Vaillant Flue pipe Specifications download pdf (Page 33)

33Instructions for installation and servicing ecoTEC 839592_12

The ecoTEC plus combination boiler will be delivered

with a filling loop.

• Insert the double check valve (1) of the filling pipe at

the cold water shutoff valve and secure the double

check valve with the spring clip (2).

• To fill, first open the stop valve (3).

• Open the stop valve (4), so that water flows into the

heating system. Fill the heating system as described in

Section 5.4.4.

• Close both stop valves after filling and detach the

filling device by pulling the double check valve from

the cold water stop valve.

Note

Both stop valves must be closed while

operating the heating system and the filling

pipe must be again detached at the double

check valve.

Fig. 5.3 Double check valve detached while heating

5.4.3 Filling the heating system in ecoTEC pro com-

bination boilers and ecoTEC plus system boilers

The ecoTEC pro combination boilers and the

ecoTEC plus system boilers do not come with a filling

device. In these appliances, water is filled in the heating

system through a filling pipe provided onsite.

• Join a hose between a cold water dispensing valve

and the filling pipe of the heating system.

• To fill, first open the cold water dispensing valve.

• Open the stop valve on the filling pipe, so that water

flows into the heating system. Fill the heating system

as described in Section 5.4.4.

• After filling, close the stop valve on the filling pipe and

the cold water dispensing valve and remove the filling

hose.

5.4.4 Filling the heating system for the first time

Note

As long as there is insufficient water pressure

in the heating system, the display indicator

changes between the error message F.22 and

the actual pressure indicator when the

appliance is on.

Fill the heating system as follows:

• Open all heating element thermostat valves.

• Check if both stop valves on the heater are open.

• Only in ecoTEC plus combination boilers: Connect the

filling pipe as described in Section 5.4.2.

• Only in ecoTEC plus system boilers and in ecoTEC pro

combination boilers: As described in Section 5.4.3 join

a hose between the cold water dispensing valve and

the filling pipe of the heating system.

• Open the cold water dispensing valve.

• Slowly open the filling valve and let the water flow

into the heating system. Bleed the lowest radiator

until the water flows out at 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 valve and

the cold water dispensing valve.

• Loosen the cap of the pump A.A.V. (automatic air

vent) (the appliance is ventilated independently by the

pump A.A.V. during continuous operation).

• Check all connections and the entire system for leaks.

5.5 Initial system flush (“cold”)

Note

The complete heating system must be flushed

out at least twice: once cold, and once hot as

instructed below.

• Check if all radiator thermostatic valves and both

service valves on the boiler are open.

• Connect a hose to the drain valve located at the

lowest position of the heating system.

• Open the 1/2” BSP drain taps and all vent valves on

the heating elements and allow the water to flow out

of the heating system and the boiler quickly and

completely to remove all installation residue from the

heating system before commissioning the boiler.

• Close the 1/2” BSP drain taps.

• Fill the heating system again with water as described

in Section 5.4.4.

• Check that the pressure relief valve of the heating

system is working by turning the handle on the valve.

• Check the pressure in the heating system and fill

water if needed.

• Close the filling valve and the cold water dispensing

valve.

Commissioning Part I 5

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Vaillant Flue pipe Specifications Page 33

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