22
E
.
3
0
.0
7
.0
7
•
G
.
0
7
.0
6
.1
1
27. Gas train KEV25 1" and KEV30 1½"
The air pressure connection nipple must be screwed into the gas jacket at the top.
The blue hose serves as a control line for the gas train and must be routed in a loose loop without kinking.
Cut the blue hose into two sections. Connect the first sections of blue hose to the "p
L
" connection on the
gas train and the air pressure connection on the gas jacket, and connect the other section to the "p
F
" meas-
uring point on the combustion chamber. The hose must be routed in such a fashion that any condensate
forming inside the combustion chamber flows back, and not into the gas train.
Start the burner.
1. Setting the air surplus in high and low-load operation
•
Set the air flap positions P9 for high-load operation and P1 for low-load operation according to
27. Adjustment tables. Follow the setting procedure described in 19. Adjustment mode for pneumatic
gas-fired operation with MPA 22 display.
•
In high-load operation, set the air surplus at the adjustment screw "V" on the gas pressure regulator.
The CO2 level in the flue gas should be 9-10% for natural gas.
•
In low-load operation, set the air surplus with the adjustment screw "N" on the gas pressure regulator.
The CO2 level in the flue gas should be 9-10% for natural gas. The low-load setting influences the
high-load setting.
•
In high-load operation, check the air surplus and, if necessary, correct the setting using the adjustment
screw "V" on the gas pressure regulator.
2. Setting the output in high and low-load operation
•
Check the high-load setting via the gas flow at the gas meter or compare the nozzle pressure with the
values stated in 27. Adjustment tables. The output can be increased by opening the air flap (to
increase P9) and reduced by closing the air flap (to reduce P9). The air surplus is not affected by this
adjustment.
•
Check the low-load setting via the gas flow at the gas meter or compare the nozzle pressure with the
values stated in 27. Adjustment tables. The output can be increased by opening the air flap (increase
P1) and reduced by closing the air flap (reduce P1). The air surplus is not affected by this adjustment.
Installing the gas train
Installation position
only in horizontal line, not tilted.
Minimum distance to walling:
20 mm
Screw the air pressure measuring nipple into the gas jacket at the top.
Route the connecting hose between the air pressure measuring nipple and the gas train in a loose loop.
Gas pressure monitor
Pulse line p
G
pG
V
N
Gas pressure monitor
for leak check
(gas inlet pressure)
