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Copyright © 1998 Honeywell Inc. • All Rights Reserved
SPECIFICATION DATA
7800 SERIES
EC7810A, EC7820A Relay Modules
GENERAL
The Honeywell EC7810/EC7820A Relay Module is a
microprocessor-based integrated burner control for
automatically fired gas, oil or combination fuel single burner
atmospheric (EC7810A) or atmospheric with fan (EC7820A)
applications. The EC7810A/EC7820A system consists of the
relay module, wiring subbase, amplifier and purge card. The
optional keyboard display module (KDM) can be mounted on
the relay module or on the face of a panel door. The KDM can
also be mounted remotely from the panel if this is approved
for the application.
The EC7810/EC7820 is programmed to provide a level of
safety, functional capability and features beyond the capacity
of conventional controls.
The basic functions of the EC7810/EC7820A include
automatic burner sequencing, flame supervision, system
status indication, system or self-diagnostics and
troubleshooting.
FEATURES
• Safety features:
— Interlock check.
— Dynamic AMPLI-CHECK™
— Closed loop logic test.
— Dynamic input check.
— Dynamic safety relay test.
— Dynamic self-check logic.
— Expanded safe-start check.
— Internal hardware status monitoring.
— Low Fire Start Switch test.
— Tamper resistant timing and logic.
• Ignition attempts: 1 or 5. Selectable by model number.
• Access for external electrical voltage checks.
• Application flexibility.
• Dependable, long-term operation provided by microcomputer
technology.
• First-out annunciation and system diagnostics provided by a
2 row by 20 column vacuum fluorescent display (VFD)
located on the KDM (optional).
• Five sequence information light emitting diodes (LED)with
symbols for Power, Pilot, Flame, Main and Alarm (see Fig. 1).
• Interchangeable plug-in flame amplifiers.
• Nonvolatile memory; EC7810/EC7820 retain history files and
sequencing status after loss of power.
• Remote reset (subject to application approval; optional).
• Remote mounting of KDM (subject to application approval).
• Burner control data available on the optional KDM:
— Flame signal strength.
— Hold status.
— Lockout/alarm status.
— Sequence status.
— Sequence time.
— Total cycles of operation.
— Total hours 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 (FFRT).
• Manufacturing code.
• On/off status of all digital inputs and outputs.
• Selected prepurge time.
• Software revision and version of relay module and
optional KDM.
• Status of configuration jumper.
• Status of Run/Test Switch.
66-2040