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Table Of Contents

SPECIFICATION DATA

66-2027-04

SIL

Capable

7800 SERIES

RM7840E,G,L,M; EC7840L

Relay Module

APPLICATION

The Honeywell RM7840 is a microprocessor based integrated

burner control for automatically fired gas, oil or combination

fuel single burner applications. The RM7840 system consists

of a Relay Module, Subbase, Amplifier and Purge Card.

Options include Keyboard Display Module, Modbus Module™,

DATA CONTROLBUS MODULE™, Remote Display Mounting,

and First-Out Expanded Annunciator.

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 automatic burner

sequencing, flame supervision, system status indication,

system or self-diagnostics and troubleshooting.

RM7840G1022, RM7840L1075, RM7840L1091 and

EC7840L1014 offer Valve Proving Feature.

RM7840L1091 has a 4 second main flame establishing

period.

Using the S7800A1142 Keyboard Display (standard on

RM7800L1087) the following features can be set up:

• Post Purge time—Up to 60 minutes—Device shipped

with 15 seconds Post purge.

• Valve Proving features including:

— VPS test time

— When (Never, Before, After, Split or Both)

FEATURES

• 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.

• 0.8 or 3.0 second Flame Failure Response Time (FFRT),

depending on amplifier selected.

• Communication interface capability using Modbus.

• Dependable, long-term operation provided by

microcomputer technology .

• First-out annunciation and system diagnostics are

provided by an optional 2 row by 20 column Vacuum

Fluorescent 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. See Fig. 1.

• Five function Run/Test Switch.

• Interchangeable plug-in flame amplifiers.

• Local or remote annunciation of RM7840 operation and

fault information (optional).

• Nonvolatile memory RM7840 retains history files and

sequencing status after loss of power.

• Remote reset (optional).

Summary of content (8 pages)

PAGE 1
7800 SERIES RM7840E,G,L,M; EC7840L Relay Module SPECIFICATION DATA • Valve Proving features including: — VPS test time — When (Never, Before, After, Split or Both) FEATURES • 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.
PAGE 2
7800 SERIES RM7840E,G,L,M; EC7840L RELAY MODULE • 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.
PAGE 3
7800 SERIES RM7840E,G,L,M; EC7840L RELAY MODULE Miscellaneous: A7800A1010 7800 SERIES Tester. S7820A1007 Remote Reset Module. S7830A1005 Expanded Annunciator, 120 Vac, 50/60 Hz. 203541 Data ControlBus Connector, 5-wire. 203765 Remote Display Mounting Bracket. 221729 Dust Cover, Relay Module. 50023821-001 Keyboard Display Module Cover, NEMA 4, clear. 204718B Keyboard Display Module Cover, NEMA 1, clear. 50023821-002 Keyboard Display Module Cover, NEMA 4, clear with reset button.
PAGE 4
7800 SERIES RM7840E,G,L,M; EC7840L RELAY MODULE Table 1. Terminal Ratingsc. Terminal No. Description Ratings G Flame Sensor Earth Ground — Earth G Earth Grounda — a L2(N) Line Voltage Common — 3 Alarm 120 Vac, 1A pilot duty. 4 Line Voltage Supply (L1) 120 Vac (+10/-15%), 50 or 60 Hz (±10%) 5 Burner Motor 120 Vac, 9.8 AFL, 58.8 ALR (inrush). 6 Burner Controller and Limits 120 Vac, 1 mA. 7 Lockout/Running Interlock 120 Vac, 8A run, 43A inrush. 8 Pilot Valve/Ignition 120 Vac.
PAGE 5
7800 SERIES RM7840E,G,L,M; EC7840L RELAY MODULE Table 3. Combinations for terminals 8, 9, 10 and 21. Pilot Fuel 8 Main 9 Ignition 10 Valve 2 21 C F No Load No Load B F No Load No Load No Load F No Load B F F A No Load No Load F A F D F A No Load No Load D A D D D A No Load No Load D A D Table 4. Composition of each combination. A. 4.5A Ignition. B. 50 VA Pilot Duty plus 4.5A Ignition. C.
PAGE 6
7800 SERIES RM7840E,G,L,M; EC7840L RELAY MODULE Table 5. Flame Detector System. Plug-In Flame Signal Amplifiers Type Color Rectification Green Self-Checking No Model R7847A Dynamic R7847Bc AMPLI-CHECK™ Infrared Ultraviolet Optical Applicable Flame Detectors Flame Failure Response Time Fuel Type Rectifying Flame Rod Holdersa Models 0.8 or 3 sec. Gas 3 sec. Gas, oil, Ultraviolet (Purple C7012A,Cb coal Peeper) 0.8 or 3 sec. Gas 3 sec.
PAGE 7
800 SERIES RM7840E,G,L,M; EC7840L RELAY MODULE 7 66-2027—04
PAGE 8
7800 SERIES RM7840E,G,L,M; EC7840L RELAY MODULE Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 customer.honeywell.com ® U.S. Registered Trademark © 2013 Honeywell International Inc. 66-2027—04 M.S. Rev.