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Lists key characteristics and capabilities of the control modules.
Covers models, electrical ratings, transformer requirements, and temperature range.
Details delay timing, lockout timing, flame response, and current signals.
Specifies connection types, sensing lead, and mounting orientation.
Lists essential steps and checks before commencing installation.
Critical safety warnings for installation to prevent hazards.
Crucial safety warnings for wiring, preventing shock and damage.
Instructions for initial system verification after installation.
Procedure for testing gas leaks to ensure system safety.
Notes on potential lightoff issues after gas control replacement.
Safety warning related to troubleshooting procedures for hazards.
Procedure for checking grounding issues causing nuisance shutdowns.
Procedure for testing the spark ignition circuit functionality.
Procedure for inspecting the flame sensor and igniter for proper function.
Visual guide to common flame conditions and their causes.
Lists key characteristics and capabilities of the control modules.
Covers models, electrical ratings, transformer requirements, and temperature range.
Details delay timing, lockout timing, flame response, and current signals.
Specifies connection types, sensing lead, and mounting orientation.
Lists essential steps and checks before commencing installation.
Critical safety warnings for installation to prevent hazards.
Crucial safety warnings for wiring, preventing shock and damage.
Instructions for initial system verification after installation.
Procedure for testing gas leaks to ensure system safety.
Notes on potential lightoff issues after gas control replacement.
Safety warning related to troubleshooting procedures for hazards.
Procedure for checking grounding issues causing nuisance shutdowns.
Procedure for testing the spark ignition circuit functionality.
Procedure for inspecting the flame sensor and igniter for proper function.
Visual guide to common flame conditions and their causes.
The Honeywell S89E,F Direct Spark Ignition Control Modules are electronic controls designed for direct spark ignition systems, primarily used in gas-fired atmospheric and power burners found in residential furnaces and heating appliances. These modules manage the entire ignition sequence and gas control operation, ensuring safe and efficient heating.
The S89E,F modules operate by controlling the flow of gas and the generation of a spark to ignite the main burner. When a call for heat is initiated by the thermostat, the module first performs a "safe start check." This crucial step verifies that no flame or flame-simulating condition is present before attempting ignition. If such a condition is detected, the S89E,F will lock out, preventing the system from starting until it is manually reset. This safety feature is paramount in preventing hazardous situations like uncontrolled gas release or explosions.
Following a successful safe start check, and on the S89F model, after an additional valve-on delay period, the module energizes the spark generator. This causes the igniter to produce a spark at the burner. Simultaneously, the gas control, powered through the module's gas valve relay contacts, opens to allow gas to flow to the main burner. The igniter continues to spark for a significant portion of the lockout timing period, typically the first 80 percent. During the remaining 20 percent of the lockout timing, the ignition ceases, and the flame sensor actively monitors for the presence of a flame.
The module utilizes the flame rectification principle to monitor the flame. This means it converts the alternating current (AC) supplied to the flame sensor into a direct current (DC) signal through the flame itself. If the flame is successfully proved—meaning the flame current from the sensor through the burner flame to ground reaches a minimum threshold of 0.8 µA dc—the gas control remains open, and the burner continues to operate until the call for heat ends.
If the flame is not proved within the lockout timing, the gas control closes, and the system enters a safety lockout state, requiring a manual reset. Similarly, if the flame is lost after being successfully proved, the S89E,F will close the gas control, perform another safe start check, and, on the S89F, the valve-on delay, before attempting to re-ignite the burner.
The S89E,F modules are designed for 100 percent shutoff, meaning they completely stop the flow of gas if ignition fails or a flame is lost, enhancing safety across all heating gases. They require a separate 120 Vac spark generator and are compatible with Honeywell or other dual-valve combination gas controls rated 2A or less, specifically designed for Direct Spark Ignition (DSI) applications.
The S89E,F modules offer several features that enhance their usability and safety:
While the S89E,F modules themselves are not repairable and must be replaced if malfunctioning, their design facilitates troubleshooting and ensures proper system operation:
These features collectively contribute to the S89E,F modules' role in providing reliable, safe, and efficient direct spark ignition control for heating appliances.
General| Ignition Type | Intermittent Pilot |
|---|---|
| Enclosure Rating | NEMA 1 |
| Frequency | 60 Hz |
| Output Type | Relay |
| Operating Temperature | -40°F to 150°F (-40°C to 65°C) |
| Dimensions | 4.5 x 3.5 x 2.5 inches (114 x 89 x 64 mm) |
