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On-Off Primary Control


On-Off Primary Control with PrePurge - Interrupted Pilot; 220-240 Vac 50/60 Hz

  • Product Info
  • Literature


Microprocessor-based integrated primary burner control for automatically fired gas, oil, or combination fuel single burner applications. Provides level of safety, functional capability and features beyond conventional controls.


  • Functions include automatic burner sequencing, flame supervision, system status indication, system or self diagnostics and troubleshooting.
  • Subbase, amplifier, and prepurge timer are required for operation.
  • Options include PC interface, keyboard display module, DATA CONTROLBUS™ MODULE, remote display module, first-out expanded annunciator, and COMBUSTION SYSTEM MANAGER™ software.
  • Five LEDs provide sequence information.
  • Interchangeable plug-in flame amplifiers.
  • Optional local or remote annunciation of operation and fault information.
  • Nonvolatile memory retains history files and sequencing status after power loss.
  • Optional remote reset capability.
  • Optional report generation. Selectable relight or lockout on loss of flame.
  • Airflow switch check.

Product Specifications

On-Off Primary Control with Prepurge
Dimensions (in.)
5 in. wide x 5 in. high x 5 1/4 in. deep with Q7800A Subbase x 6 3/32 in. deep with Q7800B Subbase
Dimensions (mm)
127 mm wide x 127 mm high x 133 mm deep with Q7800A Subbase x 155 mm deep with Q7800B Subbase
Used With
7800 Series Amplifiers
Weight (lb)
1 lb 15 oz
Weight (kg)
0.9 kg
60 Hz (±10%),50 Hz
220 to 240 Vac (+10, -15%)
Shipping and Storage Temperature Range (F)
-40 F to +140 F
Shipping and Storage Temperature Range (C)
-40 C to +60 C
Flame Establishing Period - Pilot
4 sec or 10 sec
Flame Establishing Period - Main
10 sec
Determined by ST7800A Purge Timer Card
Required Components
Q7800A,B Universal Wiring Subbases. R7847, R7848, R7849, R7851, R7852, R7861, or R7886 Flame Signal Amplifier. ST7800A Plug-in Purge Timer Card.
Delayed Main Valve
Pilot Type
0.5 G environment
Approvals, Factory Mutual
Report No. 1D0A1.AF