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2.3 | Terminal Specifications
This table provides connection details and a brief description of each terminal.
TERMINAL EXPECTED CONNECTIONS INPUT/OUTPUT SAFETY RATED
Main Ion + Connect to main flame rod. Flame Ionization Input Ye s
Ion + For a Dual Rod configuration,
connect to the pilot flame rod.
For a Single Rod configuration,
connect to the Ion+ Terminal
of the coil (red wire).
Flame Ionization Input Ye s
Coil + Connect to the primary
winding of the ignition coil.
(white wire)
Coil Drive Output Ye s
Coil - Connect to the primary
winding of the ignition coil.
(black wire)
Ye s
LEL In + Connect to an external LEL
sensor (4-20 mA or Dry).
12/24 VDC Power Output Ye s
LEL In- Digital / 4-20 mA Input Ye s
Valve + Connect to Pilot Valve
terminal 1.
Powered Output Ye s
Valve - Connect to Pilot Valve terminal
2. Do not connect to ground.
Ye s
EGND Earth Ground Ground N/A
2.4 | Terminal Descriptions
MAIN ION, PILOT ION
Connect each of these inputs to a Kanthal flame rod placed directly in the pilot/main flame. The pilot and
main nozzles must be grounded for the flame detection to function properly. These inputs are protected
from high voltage and can be connected in series with the high voltage terminals of an external ignition
coil, allowing a single flame-rod to be used for both pilot ignition and pilot flame detection. A 65 VAC
signal is applied to the flame rod. The source impedance is very high so there is no danger of sparking
during detection.
COIL
The primary of the ignition coil should be connected to these terminals. A 12 V pulsed DC signal is ap-
plied by the card to the coil. This output is protected by a 250 mA thermal fuse.
LEL IN
This input can be connected to an optional LEL sensor to detect explosive gas concentrations in the burn-
er housing. The input can be configured in software to be disabled, to require an LEL switch, or to require
an LEL 4-20 mA transmitter. The system will not start if the contact is open or the 4-20 mA LEL input is
above the trip point.
