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Eclipse ThermJet Design Guide No. 205, 3/5/07
Step 3:
Ignition System
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.)
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