10
32-00069—01
Components
Automatic butterfly valve
Ratio regulator: varies gas flow to burner in
proportion to air flow.
Automatic shut-off valve (optional).
Manual butterfly valve
Figure 3.6. Packaged Blower
Figure 3.7. Remote Blower with External
Air Butterfly Valve
Figure 3.8. Remote Blower with External Air Butterfly
Valve for Multiple Burner Zones
Step 4: Ignition System
For the ignition system you should use:
• 6000 VAC transformers
• full wave spark transformers
• one transformer per burner
Do not use:
• 10,000 VAC transformers
• twin outlet transformers
• distributor type transformers
• half wave spark transformers
ImmersoJet burners will ignite reliably at any input within
the ignition zone shown in the appropriate burner
datasheet, however, it is recommended that low fire start
be used. Local safety and insurance requirements
demand that you limit the maximum time that a burner
takes to ignite. These time limits vary from country to
country.
The time that a burner takes to ignite depends on:
• the distance between the gas shut-off valve and the
burner
• the air/gas ratio
• the gas flow at start conditions.
In the USA, with a time of 15 seconds to ignition, there
should be sufficient time to ignite the burners. It is
possible, however, to have the low fire too low to ignite
within the time limit. Under these circumstances you must
consider the following options:
• start at higher input levels
• resize and/or relocate the gas controls
Step 5: Flame Monitoring System
A flame monitoring system consists of two main
parts:
• a flame sensor
• flame monitoring control
Flame sensor
There are two types that you can use for an ImmersoJet
burner:
• U.V. scanner
• flame rod
You can find U.V. scanner information in:
• Info Guide 852; 90º U.V. scanner
• Info Guide 854; straight U.V. scanner
• Info Guide 855; Solid State U.V.I.R. scanner
• Info Guide 856; self-check U.V. scanner.
P
1
2
Main Gas
Shut-Off
Valve Train
Loading
Line
P
2
1
4
Main Gas
Shut-Off
Valve Train
Loading
Line
P
1
2
3
4
Main Gas
Shut-Off
Valve Train
to other burners
Loading
Line
