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CAHA Midi
Installation, Usage and Maintenance Instructions
6.3.4 WATER CONNECTION GENERAL
1.
Water connections for flow and return are size DN100
2. The installation must have a pressure relief valve (with a capacity higher than the boiler output) and an expansion ves-
sel. The capacity of this vessel should be sufficient for the installation.
3. To avoid blocking and non volatile lock-out of the boiler control it is recommended to install a by-pass in the installation
to guarantee the minimum flow through the boiler. The by-pass valve should be mounted as far away from the boiler as
possible to have the biggest possible content of the bypass-circuit (also a big radiator without valves could be used).
4.
Drain the condensate via a tundish and an U-trap to the sewer.
5.
At the highest point of the installation a de-airing device should be mounted.
6.4 GAS CONNECTION
6. The gas connection must be done in accordance with all local and national codes, regulations and standards, and in
accordance with the directives of all relevant authorities.
7.
The gaspipe of the boiler has a R 1,5” connection.
8. In order to avoid blockage of the gas valve, ensure that there is no dirt in the gas pipework prior to commissioning.
9.
The maximum allowable inlet pressure for the gas valve is 50 mbar.
10. Check the heat input of the boiler. The load as given on the type plate should be checked.
6.5 AIR-SUPPLY AND FLUE-GAS CONNECTION
Air connection :
All types have air connection ø 150 mm
Flue gas connection :
ø 250 mm for all types
Allowed Appliance types:
Possibilities for air / flue system ; B23 C33 C63
Note : C63 is not possible for Belgium.
6.5.1 B23
As standard the boiler is delivered as type B23 where the supply air is taken from the room where the boiler has been
installed in.
If the inlet air contains dust or dirt one should install a filter or a leaf catcher in the air supply.
A vertical terminal is recommended
Roof terminals and extensions and/or condensate trap/collector must be approved by RVR Energy Technology. See page
33.
For pressure drop calculation of appliance type B23 use the table for pressure drop per component and the table for total
pressure drop calculation. See page 44.
For total available pressure drop see table on page 42.
6.5.2 C33
A vertical terminal is recommended.
Roof terminals and extensions and/or condensate trap/collector must be approved by RVR Energy Technology. See page
44.
For pressure drop calculation of appliance type C33 use the table for pressure drop per component and the table for total
pressure drop calculation. See page 42. For total available pressure drop see table on page 42.
Terminals should be installed in the same pressure area (within a plane of 1m2)