Frost Protection; Frost Protection Function; Frost Protection By Draining; Maintenance And Customer Service - Vaillant atmoCRAFT VK SERIES Operating Manual

Note!
For longer periods of shut-down (e.g. holiday
periods), the gas stop-cock and the cold water
stop-cock should be switched off.
In this connection, please refer to the
instructions in Chapter 4.10 concerning frost
protection.
Note!
The shut-off valves are not included in the
scope of supply of your unit. They are fitted by
your heating engineer in the installation. The
position and handling of these components
should be described to you.

4.10 Frost protection

The heating system and water pipes are sufficiently
protected against frost if the heating system remains on
and the rooms are sufficiently heated while you are away.
Caution!
The frost protection and monitoring systems
are only active when the main switch of the
appliance is in the "I" position and it is not
disconnected from the mains power supply.
Caution!
Danger of damage to the gas boiler by frost
prevention material.
Addition of frost preventative medium to the
heating water is not permitted. Otherwise it
could result in damage to seals and diaphragms
as well as to noises in the heating operation.
Vaillant assumes no liability for this and such
consequential damages.

4.10.1 Frost protection function

The gas boiler is equipped with a frost protection function:
If the heating feed temperature falls below 5 °C with
the main switch on, the unit starts up and heats the
unit heating circuit to approx. 35 °C.
Caution!
Danger of freezing up of parts of the entire
installation.
The frost protection system cannot guarantee
flow through the entire heating system.
Operating manual atmoCRAFT

4.10.2 Frost protection by draining

Another way to protect the heating system and the
appliance from frost is to drain them. You must ensure
that the system and the appliance are completely drained.
All cold and hot water pipes in the house and the hot
water storage tank connected in the building must also
be drained.
Contact your heating engineer.
4.11

Maintenance and customer service

4.11.1 Inspection and maintenance

Permanent operational readiness, reliability and a long
service life require inspections and maintenance work to
regularly carried out by a heating engineer.
Danger!
Danger of property damage and personal injury
from improper handling!
Never attempt to perform maintenance or
repairs on the gas boiler yourself.
Assign an approved qualified servicing company
with this work. We recommend making a
maintenance agreement.
The operational reliability of the device can be
impaired, resulting in damage to property or
personal injury, if maintenance work is not
carried out.
Regular servicing ensures maximum efficiency and
economical operation of your gas boiler.

4.11.2 Maintenance requirement indicator

The heating engineer can adjust a maintenance
requirement display in your boiler.
If this function is activated, the read-out "SER" appears
in the display on your boiler as soon as maintenance
becomes necessary.
When this display appears you should inform your
heating engineer and he should perform the
maintenance work.
If this function is not activated, and a maintenance
requirement display is not shown, the boiler should be
serviced at least once a year.
Operation 4
GB 15