Unit Reassembly - Aerco Benchmark 2.0 Installation, Operation & Maintenance Instructions Manual

INITIAL START-UP
Combustion Oxygen Level at
45% Valve Position
Oxygen % Carbon
± 0.2 Monoxide
6.0 % <50 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 % Carbon
± 0.2 Monoxide
8.0 % <50 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.
4-8
51. Press the CHANGE key. SET Valve Position
52. Press the ▼ arrow key until the SET Valve
NOx
<30 ppm
53. Press the ▼ arrow key until CAL Voltage
54. Press the CHANGE key. CAL Voltage 20%
55. The oxygen level at the 20% valve position
56. If the oxygen level is not within the specified
57. Once the oxygen level is within the specified
58. This completes the Propane Combustion

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
NOx
service operation.
<30 ppm
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
5. Remove the combustion analyzer probe
6. Replace the unit's side panels and front
will begin to flash.
Position reads 20%, then press the ENTER
key.
16% is displayed.
will begin to flash.
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 % Carbon
± 0.2 Monoxide
8.0 % <50 ppm
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.
range at 20%, press the ENTER key to store
the selected blower output voltage for 20%
valve position.
Calibration procedure.
and reinstall the NPT plug using a suitable
pipe thread compound.
from the vent hole. Replace the NPT plug in
the vent hole using a suitable pipe joint
compound.
door.
NOx
<30 ppm