ecoTEC plus 937 installation and maintenance manual
36
5.4.2 Filling device for ecoTEC plus 937
The ecoTEC plus 937 is fitted with a filling loop.
3
1
4
2
Fig. 5.2 Filling device
• Push the double check (
1
) of the filling loop into the
cold water isolation valve (
2
) and secure the double
check valve (
1
) with the spring clip (
4
).
• First open the isolation valve to perform the filling (
3
).
• Open the cold water isolation valve (
2
) so that the
water flows into the heating system. Fill the heating
system as described in Section 5.4.3.
• After filling close both isolation valves and remove the
filling loop by pulling the double check valve (
1
) off the
cold water isolation valve (
2
) (see Fig. 5.2).
h
Note!
Both isolation valves must be closed during the
operation of the heating system and the filling
loop must be removed from the double check
valve again.
1
2
Fig. 5.3 Double check valve separated from the system during
the heating process
5.4.3 Initial filling of the heating system
h
Note!
If the water pressure in the heating system is
too low the display switches between error
message F.22 and the display of the actual
pressure when the unit is switched on.
Fill the heating system as follows:
• Open all thermostatic radiator valves.
• Check that both isolation valves on the combi boiler
are open.
• Connect the filling loop as described in Section 5.4.2.
• Open the water isolation valve.
• Slowly open the isolator valve in the filling loop so that
water can flow into the heating system. Bleed the
radiator at the lowest point until water flows out of the
bleed valve without bubbles.
• Bleed all other radiators until the heating system is
completely filled with water, all bleed valves have been
shut and the manometer pointer is in the centre of the
dark grey area. Bleed the heating pump by loosening
the central screw. Close the filling loop valve and the
cold water isolation valve.
• Loosen the cap on the automatic air vent by a couple
of turns. (In continuous mode the unit is vented
independently by the automatic air vent system.)
• Check all connections and the entire system for leaks.
5 Commissioning, Part I 1
