41
fig. 62
GW 460/0
fig. 63
GW 461/0
7.3 Replacement of air pressure
sensor (fig. 63)
•
Isolate the boiler from the electrical
supply.
•
Remove front casing as in Section
7.1.3.
•
Disconnect plug (3) from air pressu-
re sensor.
•
Pull the front of the air pressure
sensor (1) down to release from
gas valve (2) and remove by
unhooking from rear retaining clip.
•
Replace in reverse order.
•
Carry out electrical checks
(see Section 5.1).
7.4 Replacement of burner
•
Isolate the boiler from the electrical
supply.
•
Remove front casing as in Section
7.1.3.
•
Remove combustion chamber cover
as in Section 7.1.5.
•
Remove the 2 burner retaining
springs (6, fig. 64) by lifting the top
of the spring up and pulling for-
ward.
•
Disconnect the 2 fan electrical
connections (1, fig. 64).
•
Slide the fan inlet restrictor (3,
fig. 64) top the right to separate
from the fan.
•
Remove complete burner and fan
assembly by lifting the burner plate
(2, fig. 64) at the front and pulling
forward to disengage burner from
a spring clip at the rear.
•
Remove burner plate from fan
assembly by removing the 2 bolts
(5, fig. 64).
•
Inspect fan gasket (1, fig. 62) and
replace if worn or broken.
- Reassemble in reverse order.
•
Carry out electrical checks (see
Section 5.1) and check burner
pressure (see Section 5.10) and
gas rate.
fig. 64 (Natural Gas)
GW 422/0
fig. 64a (Propane)
GW 1284/0
