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Honeywell 7800 SERIES Manual

7800 series rm7890a,b,c relay module.
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7800 SERIES RM7890A,B,C
The Honeywell RM7890 is a microprocessor
based integrated burner control for automatically
fired gas, oil or combination fuel single-burner appli-
cations. The RM7890 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 Mod-
ule, First-Out Expanded Annunciator and COM-
BUSTION SYSTEM MANAGER™ Software.
The RM7890 is programmed to provide a level of
safety, functional capability and features beyond the
capacity of conventional controls.
Functions provided by the RM7890 include auto-
matic burner sequencing, flame supervision, system
status indication, system or self-diagnostics and
troubleshooting.
Safety features:
- Closed loop logic test.
- Dynamic AMPLI-CHECK™.
- Dynamic input check.
- Dynamic safety relay test.
- 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.
Communication interface capability.
Dependable, long-term operation provided by microcom-
puter 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.
First-out expanded annunciation with 26 Light Emitting
Diodes (LEDs) for limits and interlocks (optional).
Five (LEDs) for sequence information.
Interchangeable plug-in flame amplifiers.
Local or remote annunciation of RM7890 operation and fault
information (optional).
Nonvolatile memory; RM7890 retains history files and
sequencing status after loss of power.
Remote reset (optional).
Report generation (optional).
Selectable relight or lockout on loss of flame.
Shutter drive output (RM7890B).
Burner controller data (optional):
- Expanded annunciator status.
- Flame signal strength.
- Hold status.
- Lockout/alarm status.
65-0126-2
- 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.
• Expanded annunciator data 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.
• Manufacturing code.
• On/Off status of all digital inputs and outputs.
• Software revision and version of RM7890 and op-
tional Keyboard Display Module.
• Status of configuration jumpers.
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Principle Technical Features .......................... 8
Safety Provisions ............................................ 8
Installation ..................................................... 9
Wiring .......................................................... 11
Assembly ...................................................... 13
Operation ..................................................... 15
Static Checkout ............................................. 17
Checkout ...................................................... 19
Troubleshooting ........................................... 25
G. R. • Rev. 2-94 • © Honeywell Inc. 1994 • Form Number 65-0126-2
1
Relay Module
65-0126-2

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   Summary of Contents for Honeywell 7800 SERIES

  • Page 1: Table Of Contents

    — Expanded annunciator status. Static Checkout ..........17 — Flame signal strength. Checkout ............19 — Hold status. — Lockout/alarm status. Troubleshooting ........... 25 G. R. • Rev. 2-94 • © Honeywell Inc. 1994 • Form Number 65-0126—2 65-0126—2 65-0126-2...
  • Page 2: Specifications

    Can also be 65 VA pilot duty with motorized valve, 1150 VA inrush, 460 VA open, 250 VA hold. Ordering Information ® When purchasing replacement and modernization products from your 7800 SERIES distributor, refer to the TRADELINE Catalog for complete ordering number.
  • Page 3 Circuitry tests the flame signal amplifier at least 12 times a minute during burner operation and shuts down the burner if the amplifier fails. Order flame rod separately; see holder Instructions. Use only Honeywell Photocell, part no. 38316. Use with RM7890B only.
  • Page 4 RM7890A,B,C SPECIFICATIONS SEQUENCE TIMING FOR NORMAL OPERATION: Device Initiate Standby PilotFlame Establishing Period RM7890A 10 sec 4 or 10 sec RM7890B 10 sec 4 or 10 sec RM7890C 10 sec Not applicable *STANDBY and RUN can be an infinite time period. RM7890A1031 has a fixed PFEP timing of 30 seconds.
  • Page 5 RM7890A,B,C SPECIFICATIONS Fig. 2—Mounting dimensions of RM7890 Relay Module and Q7800B Subbase in in. [mm]. BURNER CONTROL [127] POWER PILOT FLAME MAIN ALARM RESET [155] 5 [127] REMOVE ONLY FOR TERMINAL TEST ACCESS. M5149 Fig. 3—Rectification detectors. IGNITION ELECTRODE FLAME ROD (Q179C ONLY) CERAMIC INSULATORS...
  • Page 6 RM7890A,B,C SPECIFICATIONS Fig. 4—Ultraviolet detectors. [105] 2 [51] 1/2-14 NPSM 4 [102] COLLAR WITH 6 FOOT [1.83 METER] 1–11-1/2 NPSM INTERNAL THREADS LEADWIRES (2) [89] INTERNAL THREADS [30] [27] [25] [38] 6 FOOT COLLAR WITH 1/2-14 NPSM [67] [1.83 METER] INTERNAL THREADS INSERTION DEPTH LEADWIRES (2) 3...
  • Page 7 RM7890A,B,C SPECIFICATIONS Fig. 4—Ultraviolet detectors (continued). [300] 1 INCH NPT [198] [147] 15/16 [24] DIA. [55] [47] [158] [147] [64] [168] 1 [25] 15/16–18 UNC (2 EACH) 2 [51] M5084 C7076D Fig. 5—Infrared detector. CELL MOUNT HEAT BLOCK [41] [27] [70] [32] [32]...
  • Page 8: Principle Technical Features

    RM7890A,B,C PRINCIPAL TECHNICAL FEATURES • SAFETY PROVISIONS Principal Technical Features 3. SAFE START CHECK (EXCEPT RM7890C) The RM7890 provides all customary flame safeguard a. Ignition/intermittent pilot valve terminal is ener- functions while providing significant advancements in the gized. areas of safety, annunciation and system diagnostics. b.
  • Page 9: Installation

    SELF-DIAGNOSTICS isolated and reported by the optional Keyboard Display Sequence Status Lights (LEDs) provide positive visual Module. See the 7800 SERIES System Annunciation Diag- indication of the program sequence: POWER, PILOT, nostics and Troubleshooting, form 65-0118. FLAME, MAIN and ALARM. The green POWER LED...
  • Page 10 RM7890A,B,C INSTALLATION IMPORTANT: 4. This digital apparatus does not exceed the Class B 1. For on-off gas-fired systems, some authorities who limits for radio noise of digital apparatus set out in the have jurisdiction prohibit the wiring of any limit or Radio Interference Regulations of the Canadian De- operating contacts in series between the flame safe- partment of Communications.
  • Page 11: Wiring

    RM7890A,B,C INSTALLATION • WIRING MOUNTING WIRING SUBBASE The Q7800 can be mounted directly in the control cabinet. Be sure to allow adequate clearance for servicing, installation, access and removal of the RM7890, Dust Cover, flame NOTE: For installation dimensions, see Figs. 1 or 2. amplifier, flame amplifier signal voltage probes, electrical 1.
  • Page 12 RM7890A,B,C WIRING Fig. 7—Wiring the RM7890A,B,C. Q7800 (L1) 120V ALARM BURNER CONTROLLER/LIMITS INTERMITTENT PILOT/IGNITION MAIN FUEL VALVE(S) IGNITION RECTIFYING FLAME ROD, RECTIFYING (HOT) PHOTOCELL, OR INFRA- RED (LEAD SULFIDE) FLAME DETECTOR MASTER SWITCH C7027A, C7035A, OR BLUE WHITE C7044A ULTRAVIOLET FOR DIRECT SPARK IGNITION (OIL FLAME DETECTOR OR GAS)
  • Page 13: Assembly

    RM7890A,B,C ASSEMBLY Assembly MOUNTING RM7890 Fig. 9—Wall or burner installation. NOTE: For installation dimensions, see Figs. 1 or 2. RELAY MODULE MOUNTING 1. Mount the RM7890 vertically, see Figs. 8 or 9, or mount horizontally with the knife blade terminals pointing downward.
  • Page 14 SENSOR WHITE EARTH GROUND BROWN SHUTTER C7076A C7076D SHUTTER TERMINAL BLOCK ULTRAVIOLET (C7027/C7035/C7044) L1 (HOT) L2 (COMMON) BLUE 7800 SERIES WHITE SOLID STATE SELF-CHECKING SOLID STATE ULTRAVIOLET (C7012E,F) ULTRAVIOLET (C7012A,C) BLUE BLUE YELLOW YELLOW WHITE WHITE BLACK BLACK BLACK BLACK...
  • Page 15: Operation

    RM7890A,B,C OPERATION Operation Sequence of Operation NORMAL START-UP SAFE-START CHECK The RM7890 has the following operating sequences, see (EXCEPT RM7890C) Figs. 13 and 15. The RM7890 verifies that a flame does not exist and proceeds into the Ignition Trial. If a flame is present, the INITIATE RM7890 will recycle to the STANDBY period.
  • Page 16 RM7890A,B,C OPERATION Fig. 14—Sequence status LEDs. CAPTIVE MOUNTING SCREW DUST COVER SEQUENCE RELAY STATUS MODULE LEDs FLAME RESET AMPLIFIER PUSHBUTTON FLAME FLAME CURRENT SIMULATOR INPUT TEST JACKS M8995 Fig. 15—Led sequence status display information (see Fig. 14). STANDBY RESET/ SAFE- HOLD: F/G ALARM START...
  • Page 17: Static Checkout

    RM7890A,B,C OPERATION • STATIC CHECKOUT SERVICE NOTE: Clipping and removing a site- Fig. 16—Selectable site-configurable jumpers. configurable jumper enhances the level of safety. If using a 3-second amplifier, site-configurable jumper JR2 must SELECTABLE CONFIGURATION JUMPERS be clipped and removed. If not removed, an F46 Lockout will occur.
  • Page 18 RM7890A,B,C STATIC CHECKOUT TABLE 5—STATIC CHECKOUT. Test RM7890 Test If Operation Is Abnormal, Models Jumpers Voltmeter Normal Operation Check The Items Listed Below WARNING Make sure all manual fuel shutoff valves are closed. IMPORTANT: Low fuel pressure limits, if used, could be open. Bypass them with jumpers for the remaining Static tests (if required).
  • Page 19: Checkout

    2. Flame detector(s) is clean, installed and positioned If an RM7890 is replaced with a lower or higher properly. Consult the applicable Instructions. functioning 7800 SERIES Relay Module, the burner 3. Correct combination of amplifier and flame detector(s) will not sequence unless wiring changes are made.
  • Page 20 RM7890A,B,C CHECKOUT TABLE 5—FLAME SIGNAL (see Fig. 17). Minimum Acceptable Maximum Expected Flame Detector Flame Signal Amplifier Steady dc Voltage dc Voltage Flame Rod R7847A,B 1.25 Vdc 5.0 Vdc at the Keyboard Photocell Display Module. C7012A,C C7012E,F R7847C C7015A R7848A,B C7027A R7849A,B 5.0 Vdc at a 20...
  • Page 21 RM7890A,B,C CHECKOUT 1. Open the master switch. 9. When the RUN period is displayed by the MAIN LED, 2. Make sure that the manual main fuel shutoff valve(s) make sure the automatic main fuel valve is open; then is closed. Open the manual pilot shutoff valve. If the pilot smoothly open the manual main fuel shutoff valve(s) and takeoff is downstream from the manual main fuel shutoff watch for main burner flame ignition.
  • Page 22 RM7890A,B,C CHECKOUT INITIAL LIGHTOFF CHECK FOR DIRECT a. Open the manual second stage fuel valve(s). SPARK IGNITION b. Restart the system by raising the set point of the This check applies for gas and oil burners that do not use operating controller.
  • Page 23 RM7890A,B,C CHECKOUT Ignition interference can subtract from (decrease) or add to (increase) the flame signal. If it decreases the flame signal NOTE: If there is not flame present for the selected Flame enough, it will cause a safety shutdown. If it increases the Failure Response Test (FFRT), the RM7890 will lock- flame signal, it could cause the FLAME LED to come on out.
  • Page 24 RM7890A,B,C CHECKOUT visibly ceased to glow. Infrared radiation from a hot refrac- NOTE: The Honeywell Q624A Solid State Spark Generator tory is steady, but radiation from a flame has a flickering will prevent detection of ignition spark when properly characteristic. The infrared detection system responds only applied with the C7027, C7035 or C7044 Minipeeper to flickering infrared radiation;...
  • Page 25: Troubleshooting

    ALARM LED by using the optional Keyboard Display the fault occurred. The Historical Information can be viewed Module or 7800 SERIES System Annunciation Diagnostics by the optional S7800A1001 Keyboard Display Module. and Troubleshooting, form 65-0118.
  • Page 26 RM7890A,B,C TROUBLESHOOTING TABLE 6—SEQUENCE AND STATUS HOLD INFORMATION. NOTE: Normal sequences are in bold type, while abnormal sequences are not in bold type. Sequence Information INITIATE The LED indicates the burner status, POWER, which is a stabilization period for the RM7890 to check for any fluctuations in AC line voltage inputs or control input on power-up or during normal operation.
  • Page 27 65-0126—2...
  • Page 28 Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, Minnesota 55422 Scarborough, Ontario M1P 2V9 QUALITY IS 65-0126—2 Printed in U.S.A.

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  • #unknown Mar 19, 2018 07:26:
    SB will not energize, power is on. fuses and relays are all good, purging motor is good, Water level is good, before it went to lock out I get fsg alarm. What are possible causes?