Honeywell manual Series EC7810A, EC7820A Relay Modules, Features General

7800 SERIES EC7810A, EC7820A Relay Modules

SPECIFICATION DATA

FEATURES

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.

¥Safety features:

ÑInterlock check.

ÑDynamic AMPLI-CHECKª

ÑClosed loop logic test.

ÑDynamic input check.

ÑDynamic safety relay test.

ÑDynamic self-check logic.

ÑExpanded safe-start check.

ÑInternal hardware status monitoring.

ÑLow Fire Start Switch test.

ÑTamper 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)¾with 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:

ÑFlame signal strength.

ÑHold status.

ÑLockout/alarm status.

ÑSequence status.

ÑSequence time.

ÑTotal cycles of operation.

ÑTotal hours of operation.

ÑFault 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.

ÑDiagnostic 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.

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