Filling The Appliance/Heating System; De-Commissioning; Frost Protection; Frost Protection Function - Vaillant ecoCRAFT VKK GB SERIES Operating Manual

4 Operation

4.7.4 Filling the appliance/heating system

The filling pressure must be between 1.0 and 2.0 bar
when the system is cold in order for the heating installa-
tion to operate properly (see Section 4.2.2). If it is less,
have the water topped up by your heating engineer.
If the heating system extends over several storeys, a
higher filling pressure may be required. Ask your engi-
neer for details.
a Caution!
Risk of damage as a result of incorrect filling!
Please ensure that the pressure in the central
heating system is correct at all times. All auto-
matic filling devices should be maintained and
set at the correct pressure. Failure to maintain
the correct operating water pressure and con-
tinually adding fresh water can cause damage
to the boiler and heating system.
Otherwise it could result in damage to seals
and diaphragms as well as noises during heat-
ing operation.
Vaillant assumes no liability for this and such
consequential damages.
4.8

De-commissioning

Fig. 4.12 Switching off the appliance
• To shut down your gas-fired condensing boiler, turn
the main switch (1) to the "0" position.
a Caution!
The frost protection and monitoring systems
are only active if the main switch of the unit is
in the "I" position and the unit is connected to
the power mains.
To ensure that these protection devices remain active,
only switch your gas-fired condensing boiler on and off
in normal mode using the controller (see the corre-
sponding operating manual).
14
Note
h
If the system is to be taken out of service for
longer periods, you should also close the gas
service tap and the cold water shut-off valve.
In this regard, please refer to the instructions
in Section 4.9 concerning frost protection.
Note
The isolator devices are not included in the
scope of delivery for your unit. They are fitted
by your heating engineer on site. He must ex-
plain to you the position and handling of these
components.
4.9

Frost protection

The heating system and water pipes are sufficiently pro-
tected against frost if the heating system remains on
and the rooms are sufficiently heated while you are
away.
Caution!
a
The frost protection and monitoring systems
are only active if the main switch of the unit is
in the "I" position and the unit is connected to
the power mains.
a Caution!
Addition of frost preventative medium to the
heating water in the primary heating circuit is
not permitted. This could affect seals and dia-
phragms and cause noise when the system is in
heating mode. Vaillant assumes no liability for
this and such consequential damages.
4.9.1

Frost protection function

The gas-fired condensing boiler is equipped with a frost
protection system:
1
If the heating flow temperature falls below 5 °C when
the main switch is on, the unit comes into operation
and heats the heat generation circuit to approx. 30 °C.
a Caution!
Danger of freezing of parts installed within the
overall system!
The frost protection system can not guarantee
flow through the entire heating system. Take
note, therefore, of the frost protection function
in the control unit.

4.9.2 Frost prevention by means of draining

Another way to protect the heating system and the ap-
pliance from frost is to drain them. You must ensure
that the system and the appliance are completely
drained.
All the cold and hot water pipes in the house and in the
appliance must also be drained.
Contact your heating engineer.
Operating manual ecoCRAFT 0020058717_03