Honeywell 7800 Series Manual
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Honeywell 7800 Series Manual

Relay module
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The Honeywell RM7838B is a microprocessor based
integrated burner control for industrial process semi-
automatically fired gas, oil, coal or combination of fuels
for single burner applications. The RM7838B consists
of a Relay Module, Subbase, Amplifier, Keyboard Dis-
play Module and Purge Card. Options include Personal
Computer Interface, DATA CONTROLBUS MOD-
ULE™, Remote Display Mounting, First-Out Expanded
Annunciator and software COMBUSTION SYSTEM
®
MANAGER
.
The RM7838B is programmed to provide a level of
safety, functional capability and features beyond the
capacity of conventional process control combustion
systems.
Functions provided by the RM7838B include auto-
matic modulated high fire and low fire proven purge,
burner pilot start up with pilot valve hold, a special
pilot valve hold from the Run condition, flame supervi-
sion, system status indication, system or self-diagnos-
tics and troubleshooting.
Safety features:
— Combustion Interlock check.
— Closed loop logic test.
— Dynamic input check.
— Dynamic safety relay test.
— Dynamic self-check logic.
— Expanded safe-start check.
— High Fire Purge Switch test.
— Internal hardware status monitoring.
— Low Fire Purge Switch test.
— Tamper resistant timing and logic.
Access for external electrical voltage checks.
Application flexibility.
Communication interface capability via personal com-
®
puter utilizing MicroSoft
First out annunciation and system diagnostics provided by
2 row by 20 column Vacuum Fluorescent Display (VFD)
located within the local or remotely mounted Keyboard
Display Module.
First out expanded annunciation with 24 limit and inter-
lock Light Emitting Diodes (LEDs) (optional).
Five sequence information LEDs.
Five function Run/Test Switch.
Interchangeable plug-in flame amplifiers.
Local or remote annunciation of operation and fault
information.
Dependable, long-term operation provided by microcom-
puter technology.
Nonvolatile memory for retaining history files and se-
quencing status after loss of power.
Remote reset (optional).
L.Z. • Rev. 1-95 • ©Honeywell Inc. 1995
RM7838B Relay Module
Windows™ software.
7800 SERIES
Report generation (optional).
Burner controller data (optional):
— 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.
— Diagnostic information:
• Device type.
• Flame amplifier type.
• Flame failure response time.
• Manufacturing code.
• On/Off status of all line voltage digital inputs.
• Selected purge time.
• Software revision and version of RM7838B and
Keyboard Display Module.
• Status of configuration jumpers.
• Status of Run/Test switch.
• On/Off status of all line voltage digital outputs.
1
65-0120—1
65-0120-1
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Summary of Contents for Honeywell 7800 Series

  • Page 1 • Status of Run/Test switch. Nonvolatile memory for retaining history files and se- • On/Off status of all line voltage digital outputs. quencing status after loss of power. Remote reset (optional). L.Z. • Rev. 1-95 • ©Honeywell Inc. 1995 65-0120—1 65-0120-1...

  • Page 2: Table Of Contents

    Module template ............ Ordering Information ® When purchasing replacement and modernization products from your 7800 SERIES distributor, refer to the TRADELINE Catalog for complete ordering number. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1.

  • Page 3: Specifications

    RM7838B SPECIFICATIONS Specifications ELECTRICAL RATINGS (See Table 1): MOUNTING: Q7800A1005 for panel mount or Q7800B1003 Voltage and Frequency: 120 Vac (+10/-15%), 50 or 60 Hz for wall or burner mount. REQUIRED COMPONENTS: (+/- 10%)* Plug-in Flame Signal Amplifier (see Table 2) Keyboard Display Module: 13.0 Vdc peak full wave rectified (+20/-15%) Mounting Subbase:...

  • Page 4: Table 2-Flame Detection Systems

    RM7838B SPECIFICATIONS TABLE 1—TERMINAL RATINGS (Continued). Terminal No. Description Ratings F(11) Flame Sensor 60 to 220 Vac, current limited. Firing Rate High Fire 120 Vac, 75 VA pilot duty. Firing Rate Common 120 Vac, 75 VA pilot duty. Firing Rate Low Fire 120 Vac, 75 VA pilot duty.
  • Page 5 Sensitivity) Order flame rod separately; see holder Instructions. Use only Honeywell Photocell, part no. 38316. The C7012A,C, C7027, C7035 and C7044 flame detectors should be used only on burners that cycle on-off at least once every twenty-four hours. Appliances with burners that remain on for twenty-four hours continuously or longer should use the C7012E,F Flame Detector with the R7847C Amplifier or the C7076A Flame Detector with the R7886A Amplifier as the ultraviolet flame detection system.

  • Page 6: Fig. 1-Mounting Dimensions Of The Rm7838B Relay Module And Q7800A Subbase, In In. (Mm)

    RM7838B SPECIFICATIONS Fig. 1—Mounting dimensions of the RM7838B Relay Module and Q7800A Subbase, in in. (mm). BURNER CONTROL SCROLL MODE (127) SAVE POWER PILOT FLAME MAIN ALARM RESET 5-1/4 (133) 5 (127) M1984A REMOVE ONLY FOR TERMINAL TEST ACCESS. Fig. 2—Mounting dimensions of the RM7838B Relay Module and Q7800B Subbase, in in. (mm). BURNER CONTROL SCROLL MODE...

  • Page 7: Fig. 3-Mounting Dimensions Of The Keyboard Display Module In In. (Mm)

    RM7838B SPECIFICATIONS Fig. 4—Rectification Detectors (Continued). Fig. 3—Mounting dimensions of the Keyboard Display Module in in. (mm) . MOUNTING FLANGE 3/4–14 NPT 7-7/32 (183) BURNER CONTROL 5-1/8 (130) 3-3/4 (95) 2-3/4 (69) 3-7/16 (87) SCROLL MODE SAVE 1/2–14 NPSM 5-1/4 (133) LEADWIRES 4-27/32 (123) FACEPLATE...

  • Page 8: Fig. 5-Ultraviolet Detectors

    RM7838B SPECIFICATIONS Fig. 5—Ultraviolet detectors 4-1/8 (105) 2 (51) 1/2-14 NPSM COLLAR WITH 4 (102) 6 FOOT (1.83 METER) 1–11-1/2 NPSM INTERNAL THREADS 1-3/16 LEADWIRES (2) INTERNAL (30) 3-1/2 (89) THREADS 31/32 1-1/16 1-1/2 (25) (27) (38) 6 FOOT 2-5/8 (67) COLLAR WITH 1/2-14 NPSM [1.83 METER] INTERNAL THREADS...

  • Page 9: Fig. 6-Infrared Detectors

    RM7838B SPECIFICATIONS Fig. 5—Ultraviolet detectors (Continued) 1-1/16 (27) 2-1/4 1 INCH NPT (57) 2-1/4 (57) (102) 2-5/16 4 (102) 1-13/32 (188) (58) 10-9/32 (261) 4-27/32 (123) 7/8 (22) OPENING 3/4 (19) FOR 1/2-INCH CONDUIT 29/32 (23) 1-19/32 (41) 3/8 INCH NPT ALLOW 9 INCHES (228 MILLIMETERS) 2-11/16 7-5/8 (194)

  • Page 10: Principal Technical Features

    RM7838B PRINCIPAL TECHNICAL FEATURES • SAFETY PROVISIONS Principal Technical Features The RM7838B provides all customary flame safeguard b. Flame is detected. functions while providing significant advancements in the c. Lockout Interlock opens during Hold. areas of safety, annunciation and system diagnostics. d.
  • Page 11 RM7838B SAFETY PROVISIONS DYNAMIC FLAME AMPLIFIER AND purging is complete. The RM7838B will lockout and an- SHUTTER CHECK nunciate an alarm if the switch fails to close within the hold Self-checking circuitry tests all electronic components in time period. the flame detection system and amplifier 10 to 12 times per minute and shuts down the RM7838B if the detection system OFF CYCLE (STANDBY OR PURGE) FLAME fails.

  • Page 12: Installation

    The Preignition Keyboard Display Module. See Table 12, Hold and Fault Interlock must be energized throughout STANDBY and Message Summary, or the 7800 SERIES Service Handbook, PURGE. If Preignition Interlock opens during STANDBY, form 65-0111.

  • Page 13: Fig. 7-Internal Block Diagram Of The Rm7838B

    RM7838B INSTALLATION Fig. 7—Internal block diagram of the RM7838B (See Figs. 8 or 9 for detailed wiring instructions). BURNER CONTROL (HOT) 120 Vac RECIRCULATING BLOWER PLUG-IN PURGE TIMER CARD CONFIGURATION TEST JUMPERS JACK FLAME SIGNAL RUN/TEST SWITCH PLUG-IN FLAME MICROCOMPUTER AMPLIFIER TEST RESET...
  • Page 14 RM7838B INSTALLATION IMPORTANT: 3. For surface mounting, use the template (see Fig. 32) to 1. For on-off gas-fired systems, some authorities who mark the four screw locations. Drill the pilot holes. have jurisdiction prohibit the wiring of any limit or 4.

  • Page 15: Checkout

    3(c) Refer to the label on the RM7838B or to the ratings in Speci- provided as part of the 7800 SERIES device fications, see Table 1. ControlBus connection. Connect the shield at both 9.

  • Page 16: Fig. 8-Rm7838B Wiring With S445 Start-Stop

    RM7838B INSTALLATION Fig. 8—RM7838B wiring with S445 start-stop station. (HOT) MASTER SERIES 90 RECIRCULATING SWITCH FIRING RATE SERIES 90 Q7800 SUBBASE BLOWER MOTOR CONTROLLER HIGH FIRE BURNER CONTROL COMMON DPST ALARM SILENCING SWITCH LOW FIRE 120V ALARM RECIRCULATING COMBUSTION MODULATE BLOWER AFS (L1) COMBUSTION...

  • Page 17: Fig. 9-Rm7838B Wiring With Separate Start-Stop

    RM7838B INSTALLATION Fig. 9—RM7838B wiring with separate start-stop station. (HOT) MASTER SERIES 90 RECIRCULATING SWITCH FIRING RATE SERIES 90 Q7800 SUBBASE BLOWER MOTOR CONTROLLER HIGH FIRE BURNER CONTROL COMMON DPST ALARM SILENCING SWITCH LOW FIRE 120V ALARM RECIRCULATING COMBUSTION MODULATE BLOWER AFS (L1) PILOT VALVE...

  • Page 18: Fig. 10-Rm7838B Wiring With Separate Start And Stop Stations With 4 To 20 Ma Firing Rate Control Circuit

    RM7838B INSTALLATION Fig. 10—RM7838B wiring with separate start and stop stations with 4 to 20 mA firing rate control circuit. (HOT) MASTER M7284 4-20 mA RECIRCULATING SWITCH FIRING RATE OUTPUT EXHAUST Q7800 SUBBASE MOTOR CONTROLLER BLOWER HIGH FIRE BURNER COMMON CONTROL DPST ALARM SILENCING SWITCH...

  • Page 19: Fig. 11-Wiring The Keyboard Display Module With

    RM7838B INSTALLATION Fig. 11—Wiring the Keyboard Display Module with Communication Interface ControlBus Module. S7800 KEYBOARD DISPLAY MODULE (MOUNTED ON 7800 SERIES RELAY MODULE) MOMENTARY PUSH BUTTON SWITCH 120 OHM RESISTOR 120 OHM RESISTOR QS7800 COMMUNICATIONS INTERFACE CONTROLBUS MODULE THREE WIRE SHIELDED CABLE MAY BE REQUIRED. TWO 120 OHM TERMINATING RESISTORS ARE REQUIRED FOR CONNECTIONS OVER 100 FEET (30 METERS).

  • Page 20: Fig. 13-Electrical Panel Installation

    RM7838B INSTALLATION MOUNTING THE RM7838B Fig. 14—Wall or burner installation. NOTE: For installation dimensions, see Figs. 1 or 2 . RELAY MODULE MOUNTING (FIGS. 13 or 14) 1. Mount the RM7838B vertically (see Figs. 11 or 12) or mount horizontally with the knife blade terminals pointing downward.

  • Page 21: Fig. 16-Keyboard Display Module Mounting

    RM7838B INSTALLATION MOUNTING KEYBOARD DISPLAY MOUNTING THE DATA CONTROLBUS MODULE (VFD) (FIG. 16) MODULE (FIG. 17) 1. Align the two interlocking ears of the Keyboard Dis- 1. Align the two interlocking ears with the two mating play Module with the two mating slots on the RM7838B. slots on the RM7838B.

  • Page 22: Display Module

    RM7838B INSTALLATION Fig. 18—Remote mounting of Keyboard Fig. 19—Flame signal amplifier mounting. Display Module. 2. Align the amplifier circuit board edge connector with the keyed receptacle on the RM7838B. Verify the amplifier nameplate faces away from the Relay Module. 3. Push in the amplifier until the circuit board is fully in- serted into the receptacle and then push the amplifier toward the RM7838B retaining clasp.

  • Page 23: Fig. 20-Flame Detector Wiring

    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 24 RM7838B OPERATION Operation Sequence of Operation 3. When the PURGE timing is complete, the RM7838B The RM7838B has the following operating sequences, commands the firing rate motor to low fire position by see Figs. 21 and 22 and Table 3. closing a circuit between terminals 13 and 14.

  • Page 25: Operation

    RM7838B OPERATION Fig. 21—Operation of the RM7838B Relay Module (not using pilot valve hold). DISPLAY INITIATE PURGE START PFEP MFEP POWER POWER POWER POWER POWER POWER POWER PILOT PILOT PILOT PILOT FLAME FLAME FLAME FLAME MAIN MAIN MAIN MAIN ALARM ALARM ALARM ALARM...

  • Page 26: Fig. 22-Operation Of The Rm7838B Relay

    RM7838B OPERATION Fig. 22—Operation of the RM7838B Relay Module (operation including pilot valve hold). 65-0120—1...

  • Page 27: Module

    RM7838B OPERATION b. Main Flame Establishing Period (MFEP) NOTE: A Shutter Check Detection System must be in place Configuration Jumper JR3 intact—RM7838B will wait to use the Pilot Valve Hold Function. Fault 46 will occur for Manual Open Valve Switch input to terminal 17 along with safety shutdown.

  • Page 28: Table 3-Sequence Status Display Information

    RM7838B OPERATION TABLE 3—SEQUENCE STATUS DISPLAY INFORMATION, SEE FIG. 23. Burner Sequence LEDs Energized INITIATE minutes:seconds POWER, PILOT, FLAME, MAIN AND ALARM selectable—message INITIATE HOLD: AC POWER, PILOT, FLAME, MAIN AND ALARM (AC Freq/Noise) INITIATE HOLD: AC POWER, PILOT, FLAME, MAIN AND ALARM (AC Line Dropout) INITIATE HOLD: AC POWER, PILOT, FLAME, MAIN AND ALARM...

  • Page 29: Fig. 24-( ◊ ) Scroll Pushbutton Function

    RM7838B OPERATION KEYBOARD FUNCTIONS The keyboard contains four pushbuttons and each has Fig. 25 (↔)—Change-Level pushbutton separate functions (SCROLL-Down, SCROLL-Up, MODE function. and Change-Level). The MODE and Change-Level func- tions, when pressed together, provide a SAVE function. 1. SCROLL Down-Up pushbuttons (◊) (see Fig. 24). The SCROLL Down-Up pushbuttons (◊) are used to scroll through the selectable messages.

  • Page 30: Table 4-Selectable Messages

    RM7838B OPERATION Fig. 26—MODE pushbutton function. Fig. 27—SAVE function. SAVE SAVE M1935A SELECTABLE MESSAGES VFD Second Line Display, Two-Level Hierarchy, see Table 4. SAVE The display values are as follows: n represents a numbered value. T represents the terminal number. M1934B x represents the suffix letter of the Relay Module.
  • Page 31 RM7838B OPERATION TABLE 4—SELECTABLE MESSAGES (Continued) Selectable Message Display Value First Line (Second Line) (Second Line) Message ◊ Fault Code ↓H3 < ◊ *fault —message*< ↓H3 ◊ sequence—message< ↓H3 ◊ (second-line-msg)< ↓H3 ◊ Fault Cycle ↓H4 nnnnn < ◊ Fault Hours ↓H4 nnnnn <...

  • Page 32: Table 5-Expanded Annunciator

    RM7838B OPERATION TABLE 5—EXPANDED ANNUNCIATOR. Selectable Message Display Value First Line (Second Line) (Second Line) Message ◊ Expanded Annun. ↔ ◊ Expanded Annunciator (EA not connected)< ◊ Current Status (CS:)± ↓EA EA Message< ◊ Valve Closure (Valve Close) ↓EA ON or OFF< ◊...

  • Page 33: Static Checkout

    RM7838B OPERATION • STATIC CHECKOUT TABLE 6—SITE CONFIGURABLE SERVICE NOTE: Clipping and removing a site-configur- JUMPER OPTIONS. able jumpers 1 and 2 enhances the level of safety. Jumper Number Description Intact Clipped Fig. 28—Selectable site-configurable jumpers. Pilot Flame 10 seconds 4 seconds Establishing Period (PFEP)

  • Page 34: Table 7-Static Checkout

    RM7838B STATIC CHECKOUT 11. Ensure normal operation is obtained for each required 12. After completing each test, be sure to remove the test test before continuing the checkout. jumper(s) TABLE 7—STATIC CHECKOUT Test Test If Operation Is Abnormal Jumpers Voltmeter Normal Operation Check The Iterms Listed Below None...
  • Page 35 RM7838B CHECKOUT Checkout • Pilot turndown test—all installations using a pilot. WARNING • Hot refractory hold-in test—all installations. • Ignition spark pickup—all installations. Do not allow fuel to accumulate in the combustion • Response to other ultraviolet sources—all installations. chamber. If fuel is allowed to enter the chamber for •...

  • Page 36: Table 8-Flame Signal

    RM7838B CHECKOUT TABLE 8—FLAME SIGNAL. Flame Flame Signal Minimum Acceptable Maximum Expected Detector Amplifier Steady dc Voltage dc Voltage Flame Rode R7847A,B 1.25 Vdc 5.0 Vdc at the Keyboard Display Module or Photocell 5.0 Vdc at a 20 kohm/voltmeter C7012A,C C7012E,F R7847C C7015A...
  • Page 37 RM7838B CHECKOUT 4. Let the sequence advance through PURGE. When SERVICE NOTE: If configuration jumper 2 is clipped, “PURGE HOLD: T21” is displayed on the Keyboard Dis- switch Run/Test Switch to TEST position. play Module VFD, press the Start button and the RM7838B will bring on the ignition and the pilot valve.
  • Page 38 RM7838B CHECKOUT INITIAL LIGHTOFF CHECK FOR DIRECT 16. Shut down the system pressing the system Stop Switch. SPARK IGNITION Make sure the burner flame goes out and make sure all This check applies to gas and oil burners not using a pilot. automatic fuel valve(s) close.

  • Page 39: Fig. 30-Flame-Out Timer Lockout

    RM7838B CHECKOUT NOTE: Low fuel pressure limits, if used, could be open. If so, period, make sure the automatic main fuel valve(s) open (if bypass them with jumpers during this test. These steps configuration jumper JR3 is clipped). Smoothly open the may require two people—one to open the manual valves manual main fuel shutoff valve(s), open the Pilot Valve and one to watch the ignition.
  • Page 40 The infrared detection system responds only NOTE: The Honeywell Q624A Solid State Spark Generator to flickering infrared radiation; it can reject a steady signal will prevent detection of ignition spark when properly from hot refractory.
  • Page 41 RM7838B CHECKOUT FLAME SIGNAL WITH HOT COMBUSTION d. The automatic pilot valve(s) should be energized CHAMBER (ALL INSTALLATIONS) but the pilot cannot ignite. When all initial start-up tests and burner adjustments are e.*Pilot Flame Fail* fault will be displayed on the completed, operate the burner until the combustion chamber VFD.

  • Page 42: Table 9-Sequence And Status Hold Messages

    RM7838B TROUBLESHOOTING Troubleshooting RM7838B SYSTEM DIAGNOSTICS DIAGNOSTIC INFORMATION INDEX Troubleshooting control system equipment failures is The RM7838B monitors input/output terminals and can made easier with the RM7838B self-diagnostics and first-out display the status of the terminal at the VFD (example: Pilot annunciation.
  • Page 43 RM7838B TROUBLESHOOTING TABLE 9—SEQUENCE AND STATUS HOLD MESSAGES (Continued) NOTE: Normal sequences are in BOLD type, while abnormal sequences are not in bold type. Sequence Message INITIATE HOLD: AC The VFD indicates the burner status, INITIATE, and that line frequency is faster (AC Frequency) than the expected value.
  • Page 44 RM7838B TROUBLESHOOTING TABLE 9—SEQUENCE AND STATUS HOLD MESSAGES (Continued) NOTE: Normal sequences are in BOLD type, while abnormal sequences are not in bold type. Sequence Message PURGE HOLD: T7 The VFD indicates the burner status, PURGE. The RM7838B commands the (Lockout ILK) combustion air fan on and provides a five second hold for the Lockout Interlock (Combustion Blower Switch) to close and stabilize.

  • Page 45: Table 10-Accessing Historical And Diagnostic Selectable Messages

    RM7838B TROUBLESHOOTING TABLE 9—SEQUENCE AND STATUS HOLD MESSAGES (Continued) NOTE: Normal sequences are in BOLD type, while abnormal sequences are not in bold type. Sequence Message BURNER OFF: T6 The VFD indicates the Burner Switch is not closed. The burner sequence will not (Burner Switch) advance to PURGE until the Burner Switch closes.
  • Page 46 RM7838B TROUBLESHOOTING TABLE 11—SELECTABLE MESSAGES (SEE TABLE 4). Selectable Message/ Possible States/Range Display Description (Terminals) Comments Flame Signal Flame signal 0 - 5.0 Vdc Flame relay pull-in and strength. Flame Amp (+ drop-out value 1.25 Vdc. and - (Com)) Total Cycles Total number 0 - 99,999 cycles A cycle will be updated...
  • Page 47 RM7838B TROUBLESHOOTING TABLE 11—SELECTABLE MESSAGES (SEE TABLE 4) (Continued) Selectable Message/ Possible States/Range Display Description (Terminals) Comments Ignition Ignition. ON or OFF Indicates if output term- inal is on (energized) or off (de-energized.) PV Hold Pilot Valve Hold ON or OFF Indicates if RM7838B is commanded to hold in Pilot.
  • Page 48 RM7838B TROUBLESHOOTING TABLE 11—SELECTABLE MESSAGES (SEE TABLE 4) (Continued) Selectable Message/ Possible States/Range Display Description (Terminals) Comments Flame Response Amplifier Flame 3s/.8 Failure Response Time (FFRT) in seconds. Purge Time Timing value mm:ss Two seconds to of purge card. 30 minutes Mfg Code Manufacturing code nnnn...

  • Page 49: Troubleshooting

    RM7838B TROUBLESHOOTING Fig. 32—Lockout message state 2. Fig. 33—Lockout message state 3. SAVE SAVE M1992A M1993A TABLE 12—HOLD AND FAULT MESSAGE SUMMARY. Annunciation Message System Failure Fault 1 *No Purge Card* No card is plugged into the purge card slot or purge card was removed during operation.
  • Page 50 RM7838B TROUBLESHOOTING TABLE 12—HOLD AND FAULT MESSAGE SUMMARY (Continued) Annunciation Message System Failure Fault 18 *Flame Detected* Flame sensed when shutter opened and no flame is expected during PURGE . Fault 19 *Main Flame Ign.* Flame was lost during MFEP or the first ten seconds of the RUN state. Fault 20 *Low Fire Sw.
  • Page 51 RM7838B TROUBLESHOOTING TABLE 12—HOLD AND FAULT MESSAGE SUMMARY (Continued) Annunciation Message System Failure Fault 49 *Man-Open Sw. On* MOS was on when it should be off. Fault 50 *Jumpers Wrong* Incorrect combination of configurable jumpers was selected. Fault 51 *Flame Too Strong* Flame signal value is too high.

  • Page 52: Table 13-Expanded Annunciator Hold Codes

    RM7838B TROUBLESHOOTING TABLE 13—EXPANDED ANNUNCIATOR HOLD CODES. Annunciation Message Symbol System Holds BURNER OFF: T6 (Burner Switch) Burner switch is open. STANDBY HOLD: T6 (Aux. Limit #1) Auxiliary limit #1 is open. STANDBY HOLD: T6 (Aux. Limit #2) Auxiliary limit #2 is open. STANDBY HOLD: T6 (LWCO) Open low water cutoff.

  • Page 53: Table 15-Expanded Annunciator Diagnostic

    RM7838B TROUBLESHOOTING TABLE 14—EXPANDED ANNUNCIATOR FAULT CODES (Continued) Annunciation Message Symbol System Faults LOCKOUT nnh *High Oil Pres.* Oil pressure was above high oil pressure limit. LOCKOUT nni *Low Oil Pres.* Oil pressure was below low oil pressure limit. LOCKOUT nnj *High Oil Temp.* Oil temperature was above high oil temperature limit.

  • Page 54: Fig. 34-Flush Mounting Of Keyboard Display Module Template

    RM7838B TROUBLESHOOTING Fig. 34—Flush mounting of Keyboard Display Module template. 1/8 DIA. (2) M5082A 65-0120—1...
  • Page 55 65-0120—1...
  • Page 56 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, MN 55422 Scarborough, Ontario M1P 2V9 QUALITY IS KEY 65-0120—1 Printed in U.S.A.

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