Vaillant ecoMAX 635, Instructions For Installation And Servicing

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3 General requirements
Instructions for installation and servicing ecoMAX
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Fig. 4.4 Removing/Refitting the case
4.8 Gas supply
Fig. 4.5 Fitting the gas connection
• Connect the compression gas service cock and 15 mm
copper outlet tail as supplied with the appliance and
tighten.
• Connect a gas supply pipe of not less than 15 mm dia-
meter to the copper tail.
• Tighten all connections. (Ensure the gas supply pipe-
work is adequately sized such that a 20 mbar gas pres-
sure is available at the boiler inlet at full flow rate).
4.9 Central heating flow and return pipework
Fig. 4.6 Central heating flow and return pipework
Before connecting the heating circuit to the boiler, all
pipework and radiators must be thoroughly flushed to
remove any installation debris.
• Connect the central heating flow and return service
valves to the appliance.
• Connect the 22 mm copper pipe tails to the service
valves as shown in the illustration and tighten the nuts.
• Connect the central heating pipework to the flow and
return tails.
Two additional tubes are supplied with the appliance for
top connection of the flow and return pipework within
the casing.
4.10 Pressure Relief Valve
A pressure relief valve is provided within the boiler card-
board box and should be assembled as shown below.
Connect a discharge pipe not less than 15 mm diameter
to the outlet of this valve.
The discharge pipework should be as short as possible
and installed with a continuous fall away from the boiler.
The pipe should terminate in a position which ensures
that any discharge of water or steam from the valve can-
not create a hazard to persons in or about the premises,
or cause damage to any electrical components or exter-
nal wiring, and the point of discharge should be clearly
visible.
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80020014605_00GB_032006 22.02.2006 21:35 Uhr Seite 14