Different Pressure Zones; Header Flue Systems; Installation Details; Water Pressure - REMEHA Gas 310 ECO Technical Information

7.3.8 Different pressure zones

fig. 10 Different pressure zones
00.31H.79.00012
The Remeha Gas 310 ECO boilers are capable of oper-
ating with the air inlet and flue outlet in different pres-
sure zones (CLV System).
The max height difference between air inlet and flue gas
outlet is 36 meters and the maximum total length of air
inlet and flue gas outlet pipe work L is shown in table
07.
Flue/ air inlet diameter
Model Gas 310 ECO
maximum total
length of air inlet
m
and flue gas outlet
pipework L
bend 45°, R=D m
bend 90°, R=D m
table 07 Different pressure zones
Note: this system may not be used in areas with
adverse wind conditions (i.e. in some coastal regions).
Note: If the design parameters are outside the values
shown in the above table or there is any doubt over the
flue system, please contact our technical department for
calculation to be undertaken.
62560.indd 18 62560.indd 18
Ñ Flue gas discharge
Ð Combustion air supply
250/ 250 mm
sections
5 6 7 8 9
262
158
98
62
40
2
3.5
Gas 310 ECO

7.3.9 Header flue systems

For multiple boiler installations with common flue sys-
tems please refer to Broag for advice.

7.4 Installation details

7.4.1 Water pressure

The individual boiler sections are each subjected to a
test pressure of 10 bar. On assembly the complete block
is subjected to a factory pressure test using compressed
air at 2 bar for 1 minute.
The boiler is suitable for a maximum working pressure
of 6 bar.

7.4.2 Condensate discharge

Discharge the condensate via a tundish, directly into
a drain. Only use synthetic material for the connecting
pipework because of the acidity (pH 2 - 5) and allow a
min. of 30 mm per meter fall to ensure a good flow rate.
Fill the siphon with clean water before firing the boiler.
It is not advisable to discharge into an outside gutter,
because of the risk of freezing.

7.4.3 Water treatment

The system should be filled with mains cold water (for
the UK this will usually have a pH of between 7 and 8).
Pressurised installations with a boiler/ system content
ratio of 1:10 or less should not require water treatment,
provided that the following conditions apply:
1. The system is flushed thoroughly to remove all fluxes
and debris and filled completely once.
2. Make up water is limited to 5% per annum.
3. The hardness of the water does not exceed 360 ppm
(20°D).
All scale deposits will reduce the efficiency of the boiler
and should be prevented. However provided the above
is complied with any scale produced will not be too det-
rimental to the boiler efficiency and will not reduce the
anticipated life expectancy of the boiler.
NOTE: Scale deposits in excess of 5 mm will reduce
boiler efficiency and increase the risk of premature cast-
ing failure.
As most systems contain a variety of metals it is consid-
ered good practice to provide some form of water treat-
ment (especially in open vented systems) in order to
prevent or reduce the following.
- Metallic corrosion
- Formation of scale and sludge
- Microbiological contamination
- Chemical changes in the untreated system water
Suitable chemicals and their use should be discussed
with a specialist water treatment company prior to car-
rying out any work. The specification of the system and
18
Remeha
18-6-2009 13:14:54 18-6-2009 13:14:54