Table of Contents
Advertisement
The Air tube connecting the Venturi
to the fl ue system contains a one-way
valve at the end of the fl exible tube.
It is essential that the two screws
holding it in position are not removed
and are positioned upright (12 o'clock).
This alignment should be checked if
the hose or air system joints are moved
or altered in any way (see fi g 6.3).
G
V
AS
ALVE
NB Coil resistances are 2.8k and 1.6k ohms.
•
Remove the electrical connector.
•
Release the Gascock by undoing the four shoul-
der bolts holding it to the Gas Valve.
•
Remove the Offset tube from the Gas Valve and
unscrew the Offset Connector and transfer to the
new Gas Valve.
•
Release the Gas Valve from the Venturi by
undoing three screws.
•
Transfer the rubber gasket and, if fi tted, Orifi ce to
the new Gas Valve.
•
Replacement is the reverse.
•
Fire the boiler and check for gas leaks.
•
After fi ve minutes check the rate and combustion
is correct to the Datatable. (inside cover). Adjust
using the throttle on the Gas Valve.
C
F
OMBUSTION
AN
•
Remove the two electrical connectors on the Fan.
•
Remove the two screws holding the Venturi to the
Fan, retain the gasket between them.
•
Undo the four nuts and washers holding the Fan
iHE
Air valve
securing screw
S
Fig 6.3
heat exchanger (both
to the Heat Exchanger and withdraw.
•
Transfer the Venturi gasket to the new fan.
•
Replacement is the reverse.
V
ENTURI
•
Remove the Gas Valve, see above.
•
Pull off the Air Tube (Fig 4.1)
•
Undo the two screws holding the Venturi to the
Fan and remove.
•
Ensure the gasket is transferred to the new
Venturi or positioned on the Fan before position-
ing the replacement.
•
Replacement is the reverse.
•
Fire the Boiler and check for gas leaks.
•
After fi ve minutes check the rate and combus-
tion is correct to the Datatable. (inside cover).
Adjust using the Throttle Screw on the
Gas Valve clockwise to decrease CO
clockwise to increase CO
The following components require the
draining of the primary or secondary. It
is essential that all the air is removed
from the Heat Exchanger before the
appliance is fi red. Running the appliance
with air still inside will damage the heat
exchanger and invalidate the warranty.
H
E
EAT
XCHANGER
•
Drain as much of the primary water as is neces-
sary to ensure the heat exchanger is empty.
•
Release both the heat exchanger demountable
connections of the fl ow and return pipes.
•
Lower the pipework away from the heat ex-
changer.
•
Disconnect the gas valve from the supply pipe
using the compression fi tting.
•
Disconnect all electrical connections to the fl ue
sensor, spark generator, both fan connections
and gas valve.
Unscrew to remove burner system (both sets)
Unscrew to remove
sets)
29
, anti-
2
if required. (Fig. 6.2)
2
Fig 6.4
Hide quick links:
Advertisement
Table of Contents
