INSTALLATION INSTRUCTIONS
SIL
3
Capable
APPLICATION
The Honeywell RM7890B, RM7895A Relay Modules are mi-
croprocessor based integrated burner controls for automat-
ically fired gas, oil or combination fuel single burner On/Off
applications. The RM7890B; RM7895A System consists of
the relay module, wiring subbase, amplifier and the RM7895A
also requires a purge timer. Options include Keyboard Display
Module (KDM), Data ControlBus™ Module, remote display
mounting and Modbus communications is available using the
S7810M Modbus Module or configuring the S7800 KDM.
The RM7890; RM7895 is programmed to provide a level of
safety, functional capability and features beyond the capacity
of conventional controls.
This document covers the following models:
RM7890B1063
RM7895A1089
The RM7890, RM7895 provides on/off automatic burner se-
quencing, flame supervision, system status indication, system
or self-diagnostics and troubleshooting. The RM7895 in-
cludes an output for the blower motor to provide purging.
This document provides installation and static checkout in-
structions. Other applicable publications are:
Table 1. Other applicable publications.
Form
number
Description
65-0249
S7810M Modbus Module
65-0084
Q7800A,B 22-Terminal Wiring Subbase Product
Data
65-0090
S7800A 2-line VFD Keyboard Display Module
Product Data.
65-0091
S7810A Data ControlBus Module™ Product Data
65-0095
S7820 Remote Reset Module Product Data
65-0097
221729C Dust Cover Packing Sheet
65-0109
R7824, R7847, R7848, R7849, R7851, R7852,
R7861, R7886 Flame Amplifiers for the 7800
SERIES Product Data
65-0295
NEMA4 covers for 2-line VF KDM, 50023821-
001 w/o reset, 50023821-002 with reset
32-00110 4-line LCD KDM S7800A2142
32-00166 NEMA4 covers for 4-line KDM, 204729A w/o
reset, 204729B with reset
65-0131
221818A Extension Cable Assembly Product
Data
65-0229
7800 SERIES Relay Modules Checkout and
Troubleshooting
CONTENTS
APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
OPTIONAL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
PRINCIPAL TECHNICAL FEATURES . . . . . . . . . . . . . . . . . . . . . . . .6
SAFETY PROVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
INITIATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
STANDBY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
STATIC CHECKOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
CHECKOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
SAFETY AND SECURITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
RM7890, RM7895 100 Vac
7800 SERIES Relay Modules
32-00216-01