ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
HOT SURFACE IGNITER / FLAME SENSOR / CONTROL TIMING
HOT SURFACE IGNITER
This water i s equipped with an electric hot surface i gniter. The i gniter m aterial i s silicone carbide and should not be handled with bare hands because of possible damage to the igniter.
The normal ohm reading at 77°F is listed between 40 and 70 ohms. The minimum igniter current monitored by the CCB is 2.7 amps. Once this threshold is met a check mark will appear by the igniter i con i n the UIM (display).
CONTROL TIMING
25 seconds | ||
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Igniter | 17 seconds | |
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Trial for ignition | 5 seconds | |
Gas Control Open | ||
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Inter/Post Purge | 30 seconds | |
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FLAME SENSOR
This water hea ter is eq uipped w ith an electronic flame sensor. The flame sensor senses fl ame by passi ng a s mall electric current through the burner flame. This type of f lame s ensing is al so k nown a s fl ame rectification. T he CCB is l ooking fo r a minimum current of .7 micro amperes for the water heater to operate. Once this current is established the UIM will display a flame icon.
State Water Heaters – Technical Training Department 31 | Ashland City, Tennessee © 2009 |
Servicing should only be performed by a Qualified Service Agent |
