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SiNi* HSI * Silicon Nitride Ignitor

SiNi* HSI * Silicon Nitride Ignitor. Silicon Nitride Ignitors (SiNi) Makeup & Properties. Consists of a tungsten heater element and silicon nitride ceramic insulators Has excellent high temperature durability making it a good choice for hot surface ignition

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SiNi* HSI * Silicon Nitride Ignitor

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  1. SiNi* HSI*Silicon Nitride Ignitor

  2. Silicon Nitride Ignitors (SiNi)Makeup & Properties • Consists of a tungsten heater element and silicon nitride ceramic insulators • Has excellent high temperature durability making it a good choice for hot surface ignition • Cannot be used in direct flame sensing applications • The element is completely insulated and cannot conduct electrical current to sense flame current • The SiNi can only be checked by ohming in a cold condition

  3. A good ignitor reads 11 – 18 ohms • A bad ignitor will have a much higher resistance • A silicon carbide ignitor cannot be replaced with an SiNi without changing the ignition control module • A silicon carbide ignitor operates on 120VAC • SiNi operates on 80 volts R.M.S.* • 80 volts is less than that provided to the furnace *R.M.S. (Root Means Square) is the value assigned to an alternating current or voltage that results inthe same power dissipation in a fixed resistance as DC current or voltage of the same numerical value

  4. How It Works • The ignition module it will reduce the number of cycles it supplies to the SiNi per second • The control checks line voltage constantly when a call for heat is received • The control sets the number of cycles it supplies to the ignitor based on the line voltage it is reading A) This reduced number of AC sine wave cycles per second reduces the effective voltage (R.M.S.) applied to the SiNi igniterper second

  5. b) If the line voltage is low, the number of cycles will go up c) If the line voltage is high, the number of cycles is reduced d) After each successful ignition the number of cycles is reduced 4. During this learning program the number of cycles will become too low and the gas will fail to ignite 5. A retry initiated by the IFC and the number of sine wave cycles is raised slightly to increase the igniter temperature

  6. 6. The ignition control module, on successful ignition during a retry, will use that cycle count and will be maintained for the next 255 calls for heat or until another retry is called for 7. The IFC repeats the learning process again after 255 calls for heat have been completed or whenever power to the furnace is cycled off and then on again 8. The learning process is employed to provide the most reliable ignition system possible

  7. 9. Lowering the ignitor temperature provides the longest possible service life for the SiNi 10. Most controls requires the correct polarity of the 120 VAC wiring and a ground connectionfor proper operation 11. If the line voltage is low, line polarity reversed or if the ground is not properly connected the control will lock out

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