Step 3: Ignition System - Eclipse ThermJet TJ0015 Design Manual

Step 3:
Ignition System
1
For the ignition system use:
• 6,000 VAC transformer
• Full-wave spark transformer
• One transformer per burner
DO NOT USE:
• 10,000 VAC transformer
• Twin outlet transformer
• Distributor type transformer
• Half-wave transformer
It is recommended that low fire start be used, however, Therm-
Jet burners are capable of direct spark ignition anywhere within
the operating range.
Note:
You must follow the control circuits described in the previous
section, "Control Methodology, " to obtain reliable ignition.
Local safety and insurance require limits on the maximum trial
for ignition time. These time limits vary from country to country.
The time it takes for a burner 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
It is possible to have the low fire too low to ignite within the
trial for ignition period. Under these circumstances you must
consider the following options:
• Start at higher input levels.
• Resize and/or relocate the gas controls.
• Use bypass start gas. (See the circuit schematics on the next page.)
Eclipse ThermJet Design Guide No. 205, 3/5/07