Worcester GB162-100, Installation And Servicing Instruction

Page: 53 / 96

COMMISSIONING
6 720 648 726 (2011/07) 53
B
Switch off the heating system by pressing the mains
switch of the BC10 basic controller (
Æ
fig. 86, [1]).
B
Close the gas valve (
Æ
fig. 81, page 50).
B
Turn the vent key through a quarter rotation to undo
the boiler door lock (
Æ
fig. 71, see detailed picture,
page 47).
B
Push the fastener down and open the boiler door
(
Æ
fig. 71, page 47).
B
Open the screw plug on the testing nipple for the
burner pressure by 2 turns [1].
B
Set the pressure gauge to "0".
Fig. 87 Checking the gas/air ratio
B
Use a connection tube to connect the positive port of
the pressure gauge to the testing nipple for burner
pressure (
Æ
fig. 87, [2]).
B
Slowly open the gas valve by pushing on the gas valve
and turning it ¼ rotation in an anticlockwise direction
(
Æ
fig. 79, page 49).
B
Switch on the heating system by pressing the mains
switch of the BC10 basic controller (
Æ
fig. 86, [1]).
B
Activate the Service mode in accordance with the
"Service mode" menu (
Æ
table 11, page 43).
B
Set the capacity to minimum (part load) according to
the "Service mode" menu (
Æ
table 11, page 43).
B
After the "Burner" LED (
Æ
fig. 86, [6]) has lit up wait
for one minute until the boiler is burning at part load.
B
Read the differential pressure during service mode.
The differential pressure (p
gas
- p
air
) must be –5 Pa
(±5 Pa) (indication on the pressure gauge: –10 to
0 Pa).
Fig. 88 Gas/air difference at low load
B
Enter the result in the commissioning log book
(
Æ
section 10.5 "Commissioning record log book",
page 59).
B
If the gas/air-ratio is incorrect, it must be adjusted on
the set screw (Torx 40 H) [1].
The set screw is located behind the screw-on cover
(Torx 40 H).
Fig. 89 Gas/air difference at low load
Throughout the measuring operation, keep
the digital pressure gauge in the same
position (horizontal or vertical) in which it
was reset to "0".
GB162-65
GB162-80/100
6 720 648 726-082.1TD
-15 -10 -5 0 5 (Pa)
-0.15 -0.10 -0.05 0.00 0.05 (mbar)
turn anticlockwise turn clockwise
wrong right wrong
6 720 648 726-088.1TD
6 720 648 726-089.1TD
1