Settings And Adjustments - Honeywell 7800 Series Installation Instructions Manual

Relay modules

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Table Of Contents

Table of Contents

7800 SERIES RELAY MODULES

4. The alarm, terminal 3, is de-energized during RUN

and energized when shutdown occurs.

Keyboard Display Module (KDM)

The Keyboard Display Module (see Fig. 3) is provided with

the RM7838A Relay Module. The first line of the Vacuum

Fluorescent Display (VFD) provides:

1. Current status of the burner sequence (STANDBY,

PURGE, PILOT IGN, MAIN IGN and RUN).

2. Timing information (PURGE, PILOT IGN, and MAIN

IGN) in minutes and seconds.

3. Hold information (PURGE HOLD:T19).

4. Lockout information (Lockout, Fault Code, Message

and Sequence).

The extreme right side of the first line is either blank or

shows a small arrow pointing to the second line followed

by a two-letter code (DI, Diagnostic Information; Hn, Fault

History Information; EA, Expanded Annunciator). When

the arrow and two-letter codes are displayed, it indicates

the second line is showing a selectable message

submenu. The second line displays selectable or pre-

emptive messages.

A selectable message supplies information for flame

strength, system status indication, system or self-

diagnostics and troubleshooting.

A pre-emptive message has parentheses around the

message and supplies a detailed message to support the

sequence status information. A pre-emptive message can

also be a lockout message. A pre-emptive message

replaces a selectable message to support the sequence

status information. It also replaces a selectable message

after

60 seconds or if a lockout message is available.