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ULTRAFORCE COMMERCIAL GAS WATER HEATER
SUF 120 thru 400 SERVICE HANDBOOK
State Water Heaters – Technical Training Department 31 Ashland City, Tennessee © 2009
Servicing should only be performed by a Qualified Service Agent 198152-002
HOT SURFACE IGNITER / FLAME SENSOR / CONTROL TIMING
HOT SURFACE IGNITER
This water is 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 icon in the
UIM (display).
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 flame 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.
CONTROL TIMING
Pre-purge 25 seconds
Igniter Warm-up 17 seconds
Trial for ignition
Gas Control Open
5 seconds
Inter/Post Purge 30 seconds