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SECTION 3 CAL-IOM-2012-1220 OPERATION
3-7
NOTE: ´ The acceptable combustion range of CO2 is 8.0% to 9.8%. To maintain
NOx < 20%, set combustion to approximately 8.4% CO2. Site -speci c factors may
contribute to the determination of the appropriate combustion range of CO2, and
other combustion parameters.
NOTE: ´ Combustion changes are made at high and low re only, as the gas ratio
valve has a 1:1 ratio.
13. Manually decrease the ring rate by 500 rpm increments observing
combustion down to the low re rpm setting (minimum) on the factory
test re sheet. If required low re combustion may be altered by adjusting
the o set adjustment screw with either a Torx®T40 or a 5mm hex wrench.
NOTE: ´ Turning the screw counterclockwise decreases gas ow, clockwise
increases gas ow.
14. Before leaving the “Firing Rate” screen, tap “Automatic” ring rate control.
Do not leave the unit in the “Manual in Run” mode.
Shut Down Procedures
¡ Normal Shut Off Procedures
1. Place the local/o /remote switch in the o position.
2. Close all manual gas valves.
3. Turn o electrical power.
¡ Emergency Shut Off Procedures
The main gas cock should be closed immediately. If overheating occurs or the gas
supply fails to shut o , do not turn o or disconnect the electrical supply to the
pump. Instead, shut o the gas supply at a location external to the boiler.
¡ Shutting the Boiler Down for an Extended Period of Time
If the boiler is to be shut o for a period greater than 3 months:
1. Perform normal shut down procedure, see above.
2. Isolate water supply and ow circuit from boiler.
3. Drain boiler.
4. Disconnect electrical supply.
¡ Starting Boiler After Prolonged Shutdown
Perform initial start up procedures as described in this manual.
! WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct, and strict
adherence to applicable jurisdictional/
professional codes and regulations.
4 CAUTION
Only factory-trained personnel should
attempt to alter password protected Control
preset values.
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