Atmos Energy HE26 - Manual (Page 40)

according to the table below:-
Gas type Natural gas H Propane P
Gas category 2H G20 3P G31 (propane)
CO
2
% at low position (L)
(service and -)
8.8 – 9.2 9.3 – 9.7
CO
2
% at high position (H)
(service and +)
8.6 – 9.6 9.5 – 10.5
Gas inlet pressure dynamic (mBar) 17-25 25-45
Gas inlet pressure static (mBar) 20 37
Gas setting ring diameter (mm) 6.95 5.35
Minimum speed (% of max)
(parameter c)
40 40
Min. starting speed (% of max)
(parameter F)
70 50
7.9 Setting gas-air control
Siemens gas valve & ignition transformer
Setting by measuring the CO
2
content of the flue gases
Remark
•
A CO
2
measuring nipple must be mounted right above the
appliance in the flue discharge.
A. Dust cap (socket head wrench torx T15)
B. Setting screw for the low position (socket head wrench torx T15)
C. Off-set pressure measuring nipple
D. Inlet pressure measuring nipple
15. Switch off the appliance using the On/Off button (
- on service
display).
16. Open the flue gas measuring nipple and connect the measuring
hose.
17. Switch on the appliance using the On/Off button.
18. Set the boiler to the lowest output by simultaneously pressing the
“Service” and “–“ buttons on the operating panel until an L
appears on the service display.
19. Measure the CO
2
value. If the CO
2
value does not correspond with
the value in the table, proceed as follows for setting:-
20. Remove the front cover of the appliance.
21. Remove the dust cap (A) with a torx T15 driver
22. Using a torx driver (T15), adjust the setting screw (B) to the correct
CO
2
value (clockwise higher and counter-clockwise lower).
23. After measuring and setting, set the boiler to the highest output by
simultaneously pressing the “Service” and “+“ buttons (twice) on
the operating panel until an
H appears on the service display.
24. Measure the CO
2
value. Check that the CO
2
value corresponds with
the value in the table.
25. If the high output CO
2
is not within the parameters allowed in the
chart above, return to low output and adjust the CO2 setting at low
output before returning to high out put to check it again. Contact the
manufacturer if you encounter difficulties.
26. Measure the CO/CO
2
ratio, (see § 7.10)
27. Exit the test mode by simultaneously pressing the “+” and “–“ buttons on the
operating panel. Replace the dust cap (A) and close the flue gas measuring
nipple.
28. Remount the front cover of the appliance.
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