Fulton Alliance (FT-HC) Horizontal Coil Thermal Fluid (hot oil) Heater - Manual (Page 75)

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SECTION 4
FTHC-IOM-2012-1001
MAINTENANCE
4-11
 LOW OIL PRESSURE SWITCH
All oil fi red modulating thermal fl uid heaters have a Low Oil
Pressure Switch. This is a normally closed diaphragm switch
that opens on a pressure decrease below set point. The Low
Oil Pressure Switch is a safety device that protects the burner
from receiving too low of an oil pressure. The switch senses
this pressure just downstream of the gas pump. If this switch
trips, it is generally one of the issues indicated in Table 10-M.
 PILOT FLAME FAILURE
A Pilot Flame Failure is a fl ame failure that occurs when the
unit is trying to establish an adequate fl ame signal. Solid-state
controllers indicate a Pilot Flame Failure by showing as a fault
code either Fault 28 for Honeywell 7800 series controllers.
Flame Failure PTFI on Fireye E110 series controllers or Fault
9 on Fireye Nexus controls. For electro-mechanical controls,
you need to witness when the failure occurs. A Pilot Flame
Failure indicates that either a strong enough pilot fl ame
was not generated or the means of sensing the pilot fl ame
strength has failed. All gas fi red units have a gas pilot. Oil fi red
units may be 2-stage, in which the 1st stage to light would be
considered the pilot, or may have a gas pilot. In either case,
during the pilot proving period, the fl ame programmer must
sense a strong enough fl ame to initiate the opening of the
main valves. See Table 10-N.
 MAIN FLAME FAILURE
Main Flame Failure is a fl ame failure that occurs while the
unit is trying to establish an adequate fl ame signal during the
Main Flame Trial for Ignition.
Solid state controllers indicate a Main Flame Failure by
showing as a fault code of either Fault 19 for Honeywell 7800
series controllers, Flame Failure MTFI on Fireye E110 series
controllers, or a Fault 09 for Fireye Nexus controls. For electro-
mechanical controls, you need to witness when the failure
occurs.
A Main Flame Failure indicates that either a strong enough
main fl ame was not generated or the means of sensing
the main fl ame strength has failed. During the main fl ame
proving period, the fl ame programmer must sense a strong
enough fl ame to hold the main valves open. If you are
experiencing Main Flame Failures, check the items indicated
in Table 10-O.