5
®
Ignition
Type:
On-off relay, de-energize for off.
Maximum Current:
1.9A rms (ignition load) / 4Arms (power factor > 0.6)
Maximum voltage:
250VAC rms
Burner motor, vent, main and pilot valve outputs
Type:
On-off relay, de-energize for off.
Maximum current:
2A rms (pilot duty) / 4A rms (power factor > 0.6)
Maximum voltage:
250VAC rms
Digital Inputs
Pri. Air on & off, Sec. air on & off, oil& gas select, fault, mute, auxiliary 1 to 5.
Type:
Pulsed digital, 0V for off, +5V for on. Output for these digital
contacts must be taken from correct supply terminal as
described in the manual.
Maximum Current:
250 mA approximately (supplied from unit)
Burner Select
Type:
Digital, 0V for off, 90-264VAC for on. Also provides feed for the pilot,
main 1 and main 2.
Maximum Current:
Supplying circuit must be able to provide sufficient current for the pilot,
main valve 1 and main valve 2 simultaneously.
Pressure/temperature Input
0-5V
Maximum Current:
Less than 2 mA
Maximum Voltage:
+/-50V absolute maximum
Accuracy:
+/-1% of full scale
4-20mA
Maximum Current:
+/-50 mA absolute maximum
Burden Resistor:
220R nominal
Accuracy:
+/-1.2% of full scale
Communications Interface
2-wire RS485 plus ground, with termination resistor selected using a link.
See NEX-1501 serial communications protocol manual for details.
External Display Interface
Interface: Fireye
specific
