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10. Gas Supply
The gas meter and gas supply must be capable of
supplying the quantity of gas for the boiler (see table
below) in addition to the demand from other gas-fired
appliances.
The meter and gas supply must be sized to ensure a
nominal pressure of 20 mbar is available at the
appliance. The gas supply should be checked to
ensure that the gas line is sound and that it has been
installed in accordance with current regulations
relating to gas installations.
Boiler Type
Boiler Gas
Consumption m³/hr
Mital, Mital plus,
Montreux & Montreux
plus
2.8
Mital max &
Montreux max
3.69
10.1 LPG Conversion
Conversion kit :
LPG Kit
Part Used on:
0.75mm GPL Injectors
all
copper washers
all
2 x “GPL” Stickers
all
1 x 0.22 Pilot Injector
Mital & Montreux
1 x Silicon Gasket
plus & max models
5 x Fibre washers
plus & max models
1. Isolate the boiler from the mains electricity
supply.
2.
Loosen the two screws on the control panel and
pull the panel forward.
3. Remove pilot and exchange injector (Mital &
Montreux)
4. Remove the ignition & detection electrodes
(Mital plus, Mital max, Montreux plus &
Montreux max)
5.
Remove the burner (see maintenance section &
figure 23)
6.
Replace the burner injectors
7.
Replace sticker on gas valve and inside of
control panel to show new fuel
8. Re-assemble
boiler
9.
Test all connections disturbed for leaks
10. Adjust high & low gas pressures as per
commissioning instructions and figure 20,21 &
22.
11.
Re-seal test points and check for leaks.
11.0 Cold Water Supply (Mital, Mital plus
& Mital max only)
A minimum pressure of 0.4 bar is required at the
appliance to enable the boiler to function. However a
greater pressure is required if the stipulated flow rate
is to be achieved.
A direct mains water connection is permitted by the
Water Authorities. It is recommended that reference
be made to local requirements.
Where ever possible the cold water supply to the
boiler should be the first connection off the mains
water supply to minimise hot water flow reduction
when other water services are in use.
Within the boiler is a flow valve that must be adjusted
to account for local water pressure conditions and to
provide the temperature desired (see figures 10 &
11).
If the mains inlet water pressure is greater than 6 bar
then a pressure reducing valve must be fitted to the
mains water supply to the boiler.
Figure. - 10 CWS Flow Valve
Figure. - 11 HWS Flow/Temp Graph
12.0 Sealed Primary System
All the Mital & Montreux range of boilers must be
fitted with a bypass if thermostatic radiator valves are
used, alternatively one radiator can be used as a
bypass by fitting it with standard radiator valves to
enable dissipation of heat from the boilers.
Both the Mital & Montreux boiler ranges are supplied
with all the necessary components. The expansion