PRODUCT DATA
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
65-0203
7800 SERIES
EC7885A/RM7885A Relay Module
APPLICATION
The Yamatake Honeywell EC7885/RM7885 is a microprocessor based
integrated burner control for semi-automatically fired gas, oil or
combination fuel single burner industrial applications. The 7885A
requires a Relay Module Subbase and Amplifier to complete the
system. Options include Keyboard Display Module, Personal Computer
Interface, DATA CONTROLBUS MODULE™, Remote Display Module
and COMBUSTION SYSTEM MANAGER™ Software.
The 7885A is programmed to provide a level of safety, functional capability
and features beyond the capacity of conventional controls.
The 7885A is adaptable to continuous firing, high-low or modulating
firing rate for semi-automatic burner sequencing. Functions
provided by the 7885 include flame supervision, system status
indication, system or self-diagnostics and troubleshooting.
The 7885A operates with any of the following types of ignitions:
1. Torch-ignited main burner using the S445A Start-Stop Station,
or any conventional knee- or foot-operated start-stop station.
2. Torch-ignited pilot using the S445A Start-Stop Station, or any
conventional knee- or foot-operated start-stop station.
3. Direct-ignition oil burner or electrically ignited pilot, using the
S445A Start-Stop Station, which maintains electric ignition as
long as the Start Switch is depressed (up to 15 minutes).
FEATURES
• Safety features:
— Closed loop logic test.
— Dynamic AMPLI-CHECK®.
— Dynamic input check.
— Dynamic safety relay test.
— Dynamic self-check logic.
— Expanded safe-start check.
— Internal hardware status monitoring.
— Tamper resistant timing and logic.
• Lockout if Start Switch is held 15 minutes.
• Access for external electrical voltage checks.
• Application flexibility.
• Communication interface capability.
• 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 optional Keyboard Display Module.
• Five LEDs for sequence information.
• Interchangeable plug-in flame amplifiers.
• Local or remote annunciation of 7885A operation and fault
information (optional).
• Nonvolatile memory; 7885A retains history files and
sequencing status after loss of power.
• Remote reset (optional).
• Report generation (optional).
• Shutter drive output.
• Burner controller data (optional):
— Flame signal strength.
— Hold status.
— Lockout/alarm status.
— Sequence status.
— Sequence time.
— Total hours of operation.
— Total cycles of operation.
— Fault history providing the six most recent faults:
– Cycles of operation 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.
– Software revision and release of 7885A and optional
Keyboard Display Module.
Contents
Application........................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Informationn ......................................................... 2
Principal Technical Features ............................................... 8
Safety Provisions ................................................................ 8
Installation ........................................................................... 9
Assembly............................................................................. 16
Operation ............................................................................ 19
Checkout ............................................................................. 21
Troubleshooting .................................................................. 28
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