Gas Supply; Central Heating Flow And Return Pipework - Vaillant ecoMAX SERIES Instructions For Installation And Servicing

4.9 Gas supply

Fig. 4.6 Fitting the gas connection ecoMAX 800
(picture shows ecoMAX 800)
• 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 pipework is adequately sized
such that a 20 mbar gas pressure is available at the
boiler inlet at full flow rate).
Important note (ecoMAX 835 boiler only):
The gas supply pipe must not be less than 22
mm diameter.
Instructions for installation and servicing ecoMAX
Boiler installation sequence 4

4.10 Central heating flow and return pipework

Fig. 4.7 Central heating flow and return pipework
(picture shows ecoMAX 800)
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.
19 19