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65-0120—1

40

HOT REFRACTORY SATURATION TEST
(ALL INFRARED DETECTORS)

Test to make certain that radiation from hot refractory

does not mask the flickering radiation of the flame itself.

Start the burner and monitor the flame signal during the

warmup period. A decrease in signal strength as the refrac-
tory heats up indicates hot refractory saturation. If saturation
is extreme, the flame signal will drop below 1.25 Vdc and the
system will shut down as though a flame failure occurred.

If hot refractory saturation occurs, the condition must be

corrected. Add an orifice plate in front of the cell to restrict
the viewing area, lengthen the sight pipe or decrease the pipe
size (diameter). Continue adjustments until hot refractory
saturation is eliminated.

HOT REFRACTORY HOLD-IN TEST
(RECTIFYING PHOTOCELL OR ALL INFRARED
DETECTORS)

Test to make certain hot refractory will not delay the

flame detection system response to a flameout. This condi-
tion can delay response to flame failure and also can prevent
a system restart as long as hot refractory is detected.

To check rectifying photocells for hot refractory hold-in,

operate the burner until the refractory reaches its maximum
temperature. Then terminate the firing cycle by lowering the
set point of the operating controller, or set the Fuel Selector
Switch to OFF. Do not open the master switch. Visually
observe when the burner flame or FLAME LED goes out. If
this takes more than 0.8 or 3 seconds (depending on the
FFRT of the amplifier), the photocell is sensing hot refrac-
tory. This condition must be corrected as described in the last
paragraph of this test.

Infrared (lead sulfide) detectors can respond to infrared

rays emitted by a hot refractory, even when the refractory has
visibly ceased to glow. Infrared radiation from a hot refrac-
tory is steady, but radiation from a flame has a flickering
characteristic. The infrared detection system responds only
to flickering infrared radiation; it can reject a steady signal
from hot refractory. The refractory steady signal can be made
to fluctuate if it is reflected, bent or blocked by smoke or fuel
mist within the combustion chamber. Be careful when apply-
ing an infrared system to verify its response to flame only.

To check infrared (lead sulfide) detectors for hot refrac-

tory hold-in, operate the burner until the refractory reaches its
maximum temperature. If the installation has a multi-fuel
burner, burn the heavier fuel that is most likely to reflect,
bend or obscure the hot refractory steady infrared radiation.
When the maximum refractory temperature is reached, close
all manual fuel shutoff valve(s), or open the electrical circuits
of all automatic fuel valve(s). Visually observe when the
burner flame or FLAME LED goes out. If this takes more
than three seconds, the infrared detector is sensing hot refrac-
tory. Immediately terminate the firing cycle. (Lower the set
point to the operating controller, or set the Fuel Selector
Switch to OFF. Do not open the master switch.)

NOTE: Some burners continue to purge oil lines between the

valve(s) and nozzle(s) even though the fuel valve(s) are
closed. Terminating the firing cycle (instead of opening
the master switch) will allow purging the combustion
chamber. This will reduce a buildup of fuel vapors in the
combustion chamber caused by oil line purging.

If detector is sensing hot refractory, the condition must

be corrected. Add an orifice plate in front of the cell to restrict
the viewing area of the detector. If this does not correct the
problem, resight the detector at a cooler, more distant part of
the combustion chamber. While resighting the detector, be
aware that it must also properly sight the flame. For an
infrared detector,  try lengthening the sight pipe or decreas-
ing the pipe size (diameter). For details, refer to the detector
Instructions and the equipment Operating Manual. Continue
adjustments until hot refractory hold-in is eliminated.

ULTRAVIOLET SENSOR, IGNITION SPARK
RESPONSE TEST (ALL ULTRAVIOLET
DETECTORS)

Test to make certain that the ignition spark is not actuat-

ing the FLAME LED.

1. Close the pilot and main burner manual fuel shut-off

valve(s).

2. Start the burner and use the Run/Test Switch to stop

the sequence in the PILOT IGN period. Ignition spark should
occur, but the flame signal should not be more than 0.5 Vdc.

3. If the flame signal is higher than 0.5 Vdc and the

FLAME LED does come on, consult the equipment operat-
ing manual and resight the detector farther out from the
spark, or away from possible reflection. It may be necessary
to construct a barrier to block the ignition spark from the
detector view. Continue adjustments until the flame signal
due to ignition spark is less than 0.5 Vdc.

NOTE: The Honeywell Q624A Solid State Spark Generator

will prevent detection of ignition spark when properly
applied with C7027, C7035 or C7044 Minipeeper Ultra-
violet Flame Detectors. The Q624A is only for use with
gas pilots.

RESPONSE TO OTHER ULTRAVIOLET SOURCES

Some sources of artificial light such as incandescent or

fluorescent bulbs, mercury and sodium vapor lamps, pro-
duce small amounts of ultraviolet radiation. Under certain
conditions, an ultraviolet flame detector will respond to these
sources as if it is sensing a flame. To check for proper flame
detector operation, check the Flame Failure Response Time
and conduct Safety Shutdown Tests under all operating
conditions.

RM7838B

CHECKOUT

Содержание RM7838B Series

Страница 1: ...lity Communication interface capability via personal com puter utilizing MicroSoft Windows software 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 ...

Страница 2: ...e ControlBus Module 19 Fig 12 Wiring for multiple Keyboard Display Modules 19 Fig 13 Electrical panel installation 20 Fig 14 Wall or burner installation 20 Fig 15 ST7800 Purge Card installation 20 Fig 16 Keyboard Display Module mounting 21 Fig 17 DATA CONTROLBUS MODULE mounting 21 Fig 18 Remote mounting of Jkeyboard Display Module 22 Fig 19 Flame signal amplifier mounting 22 Fig 20 Flame detector ...

Страница 3: ...eralCommunicationsCommission Part15 ClassB Emissions MOUNTING Q7800A1005forpanelmountorQ7800B1003 for wall or burner mount REQUIRED COMPONENTS Plug in Flame Signal Amplifier see Table 2 Mounting Subbase Q7800A1005 for panel mounting Q7800B1003 for wall mount applications Plug in Purge Timer Cards TABLE 1 TERMINAL RATINGS Terminal No Description Ratings G Flame Sensor Ground 60 to 220 Vac current l...

Страница 4: ...maximum surface areas Wide straps or brackets are preferred rather than leadwires Be careful to ensure that mechanically tightened joints along the ground path such as pipe or conduit threads or surfaces held together with fasteners are free of nonconductive coatings and are protected against mating surface corrosion 2 2000 VA maximum connected load to RM7838B Assembly 3 Can also be 120 Vac 1A pil...

Страница 5: ...fier at least 12 times a minute during burner operation and shuts down the burner if the amplifier fails e Circuitry tests all electronic components in the flame detection system amplifier and detector 12 times a minute during burner operation and shuts down the burner if the detection system fails SEQUENCE TIMING FOR NORMAL OPERATION General Purpose Interface ControlBus Module part no QS7850A1006...

Страница 6: ...nsions of the RM7838B Relay Module and Q7800B Subbase in in mm M1984A BURNER CONTROL POWER PILOT FLAME MAIN ALARM RESET SCROLL MODE SAVE 5 127 5 127 REMOVE ONLY FOR TERMINAL TEST ACCESS 1 1 5 1 4 133 M1985A POWER PILOT FLAME MAIN ALARM RESET SCROLL MODE SAVE 5 127 5 127 BURNER CONTROL REMOVE ONLY FOR TERMINAL TEST ACCESS 1 1 6 3 32 155 ...

Страница 7: ...g 4 Rectification Detectors M5002B SCROLL MODE SAVE BURNER CONTROL 4 27 32 123 2 3 4 69 5 32 4 29 32 23 5 16 8 4 3 32 104 19 32 15 1 1 4 32 1 1 32 26 1 15 16 49 2 7 16 62 29 32 23 5 32 4 1 2 13 2 1 32 52 15 32 12 13 32 11 3 7 8 99 7 16 11 5 15 8 THREADED MOUNTING HOLES 2 10 32 UNF 1 25 FLAME ROD TARGET CERAMIC INSULATORS IGNITION ELECTRODE Q179C ONLY BRACKET M1983 3 1 8 79 1 21 32 42 1 13 32 36 3 ...

Страница 8: ... 2 38 31 32 25 4 1 8 105 1 3 16 30 C7035 COLLAR WITH 1 2 14 NPSM INTERNAL THREADS 4 102 6 FOOT 1 83 METER LEADWIRES 2 M1943A MODEL AVAILABLE WITH 24 FOOT 7 32 METER LEADWIRES MODELS AVAILABLE WITH SPUD CONNECTOR 1 2 14 NPSM INTERNAL THREADS INSTEAD OF CLAMP TYPE CONNECTOR 1 2 1 2 3 1 2 89 1 1 16 27 C7027 MOUNTING BRACKET 6 FOOT 1 83 METER LEADWIRES 2 M1944A 3 5 8 92 1 2 13 9 16 14 7 8 22 3 8 10 1 ...

Страница 9: ...2 1 4 57 2 1 4 57 4 27 32 123 1 13 32 188 10 9 32 261 2 5 16 58 29 32 23 3 4 19 1 19 32 41 2 11 16 68 7 5 8 194 Fig 5 Ultraviolet detectors Continued C7076A Fig 6 Infrared detectors APERTURE BUSHING WITH MAGNIFYING LENS COLLAR 3 4 14 NPSM INTERNAL THREADS 3 4 14 NPSM 3 4 14 NPSM INTERNAL THREADS HEAT BLOCK CELL MOUNT M1982A 2 LEADS IN A 48 INCH 1 2 METER FLEXIBLE CONDUIT 2 3 4 70 1 1 4 32 1 5 8 41...

Страница 10: ...termittent pilot valve termi nal is not energized d No flame is present at end of PFEP e Internal system fault f Purge card is not installed or removed g Purge card is bad 6 MAIN FLAME ESTABLISHING Period MFEP a Low Fire Switch opens b Lockout Interlock opens c Ignition pilot valve intermittent pilot valve termi nal is not energized d Main valve terminal is not energized e No flame is present at e...

Страница 11: ...ion trials otherwise ignition trials start after the Low Fire Switch closes The test also is used to provethatthefiringratemotorisatlowfirepositionthrough outtheignitiontrialperiod Thisswitchwillalsocauseahold four minutes 15 seconds condition if the switch opens after purging is complete The RM7838B will lockout and an nunciate an alarm if the switch fails to close within the hold time period OFF...

Страница 12: ... 19 This interlock verifies the firing rate motor is in the high purge rate position prior to and during PURGE Preignition Interlock Terminal No 20 The Preignition Interlock input is typically connected to proof of closure switches for fuel valve s The Preignition Interlock must be energized throughout STANDBY and PURGE If Preignition Interlock opens during STANDBY itcausesaholdandwilllockoutifthe...

Страница 13: ...EDBACK AND LINE VOLTAGE INPUTS LIMITS PREIGNITION INTERLOCK 1K1 2K1 5K1 8K1 8K2 9K1 9K2 120 Vac FLAME SIGNAL TEST PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED RS485 1 2 3 L1 HOT L2 4 6 7 4K1 2K2 10 8 9 7K 5K 4K 3K 2K F G 22 1 6K1 5 ALARM 3K1 3 L2 12 13 15 14 M5195A 1 RECIRCULATING BLOWER STOP SWITCH RECIRCULATING A F S COMBUSTION AIR BLOWER 16 17 18 19 20 21 COMBUSTION AIR BLOWER S...

Страница 14: ...ns 3 For surface mounting use the template see Fig 32 to mark the four screw locations Drill the pilot holes 4 Securely mount the subbase using four no 6 screws WIRING 1 For proper subbase wiring refer to Figs 8 9 or 10 For proper wiring of the Keyboard Display Module refer to Figs 9 and 10 or to the Specifications of the Keyboard Dis play Module 65 0090 Communication Interface Base Unit 63 2278 D...

Страница 15: ...el with wire as short as practical Each ground wire mustbecapableofcarryingafaultcurrentequalto the rating of the protective fuse 20A A number 14 copper conductor is adequate but wide straps or brackets are preferred rather than leadwires 6 Recommended wire routing a Flame detector leadwires 1 Do not run high voltage ignition transformer wires in the same conduit with the flame detec tor wiring 2 ...

Страница 16: ...E OR RECTIFYING FLAME ROD RECTIFYING PHOTOCELL OR INFRARED LEAD SULFIDE FLAME DETECTOR OR YELLOW WHITE WHITE L2 WHITE BLACK L1 BLACK L2 1 Q7800 SUBBASE DPST ALARM SILENCING SWITCH STOP B A START D C HIGH FIRE COMMON LOW FIRE MODULATE B R W SERIES 90 FIRING RATE MOTOR B R W SERIES 90 CONTROLLER PILOT VALVE HOLD MANUAL VALVE OPEN SWITCH LOW FIRE START SWITCH HIGH PURGE RATE SWITCH PREIGNITION INTERL...

Страница 17: ...E BLUE OR RECTIFYING FLAME ROD RECTIFYING PHOTOCELL OR INFRARED LEAD SULFIDE FLAME DETECTOR OR YELLOW WHITE WHITE L2 WHITE BLACK L1 BLACK L2 1 Q7800 SUBBASE DPST ALARM SILENCING SWITCH STOP START HIGH FIRE COMMON LOW FIRE MODULATE B R W SERIES 90 FIRING RATE MOTOR B R W SERIES 90 CONTROLLER PILOT VALVE HOLD MANUAL VALVE OPEN SWITCH LOW FIRE START SWITCH HIGH PURGE RATE SWITCH PREIGNITION INTERLOCK...

Страница 18: ...E ROD RECTIFYING PHOTOCELL OR INFRARED LEAD SULFIDE FLAME DETECTOR OR YELLOW WHITE WHITE L2 WHITE BLACK L1 BLACK L2 1 Q7800 SUBBASE DPST ALARM SILENCING SWITCH STOP START HIGH FIRE LOW FIRE COMMON MODULATE F M7284 FIRING RATE MOTOR 4 20 mA OUTPUT CONTROLLER PILOT VALVE HOLD MANUAL VALVE OPEN SWITCH LOW FIRE START SWITCH HIGH PURGE RATE SWITCH PREIGNITION INTERLOCK 5 SECOND IGNITION EARLY SPARK TER...

Страница 19: ...ELDED CABLE MAY BE REQUIRED TWO 120 OHM TERMINATING RESISTORS ARE REQUIRED FOR CONNECTING OVER 100 FEET 30 METERS CABLE SHIELD MUST BE TERMINATED TO EARTH GROUND AT BOTH ENDS IF SHIELDED CABLE IS NOT USED TWISTED PAIR WIRE MUST BE USED WHEN CONNECTING THE KEYBOARD DISPLAY MODULE DATA CONTROLBUS MODULE OR REMOTE RESET MODULE EXTERNAL FROM THE CONTROL CABINET APPROPRIATE MEASURES MUST BE TAKEN TO ME...

Страница 20: ... it does not interfere with the knife blade terminals or bifurcated contacts IMPORTANT The RM7838B must be installed with a plug in motion rather than a hinge action 4 Mount the RM7838B by aligning the four L shaped corner guides and knife blade terminals with the bifurcated contacts on the wiring subbase and tightening the two screws securely without deforming the plastic Fig 13 Electrical panel ...

Страница 21: ...on to the insertion dimension of the two Keyboard Display Module screws two interlocking ears and the two plug in connectors to allow for sufficient clearance 1 4 inch minimum inward from the surface of the door panel b Use the Keyboard Display Module as a template Mark the two screw locations two interlocking ear locations and the two plug in connector loca tions Drillthepilotholesforthemountings...

Страница 22: ...thebasisofasafeand reliableflamesafeguardinstallation Refertotheinstructions packed with the flame detector and the equipment manu facturer s instructions Keep the flame signal leadwires as short as possible from the flame detector to the wiring subbase Capacitance in creases with leadwire length reducing the signal strength The maximum permissible leadwire length depends on the type of flame dete...

Страница 23: ...UND C7076A OR C7076D TERMINAL BLOCK L2 COMMON L1 HOT G F X X FLAME ROD G F X X PHOTOCELL 1 FLAME DETECTOR LEADS ARE COLOR CODED THE BLUE LEAD MUST BE CONNECTED TO THE F TERMINAL AND THE WHITE MUST BE CONNECTED TO THE G TERMINAL THE UV SENSING TUBE IS POLARITY SENSITIVE REVERSING THE LEADS EVEN MOMENTARILY CAN DAMAGE OR DESTROY THE UV TUBE FLAME DETECTOR LEADS ARE COLOR CODED THE BLUE LEAD MUST BE ...

Страница 24: ...l not begin until the High Fire Switch closes providing input to the RM7838B terminal no 19 Four minutes 15 seconds are provided for the High Fire Switch to be closed A jumpered High Fire Switch will add 30 seconds to the PURGE timing 3 When the PURGE timing is complete the RM7838B commands the firing rate motor to low fire position by closing a circuit between terminals 13 and 14 Four minutes 15 ...

Страница 25: ...NAL 13 TO 14 TERMINAL 13 TO 14 TERM 10 TERMINAL 5 ENERGIZED COMBUSTION AIR FAN TERMINAL 7 ENERGIZED COMBUSTION AIRFLOW SWITCH TERMINAL 8 ENERGIZED J2 INTACT TERMINAL 17 FLAME PROVING TERMINAL 9 TERMINAL 8 ENERGIZED J2 CUT MAIN PILOT FLAME POWER MAIN PILOT FLAME POWER MAIN PILOT FLAME POWER M9745 2 1 2 WHEN CONFIGURATION JUMPER J3 IS CLIPPED THE RM7838B AUTOMATICALLY CONTINUES INTO THE MFEP NO WAIT...

Страница 26: ...7 ENERGIZED TERMINAL 16 ENERGIZED FLAME PROVING TERMINAL 9 TERMINAL 8 ENERGIZED J2 CUT TERMINAL 8 MAIN PILOT FLAME POWER MAIN PILOT FLAME POWER MAIN PILOT FLAME POWER MAIN PILOT FLAME POWER MAIN PILOT FLAME POWER MAIN PILOT FLAME POWER MAIN PILOT FLAME POWER MAIN PILOT FLAME POWER MAIN PILOT FLAME POWER M9744 PILOT VALVE HOLD 2 4 1 2 WHEN CONFIGURATION JUMPER J3 IS CLIPPED THE RM7838B AUTOMATICALL...

Страница 27: ...d input is present on terminal 16 6 Opening the Pilot Valve Hold input to terminal 16 will put the RM7838B ready to initiate MFEP The RM7838B will go into safety shutdown and sound the alarm if flame is lost any time during this sequence NOTE A Shutter Check Detection System must be in place to use the Pilot Valve Hold Function Fault 46 will occur along with safety shutdown KEYBOARD DISPLAY MODULE...

Страница 28: ...URGE DELAY T18 Low Fire Jumprd POWER PILOT FLAME MAIN AND ALARM PURGE HOLD F G Flame Detected POWER PILOT FLAME MAIN AND ALARM PURGE HOLD T18 Low Fire Switch POWER PILOT FLAME MAIN AND ALARM PURGE minutes seconds selectable message POWER PILOT FLAME MAIN AND ALARM PURGE HOLD T7 Lockout ILK POWER PILOT FLAME MAIN AND ALARM PURGE HOLD T21 Start Switch POWER PILOT FLAME MAIN AND ALARM PILOT IGN minut...

Страница 29: ...hierarchy of selectable messages to a subset of selectable messages The symbol located on the second line in the lower right corner of the VFD represents a first level hierarchy of selectable message The symbol lo cated on the second line in the lower right corner of the VFD represents a subset of selectable messages Fig 25 Change Level pushbutton function PILOT IGN 00 05 Fault History SCROLL MODE...

Страница 30: ...ents a numbered value T represents the terminal number x represents the suffix letter of the Relay Module TABLE 4 SELECTABLE MESSAGES Selectable Message Display Value First Line Second Line Second Line Message Flame Signal n nV Total Cycles nnnnn Total Hours nnnnn Fault History1 Fault Cycle nnnnn H1 Fault Hours nnnnn H1 Fault Code nnn H1 fault message H1 sequence message H1 second line msg H1 Faul...

Страница 31: ...al Open Valve Switch T17 ON or OFF DI LowFire Sw T18 ON or OFF DI HighFireSw T19 ON or OFF DI Preignition Interlock PreIgn ILK T20 ON or OFF DI Pilot Valve Valv Start T21 ON or OFF DI Jumper 1 INTACT or CLIPPED DI Jumper 2 INTACT or CLIPPED DI Jumper 3 INTACT or CLIPPED DI Amplifier Type Amp Type NORMAL or AMP CHECK DI or SHUTTER Flame Response 0 8s or 3s DI Purge Time mm ss DI Manufacturing Code ...

Страница 32: ...ed as follows 1 In Purge Drive To High Fire Position the Run Test switch when placed in the TEST position will hold in PURGE with the firing rate motor in the High Fire position 2 During the time measured PURGE sequence the Run Test switch when placed in the TEST position will cause the PURGE timing to stop The firing rate motor will be in the High Fire position 3 In Purge Drive to Low Fire positi...

Страница 33: ...call for heat 5 For each test open the master switch and install the jumper wire s between the subbase wiring terminals listed in the Test Jumpers column 6 Close the master switch before observing operation 7 Read the voltage between the subbase wiring termi nals listed in the Voltmeter column 8 If there is no voltage or the operation is abnormal check the circuits and external devices as describe...

Страница 34: ...en for click or feel head of valve 2 First stage valve for activation DSI applicationonly 2 Watch for spark or listen for buzz 3 Ignition spark if ignition a Ignition electrodes are clean transformer connected b Ignition transformer is okay 8 4 9 None Automatic main fuel valve s 1 Listen for and observe operation of the opens DSI check optional main fuel valve s and actuator s second stage fuel va...

Страница 35: ...th shutter check amplifiers read the average stable voltage disregardingthepeaksandvalleyscausedbytheself checking operation 6 ThemeterreadingmustbeasspecifiedinTable7 after all tests are completed and all adjustments made As an option the flame signal can be checked by using the KDM RM7838B CHECKOUT Checkout WARNING Do not allow fuel to accumulate in the combustion chamber If fuel is allowed to e...

Страница 36: ...as applicable 4 With the burner running check the temperature at de tector If it exceeds the detector maximum rated temperature Add a heat block to stop conductive heat from traveling up the sight pipe Add a shield or screen to reflect radiated heat Add cooling refer to sight pipe ventilation in the detector Instructions 6 Make sure that the flame adjustment is not too lean 7 Make sure the detecto...

Страница 37: ...s not established within twoseconds or the normal lightoff time as specified by the equipment manufacturer closethemanualmainfuelshut off valve s Whenthemainburnerflameisestablished proceedtostep13 SERVICE NOTE If configuration jumper 2 is clipped switch Run Test Switch to TEST position 10 Allow a few minutes for the combustion chamber to purge Smoothly open manual fuel shutoff valve s and try lig...

Страница 38: ... 15 15 When the first stage burner flame is established if Configuration Jumper JR2 is clipped switch the Run Test SwitchtoTEST Makeburneradjustmentsforflamestability and input rating If a second stage is used make sure the automatic second stage fuel valve s has opened 16 ShutdownthesystempressingthesystemStopSwitch Make sure the burner flame goes out and make sure all automatic fuel valve s clos...

Страница 39: ...Switch 13 Increase the pilot flame size by increasing its fuel flow until a smooth main flame can be accomplished 14 Reposition the flame scanner sight tube or use orifices until the pilot flame signal voltage is in the range of 1 25 to 1 50 Vdc 15 When the main burner lights reliably with the pilot at turndown or 1 25 Vdc flame signal strength turn up the pilot gasflowtothatrecommendedbytheequipm...

Страница 40: ...uelshutoffvalve s oropentheelectricalcircuits of all automatic fuel valve s Visually observe when the burner flame or FLAME LED goes out If this takes more thanthreeseconds theinfrareddetectorissensinghotrefrac tory Immediately terminate the firing cycle Lower the set point to the operating controller or set the Fuel Selector Switch to OFF Do not open the master switch NOTE Someburnerscontinuetopu...

Страница 41: ... displayed to denote the fault c Safety shutdown will occur 4 Failure to ignite pilot a Close the pilot and main fuel manual shutoff valve s b Depress the reset button c When purge is complete close the Start Switch d The automatic pilot valve s should be energized but the pilot cannot ignite e Pilot Flame Fail fault will be displayed on the VFD Fault code 28 will be displayed four or ten seconds ...

Страница 42: ...ll show the actual status of the terminal If voltage is detected at the terminal ON is displayed but if no voltage is detected at the terminal OFF is displayed see Table 11 HISTORICAL INFORMATION INDEX The RM7838B has nonvolatile memory that allows the RelayModuletoretainhistoricalinformationforthesixmost recent lockouts Each of the six lockout files retains the cycle when the fault occurred the h...

Страница 43: ...e seconds after the Stop Switch is pushed PURGE HOLD T19 High Fire Switch The VFD indicates the burner status PURGE and that the High Purge Rate Switch is not closed The firing rate motor is driving to its PURGE rate position If this time exceeds four minutes and 15 seconds the RM7838B will lockout PURGE DELAY T19 High Fire Jumprd The VFD indicates the burner status PURGE and that the High Fire Sw...

Страница 44: ... Open Valve Switch to terminal 17 If configuration jumper JR3 is clipped the RM7838B will go straight into the MAIN IGNITION sequence MAIN IGN mm ss The VFD indicates the burner status MAIN IGN and the timing of the MAIN IGN trial begins in minutes or seconds During this period the RM7838B permits the main valve to be open and the main flame should be established If configuration jumper JR3 is cli...

Страница 45: ...is not closed The burner sequence will not advance to PURGE until the control input closes TABLE 10 ACCESSING HISTORICAL AND DIAGNOSTIC SELECTABLE MESSAGES Step Operation Press Display Comments 1 Press scroll key STANDBY Use the up down scroll keys to access to access Diagnostic Diagnostic Info the selectable message The second Information line will display Diagnostic Information 2 Press change le...

Страница 46: ...H1 Number that identifies 0 999 lockout reason Fault Message H1 Indicates lockout cause Sequence Message H1 Indicates where lockout occurred in sequence Second Line Message H1 Explains further information avail able from RM7838B or may be blank if no pre emptive second line H2 H6 etc First level prompt for Diagnostic Information history information Has subset level Device Device type RM7838Bx numb...

Страница 47: ...s present This is momen tary input so RM7838B could be in RUN and this will read OFF Jumper 1 Pilot Flame INTACT Display shows state of Establishing Period CLIPPED PFEP jumper If jumper is PFEP intact the RM7838B will have a 10 second PFEP if jumper is clipped RM7838B will have 4 second PFEP Jumper 2 Pilot Valve INTACT Display shows state of CLIPPED Pilot Valve If jumper is intact RM7838B will hav...

Страница 48: ... STATE 3 see Fig 33 Third state display message lasts three seconds It is a replica of the burner status as it existed at the time of lockout The second line will be blank iftheburnerstatusatthetimeoflockoutdidnotincludeapre emptive message in parentheses for the second line Fig 31 Lockout message state 1 M1991B LOCKOUT 23p PURGE Airflow Sw SCROLL MODE SAVE BURNER CONTROL 4 STATE 4 Both lines are ...

Страница 49: ...rge card is plugged in or purge card value has changed since purge card was initially read Fauld 7 Flame Amplifier Flame signal was not detected when flame signal should have been present for a standard amplifier Fault 8 Flame Amp Shutr Flame signal was detected where no signal should be present for shutter check system Shutter Test Fault 9 Flame Detected Flame sensed when shutter opened and no fl...

Страница 50: ...ition Interlock fault Fault 35 Call Service Internal fault Safety relay was off when it should be on or internal fuse has blown Fault 36 Call Service Internal fault Main valve terminal was off when it should be on Fault 37 Call Service Internal fault Pilot ignition valve terminal was off when it should be on Fault 38 Call Service Internal fault Ignition terminal was off when it should be on Fault ...

Страница 51: ... Service Internal Fault Configuration jumpers differ from stored values Fault 111 Call Service Internal Fault Relay Module configuration jumper test failure Fault 112 113 114 Call Service Internal Fault Relay Module self test failure Fault 115 116 Call Service Unused Fault 117 121 Call Service Internal Fault Relay Module self test failure Fault 122 Call Service Unused Fault 123 Call Service Intern...

Страница 52: ...gh Oil Temp EA Oil temperature is above high oil temperature limit STANDBY HOLD T6 Low Oil Temp EA Oil temperature is below low oil temperature limit STANDBY HOLD T6 Atomizing Sw EA Atomizing Switch is open STANDBY HOLD T6 High Gas Pres EA Gas pressure is above high gas pressure limit STANDBY HOLD T6 Low Gas Pres EA Gas pressure is below low gas pressure limit STANDBY HOLD T6 Circuit Fault EA Cont...

Страница 53: ... nny Valve Closure EA Preignition Interlock or other valve closure switch was open LOCKOUT nnz Other PIIs EA Other Preignition Interlocks were open EXPANDED ANNUNCIATOR DIAGNOSTIC CURRENT STATUS MESSAGES TABLE 15 These message are used to provide information from the Expanded Annunciator to the Keyboard Display Module in Current Status EA Diagnostics see Table 5 This informa tionexplainsthefirstli...

Страница 54: ...65 0120 1 54 Fig 34 Flush mounting of Keyboard Display Module template RM7838B TROUBLESHOOTING M5082A 1 8 DIA 2 ...

Страница 55: ...55 65 0120 1 ...

Страница 56: ...rol 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 Printed in U S A QUALITY IS KEY ...

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