Honeywell RM7800L User Manual

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The Honeywell RM7800 is a microprocessor based inte-

grated burner control for automatically fired gas, oil, or

combination fuel single burner applications. The RM7800

consists of a Relay Module and Keyboard Display Module.

Subbase, Amplifier, and Purge Card are required to complete

the system. Options include Personal Computer Interface,

DATA CONTROLBUS MODULE™, Remote Display Mount-

ing, First-Out Expanded Annunciator and COMBUSTION

SYSTEM MANAGER™ Software.

The RM7800 is programmed to provide a level of safety,

functional capability and features beyond the capacity of

conventional controls.

Functions provided by the RM7800 include automatic

burner sequencing, flame supervision, system status indica-

tion, system or self-diagnostics and troubleshooting.

7800 SERIES

RM7800E,G,L,M Relay Module

—Expanded annunciator status.

—Total cycles of operation.

—Total hours of operation.

—Fault history of six most recent faults:

• Cycles of operation at time of fault.

• Expanded annunciator data at time of fault.

• Fault message and code.

• Hours of operation at time of fault.

• Sequence status at time of fault.

• Sequence time at time of fault.

—Diagnostic information:

• Device type.

• Flame amplifier type.

• Flame failure response time.

• Manufacturing code.

• On/Off status of all digital inputs and outputs.

• Selected prepurge time.

• Software revision and version of RM7800 and Key-

board Display Module.

• Status of configuration jumpers.

• Status of Run/Test Switch.

■ Safety features:

—Interlock check.

—Closed loop logic test.

—Dynamic AMPLI-CHECK™.

—Dynamic input check.

—Dynamic safety relay test.

—Dynamic self-check logic.

—Expanded safe-start check.

—High Fire Purge Switch test.

—Internal hardware status monitoring.

—Low Fire Start Switch test.

—Tamper resistant timing and logic.

■ Access for external electrical voltage checks.

■ Application flexibility.

■ Communication interface capability.

■ Dependable, long-term operation provided by microcom-

puter technology.

■ First-out annunciation and system diagnostics provided

by a 2 row by 20 column Vacuum Fluorescent Display

(VFD) located on the Keyboard Display Module.

■ First-out expanded annunciation with 26 Light Emitting

Diodes (LEDs) for limits and interlocks (optional).

■ Five sequence information Light Emitting Diodes (LEDs).

■ Five function Run/Test Switch.

■ Interchangeable plug-in flame amplifiers.

■ Local or remote annunciation of operation and fault

information.

■ Nonvolatile memory for retaining history files and se-

quencing status after loss of power.

■ Remote reset (optional).

■ Report generation (optional).

■ Burner controller data:

—Sequence status.

—Sequence time.

—Hold status.

—Lockout/alarm status.

—Flame signal strength.

S. H. • Rev. 9-92 • ©Honeywell Inc. 1992 • Form Number 65-0117—2

CONTENTS

Specifications............................................................ 2

Ordering Information ............................................... 2

Principle Technical Features ................................... 8

Safety Provisions ...................................................... 9

Installation.............................................................. 11

Wiring ..................................................................... 13

Assembly ................................................................. 20

Operation................................................................ 23

Static Checkout ....................................................... 32

Checkout ................................................................. 35

Troubleshooting...................................................... 42

Other manuals for Honeywell RM7800L

Installation Instruction16 pages

Questions and Answers:

S
Scott MurrayAug 7, 2025
How to reset Honeywell RM7800 Control Unit?
- L
  Laura KnoxAug 7, 2025
  To reset the Honeywell RM7800, you can either press the reset pushbutton located on the RM7800 itself, or use a remote reset pushbutton. The remote reset can be wired through the Keyboard Display Module, DATA CONTROLBUS MODULE™, or Remote Reset Module.
F
Frank SmithAug 22, 2025
What to do if Keyboard Display Module VFD is scrambled on Honeywell Control Unit?
- J
  Jacob DaughertyAug 22, 2025
  If the Keyboard Display Module VFD is scrambled, remove and reinstall the Keyboard Display Module. After that, reset the 7800 SERIES Relay Module.

Honeywell RM7800L Specifications

General

Input Voltage	24 VAC
Enclosure Material	Plastic
Application	Heating, Ventilation, and Air Conditioning (HVAC)
Frequency	50/60 Hz
Operating Temperature	0 to 50°C
Humidity Range	0 to 90% RH, non-condensing
Mounting	Wall
Display	LED
Approvals	UL, CE
Dimensions	5.5"
Weight	1.5 lbs
Compatibility	Compatible with various HVAC systems