Hot Surface Ignitors (HSI) are used on Voyager II/III staged gas heat and modulating gas heat. They perform 2 functions:
-Ignition source to light the burner
-Flame proving
Reasons for failure:
- Moisture or oils from hands during handling can cause failure when the HSI is energized
- HSI are constructed from recrystallized silicon carbide and are sensitive to moisture and oils. Avoid touching the element end when handling.
- Input voltage issues
- Input voltage is provided by TNS2 secondary terminals X1 & X2. Voltage should be between 105vac to 132vac. Verify that TNS2 primary voltage taps (H2 or H3) match the input voltage for the unit. X2 on the secondary should be grounded.
- For other voltages, see unit wiring diagram
- Input voltage is provided by TNS2 secondary terminals X1 & X2. Voltage should be between 105vac to 132vac. Verify that TNS2 primary voltage taps (H2 or H3) match the input voltage for the unit. X2 on the secondary should be grounded.
- Vibration/shock
- Avoid rough handling of the HSI, especially when removing for service.
- Check new parts when purchasing
HSI checkout
- Check cold resistance
- HSI manufactured by Coorstek (KIT03033 pre Sept 2021) resistance range = 40-80Ω @ 75°F
- HSI manufactured by SCP (KIT03033USA Sept 2021-current) resistance range = 65-120Ω @ 75°F
- Check amperage of HSI when energized
- HSI manufactured by Coorstek (KIT03033 pre Sept 2021) range = 3.5 - 3.9A @ 132vac
- HSI manufactured by SCP (KIT03033USA Sept 2021-current) range = 3.3 - 3.7A @ 116vac
- Visual inpsection
- Check HSI for cracks or damage in the element
- Lines of what appears to be dust or soot indicate a crack that has not completely separated
- Flame check
- The IGN board of V2/V3 unit has "Flame Check" terminals for checking voltage with a DC volt meter
- 1 vdc = 1µA DC, Typical "good" flame signal is 2µA DC to 8µA DC
For more information about the IGN module or burner see:
Click HERE to access the Trane Power Burner Manual
In September 2021, the factory changed manufacturers for HSI due to supplier shortages. With this change, the cold resistance range changed. See below for manufacturer differences and part numbers.
KIT03033 (x13130447010) Up to Sept 2021
Manuf: Coorstek
40-80Ω @ 75°F +/-5°F
3.5 - 3.9 amps @ 132vac
Distance from tip of element to back of housing is ~3.34"
KIT03033USA (x13710056001) Sept 2021 to current
Manuf: SCP
65-120Ω @ 75°F +/-5°F
3.3 - 3.7 amps @ 116vac
Distance from tip of element to back of housing is ~3.65"
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.