resideo S89E - User Manual

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PRODUCT DATA

68-0066-05

S89E,F

Direct Spark Ignition Control Module

APPLICATION

The S89E,F Direct Spark Ignition Control Modules control the

ignition sequence and gas control operation in direct spark

systems used primarily on gas-fired atmospheric and power

burners in residential furnaces and heating appliances.

FEATURES

• Requires separate 120 Vac spark generator.

• S89E has 10-second maximum delay for safe start check

before ignition.

• S89F has 38-second maximum delay for safe start check

plus valve on delay before ignition.

• Available 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 ignite.

• Flame rectification principle used to monitor flame; false

flame signals resulting from short to ground results in

safety shutdown.

• After safety shutdown, S89E and F can be reset from the

thermostat.

Contents

Application .......................................................................... 1

Features .............................................................................. 1

Specifications ..................................................................... 2

Installation .......................................................................... 3

Wiring .................................................................................. 4

Start-Up and Checkout ...................................................... 4

Operation ............................................................................ 7

Troubleshooting ................................................................. 8

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The Resideo S89E,F Direct Spark Ignition Control Module is an electronic control unit designed for direct spark ignition systems. It primarily controls the ignition sequence and gas control operation in gas-fired atmospheric and power burners found in residential furnaces and heating appliances.

Function Description:

The S89 module operates in response to a call for heat from a thermostat. Upon receiving a call, it performs a safe start check to ensure no flame or flame-simulating condition is present. If a flame is detected during this check, the system locks out and must be reset. Following a successful safe start check, and a valve-on delay period for the S89F model, the module energizes the spark generator and igniter. Simultaneously, the gas control opens, allowing gas to flow to the burner. The igniter remains active during the initial 80% of the ignition or lockout timing period. During the remaining 20% of this period, the igniter turns off, and the flame sensor attempts to prove the flame. Flame is considered proven when the current from the flame sensor through the burner flame to ground reaches 0.8 µA dc. If the flame is proved, the gas control remains open until the call for heat ends. If the flame is not proved, the gas control closes, and the system locks out until reset. If flame is lost after being proved, the S89 closes the gas control, performs a safe start check, and, for the S89F, a valve-on delay, then returns to the ignition sequence. The S89 can be reset by turning the thermostat below room temperature or removing power to the system for 45 seconds.

Important Technical Specifications:

Power Supply: Requires two power supply connections (24 Vac and 120 Vac, 50/60 Hz).
Current at 24V 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.
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.
Safety Lockout Timing: Available with 4 or 11 seconds nominal. Ignition is active during approximately the first 80% of lockout timing and off during the last 20% for flame proving.
- 4 seconds lockout: 3.0 seconds minimum, 5.5 seconds maximum.
- 11 seconds lockout: 8.0 seconds minimum, 15.0 seconds maximum.
Flame Failure Response Time: 2 seconds maximum with 2.5 µA flame current.
Flame Current Signal: 0.8 µA minimum.
Ambient Temperature Range: -40°F to +175°F (-40°C to +80°C).
Wiring Connections:
- 24 Vac: 3/16 in. quick-connects.
- 120 Vac: 12 in. (305 mm) color-coded leadwires.
Sensing Lead: Up to 36 in. (0.9m). Insulation must be rated for 100 megohm resistance between wire and ground.
Mounting: Can be mounted in any position.
Approvals: Underwriters Laboratories Inc. Component Recognized (File No. MP268, Guide No. MCCZ2), CSA International Certified (158158-1047805).

Usage Features:

Complete Shutoff: Provides 100% shutoff, suitable for use with all heating gases.
Separate Electrodes: Utilizes separate electrodes for spark ignition and flame sensing, enhancing reliability.
Gas Control Compatibility: Designed for use with Resideo or other 2A or less dual valve combination gas controls specifically for Direct Spark Ignition (DSI) applications.
Lockout System: Locks out the system after the trial for ignition if the main burner fails to ignite, ensuring safety.
Flame Rectification: Employs the flame rectification principle to monitor flame, with false flame signals (e.g., from short to ground) resulting in a safety shutdown.
Thermostat Reset: Allows the S89E and F modules to be reset from the thermostat after a safety shutdown.
External Spark Generator: Requires a separate 120 Vac spark generator.

Maintenance Features:

Troubleshooting Guide: The manual provides a detailed troubleshooting guide, including a flowchart, to identify and resolve common issues.
Spark Ignition Circuit Check: Instructions are provided for checking the spark ignition circuit, including testing the spark generator output voltage.
Flame Sensor and Igniter Check: Guidelines for inspecting the flame sensor and igniter, including proper positioning, ceramic insulator integrity, and electrical connections.
Burner Flame Condition Check: Visual aids and descriptions are provided to help identify and correct issues with burner flame conditions (e.g., noisy lifting, waving, small blue, lazy yellow, good rectifying flame).
Flame Current Measurement: Detailed steps for measuring flame current using a microammeter to ensure it meets the minimum requirement of 0.8 µA dc.
Grounding Check: Emphasizes the importance of good metal-to-metal contact and proper wiring for the common ground between the module, igniter, flame sensor, and main burner to prevent nuisance shutdowns.
Non-Repairable Module: The ignition module itself cannot be repaired and must be replaced if it malfunctions.
Replacement Requirements: When replacing an S89, it is crucial to use a unit with the same or shorter lockout time and the same or longer delay timing as the original control. External valve on delay timers should be disconnected when using S89E or S89F controllers.