Hot Surface Igniter / Flame Sensor / Control Timing - State Water Heaters SUF 130 300 Service Handbook

ULTRAFORCE COMMERCIAL GAS WATER HEATER

HOT SURFACE IGNITER / FLAME SENSOR / CONTROL TIMING

HOT SURFACE IGNITER
This water i s eq uipped with a n electric hot
surface i gniter.
silicone carbide and should not be handled
with bare hands because of possible damage
to the igniter.
The norm al ohm read ing at 77°F is listed
between 40 and 70 ohm s. T he m inimum
igniter current monitored by the CCB is 2.7
amps. Once this threshold is met a check
mark will a ppear by th e i gniter i con i n the
UIM (display).
FLAME SENSOR
This water hea ter is eq uipped w ith an
electronic flame sensor. T he 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
SUF 120 thru 400 SERVICE HANDBOOK
The i gniter m aterial i s
Servicing should only be performed by a Qualified Service Agent
CONTROL TIMING
Pre-purge
Igniter Warm-up
Trial for ignition
Gas Control Open
Inter/Post Purge
Ashland City, Tennessee © 2009
25 seconds
17 seconds
5 seconds
30 seconds
198152-002