partial softening of the tap water or addition of hardness stabiliser is re
quired. Softening of the fill and top-up water below 6 ° dH is not allowed!
Example: No addition is required if the system water has a hardness of
12°dH, a volume of up to 600 litres and a gas condensing boiler of up to
50 kW output. The usual refill volume of the system has been taken into
account.
5.2.6 Treating and preparing the heating water
Determining the system volume
The total water volume in the heating system is calculated using the sys
tem volume (= fill water volume) plus the top-up water volume. In the
Potterton Commercial boiler-specific diagrams only the system volume is
given to make them easier to read. Over the entire service life of the boil
er, a maximum top-up volume of twice the system volume is assumed.
Released media
Additives
The following products are currently recommended by Potterton
Commercial:
“Full heating protection” from Fernox (www.fernox.com)
“Sentinel X100” from Guanako (www.sentinel-solutions.net)
Complete desalination
As a general rule, fully desalinated water can always be used, although
a pH value stabiliser is also required. The following products for produc
ing fully desalinated water have been tested and approved:
“Complete desalination cartridge SureFill” from Sentinel (www.senti
nel-solutions.net)
Partial softening
It must be ensured with an automatic blending device that the min. hard
ness is not less than 6°dH .
See
The specifications of the manufacturer must be followed.
Caution
If non-approved products are used, the guarantee becomes void.
Antifreeze agent
Note
The use of antifreeze agents with Potterton Commercial gas con
densing boilers with aluminium heat exchangers.
The heat transfer medium WTF B (accessory) offered for solar thermal
systems is also used in heating systems (e.g. holiday houses) as an anti
freeze agent. In the mixture supplied in the canisters (42 % WTF B, 58 %
water) the freezing point ("crystal formation point") is -28 °C. 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 -28 °C is not required;
-15 °C is usually sufficient. The heat transfer medium must be diluted 2:1
with water to set this operating point. This mixing ratio has been tested by
Potterton Commercial in relation to its practical suitability for use with gas
condensing boilers.
Note
Up to a mixing ratio of 2.5:1 the heat transfer medium WTF B is
approved as an antifreeze agent down to -15 °C for use with
Potterton Commercial gas condensing boilers.
5 Before installation
7658013 - 02 - 15092016
Paramount four 30 – 115 kW
31