valutazioni - 4, GPA: 4.5
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Facilità d'uso
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 m A, or • The ignition activation period ends If the main burner lights, a flame sensing circuit is completed 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 system 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 M models will automatically reset from lockout after one (1) hour. 5 69-1174 S8701/S8702 DIRECT SPARK IGNITION CONTROLS S8701/S8702 DIRECT SPARK IGNITION CONTROLS THERMOSTAT CALLS FOR HEAT SAFE START CHECK PREPURGE (J AND K MODELS ONLY) IF NO SPARK, B, D, J, AND K MODELS GO INTO LOCKOUT AFTER ONE (1) TRIAL FOR IGNITION PERIOD. ALARM CIRCUIT IS ACTIVATED. LED IS ON STEADY. SYSTEM MUST BE RESET. TRIAL FOR IGNITION 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 S8702) AFTER ONE (1)TRIAL FOR IGNITION PERIOD. SPARK GENERATOR IS SHUT OFF. LED IN ON. SYSTEM MUST BE RESET. LOCKOUT TIMER IS RESET. MAIN BURNER OPERATION UNIT MONITORS BURNER FLAME CURRENT. LOSS OF FLAME MAIN BURNER SPARK GENERATOR IS POWERED. OPERATION 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 LED BLINKS ONCE PER SECOND. MAIN BURNER(S) ARE OFF. END 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). SAFE START CHECK. LED BLINKS RAPIDLY. PREPURGE - J & K MODELS ONLY SPARK GENERATOR POWERED MAIN VALVE OPERATORS OPEN. 6 S8701/S8702 DIRECT SPARK IGNITION CONTROLS S8701/S8702 DIRECT SPARK IGNITION CONTROLS THERMOSTAT CALLS FOR HEAT SAFE START CHECK SAFE START CHECK. LED BLINKS RAPIDLY. PREPURGE (L AND M MODELS ONLY) TRIAL FOR IGNITION SPARK GENERATOR POWERED MAIN VALVE OPERATORS OPEN. PREPURGE - L & M MODELS ONLY INTERPURGE IF NO SPARK, E, F, L, AND M MODELS GO INTO LOCKOUT AFTER THREE (3) TRIAL FOR IGNITION PERIODS. ALARM CIRCUIT IS ACTIVATED. LED IS ON STEADY. SYSTEM WILL AUTOMATICALLY RETRY AFTER ONE (1) HOUR. IF FLAME CURRENT SENSED: IF FLAME CURRENT IS NOT SENSED: SPARK GENERATOR AND MAIN VALVE OFF. GO TO BURNERS ON S8702) (MUST BE SENSED AT BOTH 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. MAIN BURNER OPERATION END MAIN BURNER OPERATION UNIT MONITORS BURNER FLAME CURRENT. TEMPERATURE CONTROLLER IS SATISFIED. POWER TO UNIT IS INTERRUPTED. VALVES CLOSE. MAIN BURNER(S) ARE OFF. LOSS OF FLAME SPARK GENERATOR IS POWERED. E, 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. DURING NORMAL OPERATION LED BLINKS ONCE PER SECOND. 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 IMPORTANT 1. Only persons trained and experienced in DSI systems should service this equipment. 2. If a condition exists that causes the S8701 or S8702 control ...
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