Potterton Gas condensing boiler, Installation, Operation And Maintenance Manual

Page: 18 / 136

4.4 Treating and preparing the
heating water
Determining the system volume
The total water volume in the heating system is composed of the system volume
(= fill water volume) plus the top-up water volume. In the POTTERTON boiler-spe-
cific diagrams, only the system volume is given to make them easier to use. Over
the entire service life of the boiler, a maximum top-up volume of twice the system
volume is assumed.
Additives
The following products are currently approved by POTTERTON:
- „Protector CH3 or Alphi-11 Protector“ from Fernox (www.fernox.com)
- „Sentinel X100“ from Sentinel Performance Solutions (www.sentinel-solu-
tions.net)
The specifications of the manufacturer must be followed.
Caution:
If non-approved products are used, the guarantee becomes void.
Antifreeze
Using antifreeze with Potterton gas condensing boilers with aluminium heat ex-
changers
The heat transfer medium (Tyfocor L) offered for solar thermal systems is also used
in heating systems (e.g. holiday houses) as an antifreeze. In the mixture supplied
in the canisters (50 % Tyfocor L, 50 % water). Due to the thermal capacity, which is
lower than that of pure water, and the higher viscosity, boiling noises may occur in
some systems.
For most heating systems, frost protection down to -15 °C is usually sufficient.
Caution: Keep the installation room free of frost.
If antifreeze is used, pipework, radiators and gas condensing boilers are protected
against frost damage. For the gas condensing boiler to be ready for operation at
any time, suitable measures must also be taken to keep the installation room free
of frost. If applicable, please also note special measures for any installed DHW
heaters.
Maintenance instruction
The water hardness of the heating water has to be checked within the scope of the
recommended maintenance of the boiler and, possibly, the respective amount of
additive has to be added.
4.5 Practical notes for the
heating contractor
1. Taking account of the specific system volume (e.g. when using heating water
buffer cylinders), decide which requirements apply with regard to the overall
hardness of the fill and top-up water.
If partial softening to 6 °dH is insufficient an additive should be added.
If a boiler is replaced in an existing system, we recommend installing a dirt sep-
arator or filter in the system return, upstream of the boiler. Flush the system
thoroughly.
2. Depending on the materials used.
Prior to installation
18 Paramount three 30-115 kW 396532 05.11