INITIAL START-UP
Combustion Oxygen Level at
45% Valve Position
Oxygen %
± 0.2
Carbon
Monoxide
NOx
6.0 %
<50 ppm
<30 ppm
40. If the oxygen level is not within the specified
range, adjust the level using the
▲
and
▼
arrow keys. This will adjust the output
voltage to the blower motor as indicated on
the display. Pressing the
▲
arrow key
increases the oxygen level and pressing the
▼
arrow key decreases the oxygen level.
41. Once the oxygen level is within the specified
range at 45%, press the
ENTER
key to store
the selected blower output voltage for 45%
valve position.
42. Press the
▲
arrow key until
SET Valve
Position
appears on the C-MORE display.
43. Press the
CHANGE
key.
SET Valve Position
will begin to flash.
44. Press the
▼
arrow key until the
SET Valve
Position
reads
30%
, then press the
ENTER
key.
45. Press the
▼
arrow key until
CAL Voltage
30%
is displayed.
46. Press the
CHANGE
key.
CAL Voltage 30%
will begin to flash.
47. The oxygen level at the 30% valve position
should be as shown below. Also, ensure that
the carbon monoxide (CO) and nitrogen
oxide (NOx) readings do not exceed the
values shown.
Combustion Oxygen Level at
30% Valve Position
Oxygen %
± 0.2
Carbon
Monoxide
NOx
8.0 %
<50 ppm
<30 ppm
48. If the oxygen level is not within the specified
range, adjust the level using the
▲
and
▼
arrow keys. This will adjust the output
voltage to the blower motor as indicated on
the display. Pressing the
▲
arrow key
increases the oxygen level and pressing the
▼
arrow key decreases the oxygen level.
49. Once the oxygen level is within the specified
range at 30%, press the
ENTER
key to store
the selected blower output voltage for 30%
valve position.
50. Press the
▲
arrow key until
SET Valve
Position
appears on the C-MORE display.
51. Press the
CHANGE
key.
SET Valve Position
will begin to flash.
52. Press the
▼
arrow key until the
SET Valve
Position
reads
20%
, then press the
ENTER
key.
53. Press the
▼
arrow key until
CAL Voltage
16%
is displayed.
54. Press the
CHANGE
key.
CAL Voltage 20%
will begin to flash.
55. The oxygen level at the 20% valve position
should be as shown below. Also, ensure that
the carbon monoxide (CO) and nitrogen
oxide (NOx) readings do not exceed the
values shown.
Combustion Oxygen Level at
20% Valve Position
Oxygen %
± 0.2
Carbon
Monoxide
NOx
8.0 %
<50 ppm
<30 ppm
56. If the oxygen level is not within the specified
range, adjust the level using the
▲
and
▼
arrow keys. This will adjust the output
voltage to the blower motor as indicated on
the display. Pressing the
▲
arrow key
increases the oxygen level and pressing the
▼
arrow key decreases the oxygen level.
57. Once the oxygen level is within the specified
range at 20%, press the
ENTER
key to store
the selected blower output voltage for 20%
valve position.
58. This completes the Propane Combustion
Calibration procedure.
4.5 UNIT REASSEMBLY
Once the combustion calibration adjustments in
paragraph 4.3 (natural gas) or 4.4 (propane) are
properly set, the unit can be reassembled for
service operation.
1. Set the ON/OFF switch in the OFF position.
2. Disconnect AC power from the unit.
3. Shut off the gas supply to the unit.
4. Remove the manometer and barbed fittings
and reinstall the NPT plug using a suitable
pipe thread compound.
5. Remove the combustion analyzer probe
from the vent hole. Replace the NPT plug in
the vent hole using a suitable pipe joint
compound.
6. Replace the unit’s side panels and front
door.
4-8
Summary of Contents for Benchmark 2.0
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