Filling The Heating System (Thermocompact); Initial System Flush (`Cold`) - Vaillant TURBOmax Plus SERIES Instructions For Installation And Servicing

COMMISSIONING PART I
Filling the heating
system
(THERMOcompact)
The boiler and the heating system
should be filled using a filling method
as described on page 16.
Ensure that the boiler CH service
valves are open.
Partially open the filling valve and
allow water to enter the system.
Starting with the lowest radiator,
open the radiator air release until
water (clear of bubbles) is emitted.
Repeat this at all radiators until the
complete system is full, all air locks
have been cleared and the boiler
pressure gauge reads 1.5 bar.
Release any air from the pump by
slackening the centre screw.
The boiler is equipped with an
automatic air release valve. To
allow this to vent the boiler, the
cap on the top must be slackened
by 1 - 2 turns. (This cap must be
left slackened during boiler
operation to ensure any residual
air or system gases are released).
Check the heating system and
boiler connections are sound.
42
Initial system flush
("cold")
The whole of the heating system must
be flushed out at least twice: once
cold, and once hot as instructed later
on page 53.
Open all radiator and heating valves
and the boiler CH service valves and
drain the heating system and boiler
completely from the lowest points of
the system via 1/2" BSP drain taps
(opened full bore to remove any
installation debris prior to lighting the
boiler).
Refill the heating system.
Check the operation of the pressure
relief valve by rotating the knob on
the valve.
Now check the water pressure in the
unit again (and add more water if
necessary).