Honeywell 7800 SERIES RM7895A Manual Download Page 11 | Manualshive

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65-0086—2

Fig. 6—Internal block diagram of the RM7895 (see Figs. 7 and 8 for detailed wiring instructions).

CONFIGURATION
JUMPERS

MICROCOMPUTER

RESET
PUSHBUTTON

RUN/TEST
SWITCH

STATUS LEDs

PLUG-IN PURGE
TIMER CARD

SAFETY RELAY
CIRCUIT

POWER SUPPLY

OPTIONAL KEYBOARD
DISPLAY MODULE

PLUG-IN
FLAME
AMPLIFIER

RELAY
DRIVE
CIRCUIT

CONTROL
POWER

TEST
JACK

REMOTE
RESET

DDL

DDL
COMMUNICATIONS

INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS

FIELD WIRING
INTERNAL WIRING

IGNITION

PILOT

DELAYED
MAIN VALVE

MAIN VALVE

1K

RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS

LIMITS CONTROLLER

AIRFLOW
INTERLOCK

1K1

2K1 5K1

120 Vac

FLAME SIGNAL

TEST

PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

RS485

1

2

3

L1
(HOT)

L2

5

6

7

4K1

7K1

2K2

10

8

21

9

7K

6K

5K

4K

3K

2K

F

G

22

1

BLOWER

6K1

4

ALARM

3K1

3

L2

1

M5110B

RM7895A,B,C,D

INSTALLATION

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Summary of Contents for 7800 SERIES RM7895A

Page 1: ...d on the optional Keyboard Display Module optional First out expanded annunciation with 26 Light Emitting Diodes LEDs for limits and interlocks optional Five LEDs for sequence information Two function Run Test Switch RM7895C D Interchangeable plug in flame amplifiers Local or remote annunciation of RM7895 operation and fault information Nonvolatile memory RM7895 retains history files and sequencin...

Page 2: ...than leadwires are preferred Be careful to verify 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 3 2000 VA maximum connected load to RM7895 Assembly 4 Can also be 120 Vac 1A pilot duty 5 Can also be 65 VA pilot duty with motorized ...

Page 3: ...CHECK Blue Dynamic R7886Ae 3 sec Gas oil Ultraviolet C7076 Self coal Adjustable Check Sensitivity a Order flame rod separately see holder Instructions b Use only Honeywell Photocell part no 38316 c 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 continuously for twenty f...

Page 4: ...ssociation certified LR9S329 3 Factory Mutual approved International Approval Services formerly AGA Report no C2030002 IRI acceptable FederalCommunicationsCommission Part15 ClassB Emissions MOUNTING Q7800A for panel mount or Q7800B for wall or burner mount REQUIRED COMPONENTS Plug in Flame Signal Amplifier see Table 2 Plug in Purge Timer Cards selectable ST7800A two seconds to 30 minutes Q7800A or...

Page 5: ...CESS 1 1 Fig 2 Mounting dimensions of RM7895 Relay Module and Q7800B Subbase in inches millimeters Fig 3 Rectification detectors 1 32 1 4 1 45 3 4 21 13 16 1 35 3 8 1 33 5 16 5 16 8 1 32 1 4 2 51 C7013A C7014A M1847 THREADED MOUNTING HOLES 2 10 32 UNF 13 1 2 1 25 FLAME ROD 18 11 16 3 8 10 2 3 32 20 25 32 20 25 32 14 17 32 TARGET 2 62 25 32 1 27 1 16 1 36 13 32 1 42 21 32 3 79 1 8 CERAMIC INSULATOR...

Page 6: ...RNAL THREADS 4 105 1 8 2 1 30 3 16 2 51 COLLAR WITH 1 11 1 2 NPSM INTERNAL THREADS 1 1 DIN APPROVED C7035A1064 HAS 1 11 BSP P1 INTERNAL THREADS DIN APPROVED C7035A1064 HAS 1 2 14 BSP F INTERNAL THREADS MODEL AVAILABLE WITH 12 FOOT 3 66 METER LEADWIRES 2 67 5 8 2 3 INSERTION DEPTH 6 FOOT 1 83 METER LEADWIRES 2 3 M1945A RM7895A B C D SPECIFICATIONS C7076A 4 123 4 102 27 32 1 27 1 16 2 57 1 4 4 102 2...

Page 7: ...5 1 INCH NPT 15 16 18 UNC 2 EACH 2 55 5 32 1 47 27 32 11 300 13 16 5 147 13 16 5 147 13 16 M5084 Fig 5 Infrared detector 1 32 1 4 2 70 3 4 APERTURE BUSHING WITH MAGNIFYING LENS COLLAR 3 4 14 NPSM INTERNAL THREADS 3 4 14 NPSM 3 4 14 NPSM INTERNAL THREADS 1 32 1 4 1 27 1 16 1 41 5 8 HEAT BLOCK CELL MOUNT M1982A 2 LEADS IN A 48 INCH 1 2 METER FLEXIBLE CONDUIT ...

Page 8: ...ittent pilot valve ter minal is energized d Main valve terminal is energized e Delayed main valve terminal is energized RM7895C D f Internal system fault occurred g Purge card is removed h Purge card is bad 4 PILOTFLAMEESTABLISHINGPERIOD PFEP a Airflow lockout feature is enabled and the air flow switch opens b Ignition pilot valve terminal is not energized c No flame present at end of PFEP d Main ...

Page 9: ... energized EXPANDED SAFE START CHECK Theconventionalsafe startcheck whichpreventsburner start upifflameisindicatedatstart up isexpandedtoinclude a flame signal check during STANDBY an airflow switch check and a safety critical load check OFF CYCLE Standby or Prepurge FLAME SIGNAL CHECK Theflamedetectionsubsystem flamedetectorandampli fier is monitored during STANDBY If a flame simulating condition...

Page 10: ...ratus does not exceed the Class B limitsforradionoiseofdigitalapparatussetoutinthe Radio Interference Regulations of the Canadian De partment of Communications HUMIDITY Install the RM7895 where the relative humidity never reaches the saturation point The RM7895 is designed to operateinamaximum85 RHcontinuous noncondensing moisture environment Condensing moisture may cause a safety shutdown VIBRATI...

Page 11: ...TROL POWER TEST JACK REMOTE RESET DDL DDL COMMUNICATIONS INDICATES FEEDBACK SENSING TO RELAY STATUS FEEDBACK AND LINE VOLT INPUTS FIELD WIRING INTERNAL WIRING IGNITION PILOT DELAYED MAIN VALVE MAIN VALVE 1K RELAY STATUS FEEDBACK AND LINE VOLTAGE INPUTS LIMITS CONTROLLER AIRFLOW INTERLOCK 1K1 2K1 5K1 120 Vac FLAME SIGNAL TEST PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED RS485 1 2 3 ...

Page 12: ...lt current equal to 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 for flame detector leadwires 1 Do not run high voltage ignition transformer wires inthesameconduitwiththeflamedetectionwiring 2 Do not route scanner wires in a conduit with line voltage circuits 3 Enclose scann...

Page 13: ...FRA RED LEAD SULFIDE FLAME DETECTOR C7027A C7035A OR C7044A ULTRAVIOLET FLAME DETECTOR C7012A C E F OR C7076A D ULTRAVIOLET FLAME DETECTOR 120V 60 Hz POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS FOR DIRECT SPARK IGNITION OIL OR GAS IGNITION TRANSFORMER MAIN VALVE L1 HOT L2 1 OR OR BLUE BLUE WHITE YELLOW L2 WHITE WHITE BLACK ...

Page 14: ... PHOTOCELL OR INFRA RED LEAD SULFIDE FLAME DETECTOR C7027A C7035A OR C7044A ULTRAVIOLET FLAME DETECTOR C7012A C E F OR C7076A D ULTRAVIOLET FLAME DETECTOR 120V 60 Hz POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS FOR DIRECT SPARK IGNITION OIL OR GAS IGNITION TRANSFORMER MAIN VALVE L1 HOT L2 1 OR OR BLUE BLUE WHITE YELLOW L2 WH...

Page 15: ...oltage probes c AllowanoptionaltwoinchesabovetheRM7895C D for access to the Run Test Switch 3 Make sure no subbase wiring is projecting beyond the terminal blocks Tuck wiring in against the back of the subbase so it does not interfere with the knife blade termi nals or bifurcated contacts 4 Mount the RM7895 by aligning the four L shaped corner guides and knife blade terminals with the bifurcated c...

Page 16: ...connect the power supply before beginning instal lation to prevent electrical shock and equipment damage More than one disconnect may be involved 2 Align the amplifier circuit board edge connector with the keyed receptacle on the RM7895 Ensure the amplifier nameplate faces away from the Relay Module see Fig 13 3 Push in the amplifier until the circuit board is fully inserted into the receptacle an...

Page 17: ...ERMINAL 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 CONNECTED TO THE F TER...

Page 18: ...plied and the RM7895 operating control indicating a call for heat a AirflowInterlock burnerswitch Run TestSwitchand all microcomputer monitored circuits must be in the correct operating state b The blower motor output terminal 4 is powered to start the PREPURGE sequence c The Airflow Interlock input must close ten seconds in PREPURGE or within the specified purge card timing otherwise a recycle to...

Page 19: ... POWER PURGE PILOT FLAME MAIN PILOT IGNITION PURGE HOLD F G FLAME DETECTED ALARM POWER FLAME MAIN PILOT ALARM ALARM POWER FLAME MAIN PILOT ALARM POWER FLAME MAIN PILOT ALARM POWER FLAME MAIN PILOT ALARM POWER FLAME MAIN PILOT ALARM POWER FLAME MAIN PILOT ALARM POWER FLAME MAIN PILOT ALARM POWER FLAME MAIN PILOT ALARM RESET ALARM RUN RM7895C D INTERRUP TED PILOT RUN RM7895A B INTERMIT TENT PILOT MA...

Page 20: ...tors removed from the Relay Module TABLE 3 SITE CONFIGURABLE JUMPER OPTIONS Jumper Number Description Intact Clipped RM7895 Type JR1a Pilot Flame Establishing Period 10 seconds 4 seconds ALL JR2 Flame Failure Action Recycle Lockout ALL JR3 Airflow Switch ILK Failure Recycle Lockout ALL a The RM7895C1020 has a fixed pilot flame establishing period of ten seconds The model does not have jumper JR1 F...

Page 21: ...g Static Tests if required 1 All None 5 L2 Line voltage at terminal 5 1 Master switch 2 Power connected to the master switch 3 Overload protection fuse circuit breaker has not opened the power line 2 All None 6 L2 Line voltage at terminal 6 1 Limits 2 Burner controller 3 All 4 5 7 L2 1 Burner motor fan or blower 1 Burner motor circuit starts a Manual switch of burner motor 2 Line voltage at termin...

Page 22: ...ton only if the RM7895 is powered see Figs 1 and 2 9 Run Test Switch is in RUN position RM7895C D 10 System is in the STANDBY condition POWER LED is energized 11 All limits and interlocks are reset Checkout WARNING Do not allow fuel to accumulate in the combus tion chamber If fuel is allowed to enter the chamber for longer than a few seconds without igniting an explosive mixture could result It is...

Page 23: ...ined before completing checkout b The flame amplifiers are AMPLI CHECK type c The flame signal amplifier circuitry is tested one half second every five seconds during burner operation and shuts down the burner if the amplifier fails all installations Fig 20 Flame signal measurement If the signal is unstable or less than the minimum ac ceptable voltage check the flame detector installation and circ...

Page 24: ...k for adequate bleeding of the fuel line l Reinstall the RM7895 on the subbase and close the master switch then return to step 4 7 When pilot ignites measure the flame signal If the pilot flame signal is unsteady or approaching the 1 25 Vdc minimum value adjust the pilot flame size or detector sighting to provide a maximum and steady flame signal 8 Recycle the system to recheck lightoff and pilot ...

Page 25: ...ility and input rating If a second stage is used proceed to step 18 16 Shutdownthesystembyopeningtheburnerswitchor by lowering the set point of the operating controller Make sure the burner flame goes out and make sure all automatic fuel valve s close 17 If used remove the bypass jumpers from the low fuel pressure limit and subbase 18 If a second stage is used make sure the automatic second stage ...

Page 26: ...pped at this point the RM7895 will lockout 9 Repeat step 8 to verify the pilot gas pressure reading at the exact point the FLAME LED light goes out 10 Increase the pilot pressure immediately until the FLAME LED comes on and then turn it down slowly to obtain a pressure reading just above the dropout point NOTE Step 11 requires two people one to open the manual valve s and one to watch for ignition...

Page 27: ...l that is most likely to reflect bend or obscure the hot refrac tory 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 sens ing hot refractory Immedi...

Page 28: ...own will occur 5 Failure to ignite main a Openthemanualpilotvalve s leavethemainfuel manual shutoff valve s closed b Depress the reset push button c Start the system d Pilot should ignite and the flame signal should be at least 1 25 Vdc but the main burner cannot light e Close the manual pilot valve s f Flame signal should drop below 1 25 Vdc within 8 or 3 seconds depending on the FFRT of the ampl...

Page 29: ...condition SERVICE NOTE Remove the access slot covers on the sides of the Q7800A B to check voltages CAUTION Reinstall access slot covers on the Q7800A B Subbase after performing voltage checks SERVICE NOTE Maximum ambient operating tem perature of a C7012E F Series 1 through 6 will be reduced to 125 F because of the duty cycle operation of the RM7895 Relay Module TABLE 6 SEQUENCE AND STATUS HOLD I...

Page 30: ... HOLD TEST Run Test Switch The LED indicates the burner status POWER and that the Run Test Switch is in the TEST position The sequence will not continue until the Run Test Switch is placed in the RUN position RM7895C D PURGE HOLD F G Flame Detected The LEDs indicate the burner status POWER and FLAME and that a flame is detected The burner sequence will not advance through PREPURGE because a flame ...

Page 31: ... and before the operating controller set point is reached During this time the burner is firing under the control of the operating control ler RM7895C D RESET ALARM TEST The LED indicates the burner status POWER and ALARM This condition indicates the reset push button is pressed If it is held for more than four seconds the alarm output is energized The alarm output will be de energized after the r...

Page 32: ...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 Printed in U S A QUALITY IS KEY ...

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