Initial System Flush ("Cold"); Filling The Condensate Siphon; Adjusting The Pumping Capacity - Vaillant ecoTEC plus Instructions For Installation And Servicing

> 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")

i
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 low-
est 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 com-
pletely 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.
Instructions for installation and servicing ecoTEC 839592_13
Commissioning Part I
5.6

Filling the condensate siphon

Fig. 5.4 Filling the condensate siphon
a
Danger!
Risk of poisoning caused by escaping
fumes!
If the boiler is run with an empty condensate
trap there is a danger that fumes might
escape into the room and cause poisoning.
> Ensure that the trap is topped up each time
the unit is cleaned.
> Remove the lower part (1) of the condensate siphon
by turning the bayonet catch in anticlockwise direc-
tion.
> Fill the lower part with water until about 10 mm below
the upper edge.
> Refit the lower part of the condensate siphon.
5.7

Adjusting the pumping capacity

Only in ecoTEC plus boilers:
The capacity of the two-stage pump can be adjusted to
the requirements of the heating system. If needed,
change the setting of the operating mode dependent
pump speed under the diagnostic number "d.19" (see
section 8.1.2).
5
1
41