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resideo S89E, Manual

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resideo S89E Manual Download Page 7

S89E,F DIRECT SPARK IGNITION CONTROL MODULE

7

68-0066—05

OPERATION

The S89 is powered by a 24V transformer. It operates in 
response to a call for heat from the thermostat.

On every call for heat, the S89 performs a safe start check. If a 
flame or a flame simulating condition is present, the S89 locks 
out without starting the igniter and must be reset.

Following the safe start check and, on the S89F, a valve on 
delay period, the S89 spark generator contacts close to 
energize the spark generator and the igniter. At the same time 
the gas control, powered through the gas valve relay contacts 
in the S89, opens so gas can flow to the burner. The igniter is 
on during approximately the first 80 percent of the ignition, or 
lockout timing, period. During the balance of the lockout 

timing period, the ignition is off and the flame sensor attempts 
to prove the flame. The flame is proved when current from the 
flame sensor through the burner flame to ground reaches 
0.8 

μ

A dc. 

If flame is proved,

 the gas control remains open and the 

burner on until the call for heat ends.

If flame is not proved, 

the gas control closes and the system is 

locked out until the S89 is reset.

If flame is lost after being proved, 

the S89 will close the gas 

control, perform a safe start check, and, on the S89F, valve on 
delay, then return ignition as described above.

The S89 is reset by turning the thermostat below room 
temperature or removing power to the system for 45 seconds.

Fig. 4. Normal sequence of operation.

START

SAFE

START

CHECK

VALVE-ON DELAY

(S89F ONLY)

POWER INTERRUPTION.
SYSTEM SHUTS OFF. RESTARTS
WHEN POWER IS RESTORED.

IF FLAME SIMULATION
CONDITION IS PRESENT,
SYSTEM WILL NOT START.

IF NO SPARK, S89 LOCKS OUT
AND SHUTS DOWN SYSTEM.
MUST BE RESET.

IF FLAME CURRENT IS ABSENT,
WEAK, OR UNSTEADY, S89
LOCKS OUT AND SHUTS DOWN
SYSTEM. MUST BE RESET.

IF FLAME IS LOST, S89 CLOSES
GAS CONTROL, THEN RESTARTS
SAFE START CHECK AND TRIAL
FOR IGNITION.

THERMOSTAT
CALLS FOR HEAT.

SAFE START
CHECK

SPARK GENERATOR
POWERED. IGNITION
BEGINS AND GAS
CONTROL OPENS.

BURNER LIGHTS.
IGNITION STOPS
AND FLAME
CURRENT IS
SENSED.

BURNER RUNS
S89 MONITORS
FLAME CURRENT.

THERMOSTAT
SATISFIED. GAS
CONTROL CLOSES,
BURNER GOES OFF.

TRIAL FOR

IGNITION

BURNER

OPERATION

END

M19838A

1

2

3

4

5

6

VALVE-ON DELAY
(S89F ONLY)
COMBUSTION
AIR BLOWER
STARTS.

2A

Summary of Contents for S89E

Page 1: ...e with 4 or 11 second nominal lockout timing 100 percent shutoff for use with all heating gases Ambient temperature rating is 40 F to 175 F 40 C to 80 C Separate electrodes for spark ignition and flame sensing Uses Resideo or any other 2A or less dual valve combination gas control designed for Direct Spark Ignition DSI applications Locks out system after trial for ignition if main burner fails to ...

Page 2: ...input 2 2A maximum Valve Contacts 2 0A maximum run 20A maximum inrush at 24 Vac Spark Generator Relay Contacts 1 5A at 120 Vac 50 60 Hz Transformer Rating See Table 1 Thermostat Heat Anticipator Setting 0 2A plus gas control current Delay Timing S89E Safe Start Check 10 seconds maximum S89F Safe Start Check plus Valve On Delay 38 seconds maximum Table 1 Transformer Rating Safety Lockout Timing 4 o...

Page 3: ... LP gas is heavier than air and will not vent upward naturally Do not operate electric switches lights or appliances until you are sure that work area is free of gas 4 Never install an S89 where water can flood drip or condense on the device It can malfunction if it gets wet 5 Never try to use a device that has been damp or wet replace it 6 If the control might be exposed to water or moisture inst...

Page 4: ...isconnect the external timer when using an S89E or F To disconnect the timer a Turn off power b Cut the two leadwires at the external timer c Strip the ends of the wires 1 2 in 13 mm and connect with a solderless connector d Restore power 3 Wire system components and S89 as shown in Figures 2 and 3 Refer to appliance manufacturer instructions for connections to other auxiliary controls 4 Make sure...

Page 5: ...gas supply 6 Gas control closes 7 The module begins the safe start check S89E 10 seconds maximum or safe start check plus valve on delay 30 seconds minimum after which the igniter starts and gas control opens 8 Time system until gas control closes S89 is now in safety lockout The lockout time should be within the specifications in Table 2 9 Open gas supply System remains off and no gas flows to th...

Page 6: ...lly If adjusting the thermostat does not reset the S89 turn off power to the appliance for 45 seconds and then turn it on Final Checkout With power and gas supply on set thermostat to call for heat and observe operation through at least one complete cycle to make certain that all controls are operating safely BLUE WHITE GROUND BURNER IGNITER M19837 FLAME SENSOR 120 V SPARK GENERATOR BLACK AIR PROV...

Page 7: ...all for heat ends If flame is not proved the gas control closes and the system is locked out until the S89 is reset If flame is lost after being proved the S89 will close the gas control perform a safe start check and on the S89F valve on delay then return ignition as described above The S89 is reset by turning the thermostat below room temperature or removing power to the system for 45 seconds Fi...

Page 8: ... to protect the ground wire from radiant heat Check Spark Ignition Circuit The S89 spark generator relay switches 120 Vac to the remote mounted spark generator which in turn powers the spark igniter at the burner Check as follows 1 Shut off gas supply to the gas control 2 Disconnect the ignition cable at the spark generator stud terminal 3 Set the thermostat to call for heat 4 Reset the S89 by rem...

Page 9: ... SHIELD CABLE IF NECESSARY MAKE SUE BURNER SPARK IGNITER AND S89 GROUND BURNER TERMINAL HAVE EFFECTIVE COMMON GROUND POOR OR ERRATC GROUND WILL CAUSE NUISANCE SHUTDOWNS CHECK FOR CRACKED INSULATOR ON IGNITER OR FLAME SENSOR REPLACE DEVICE WITH CRACKED INSULATOR TO PREVENT SHORT TO GROUND NOTE IF S89 LOCKS OUT RESET BEFORE CONTINUING CHECK FOR 24 VAC ACROSS VALVE AND VALVE GROUND TERMINALS ON S89 I...

Page 10: ...nt must be at least 0 8 μA and steady 3 If the meter reads less than 0 8 μA or reading is unsteady recheck points under Check Flame Sensor and Igniter above Fig 6 S89 flame current measurement Fig 7 Check burner flame condition GND BURNER 24V GND 24V VALVE VALVE GND SENSE TO SENSOR BLACK RED M19840 FLAME SENSOR CURRENT CHECK USE µA SCALE 0 8 µA DC MINIMUM AND STEADY DISCONNECT WIRE FROM SENSE TERM...

Page 11: ... 24 V THERMOSTAT SAFE START CHECK CIRCUIT ALTERNATE LIMIT ON OFF SWITCH 24 V GND GND BURNER SENSE WHITE FLAME SENSOR SPARK IGNITER RELAY BLUE BLUE BLACK WIRING EXTERNAL TO S89 WIRING INSIDE S89 2K1 1K2 2K2 SPARK IGNITER SPARK GENERATOR VALVE SPARK IGNITER RELAY 1K 2K VALVE GND SENSOR CIRCUIT TIMING CIRCUIT DUAL VALVE L1 HOT L2 ...

Page 12: ... in United States Fig 9 S89F simplified control system schematic M19843A LIMIT CONTROL AIR PROVING SWITCH COMBUSTION AIR BLOWER 24 V THERMOSTAT SAFE START CHECK VALVE ON DELAY CIRCUIT COMBUSTION AIR BLOWER RELAY ALTERNATE LIMIT ON OFF SWITCH 24 V GND GND BURNER SENSE WHITE FLAME SENSOR SPARK IGNITER RELAY BLUE BLUE BLACK WIRING EXTERNAL TO S89 WIRING INSIDE S89 2K1 1K2 2K2 SPARK IGNITER SPARK GENE...

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