Fulton Vertical Tubeless (FT-A) Thermal Fluid (hot oil) Heater - Manual (Page 74)

© The Fulton Companies 2013
MAINTENANCE
FTA-IOM-2013-0227
SECTION 4
4-14
Switch setting is im-
proper
The adjustment screw for the air switch is located opposite the electrical connections. A gray cap covers the screw.
Turn the screw clockwise to increase setting, counter-clockwise to decrease setting. The switch setting should be set
in such a way that with 50 % of the air box opening blocked, the switch will trip. Reset switch setting, reset the fl ame
programmer, and try to light the unit again.
TABLE 10-H - AUXILIARY BLOWER MOTOR STARTER TROUBLESHOOTING
Problem Potential Remedy
The blower motor
starter coil is bad
If this is the case, the blower starter will not latch in. Check for voltage to the coil. If proper voltage is present and the
starter does not pull in, that proves the coil is bad. Replace the starter, reset the fl ame programmer and try to light
unit again.
The auxiliary contacts
are burned or pitted
Visibly inspect contacts. With power off , attempt to clean or replace starter if damaged. Reset fl ame programmer and
try to light unit again.
TABLE 10-I - HIGH TEMPERATURE LIMIT TROUBLESHOOTING
Problem Potential Remedy
Flow rate is too low Too low of a fl ow rate will result in a higher rate of heat transfer to the thermal fl uid. This will result in a higher tem-
perature diff erence between inlet temperature and outlet temperature.
It is important to make sure that the minimum fl ow rate as specifi ed by Fulton for that specifi c model is maintained
Check inlet and outlet pressures of the heater to determine diff erential pressure and fl ow rate. Ensure that this fl ow
rate meets or exceeds minimums specifi ed by Fulton (see chart). Also check diff erential pressure switch for proper
operation and setting.
Heater is over-fi red If the heater has more fuel input than design, it is probable that the heat transfer rate will increase beyond design.
Check input to heater at high fi re for modulated heaters or at the standard rate for on / off units. This can be done by
either using a corrected gas meter reading or measuring gas pressure supplied to the burner compared to factory
test-fi re settings.
If input is improper, inspect burner as described below. If burner is not damaged or have improper components,
adjust fuel input and combustion to specifi cation.
Gas-fi red burner is
damaged
Pull and inspect the burner. Primary areas of concern for gas-fi red units are the orifi ce plate, pilot assembly seating
and orifi ce plate gap.
If the orifi ce plate is warped or burned through, pilot assembly is not seated or gap between orifi ce plate and gas
tube is improper, more fuel than designed for will enter the furnace.
This will cause the heater to have more fuel input than designed for. The design fl ow rate will then be too low
causing the fl uid to heat up higher than it should.