7800 SERIES RM7840E,G,L,M
Relay Module
■ 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 are pro-
vided by an optional 2 row by 20 column Vacuum Fluores-
cent Display (VFD) located on the Keyboard Display
Module (optional).
■ First-out expanded annunciation with 26 Light Emitting
Diodes (LEDs) for limits and interlocks (optional).
■ Five LEDs for sequence information.
■ Five function Run/Test Switch.
■ Interchangeable plug-in flame amplifiers.
■ Local or remote annunciation of RM7840 operation and
fault information.
■ Nonvolatile memory RM7840 retains history files and
sequencing status after loss of power.
■ Remote reset (optional).
■ Report generation (optional).
■ Burner controller data (optional):
—Expanded annunciator status.
—Flame signal strength.
—Hold status.
—Lockout/alarm status.
—Sequence status.
—Sequence time.
—Total cycles of operation.
—Total hours of operation.
—Fault history, providing for the six most recent
faults:
• Cycles of operation at the time of the fault.
• Expanded annunciator data at the time of the fault.
• Fault message and code.
• Hours of operation at the time of the fault.
• Sequence status at the time of the fault.
• Sequence time at the time of the 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 RM7840 and
optional Keyboard Display Module.
• Status of configuration jumpers.
• Status of Run/Test Switch.
The Honeywell RM7840 is a microprocessor
based integrated burner control for automatically
fired gas, oil, or combination fuel single burner ap-
plications. The RM7840 consists of a Relay Module.
Subbase, Amplifier and Purge Card are required to
complete the system. Options include Keyboard Dis-
play Module, Personal Computer Interface, DATA
CONTROLBUS MODULE
™
, Remote Display
Mounting, First-Out Expanded Annunciator and
COMBUSTION SYSTEM MANAGER
™
software.
The RM7840 is programmed to provide a level of
safety, functional capability and features beyond the
capacity of conventional controls.
Functions provided by the RM7840 include auto-
matic burner sequencing, flame supervision, system
status indication, system or self-diagnostics and
troubleshooting.
CONTENTS
Specifications ................................................2
Ordering Information .................................... 2
Principle Technical Features ........................ 7
Safety Provisions ........................................... 8
Installation .................................................... 9
Wiring.......................................................... 11
Assembly...................................................... 15
Operation .................................................... 18
Static Checkout............................................ 22
Checkout...................................................... 24
Troubleshooting .......................................... 32
S. H. • Rev. 9-92 • ©Honeywell Inc. 1992 • Form Number 65-0087—2
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