Honeywell EC7850 A 1122 4 Burner Control

The Honeywell EC7850 A 1122 4 is a versatile and high-reliability burner control unit engineered for advanced combustion management and safety. Designed with a five-function Run/Test switch and interchangeable plug-in flame amplifiers, it ensures precise burner operation and easy maintenance. Suitable for industrial and commercial heating systems requiring stable flame supervision and multiple control interlocks.

Manufacturer: Honeywell
Type: Burner Control
Model: EC7850 A 1122 4

Technical Information

Design: Five-function Run/Test Switch / Interchangeable plug-in flame amplifiers
Maximum Total Connected Load: 2000 VA
Fusing (Total Connected Load): 5 A “ 25 A (MAX. 20 A)
Alarm (Normally Open): AL “ 220/230/240 Vac, 1A, 10A inrush for 5000 cycles
Line Supply Voltage (L1): 220-240 Vac (+10% / -15%), 50/60 Hz (±10%)
FAN “ Burner/Blower Motor: 220/230/240 Vac, 4A at PF = 0.5, 20A inrush
RT “ Limits and Burner Control: 220/230/240 Vac, 5A (maximum)
LD2 “ Airflow Switch Input: 220/230/240 Vac, 1 mA
PV1 “ Pilot Valve 1 (Interrupted): 220/230/240 Vac, 4A at PF = 0.5, 20A inrush
MV “ Main Fuel Valve: 220/230/240 Vac, 4A at PF = 0.5, 20A inrush
IGN “ Ignition: 220/230/240 Vac, 4A at PF = 0.2
F “ Flame Signal: 136 to 220 Vac, current limited
HI “ Firing Rate High Fire: 220/230/240 Vac, 0.5A at PF = 0.5
COM “ Firing Rate Common: 220/230/240 Vac, 0.5A at PF = 0.5
MOD “ Firing Rate Modulate: 220/230/240 Vac, 0.5A at PF = 0.5
LO “ Firing Rate Low Fire: 220/230/240 Vac, 0.5A at PF = 0.5
Control Voltage: 230 Vac (+10% / -15%)
ES2 “ Preignition Interlock Input: 220/230/240 Vac, 1 mA
ES1 “ Low Fire Switch Input: 220/230/240 Vac, 1 mA
ES3 “ High Fire Switch Input: 220/230/240 Vac, 1 mA
LOS “ Lockout Input: 220/230/240 Vac, 1 mA
PV2 “ Pilot Valve 2 (Intermittent): 220/230/240 Vac, 4A at PF = 0.5, 20A inrush
SHTR “ Shutter: Shutter drive for dynamic self-check flame sensor
Operating Temperature: -40 °C to 60 °C
First Safety Time: 3 or 5 sec