Main Heat Exchanger - Vaillant TURBOmax VUW 242 E Instructions For Installation And Servicing

7.7.1 Replacement of main solenoid
valve.
•
Isolate the boiler from the electrical
supply.
•
Remove front casing as in section
7.1.3
•
Lower front control panel as in
section 7.1.6
•
Turn off the gas service valve
(1, fig. 50).
•
Disconnect ignition leads (3, fig. 65)
from rear of control box.
•
Remove three screws (1 + 2, fig. 65)
and control box covers.
•
Disconnect solenoid wires from
main switchboard and appliance
earth strip.
•
Remove two screws (2, fig. 61)
and pull solenoid forward to
remove from gas valve
•
Reassemble in reverse order.
•
Carry out electrical checks (see
section 5.1).and test all gas joints
for soundness
7.7.2 Replacement of modulating
valve
•
Isolate the boiler from the electrical
supply.
•
Remove front casing as in section
7.1.3 .
•
Lower front control panel as in
section 7.1.6
•
Turn off the gas service valve
(1, fig. 50).
•
Remove screw (5, fig. 59) and lift
cover off gas valve.
•
Disconnect modulating coil wires at
the connecting plug provided.
•
Remove modulating valve by
unscrewing wheel adjuster from
gas valve body.
•
Reassemble in reverse order.
•
Set burner pressure in accordance
with instructions supplied with
spare parts.
•
Carry out electrical checks (see
section 5.1).and test all gas joints
for soundness.
Supplied By www.heating spares.co Tel. 0161 620 6677
7.7.3 Replacement of gas operator
•
Isolate boiler from the electrical
supply.
•
Remove front casing as in section
7.1.3.
•
Lower front control panel as in
section 7.1.6.
•
Turn off gas service valve (1, fig.
50).
•
Remove screw (5, fig. 59) and lift
cover off gas valve.
•
Disconnect two wires from gas
operator.
•
Remove screws (1 and 3, fig. 60)
and pull operator forward to
remove.
•
Reassemble in reverse order using
new cork gasket supplied with
spare part.
•
Set burner pressure in accordance
with instructions supplied with
spare part.
•
Carry out electrical checks (see
section 5.1) and test all gas joints
for soundness.
7.8 Replacement of main heat
exchanger
•
Turn off the boiler as in section
7.1.1.
•
Remove front casing as in section
7.1.3 and remove combustion
chamber cover as in section 7.1.5
•
Remove heat exchanger front panel
as in section 7.1.7
•
Release CH water pressure and
drain boiler as in section 7.1.2.
•
Remove burner assembly as in
section 7.4.
•
Pull off wire from NTC (4, fig. 62)
•
Disconnect flow and return
connections (3, fig 62)
•
Slide the heat exchanger forward
to remove.
•
Disconnect flow and return pipes
from the heat exchanger by
rotating at joints (bayonet fix)
•
Reassemble in reverse order.
•
Recommission boiler (see section 5).
fig. 60
fig. 61
fig. 62
37