Honeywell Honeywell Thermostat RM7840G User's Manual

Honeywell Thermostats User's Manual - Honeywell Thermostat RM7840G.
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INSTALLATION INSTRUCTIONS

66- 1085- 3

® U.S. Registered Trademark
Copyright © 2002 Honeywell •  All Rights Reserved 

RM7800E,G,L,M; RM7840E,G,L,M

7800 SERIES Relay Modules

APPLICATION

The Honeywell RM7800/RM7840 Relay Modules are 
microprocessor-based integrated burner controls for 
automatically fired gas, oil, or combination fuel single burner 
applications. The RM7800/RM7840 Relay Modules are used 
for UL/CSA On/Off, UL/CSA Modulating, and FM/IRI 
Modulating burner applications. The RM7800/RM7840 system 
consists of a Relay Module. Keyboard Display Modules 
(standard with RM7800), Dust Cover (standard with RM7840), 
Subbase, Amplifier, and Purge Card. Options include 
Personal Computer Interface, DATA CONTROLBUS 
MODULE™, Remote Display Mounting, First-Out Expanded 
Annunciator and Combustion System Manager™ Software. 

Functions provided by the RM7800/RM7840 include 
automatic burner sequencing, flame supervision, system 
status indication, system or self-diagnostics and 
troubleshooting. The RM7800/RM7840 is a solid state 
replacement for the electromechanical R4140 Automatic 
Programming Control.

This document provides installation and static checkout 
instructions. Other applicable publications are:

65-0084:Q7800A,B 22-Terminal Wiring Subbase Product 

Data.

65-0089:ST7800A Plug-In Purge Timer Installation 

Instructions.

65-0090:S7800A 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.
65-0101:S7830 Expanded Annunciator Product Data.
65-0109:R7824, R7847, R7848, R7849, R7851, R7861, 

R7886 Flame Amplifiers for the 7800 SERIES Product 
Data.

65-0131:221818A Extension Cable Assembly Product 

Data.

65-0228:7800 SERIES Multi-Drop Switch Module Product 

Data.

65-0229:7800 SERIES RELAY MODULES Checkout and 

Troubleshooting Product Data.

65-0249:S7810M ModBus™ Module Product Data.

SPECIFICATIONS

Electrical Ratings, see Table 3:
Voltage and Frequency: 120 Vac (+10/-15%), 50 or 60 Hz 

(±10%).

Power Dissipation: RM7800/RM7840: 10W maximum.

Maximum Total Connected Load: 2000 VA.

Fusing: 15A maximum, Type SC or equivalent Fast Blow.

Environmental Ratings:
Ambient Temperature:

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.

Approvals:
Underwriters Laboratories Inc. Listed: File No. MP268, 

Guide No. MCCZ.

Canadian Standards Association Certified: LR9S329-3.
Factory Mutual Approved: Report No. J.I.1V9A0.AF. 
IRI Acceptable.
Federal Communications Commission, Part 15, 

Class B—Emissions.

INSTALLATION

When Installing this Product...

1.

Read these instructions carefully. Failure to follow 
them could damage the product or cause a hazardous 
condition.

2.

Check the ratings given in the instructions and marked 
on the product to make sure the product is suitable for 
the application.

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.

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