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6.2
Expansion vessel
The central heating system must be provided with an expansion vessel. The expansion
vessel which is used should be geared to the water content of the installation. The pre-
charge pressure depends on the installation height above the mounted expansion vessel.
See table 4. Fit the expansion vessel into the return pipe as close as possible to the boiler.
choice of expansion vessel
6.3
Underfloor heating system (plastic pipes)
When connecting or using an underfloor heating system, designed with plastic pipes, or
plastic pipes are used elsewhere in the installation,one should ensure that the plastic
pipes used comply with the DIN 4726/4729 standard. It is set out in this standard that
the pipes may not have oxygen permeability higher than 0.1 g/m³.d at 40°C. If the system
does not comply with this DIN standard, the underfloor heating component will have to
be separated from the central heating appliance by means of a plate exchanger.
No recourse can be made to the terms of the warranty in the event of failure
to observe the regulations pertaining to plastic underfloor heating pipes.
6.4
Gas connection
The appliance pipe is fitted with an internal thread, into which the tail piece of the isolation
valve can be screwed.
United Kingdom:
The gas supply must comply to the current Gas Safety, Installation & Use Regulations.
Ireland:
The connection to the appliance must include a suitable method of disconnection and an
isolation valve must be installed adjacent to the appliance for isolation purposes. The
nominal inlet working gas pressure measured at the appliance should be 20 mbar for Nat
gas (G20).
Make sure that the gas pipe work does not contain dirt, particularly with new
pipes.
When the boiler has to be converted from natural gas to LPG, Rinnai provides special kits
for this purpose. Special instructions are supplied with the kit.
Always check the installation of all of the parts through which gas flows
(using leak detection spray)
installation height above
the expansion vessel
5 m
10 m
15 m
-
Irish standard 813
-
Domestic gas installations
pre-charge pressure
of the expansion vessel
0,5 bar
1,0 bar
1,5 bar
table 4
11
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