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Overview

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

Features

  • Functions include automatic burner sequencing, flame supervision, system status indication, system or self-diagnostics and troubleshooting.
  • Access for external electrical voltage checks.
  • Application flexibility and communication interface capability.
  • Five LEDs provide sequence information.
  • Five function Run/Test Switch.
  • Interchangeable plug-in flame amplifiers.
  • Local or remote annunciation of RM7840 operation and fault information.
  • Nonvolatile memory retains history files and lockout status after loss of power.
  • Compatible with existing Honeywell flame detectors.

Product Specifications

Application
Programming Control
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
Weight (lb)
1 lb 13 oz
Weight (kg)
0.8 kg
Comments
LHL-LF&HF Proven
Frequency
50 Hz; 60 Hz (±10%)
Approvals, Underwriters Laboratories Inc.
Component Recognized, File No. MP268; Guide No. MCCZ.
Approvals, Canadian Standards Association
Certified, File No. LR95329-3.
Voltage
120 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
Approvals, Federal Communications Commission
FCC Part 15, Class B, Emissions.
Flame Establishing Period - Pilot
4 sec or 10 sec
Flame Establishing Period - Main
10 sec or Intermittent
Interlocks
Lockout
Preignition
Yes
PrePurge
Determined by ST7800A Purge Timer Card
PostPurge
15 sec
Early Spark Termination
Yes, 5 sec
Required Components
Q7800A,B Universal Wiring Subbases. R7847, R7848, R7849, R7851, R7852, R7861, or R7886 Flame Signal Amplifier. ST7800A Plug-in Purge Timer Card.
AirFlow Check
User selectable
Second Stage Pilot Valve
Intermittent
Pilot Type
interrupted
Vibration
0.5 G environment
Approvals, Control Safety Devices
Acceptable: CSD-1
Approvals, Swiss RE
Acceptable
Approvals, Factory Mutual
Report No. OX4A5.AF.
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