range suitable for the use encountered.
2.15.3.3
Combustion Chamber Temperature Controller
The combustion temperature control shall [record the combustion chamber
temperature] [and] [maintain the temperature between the adjustable high
temperature and low temperature set points]. The controller shall control
the [damper actuator motors] [blowers]. Control logic shall include auto
position signal and automatic switch over capabilities.
a. The system shall shut down and not attempt to restart if the
temperature exceeds the allowable combustion chamber temperature range.
A high temperature shutdown shall activate the high temperature alarm.
b. During operation, the system shall shut down and not attempt to
restart if the temperature falls below the allowable combustion chamber
temperature range. During the ignition cycle, if the temperature does
not reach or exceed the low temperature shutdown setting, the system
shall shut down and not attempt to restart. A low temperature shutdown
during operation or during the ignition cycle shall activate the low
temperature alarm.
2.15.3.4
Primary Combustion Air Control
**************************************************************************
NOTE: For this and the following paragraph, refer
to Section 11215A FANS/BLOWERS/PUMPS; OFF-GAS for
combustion air control.
**************************************************************************
Fully adjustable air dampers on each burner shall be furnished with remote
operation by external lever control, sized to provide a minimum of [100]
[115] percent of theoretical stoichiometric air as primary air. Dampers
shall allow the operator to adjust the primary air/fuel ratio while burner
is in operation.
2.15.3.5
Total Combustion Air Control
[Motor operated louver dampers shall be provided. Actuators shall cause
louvers to fail open on loss of signal or power.] [Two multistage
centrifugal blower trains, each with a suction valve, discharge valve, and
discharge check valve shall be provided.]
2.15.3.6
Quenching/Dilution Air Control
Motor operated louver dampers shall be provided.
Actuators shall cause
louvers to fail open on loss of signal or power.
2.16
FLOW METERS, TRANSMITTERS AND FLOW CONTROLLER
The flow control system shall include an automatically actuated main fuel
valve with fail-closed feature and limit switches for position indication.
The flow rate metering system shall include recording, totaling and alarm
capabilities.
2.16.1
Off-Gas Flow Meter
Flow metering for the off-gas shall conform to AGA Report No 3.
SECTION 11378
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