7800 SERIES Relay Module
The Honeywell RM7838B,C is a microprocessor based
integrated burner control for industrial process modulating
semiautomatically fired gas, oil, coal or combination fuel
single burner applications. The RM7838B,C System consists
of a relay module, wiring subbase, keyboard display module
(KDM), amplifier, and purge card. Options include Data
ControlBus Module™, remote display mounting, and first-out
Functions provided by the RM7838B,C include automatic
modulated High Fire and Low Fire proven Purge, burner pilot
startup with pilot valve hold, a special pilot valve hold from the
Run condition, flame supervision, system status indication,
system or self-diagnostics and troubleshooting.
The RM7838C differs from the RM7838B as follows:
1. Alarms only on Safety Shutdown.
2. Requires ST7800C Purge Timer.
3. C1004 has 15 second MFEP. C1020 has 5 second
This document provides installation and static checkout
instructions. Other applicable publications are:
Q7800A,B 22-Terminal Wiring Subbase
ST7800A,C Plug-In Purge Timer
S7800A Keyboard Display Module
S7830 Expanded Annunciator Product
R7824, R7847, R7848, R7849, R7851,
R7852, R7861, R7886 Flame Amplifiers
for the 7800 Series Product Data.
221818A Extension Cable Assembly
7800 Series Relay Modules Checkout and
Troubleshooting Product Data.
S7810M ModBus™ Module Product Data.
Electrical Ratings (See Table 4):
Voltage and Frequency: 120 Vac (+10/-15%),
50/60 Hz (±10%).
RM7838B,C: 10W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing Total Connected Load: 15A maximum, type SC or
equivalent, fast blow.
Operating: -40°F to +140°F (-40°C to +60°C).
Storage: -40°F to +150°F (-40°C to +66°C).
Humidity: 85% relative humidity continuous, noncondensing.
Vibration: 0.5G environment.
SIL 3 Capable:
SIL 3 Capable in a properly designed Safety Instrumented
System. See form number 65-0312 for Certificate Agree-
Underwriters Laboratories Inc. Listed: File No. MP268, Guide
Canadian Standards Association Certified: LR9S329-3.
Factory Mutual Approved: Report No. 1V9A0.AF.
Swiss Re (formerly Industrial Risk Insurers): Acceptable.
Federal Communications Commission: Part 15, Class B,
Gastec: EN298, Report 115679/4 (RM7838C1020 only)
A Flame Detection System is required for operation
and must be ordered separately. Select the
applicable Flame Signal Amplifier and matching
Flame Detector in form 65-0109.
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
2. Check the ratings given in the instructions and marked
on the product to make sure the product is suitable for
3. Installer must be a trained, experienced, flame
safeguard service technician.
4. After installation is complete, check out the product
operation as provided in these instructions.