Honeywell RM7824A Product Data
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Honeywell RM7824A Product Data

Honeywell RM7824A Product Data

Relay module
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APPLICATION

The Honeywell RM7824A Relay Module is a 24 Vdc
microprocessor-based integrated burner control for
automatically fired gas, oil or combination fuel single burner
applications. The RM7824A consists of the Relay Module,
Subbase and Amplifier are required to complete the system.
Options include Keyboard Display Module, Personal
Computer Interface, Data ControlBus™ Module, Remote
Display Module and Combustion System Manager™
Software.
The RM7824A is programmed to provide a level of safety,
functional capability and features beyond the capacity of
conventional controls.
Functions provided by the RM7824A include automatic burner
sequencing, flame supervision, system status indication,
system or self-diagnostics and troubleshooting.
® U.S. Registered Trademark
Copyright © 2003 Honeywell International Inc.
All Rights Reserved
RM7824A Relay Module

FEATURES

• Safety features:
- Closed loop logic test.
- Dynamic input check.
- Dynamic safety relay check.
- Dynamic self-check logic.
- Expanded safe-start check.
- Internal hardware status monitoring.
- Tamper resistant timing and logic.
• Access for external electrical voltage checks.
• Application flexibility.
• Communications interface capability.
• Dependable, long-term operation provided by
microcomputer technology.
• First-out annunciation and system diagnostics are
provided by a 2-row by 20-column Vacuum
Fluorescent Display (VFD) located on the optional
Keyboard Display Module.
• Five light emitting diodes (LEDs) for sequence
information.
• Flame signal strength.
• Local or remote annunciation of RM7824A operation
and fault information (optional).
• Nonvolatile memory; RM7824A retains history files and
sequencing status after loss of power.
• Plug-in flame amplifier.
• Remote reset (optional).
• Report generation (optional).
• Shutter drive output.
• Burner controller data (optional):
- Hold status.
- Lockout/alarm status.
Application ........................................................................
Features ............................................................................
Specifications ....................................................................
Ordering Information .........................................................
Principal Technical Features .............................................
Safety Provisions ..............................................................
Installation .........................................................................
Wiring ................................................................................
Operation .......................................................................... 11
Checkout ........................................................................... 14
7800 SERIES
PRODUCT DATA
Contents
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5
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65-0155-2

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  • Page 1: Table Of Contents

    (optional). Software. • Nonvolatile memory; RM7824A retains history files and The RM7824A is programmed to provide a level of safety, sequencing status after loss of power. functional capability and features beyond the capacity of • Plug-in flame amplifier.

  • Page 2: Specifications

    If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care...
  • Page 3 7800 SERIES RM7824A RELAY MODULE IMPORTANT CAUTION Flame Detection System available for use with RM7824A. To select your Plug-in Flame Signal Equipment Damage Hazard. Amplifier and applicable Flame Detector, see Table 2 Using wrong software can damage equipment. and Fig. 3.
  • Page 4 BURNER CONTROL (127) 5-1/4 (133) 5 (127) M5872 REMOVE ONLY FOR TERMINAL TEST ACCESS. Fig. 1. Mounting dimensions of RM7824A Relay Module and Q7800A Subbase in in. (mm). BURNER CONTROL (127) 6-3/32 (155) 5 (127) REMOVE ONLY FOR TERMINAL TEST ACCESS.

  • Page 5: Principal Technical Features

    Self-checking circuitry tests all electronic components in the M17783A flame detection system and amplifier twelve times per minute and shuts down the RM7824A if the detection system fails. Fig. 5. C7927 detector dimensions in in. (mm). Dynamic Input Check PRINCIPAL TECHNICAL FEATURES...

  • Page 6: Installation

    English text and numbered 5. Loads connected to the RM7824A must not exceed code via the optional Keyboard Display Module. It monitors all those listed on the RM7824A label or the specifications field input circuits, including the flame signal amplifier.

  • Page 7: Wiring

    8. Make sure loads do not exceed the terminal ratings. with the bifurcated contacts pointing down. The Refer to the label on the RM7824A or to the ratings in standard vertical position is recommended. Any other the specifications; see Table 1.
  • Page 8 RESET M5821 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Fig. 6. Internal block diagram of the RM7824A (see Fig. 6 for detailed wiring instructions). ASSEMBLY a. Allow an additional two inches below the RM7824A for the flame amplifier mounting.
  • Page 9 1. Align the two interlocking ears of the Dust Cover with 1. Disconnect the power supply before beginning the two mating slots on the RM7824A (see Fig. 10). installation to prevent electrical shock and equipment 2. Insert the two interlocking ears into the two mating slots, damage.
  • Page 10 Fig. 9. Wall or burner installation. Installing Flame Detector NOTE: Table 2 and Fig. 12 list the flame detectors available Fig. 11. Flame signal amplifier mounting. for use with the RM7824A. Make sure the correct combination of amplifier and flame detector(s) is used. 65-0155—2...

  • Page 11: Operation

    INITIATE sequence will restart. If the condition is not corrected and the hold condition exists for four minutes, the RM7824A will lock out. Causes for hold conditions in the INITIATE sequence are: • Vdc dropout is detected.
  • Page 12 3. With flame proven, the ignition, terminal 10, is de-energized and the main valve, terminal 9, is energized. The RM7824A is now in RUN and will remain in RUN until the controller input, terminal 6, opens, indicating that the demand is satisfied or a limit has opened.
  • Page 13 RM7824A locks out. The 2. Two jumper wires: No. 14 wire, insulated, 12 in. (305 RM7824A cannot be reset and has to be replaced. mm) long, with insulated alligator clips at both ends. SERVICE NOTE: Clipping and removing a site-configurable General Instructions jumper enhances the level of safety.

  • Page 14: Checkout

    WARNING Improper replacement of relay module will cause equipment failure. Explosion or Fire Hazard. If an RM7824A is replaced with a lower or higher Can cause severe injury, death or property functioning 7800 SERIES Relay Module, the burner damage. will not sequence unless wiring changes are made.
  • Page 15 8. Lockout switch is reset (push in reset pushbutton) only if are tight. the RM7824A is powered. See Fig. 1 and 2. 2. Flame detector(s) is clean, installed and positioned 9. 9.System is in the STANDBY condition. POWER LED is properly.
  • Page 16 12. Let the RM7824A recycle to the RUN period. Smoothly 3. Close the master switch and start the system with a call open the manual fuel shutoff valve(s) and try lightoff for heat by raising the setpoint of the operating again.
  • Page 17 4. Close the master switch and start the system with a call attention. for heat by raising the setpoint of the operating 21. Make sure all readings are within the required ranges controller see Fig. 11 or RM7824A sequencing. The before proceeding. primary sequence should start with the SAFE-START sequence.
  • Page 18 Operating Manual and resight the detector further out from the spark, or away from possible reflection. If may a. Push the reset pushbutton and allow the RM7824A be necessary to construct a barrier to block the ignition to recycle to PILOT IGNITION.

  • Page 19: Troubleshooting

    If the RM7824A is in a HOLD status, the following conditions could exist: INITIATE HOLD The LED indicates the burner status, POWER, and that the RM7824A is waiting for excess line noise to (Vdc Frequency/noise) clear up. The burner sequence will not advance into STANDBY until the excess line noise, which prevents sufficient read of the voltage input, ceases.
  • Page 20 SAFE START CHECK The LED indicates the burner status, POWER, which is the period of time after STANDBY. The RM7824A is verifying that a flame is not present before the start of Ignition Trials. If a flame is present, the RM7824A will recycle to STANDBY.

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7800 series

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