ‘B’ should be used to connect to the central heating
return.
5. Note the orientation of the flow direction arrows on the
stop valve and double check valve.
6. Ensure the brass flange nuts are on each pipe and connect
the plain end of pipe ‘A’ to the stop valve inlet and the plain
end of pipe ‘B’ to the outlet of the check valve using the nuts
and washers supplied.
7. Remove the end caps from the isolation taps and put to
one side. Engage the brass flange nuts to the appropriate
connections on the tap rail or pipework. Ensure that the fibre
washers supplied are used on these joints.
To fill, test and flush if required (Fig. 17c)
8. Take the blanking plugs from the kit, and using washers
supplied with the boiler, connect them to the central heating
flow and return taps, and the cold inlet tap. The system can
now be filled by opening the cold inlet supply and stop valve.
9. If desired a suitable gauge can be connected to one of the
taps so that the system may be accurately pressurised.
10. All joints, fittings and system components can now be
examined for soundness at operating pressure.
11. The system can be flushed by turning off the central
heating tap and connecting a suitable fitting to the loose nut.
From the fitting a hose pipe can be run to the nearest
convenient drain. When the tap is reopened the system will
flush.
12. Remove the blanking plug(s), pressure gauge and flushing
equipment from the appliance if used.
13. Continue with the installation and commissioning.
14. The filling loop must be disconnected and completely
removed after the system is pressurised.
15. Hand tighten the two previously removed end caps to the
stop valve and double check valve.
CH Return
Cold Inlet
Double Check
Valve & Stop Valve
Stop Valve
Temporary Filling
Loop
Pipe ‘A’
Pipe ‘B’
Blanking Plugs
Pressure
Gauge
Hose and
Fitting
Fig. 17a
Fig. 17b
Fig. 17c