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Step 4: Ignition System
Ignition Transformer
For the ignition system, use a transformer with:
• secondary voltage 6000 to 8000 VAC
• minimum secondary current 0.02 amp continuous
• full wave output
DO NOT USE the following:
• twin outlet transformer
• distributor type transformer
Trial For Ignition
It is recommended that low fire start be used. However,
under certain circumstances AH-MA DualBlock burners
must be direct spark ignition at higher gas inputs.
Most local safety codes and insurance requirements limit
the maximum trial for ignition time (the time it takes for a
burner to ignite). These requirements vary from one
location to another; check your local codes and comply
with the strictest codes applicable.
The time it takes for a burner to ignite depends on the
following:
• the distance between the gas shut-off valve and the
burner.
• the gas flow conditions at start-up.
The possibility exists where the low fire is too low to ignite
the burner within the maximum trial for ignition time. The
following options must be considered under these
conditions:
• start at higher gas input levels.
• resize and/or relocate the gas controls.
• use spark ignited pilot.
Ignition Gas Piping
AH-MA DualBlock burners are capable of ignition with
either direct spark or spark ignited built-in pilot.
Direct Spark Ignition
This option is available only for of low input burner
models. See Datasheet 163 for more information about
these models.
Figure 3.3 Direct Spark Ignition
Eclipse AH-MA DualBlock Burner, V2, Design Guide 163, 6/19/2012
Main Gas
shut-off
valve train
Spark Ignited Pilot
This type of ignition must be fired at intermediate fire and
for medium to large burners, or if the valve train is at a
distance that does not get enough gas to the burner to
boot.
When ordered, the pilot is packaged with the burner and
includes an adjustable flow gas cock and pressure
regulator.
This option is available for all models in the AH-MA
DualBlock burner series.
Pilot
Figure 3.4 Spark-Ignited Pilot
■ It is not possible to use a continuous or
intermittent pilot. The pilot fuel flow should be
interrupted after the trial ignition period has
expired.
Step 5: Flame Monitoring Control System
The flame monitoring control system consists of two main
components:
• flame sensor
• flame monitoring control
Flame Sensor
Two types can be used on AH-MA DualBlock Burners:
• flame rod
• UV scanner
The UV scanner must be compatible to the flame
monitoring control that is used. Refer to the manual of
your selected control for proper selection of the scanner.
Main Gas
Shut-Off
Valve Train
NC
CAUTION
9
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