28
m
CAUTION
The boiler should be located observing the required
clearances, and provide safe, adequate service ac-
cess.
6.9
Plumbing connections
The plumbing connections have the following characteristics
and dimensions.
175
95
65 65 65 65
=
=
48
400
M
Sc
Sc
U
G
E
R
Fig. 19
Description
Murelle Pro HE MkII
30
35
M - System flow
Ø 22 mm
R - System return
Ø 22 mm
U - Domestic hot water output
Ø 15 mm
E - Domestic hot water inlet
Ø 15 mm
G - Gas cock connection
Ø 15 mm
Sc - Condensate outlet
Ø 21.5 mm
m
CAUTION
A sealed system must only be filled by a competent
person (see section Method of filling a sealed system
page 34).
6.9.1
Plumbing accessories (optional)
To facilitate plumbing and gas connections to the systems, the
accessories as shown in the table below are available and are
to be ordered separately from the boiler.
DESCRIPTION
CODE
Stand off frame (25 mm)
8082212
Valve cover
8094530
NOTE:
kit instructions are supplied with the accessory itself or
are to be found on the packaging.
6.10 Condensate outlet/collection
To ensure safe disposal of the condensate produced by the flue
gases, reference should be made to BS6798:2009.
The boiler incorporates a condensate trap which has a seal of
75 mm, therefore no additional trap is required.
The condensate trap can be filled prior to the installation of the
flue by carefully pouring 1 litre of water into the exhaust con-
nection.
NOTE: All pipework must have a continuous fall from the boiler
and must be resistant to corrosion by condensate, copper or
steel is NOT suitable. It should be noted that the connection of a
condensate pipe to a drain may be subject to local building con-
trol requirements (Dealing with Condensate - see Appendix 1).
6.11 Gas supply
Murelle Pro HE MkII
boilers leave the factory prearranged for
gas G20 (methane) and can also work with G31 (propane) with-
out the need for any type of mechanical conversion.Simply se-
lect parameter
"03"
(see “Parameter setting and display" page
37) and set the type of gas to be used.
If changing the type of gas to be used, carry out the entire ap-
pliance
"COMMISSIONING"
phase (page 36).
The gas connection must be made using seamless steel or cop-
per tube.
Where the piping has to pass through walls, a suitable insulat-
ing sleeve must be provided.
When sizing gas piping, from the meter to the boiler, take into
account both the volume flow rates (consumption) in m3/h and
the relative density of the gas in question.
The sections of the piping making up the system must be such
as to guarantee a supply of gas sufficient to cover the maximum
output available from the boiler, limiting pressure loss between
the gas meter and any apparatus being used to not greater than
1.0 mbar for family II gases (natural gas).
An adhesive data badge is sited inside the front panel; it con-
tains all the technical data identifying the boiler and the type of
gas for which the boiler is arranged.
m
CAUTION
If the gas supply is changed from G20 to G31, mark
the box on the TECHNICAL DATA PLATE.
X
G31 - 36 mbar
