INITIAL START-UP
4-4
60
o
F
5.2%
<100ppm
50
o
F
5.6%
<100ppm
40
o
F
6.0%
<100ppm
30
o
F
6.4%
<100ppm
20
o
F
6.8%
<100ppm
10
o
F
7.2%
<100ppm
0
o
F
7.6%
<100ppm
-10
o
F
8.0%
<100ppm
-20
o
F
8.5%
Table 3
15. Change the firing rate to 40%. Allow time for
the combustion analyzer to settle. Check the
measured oxygen reading to insure that it is
still within the range as per Table 1.
16. Continue this procedure until oxygen levels
at 100%, 40% and 20% firing rates are
within the ranges specified in Tables 1,2,
and 3.
Figure 1.4
Iris Air Damper Locking Screws Locatio
n
4.4 UNIT REASSEMBLY
Once combustion calibration is set properly, the
unit can be re-assembled for permanent
operation.
1. Put the green ON/OFF switch in the off
position. Disconnect the AC power supply to
the unit.
2. Shut off the gas supply to the unit.
3. Remove the regulator adjustment tool by
first pulling up the screwdriver blade to
disengage it from the regulator adjusting
screw, and then turning the tool out of the
top of the regulator.
4. Remove the gasket from the tool and place
it back onto the regulator cap.
5. Apply a drop of silicone to the regulator
adjusting screw to lock its setting.
6. Reinstall the cap and gasket back on the
regulator. Tighten the cap using a
screwdriver or wrench.
7. Remove all of the manometers and barbed
fittings and reinstall the pipe plugs using a
suitable thread compound.
8. Replace the unit’s panels.
9. Remove the combustion analyzer probe
from the vent hole. Seal the probe hole and
replace the vent connection cover.
4.5 OVER-TEMPERATURE LIMIT
SWITCH
The Over-temperature limit switch is located on
the front center of the boiler shell. It is a fixed
manual reset switch that will shutdown and lock
out the boiler if the water temperature reaches
210 F. Figure 4.6 shows the location of the over
temperature limit switch.
Figure 4.6
Over Temperature Limit Switch Location
OPEN
BLOWER AIR
DUCT TO AIR
/FUEL VALVE
CLOCKWISE
OUTLET
USE A 1/2" WRENCH TO
INCREASE/DECREASE
AIR INTAKE
Summary of Contents for Benchmark G-00-711
Page 62: ...APPENDIX C ix Temperature Sensor Resistance Chart Balco ...
Page 69: ...APPENDIX F xvi ...
Page 70: ...APPENDIX F xvii ...
Page 71: ...APPENDIX F xviii ...
Page 72: ...APPENDIX F xix ...
Page 73: ...APPENDIX F xx ...
Page 74: ...APPENDIX G xviii ...
Page 75: ...APPENDIX G xix ...
Page 76: ...APPENDIX H xxi ...
