Honeywell S8701 User's Manual
Contents
1. 8701 S8702 Table 5 Recommended ____Table5 Recommended Ignition Cable Cable Temperature RMS Rating Cable Type Voltage Rating UL Style 3257 10 000 r 482 289 Wiring the S8701 S8702 Control 1 Connect system components to the S8701 S8702 terminals as shown in the wiring diagrams Figs 2 and 3 Refer to the appliance manufacturer s instructions for wiring any other auxiliary controls 2 Adjust temperature control heat anticipator to match system current draw The current draw equals the total current required for the S8701 or S8702 0 15A plus the gas valve and all other 24 V control loads vent dampers prepurge relays etc Gas valve must be designed for the DSI application NOTE Use only recommended ignition cable see Table 5 to connect the S8701 S8702 with the spark igniter Cable must not run in continuous contact with a metal surface or spark voltage will be greatly reduced use ceramic standoff brackets if necessary Cable length must not exceed 6 ft 1 8m LO p LIMIT CONTROLLER m 1 ro u 12 TRANSFORMER 8701D CONTROL MODULE FLAME E SENSI a n ALARM IF USED Flo j VALVE GND ALARM oN o Fs 24 Vac GND VALVE 24 Vac o 1 ANY COMBINATION GAS CONTROL 2 0 0347 SPARK Q32. perform a safe start check that determines proper operation of the control before beginning the normal sequence of operation Once the Safe Start Check operation passes the control turns on the spark circuit and at the same time the S8701 S8702 opens the gas control s main valves which allows gas to flow to the main burner Power is supplied to the generator until The main burner s lights and the flame sensor current reaches 1 0 pA The ignition activation period ends If the main burner lights a flame sensing circuit is com pleted through the flame to the burner head to ground This current flow sets the Trial for Ignition timer to the reset normal condition and interrupts the spark ignition circuit flame sense must occur on both burners on a S8702 Should the current flow be interrupted i e flame out condition the trial for ignition period begins again The S8701 S8702 will keep the gas control main valve open as long as there is a request for heat and flame current through the flame sensing circuit If however the trial for ignition timing period ends before the main burner lights or the flame sensor establishes enough current the system will go into safety lockout or interpurge if the control is an F or M model When the system goes into safety lockout power to the spark generator is interrupted the power to the gas valve is interrupted and the alarm circuit is completed and the LED is steady on The sy
3. 54 FLAME SENSOR TEMPERATURE CONTOLLER BURNER IGNITER AND BURNER GROUND POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A ALTERNATE LIMIT CONTROLLER LOCATION A MAXIMUM IGNITER SENSOR CABLE LENGTH 6 FT 1 8 M OR LESS 16232 Fig 2 58701 Wiring Diagram 69 1174 S8701 S8702 DIRECT SPARK IGNITION CONTROLS LIMIT CONTROLLER gt A F L2 TRANSFORMER 587020 CONTROL MODULE SENSE 2 SENSE 1 o ALARM IF USED GND VALVE GND ALARM 24Vac GND VALVE 24 Vac o ANY COMBINATION GAS CONTROL 2 0A MAX BURNER SPARK2 GND SPARK 1 Q347 SPARK IGNITER Q354 FLAME SENSOR A TEMPERATURE CONTOLLER BURNER IGNITER AND BURNER GROUND 0354 FLAME Q347 SPARK IGNITER SENSOR A BURNER IGNITER AND BURNER GROUND POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A ALTERNATE LIMIT CONTROLLER LOCATION A MAXIMUM IGNITER SENSOR CABLE LENGTH 6 FT 1 8 M OR LESS 16267 Fig 3 58702 Wiring Diagram Grounding the S8701 S8702 Spark Igniter and Main Burner For the system to operate properly spark igniter flame sensor bracket the burner GND terminal on the 24V GND terminal and the S8701 S8702 control must share a comm
4. D BURNER GROUND WIRES CHECK THAT BURNER FLAME COVERS ALL ELECTRODES ON BOTH BURNERS IF S8702 CHECK 24V GROUND CONNECTION TO BURNER IF CHECKS ARE OKAY REPLACE UNIT YES NOTE IF UNIT GOES INTO LOCKOUT RESET SYSTEM SYSTEM RUNS UNTIL CALL FOR HEAT ENDS CHECK CONTINUITY OF SENSOR CABLE S AND GROUND WIRES NOTE IF GROUND IS POOR OR ERRATIC SHUTDOWNS MAY OCCUR OCCASIONALLY EVEN THOUGH OPERATION IS NORMAL AT TIME OF CHECKOUT CHECK FOR EXCESSIVE HEAT AT SENSOR INSULATOR S TEMPERATURE ABOVE 1000 F 538 C CAUSES SHORT TO GROUND IF CHECKS ARE OKAY REPLACE UNIT CHECK FOR PROPER TEMPERATURE CONTROLLER OPERATION CALL FOR HEAT ENDS REMOVE VALVE LEAD AR UNIT IF VALVE CLOSES RECHECK TEMPERATURE SYSTEM SHUTS OFF CONTROLLER AND WIRING IF NOT REPLACE GAS CONTROL REPEAT PROCEDURE UNTIL TROUBLE FREE OPERATION IS OBTAINED NOTES B D J AND K MODELS GO THROUGH ONE 1 TRIAL FOR IGNITION PERIOD BEFORE LOCKOUT E F L AND M MODELS GO THROUGH THREE 3 TRIAL FOR IGNITION PERIODS WITH A 30 SECOND INTERPURGE PERIOD BETWEEN TRIAL FOR IGNITION PERIODS BEFORE LOCKOUT AND THEN RETRY AUTOMATICALLY AFTER ONE 1 HOUR LOCKOUT VALVE CLOSED PLUS SPARK OFF PLUS ALARM ACTIVATED PLUS LED ON STEADY 8702 MODELS SPARK AND SENSE FLAME ON TWO SEPARATE BURNERS FLAME MUST BE SENSED ON BOTH BURNERS DURING TRIAL FOR IGNITION ON THE UNIT WILL LOCKOUT M18059 Fig 9 S8701 S8702 Direct Spark Ignition System Troubleshooting G
5. DIRECT SPARK IGNITION CONTROLS START NOTE BEFORE TROUBLESHOOTING FAMILIARIZE YOURSELF WITH THE START UP AND CHECKOUT PROCEDURE TURN THERMOSTAT TO CALL FOR HEAT TURN GAS SUPPLY OFF CHECK LINE VOLTAGE POWER LOW VOLTAGE TRANSFORMER LIMIT CONTROLLERS POWER TO UNIT THERMOSTATS AND WIRING ALSO AIR PROVING SWITCH ON PREPURGE 24 VAC NOMINAL SYSTEMS SEE FIGS 4 AND 5 YES 8 UNIT LOCKS OUT ON POWER UP CHECK FOR FLAME AT EACH BURNER IF FLAME SARE START IS PRESENT SHUT OFF GAS SUPPLY AND REPLACE GAS CONTROL IF NOT REPLACE IGNITION CONTROL J K L AND MODELS SAE PURGE DELAY NO PREPURGE DELAY REPLACE J K L OR M UNIT YES PULL IGNITION LEAD SPARK ACROSS IGNITER OR AND CHECK SPARK AT IGNITER SENSOR GAP SPARK TERMINALS TURN OFF GAS SUPPLY SPARK OKAY REPLACE UNIT YES CHECK IGNITION CABLE BURNER GROUND WIRING CERAMIC INSULATOR AND GAP AND CORRECT CHECK BOOT OF THE IGNITION CABLE FOR SIGNS OF MELTING OR BUCKLING TAKE PROTECTIVE ACTION TO SHIELD CABLE AND BOOT FROM EXCESSIVE TEMPERATURES CHECK FOR 24 VAC ACROSS VALVE AND VALVE TERMINALS DURING TRIAL FOR MAIN BURNER S LIGHTS IGNITION PERIOD IF NO VOLTAGE REPLACE UNIT Q347 Q354 OR Q366 MAY BE OUT OF POSITION CHECK ELECTRICAL CONNECTIONS BETWEEN UNIT AND GAS CONTROL IF OKAY REPLACE GAS CONTROL NO NOTE IF UNIT GOES INTO LOCKOUT RESET SYSTEM SPARK STOPS WHEN BURNER IS LIT CHECK CONTINUITY OF SENSOR CABLE S AN
6. Honeywell S8701 S8702 Direct Spark APPLICATION S8701 and S8702 Direct Spark Ignition Controls are designed for use in commercial cooking and other gas heating applications which require direct ignition and flame safety control of gas burners S8701 S8702 controls are used to ignite the main burner s sense the flame and control the gas valve in these applications see Table 1 Ignition Controls INSTALLATION INSTRUCTIONS The S8701 is a single spark single flame sense direct ignition control that is compatible with dual rod systems The S8702 is a dual spark dual flame sense direct ignition control capable of igniting and sensing flame on two separate gas burners that are fed by a single gas valve The S8702 is compatible with dual rod systems only Table 1 S8701 S8702 Models Ss702F ed 1 1 1 aS8702 F models include an auto reset from lockout after 1 hour Planning the Installation A WARNING Fire or Explosion Hazard Can cause property damage severe injury or death Follow these warnings exactly 1 Plan the installation as outlined below 2 Plan for frequent maintenance as described the Maintenance section Review the following conditions that can apply to your specific installation and take the precautionary steps suggested Frequent Cycling This control is designed for use on commercial cooking appliances tha
7. IS INTERRUPTED VALVES CLOSE DURING NORMAL OPERATION LED BLINKS ONCE PER SECOND END MAIN BURNER S ARE OFF q NOTES E F L AND M MODELS GO THROUGH THREE 3 TRIAL FOR IGNITION PERIODS WITH A 30 SECOND INTERPURGE PERIOD BETWEEN TRIAL FOR IGNITION PERIODS BEFORE LOCKOUT AND THEN RETRY AUTOMATICALLY AFTER ONE 1 HOUR LOCKOUT VALVE CLOSED PLUS SPARK OFF PLUS ALARM ACTIVATED PLUS LED ON STEADY PLUS ONE 1 HOUR AUTO RESET TIMER ACTIVATED M18057 Fig 5 S8701 S8702 Sequence of Operation for Retry Models E F L and M Models SERVICE Preliminary Check The following checks should be made before troubleshoot IMPORTANT ing the system 1 Only persons trained and experienced in DSI 1 Check for power to the heating appliance and the systems should service this equipment 58701 S8702 Voltage to the control should be 2 If a condition exists that causes the S8701 or between 20 5 and 28 5 Vac when in run mode 58702 control to go into safety lockout meter 2 Make certain that the manual shut off valve in the readings must be taken quickly after restart supply line and the gas cock knob on the combina within the Trial for Ignition period tion gas control valve are open 3 Always de energize the system for at least 5 3 Make certain that all wiring connections are clean d tight seconds before recycling for further tests A 4 Always turn off gas supply before performing 4 Make certain that the S8701 or S8702 is no
8. K IGNITION CONTROLS Heat Excessively high temperatures can damage the control Make sure the maximum ambient temperature at the control does not exceed the rating of the control see Table 2 If the appliance operates at very high temperatures use insulation shielding and air circulation as necessary to protect the control Proper insulation or shielding should be provided by the appliance manufacturer verify proper air circulation is maintained when the appliance is installed Table 2 S8701 S8702 Ambient Temperature Ratings Ambient Temperature Table 3 System Requirements Model Spark Flame Valve Required No Igniter Sensor 8701 Q347A Q354A Honeywell VR8205 58702 03660 gas valves or equivalent Valve used must be designed for DSI application b Separate spark igniter and flame sensor mounted on a common bracket INSTALLATION When Installing this Product 1 Read these instructions carefully Failure to follow them could damage the product or cause a hazard ous condition 2 Check the ratings given in the instructions and on the product to make sure it is suitable for your application 3 The installer must be a trained experienced service technician 4 After installation is complete check out system operation A WARNING Fire or Explosion Hazard Can cause property damage severe injury or death If a new gas control is to be installed turn off gas supply before star
9. LED BLINKS ONCE PER SECOND MAIN BURNER S ARE OFF NOTES B D J AND K MODELS GO THROUGH ONE 1 TRIAL FOR IGNITION PERIOD BEFORE LOCKOUT LOCKOUT VALVE CLOSED PLUS SPARK OFF PLUS ALARM ACTIVATED PLUS LED ON STEADY M18058 Fig 4 S8701 S8702 Sequence of Operation for 1 Trial Models B D J and K Models 69 1174 S8701 S8702 DIRECT SPARK IGNITION CONTROLS THERMOSTAT CALLS FOR HEAT e PREPURGE L amp M MODELS ONLY PREPURGE L AND M MODELS ONLY INTERPURGE IF NO SPARK E F L AND M MODELS GO INTO LOCKOUT TRIAL FOR IGNITION SPARK GENERATOR POWERED AFTER THREE 3 TRIAL FORIGNITION PERIODS SPAK GENERATOR POWERED ALARM CIRCUIT IS ACTIVATED LED IS ON STEADY SYSTEM WILL AUTOMATICALLY RETRY AFTER ONE 1 HOUR q IF FLAME CURRENT SENSED IF FLAME CURRENT IS NOT SENSED MUST BE SENSED AT BOTH SPARK GENERATOR AND MAIN VALVE OFF GOTO BURNERS ON 8702 INTERPURGE E F L AND M MODELS GO INTO LOCKOUT SPARK GENERATOR IS SHUT OFF AFTER THREE 3 TRIAL FOR IGNITION PERIODS SYSTEM LOCKOUT TIMER IS RESET WILL AUTOMATICALLY RETRY AFTER ONE 1 HOUR LED IS ON STEADY q MAIN BURNER OPERATION MAIN BURNER OPERATION LOSS OF FLAME UNIT MONITORS BURNER SPARK GENERATOR IS POWERED FLAME CURRENT F L AND M MODELS GO INTO LOCKOUT AFTER THREE 3 TRIAL FOR IGNITION PERIODS LED IS ON STEADY SYSTEM WILL AUTOMATICALLY RETRY AFTER ONE 1 HOUR TEMPERATURE CONTROLLER IS SATISFIED POWER TO UNIT
10. both 58702 spark terminals to isolate the circuit from the spark igniter or igniter sensor Prepare a short jumper lead using heavily insulated wire such as ignition cable A WARNING High Voltage Can cause personal injury or death To prevent electric shock do not allow fingers to touch either the stripped end of the jumper or the stud terminal 3 Perform this test immediately upon energizing the system before the 58701 S8702 goes into lockout and interrupts the spark circuit Touch one end jumper firmly to the S8701 S8702 GND terminal Do not remove the existing ground lead Slowly move the other end of the jumper wire toward the spark terminal on the control to establish a spark Pull the wire away from the spark terminal and note the length of the gap at which spark discontinues 4 A spark length of 1 8 inch 3 mm or more indicates satisfactory voltage output If no arc can be estab lished or the maximum spark is less than 1 8 inch 3 mm and power to the S8701 or S8702 input terminals was proved replace the S8701 S8702 Ignition Cable Check the electrical continuity of the ignition cable and make certain the cable is not in contact with metal surfaces The total cable length should not exceed 6 ft 1 8 m Check connection to the spark terminal on the 58701 58702 and the boot connection to the igniter sensor Make certain they are clean and tight Grounding Connections ground is required for
11. ng is less than 1 0 or unsteady see LOW OR UNSTEADY FLAME CURRENT section below If flame is present at sensor and a reading of OA is obtained check for a secondary ground connection to the 24 V GND terminal FLAME SENSOR BURNER 1 2 pA de MINIMUM AND STEADY MULTIPURPOSE METER BLACK RED M16236A Fig 6 S8701 Flame Current Measurement FLAME SENSOR SENSE 2 BURNER 28 ND 1 2 pA dc MINIMUM VALVE GND AND STEADY 24 Vac IEND 24 vac MULTIPURPOSE METER ijoj BURNER GND M16268A Fig 7 S8702 Flame Current Measurement See also 58701 Fig 4 S8701 S8702 DIRECT SPARK IGNITION CONTROLS Low or Unsteady Flame Current If the current to the S8701 S8702 is less than 1 0 uA or is unsteady check the burner flame flame sensor location and electrical connections as follows Burner Flame The flame sensor must be constantly immersed in flame Check burner flame conditions as shown in Fig 8 Flame Sensor The flame signal is best when about 1 inch 25 mm of flame rod is immersed in the burner flame A bent flame rod bent mounting bracket or cracked ceramic insulator can affect flame signal Replace flame sensor if necessary Electrical Connections and Shorts Connections at the flame sensor must be clean and tight If wiring needs replacement use moisture resistant no 18 AWG wire rated f
12. on ground with the main burner Use thermoplastic insulated wire with a minimum rating of 105 C 221 F for the ground wire asbestos insulation is not acceptable If necessary use a shield to protect the wire from radiant heat generated by the burner IMPORTANT Use moisture resistant 18 AWG wire rated for continuous duty up to 105 C 221 F Connec tions must be clean and tight Connect the ground wire as follows 1 Fit one end of the ground wire with a female 1 4 in quick connect terminal and connect it to the male quick connect GND Burner terminal on the S8701 8702 control 2 Strip the other end of the GND Burner wire and fasten it under the igniter bracket mounting screw If necessary use a shield to protect the wire from radiant heat The burner serves as the common grounding area 69 1174 3 Fit one end of another ground wire with a female 1 4 in quick connect terminal and connect it to the male quick connect 24V GND terminal on the S8701 8702 control 4 Strip the other end of the 24V GND wire and fasten it to the burner ground 5 If used with a separate flame sensor make sure the bracket is connected to the burner ground NOTE Itis not necessary that the burner is earth grounded STARTUP AND CHECKOUT The following start up and checkout procedures are basic to all S8701 and S8702 control modules If this is a replacement application refer to the specific instructions provided by the heating a
13. or continuous duty up to 105 C 221 F CHECK BURNER FLAME CONDITION NOISY LIFTING FLAME CHECK FOR Hp HIGH GAS PRESSURE HF EXCESS PRIMARY AIR OR DRAFT BURNER WAVING FLAME UENS TOS CHECK FOR CE POOR DRAFT EXCESS DRAFT HIGH VELOCITY OR SECONDARY AIR INSTALL SHIELD IF NECESSARY SMALL BLUE FLAME Bi CLOGGED PORTS OR ORIFICE FILTER LAZY YELLOW FLAME CHECK FOR I Bi LACK OF AIR FROM DIRTY PRIMARY AIR OPENING LARGE PORTS CHECK FOR a WRONG SIZE ORIFICE OR ORIFICES GOOD RECTIFYING FLAME 1 IN 25 4 MM f 1 4 TO 1 2 IN 6 4 TO 12 7 MM M18055 Fig 8 Check Burner Flame Conditions Checkout After Service Perform the following steps before leaving the job de scribed in the CHECKOUT section e START SYSTEM TRIAL FOR IGNITION PERIOD CHECK e SAFETY LOCKOUT RESET Also perform any other checks recommended by the heating appliance manufacturer if system components other than the S8701 or S8702 were serviced TROUBLESHOOTING GUIDE Start the system by setting the thermostat or temperature control to call for heat Observe the system response and establish the type of malfunction or deviation from normal operation by using the troubleshooting guide After any maintenance or repair the troubleshooting sequence should be repeated until normal system operation is obtained 69 1174 S8701 S8702
14. ppliance manufacturer if available Also since the auxiliary controls used on any DSI system may differ refer to the manufacturer s instructions for start up and checkout procedures for other system components NOTE If one of the system components fail the S8701 8702 will either not operate or it will go into safety lockout depending on the type of failure If the system does not perform as outlined in Start System and Check Trial for Ignition steps below refer to the SERVICE section to deter mine the cause Gas Leak Test If the gas control has been replaced as a part of the S8701 or 58702 installation perform the following test for gas leaks A WARNING Fire or Explosion Hazard Can cause property damage severe injury or death To avoid possible explosion or fire perform Gas Leak Test With the main burner in operation paint the pipe joints and valve gasket with a rich soap and water solution Bubbles indicate a gas leak To stop leak tighten joints and screws or replace the gasket Never use a flame to check for gas leaks START SYSTEM 1 Turn on the power and the gas supply Set the temperature control to request heat and watch for a spark at the igniter S8701D S8702D models have no delay on start up S8702K and M models have a predetermined delay on start up for prepurge Time the length of the spark operation it must be within the Trial for Ignition TFI timing period see Table 6 2 Check that
15. rent and the gas valve current Table 4 shows the transformer rating necessary for various loads S8701 S8702 DIRECT SPARK IGNITION CONTROLS Table 4 Transformer Ratings for S8701 S8702 and Dual Valve Combination Gas Controls Minimum VA Total Valve Rating 24V Current S8701 S8702 transformer in amperes in amperes Wiring General Precautions 1 Check the wiring diagram furnished by the heating appliance manufacturer if available for circuits different from the ones shown Carefully follow any special instructions affecting the general procedures outlined below 2 All wiring must comply with applicable electrical codes and ordinances 3 Disconnect the power supply before wiring to prevent electrical shock or equipment damage 4 If installing a separate Q345A flame sensor the sensor leadwire should be kept as short as possible and should not be allowed to rest against grounded metal surfaces 5 A common ground is required for the S8701 S8702 the spark igniter and the main burner The 24V GND terminal does not internally ground the transformer The 24 V GND terminal must be grounded to the equipment chassis separately Any auxiliary controls or limits must not be in the grounded leg 6 Ignition cable should not touch any metal surface or current carrying wires It must not be more than 6 ft 1 8m long 7 Do short valve terminals as this may damage the temperature controller the transformer or the
16. stem will stay locked out until it is reset by moving the temperature control setpoint to below room temperature no request for heat for 5 seconds Then re energize the system by moving the temperature control setpoint 5 F 3 C above room temperature Or remove 24 Vac power to the control then reapply NOTE F and models will automatically reset from lockout after one 1 hour 69 1174 S8701 S8702 DIRECT SPARK IGNITION CONTROLS 4 gt gt 3 SAFE START CHECK amp PREPURGE J AND K MODELS ONLY TRIAL FOR IGNITION q MAIN BURNER OPERATION THERMOSTAT CALLS FOR HEAT PREPURGE J amp K MODELS ONLY IF NO SPARK B D J AND K MODELS GO INTO LOCKOUT SPARK GENERATOR POWERED AFTER ONE 1 TRIAL FOR IGNITION PERIOD MAIN VALVE OPERATORS OPEN ALARM CIRCUIT IS ACTIVATED LED IS ON STEADY SYSTEM MUST BE RESET IF FLAME CURRENT SENSED IF FLAME CURRENT IS NOT SENSED MUST BE SENSED AT BOTH B D J AND K MODELS GO INTO LOCKOUT BURNERS ON 8702 AFTER ONE 1 TRIAL FOR IGNITION PERIOD SPARK GENERATOR IS SHUT OFF LED IN ON SYSTEM MUST BE RESET LOCKOUT TIMER IS RESET LOSS OF FLAME SPARK GENERATOR IS POWERED FLAME CURRENT B D J AND K MODELS GO INTO LOCKOUT AFTER ONE 1 TRIAL FOR IGNITION PERIOD LED IS ON STEADY SYSTEM MUST BE RESET TEMPERATURE CONTROLLER IS SATISFIED POWER TO UNIT IS INTERRUPTED VALVES CLOSE DURING NORMAL OPERATION
17. t in ignition checks safety lockout De energize the system by moving 5 S8701 and S8702 control cannot be repaired If the temperature control setpoint below room the troubleshooting procedure indicates a temperature or by removing the 24 Vac power to the malfunction in 8701 or S8702 it must be 8701 S8702 control Wait at least 5 seconds and replaced reenergize the system by moving the thermostat or 6 The following service procedures are for the temperature control setpoint 5 F 3 C above room 8701 S8702 and basic DSI systems On all temperature Return setpoint to normal temperature installations refer to the appliance peel or by re applying 24 Vac power to the S8701 control manufacturer s service instructions Sa 5 Check ceramic insulator on flame sensor spark igniter or igniter sensor A cracked insulator will allow current to leak to ground Replace device if insulator is cracked 7 69 1174 S8701 S8702 DIRECT SPARK IGNITION CONTROLS 6 Check the flame sensor and its mounting bracket Correct the position if bent out of shape 7 Review the S8701 S8702 normal sequence of operation See START SYSTEM section 8701 S8702 COMPONENT CHECKS Spark Ignition Circuit The step up transformer in the S8701 S8702 provides spark ignition at 14 000 volts open circuit To check the spark ignition circuit proceed as follows 1 Shut off gas supply to the gas control 2 Disconnect the ignition cable at the S8701 or
18. t typically cycle 400 times a day year round Perform a monthly checkout Water or Steam Cleaning If a control gets wet replace it If the appliance is likely to be cleaned with water or steam protect cover the control and wiring from water or steam flow Mount the control high enough above the floor so it does not get wet during normal cleaning procedures U S Registered Trademark Copyright 1999 Honeywell Inc All Rights Reserved High Humidity or Dripping Water Dripping water can cause the control to fail Never install an appliance where water can drip on the control In addition high ambient humidity can cause the control to corrode and fail If the appliance is in a humid atmosphere make sure air circulation around the control is adequate to prevent condensation Also regularly check out the system IMPORTANT Always install a splash cover to protect the control from water damage Corrosive Chemicals Corrosive chemicals can attack the control eventually causing a failure If chemicals are used for routine cleaning avoid contact with the control Where chemicals are suspended in air as in some industrial or agricultural applications protect the control with an enclosure Dust or Grease Accumulation Heavy accumulations of dust or grease can cause the control to malfunction Where dust or grease can be a problem provide covers for the control to limit contamina tion 69 1174 S8701 S8702 DIRECT SPAR
19. the burner spark igniter or igniter sensor mounting bracket the 24 Vac GND terminal and the GND burner terminal of the S8701 8702 If ground is poor or erratic safety shutdown may occur occasionally even though operation is normal at time of checkout Therefore if nuisance shutdowns have been reported be sure to check ground connections Electrical ground connections at the spark igniter or igniter sensor and the S8701 S8702 must be clean and tight If leadwire is damaged or deteriorated use only a 14 to 18 gauge moisture resistant thermoplastic insulated wire with the 105 C 221 F minimum rating as a replacement 69 1174 Flame Sensor Circuit The S8701 and S8702 provide ac power to the flame sensor which the burner flame rectifies to direct current If the flame signal is less than 1 0 uA dc the system will lockout Check the flame sensing current from the sensor to the 8701 S8702 control as follows 1 Connect a meter dc microammeter scale in series with the flame signal wire as shown in figures 4 and 5 Use the Honeywell W136A test meter or equiva lent Disconnect the flame sense wire from the sense terminal on the control Connect the red positive meter lead to the flame sense terminal on the control Connect the black negative meter lead to the flame sense wire that goes to the flame rod 2 Restart the system and read the meter The flame sensor current must be at least 1 0 HA and steady If the readi
20. the system starts as follows Spark turns on gas valve opens at once and burner ignites after gas reaches main burner Once burner flame is established spark igniter cuts off For S8702 models flame must be established on both burners for spark igniters to turn off S8701 S8702 DIRECT SPARK IGNITION CONTROLS NOTE If the gas control has been replaced or serviced lightoff may not be satisfactory until air has been purged from the gas line or the gas input and combustion air have been adjusted see manufacturer s instructions Table 6 Trial for Ignition Periods for the S8701 S8702 Trial for Ignition Should Not Exceed 5 05 sec 7 25 sec 12 75 sec 23 75 sec Specified Trial for Ignition TFI stamped on control 4 6 sec 6 6 sec 11 6 sec 21 6 sec Check Trial for Ignition Check device label on control to determine correct Trial for Ignition time 2 With the system power off and the thermostat or temperature control set to call for heat manually shut off the gas supply 3 Turn power on to energize the S8701 S8702 immediately start timing when the gas valve turns on 4 Determine the number of seconds to drop out of the gas valve It should not exceed the trial for ignition time shown in Table 6 5 After spark cutoff manually reopen gas supply cock No gas should flow to the main burner 6 Reset system as described below Resetting 58701 and 58702 After Safety Lockout If the control goes in
21. ting installation Be sure to conduct a gas leak test after the control is installed CAUTION Electric Shock Hazard Can cause personal injury or equipment damage Disconnect power supply before wiring 69 1174 IMPORTANT If this is a replacement application follow the appliance manufacturer s instructions if avail able The manufacturer usually provides wiring diagrams start up and checkout instructions and the service procedures for their system If the manufacturer s instructions are not available this information may be used as a general guide Mounting The 8701 S8702 Control Select a location within 6 ft 1 8m of the burner that will permit a direct cable route to the spark igniter terminal Ready access to the terminals is necessary for wiring and servicing The S8701 S8702 control may be mounted in any position Use No 6 32 machine screws or No 8 sheetmetal screws 1 inch long for fastening Fasten securely Do not exceed the ambient temperature rating given in Table 2 2 13 16 72 3 15 16 100 5 17 7 7 8 23 t Y 3 16 4 M16233 Fig 1 S8701 S8702 Dimensions Mounting Auxiliary Controls Mount the spark igniter flame sensor temperature control transformer gas control and any other auxiliary controls according to the manufacturer s instructions NOTE The 58701 S8702 installations require 24V transformer rated to handle both the S8701 S8702 cur
22. to safety lockout it will remain locked out for D and K models until the system is reset To reset the system Adjust the temperature control setting to below room temperature wait 5 seconds and move the temperature control setting up to request heat or remove 24V power and reapply Normal ignition should occur as described in Start System section NOTE F and M models have the 3 retry feature for Trial for Ignition with 30 second interpurge between TFI periods Safety lockout on the F and M models occurs after the 3rd TFI period if flame is not sensed F and M models also automatically reset after one 1 hour in lockout CHECKOUT Start the system and observe operation through at least one complete cycle to make certain all controls are operating safely Sequence of Operation The S8701 S8702 controls perform the following basic functions Supplies power to the electronic pulse generator circuit for the spark igniter 14 000 volts open circuit Allows up to 23 75 seconds maximum for ignition and 1 or 3 trials before system safety lockout occurs see Table 4 Senses burner flame for safe lighting 2 burners for 8702 Shuts off spark after burner is lit The S8701 and S8702 are powered by a 24 Vac trans former and activated when the temperature control requests heat Operation is as follows When the S8701 S8702 control is activated by the temperature control s request for heat S8701 S8702 controls
23. uide 69 1174 10 11 69 1174 Honeywell Home and Building Control Honeywell Inc Honeywell Plaza P O Box 524 Minneapolis MN 55408 0524 69 1174 L C 4 99 Printed in Mexico Home and Building Control Honeywell Limited Honeywell Limit e 155 Gordon Baker Road North York Ontario M2H 3N7 www honeywell com
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