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APPLICATION
The S7800A Keyboard Display Module (KDM) provides
first-out annunciation and system diagnosis using a two-row
by twenty-column readout. The KDM provides local or remote
annunciation of operation and fault information, remote reset,
report generation, burner control data and diagnostic
information. The KDM is part of the 7800 SERIES of
microprocessor-based burner controls for gas, oil, coal or
combination fuel single burner applications.
The 7800 SERIES is programmed to provide a level of safety,
functional capabilities and features beyond the capacity of
conventional controls.
® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved
S7800A Keyboard Display Module
7800 SERIES
FEATURES
Application flexibility.
Communication interface capability.
Dependable, long-term operation provided by
microcomputer technology.
First-out annunciation and system diagnostics
provided by a 2-row by 20-column display.
First-out expanded annunciation with 24 limit and
interlock Light Emitting Diodes (LED).
• Local or remote annunciation of operation and
fault information.
• UL Class 4 rating when P/N 204718A,C NEMA 4 cover
is used.
Remote reset.
Report generation.
Burner controller data:
— Sequence status.
— Sequence time.
— Hold status.
— Lockout/alarm status.
— Flame signal strength.
— Expanded annunciator status.
— Total cycles of operation.
— Total hours of operation.
— Fault history of six most recent faults:
• Cycles of operation at time of fault.
• Expanded annunciator data at time of fault.
• Fault message and code.
• Hours of operation at time of fault.
• Sequence status at time of fault.
• Sequence time at time of fault.
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Wiring ...............................................................................
Troubleshooting ................................................................ 11
PRODUCT DATA
Contents
1
1
2
2
3
4
65-0090-4

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Table of Contents

   Also See for Honeywell 7800 Series

   Related Manuals for Honeywell 7800 Series

   Summary of Contents for Honeywell 7800 Series

  • Page 1 — Total hours of operation. — Fault history of six most recent faults: The 7800 SERIES is programmed to provide a level of safety, functional capabilities and features beyond the capacity of • Cycles of operation at time of fault.
  • Page 2 Honeywell, 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
  • Page 3 1. This equipment generates, uses and can radiate and, with a hinge action, push on the lower corners of radio frequency energy and, if not installed and used the KDM to secure it to the 7800 SERIES Relay in accordance with the instructions, can cause Module.
  • Page 4 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Door Panel Mounting Fig. 3. Panel mounting of a keyboard display module. 1. Select the location on the door panel for flush mounting. 2. Pay attention to the insertion dimensions of the two Fig. 4. Remote mounting of a keyboard display module KDM screws, two interlocking ears, and the two plug-in using a 203765 Remote Display Mounting Bracket.
  • Page 5 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 1. Recommended Wire Size and Part Number. Application Recommended Wire Size Recommended Part Number Keyboard Display Module 22 AWG two-wire twisted pair with Belden 8723 shielded cable or equivalent. ground, or five-wire. Data ControlBus™ Module 22 AWG two-wire twisted pair with Belden 8723 shielded cable or equivalent.
  • Page 6 It also replaces a selectable message after 60 seconds if it or a lockout message is S7800 KEYBOARD DISPLAY MODULE available. The 7800 SERIES Relay Module LED provide (MOUNTED ON 7800 SERIES RELAY MODULE) positive visual indication of the Relay Module sequence. The...
  • Page 7 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Keyboard Functions When the last item of the selectable message is viewed, the display wraps around and displays the first The keyboard contains four push-buttons with separate selectable message again. functions (SCROLL-down, SCROLL-up, MODE, and ↔...
  • Page 8 7800 SERIES S7800A KEYBOARD DISPLAY MODULE SAVE SAVE M1934C Fig. 11. MODE push-button function. 4. SAVE function, see Fig. 12. The SAVE function enables users to identify the selectable message they want to view upon power restoration. The second line selectable message are restored to the most recently saved selection when power returns.
  • Page 9 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 3. Selectable Messages . Selectable Possible States/ Range Message/Display Description (Terminals) Comments Flame Signal Flame signal strength. 0 - 5.0 Vdc Flame Amp (+ and Flame relay pull-in and drop- - (Com)) out value 1.25 Vdc.
  • Page 10 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 3. Selectable Messages (Continued). Selectable Possible States/ Range Message/Display Description (Terminals) Comments Valv/Start T21 Interrupted/Intermittent = 1 or 0 Indicates if output is on or off, Pilot Valve, First Stage Oil energized or de-energized.
  • Page 11: Troubleshooting

    Internal faults and external faults such as interlock failures, After the KDM is installed, return the 7800 SERIES to normal flame failures and false flame signals are annunciated by the operation, restore power and run the system through at least KDM via the 7800 SERIES Relay Module.
  • Page 12 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 5. Keyboard Display Module Sequence and Status Hold Messages . Sequence Status INITIATE mm:ss The Keyboard Display Module (KDM) indicates the burner status, INITIATE, a stabilization period for the relay module to check for any fluctuations in ac line voltage inputs or control inputs on power up or during normal operation.
  • Page 13 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 5. Keyboard Display Module Sequence and Status Hold Messages (Continued). Sequence Status PURGE HOLD: F/G The KDM indicates the burner status and that a flame is detected. The burner sequence does not (Flame Detected) advance through PREPURGE because a flame is detected as being present.
  • Page 14 7800 SERIES Relay Module but will not reset a lockout condition. Lockout Messages When the 7800 SERIES is locked out, it displays a repeating SAVE cycle of messages. See Table 8. There are four states in the...
  • Page 15 7800 SERIES S7800A KEYBOARD DISPLAY MODULE 4. State 4: In the fourth state, both lines are blanked for NOTE: For further explanation of Lockout Messages, Trou- one-half second, then the display sequences to the first bleshooting and Checkout, refer to form 65-0229.
  • Page 16 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 7. Hold and Fault Message Summary (Continued). Fault Code System Failure Recommended Troubleshooting Fault 11 Running Interlock powered at 1. Check wiring to make sure that interlocks are connected *Running ILK On* improper sequence point.
  • Page 17 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 7. Hold and Fault Message Summary (Continued). Fault Code System Failure Recommended Troubleshooting Fault 18 Flame sensed when the shutter 1. Check that flame is not present in the combustion chamber. *Flame Detected* is open and no flame is Correct any errors.
  • Page 18 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 7. Hold and Fault Message Summary (Continued). Fault Code System Failure Recommended Troubleshooting Fault 27 Start Switch was on during 1. Start Switch held on too long. *Start Switch On* PREPURGE (Device specific).
  • Page 19 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 7. Hold and Fault Message Summary (Continued). Fault Code System Failure Recommended Troubleshooting Fault 32 Combustion Airflow Interlock 1. Check wiring and correct any errors. *Airflow Switch* fault. 2. Inspect the fan; make sure there is no blockage of the air intake and it is supplying air.
  • Page 20 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 7. Hold and Fault Message Summary (Continued). Fault Code System Failure Recommended Troubleshooting Fault 45 Low Fire Interlock switch failure 1. 1. Check wiring and correct any errors. *Low Fire Sw. Off* to close or stay closed.
  • Page 21 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 7. Hold and Fault Message Summary (Continued). Fault Code System Failure Recommended Troubleshooting Fault 51 Flame signal value is too high 1. Make sure that flame detector and flame amplifier are *Flame Too Strong* to be valid.
  • Page 22 7800 SERIES S7800A KEYBOARD DISPLAY MODULE Table 7. Hold and Fault Message Summary (Continued). Fault Code System Failure Recommended Troubleshooting Fault 68 Preignition Interlock fault. 1. Check wiring and correct any errors. *Preignition ILK* 2. Inspect the Preignition Interlock switches and make sure they work properly.
  • Page 23 If an Expanded Annunciator is wired to the limit control and message demonstrates which device opened first in a interlock control strings, and connected to the 7800 SERIES monitored string of limits or interlocks. Relay Module, additional hold messages, fault messages or code numbers enhance the original hold messages, fault 1/8 in.
  • Page 24 7800 SERIES S7800A KEYBOARD DISPLAY MODULE ® Contact Esys for more information about this product: email: esys.us Automation and Control Solutions Honeywell International Honeywell Europe S.A. Honeywell Latin American ® Esys The Energy Control Company™ website: http://www.esys.us Region Honeywell Honeywell Limited-Honeywell Limitée...

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