Vaillant ecoTEC plus SERIES Instructions For Installation And Servicing - page 38
Instructions for installation and servicing ecoTEC plus / 0020020828_05
38
11 Parts
replacement
The tasks listed below in this section may be carried out
only by a qualified engineer.
• Only use genuine spare parts for repairs.
• Make sure the parts are correctly fitted and that their
original position and alignment are retained.
11.1 Safety
instructions
d
Danger!
Each time the components are replaced, comply
with the safety instructions below for your own
safety and to avoid damage to the appliance!
•
Put the appliance out of operation.
h
Note!
Before starting any maintenance work: Isolate
the mains electricity supply by disconnecting
the plug at the socket outlet (if there is only an
isolating switch remove the fuse from the switch).
• Close the service valve in the gas supply.
• Isolate the boiler flow and return if possible.
• Empty the appliance if you want to replace water
bearing components of the appliance!
• Make sure that no water drops on live components
(e.g. switch box etc.)!
• Use only new seals and O-rings!
• After completing the work, check for gas leaks and
perform a function check (see section 7)!
• Always check earth continuity, polarity and resistance
to earth with a multimeter after any service work and
after exchanging any electrical component.
11.2 Replacing
the
burner.
For access refer to section 8.1.4.
Remove the burner refer to section 8.1.6
11.3
Replacing the gas valve
For access refer to section 8.1.4.
• Remove the gas valve, fan and burner refer to the
relevant parts of section 8.1.6.
• Before removing the gas valve note its position on the fan.
• Remove the three securing screws, which fix the gas
valve, plastic swirl plate to the venturi on the fan.
• Remove the gas valve.
• Remove the gas supply pipe from the gas valve.
• When refitting the gas valve take care as it can be
fitted more than one way.
After assembly test for gas soundness and purge in
accordance with the current issue of BS6891 or in IE, the
current edition of I.S.813 “Domestic Gas Installations”.
11.4 Replacing
the
fan
• Remove the gas valve refer to section 11.3.
• Remove the venturi plate secured with three screws
• Remove the two screws securing the fan to the gas
manifold, see fig 11.1.
gas manifold
securing screw
(2 off)
fan
venturi plate
securing screw (3 off)
gas control
valve
Fig. 11.1 Fan removal
Check the gasket and replace if necessary.
h
Note!
The ecoTEC plus 428 and 438 fan is secured
through an extension piece with two securing
screws, check and replace any seals or gaskets
if necessary.
11.5
Replacing the heat exchanger
flow and return pipes
heat exchanger
securing screws
and clamps (3 off)
Fig. 11.2 Heat exchanger removal
For access refer to section 8.1.4.
• Remove the gas valve, fan and burner refer to the
relevant parts of section 8.1.6.
• Drain the boiler.
11 Parts replacement