Vaillant ecoMAX 635, Instructions For Installation And Servicing

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7.2.4 Refitting the compact thermal module
• Renew the silicone gaskets (1) (see Fig 7.3)
• Loosely position the burner, fan and gas valve assemb-
ly in place and reconnect the two electrical connec-
tions to the fan.
• Refit the burner, fan and gas valve assembly. Ensure
that the burner manifold gasket is correctly fitted and
that a good seal is obtained.
• Reconnect the gas supply to the gas valve, ensuring
that a new sealing washer is used and correctly loca-
ted.
• Turn on the gas supply and test for soundness.
• Reconnect the HT lead and earth lead to the spark
electrode.
• Refit the air inlet pipe.
Danger!
The two silicone seals (1 - fig. 7.3) on the com-
pact thermal module ((SP no. 98-1046) must be
replaced each time the module is removed (for
example during maintenance). The burner flange
insulation (2 - fig. 7.3) on the compact thermal
module (SP no. 21-0734) may not show any
signs of damage; otherwise it must also be
replaced.
7.2.5 Cleaning the condensate trap
Fig. 7.6 Cleaning the condensate trap
• Unscrew the bottom section (1) of the condensate trap
(see fig. 7.6).
• Clean the bottom section of the trap by rinsing it out
with water.
• Refill with water to about 10 mm from the top.
• Screw the bottom section back onto the condensate
trap.
Danger!
Note that if the boiler is run with an empty con-
densate trap there is a danger that fumes might
escape into the room and cause poisoning. For
this reason, it is important to ensure that the
trap is topped up each time the unit is cleaned.
7.2.6 Check expansion vessel
Fig. 7.7 Checking expansion vessel admission pressure
Note!
It is not necessary to perform this check every
year – a check every three years is sufficient.
• Ensure the boiler CH service valves are closed.
• Release the pressure from the boiler.
• Remove valve cap from expansion vessel charge point.
• Check that the internal charge pressure of the expan-
sion vessel is between 0.75 and 0.9 bar.
If the pressure is lower than this the vessel should be
repressurised using an air pump.
• Refit the valve cap.
• Repressurise boiler and heating system.
7.3 Recommissioning the boiler
• Carry out electrical safety checks.
• Turn on the electrical supply.
• Open the boiler CH service valves.
• Carry out function checks of boiler operation as pre-
viously detailed.
• Check gas rate as previously detailed.
• Check water soundness.
• Refit case, ensuring that a good seal is obtained.
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7 Servicing
Instructions for installation and servicing ecoMAX
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80020014605_00GB_032006 22.02.2006 21:36 Uhr Seite 30