User guide

© The Fulton Companies 2013
4-8
MAINTENANCE FTCS-IOM-2013-1114 SECTION 4
! WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct,
and strict adherence to applicable
jurisdictional/professional codes and
regulations.
4 CAUTION
All maintenance procedures should
be completed by trained personnel.
Appropriate training and instructions
are available from the Fulton Service
Department at [phone] or your
local Fulton Thermal Representative.
 Air Switch
Remove the ¼” copper tubing from the bottom of the air switch with the fan
running. Air switch should trip the interlock circuit. Re-attach copper tubing and
reset  ame programmer.
 Air Filter Box Switch
With heater running at high  re, block opening to air  lter box by 50%. Slowly close
o further until switch trips. Air  lter switch should trip at just over 50% blockage.
Monitor combustion valves during this procedure.
 Temperature Limit(s)
Adjust set point(s) of temperature limit(s) down to a point lower than the process
variable (PV). PV is typically the current  uid temperature at the heater outlet.
Solid-state controls will deactivate a control relay powering a set of n.c. contacts
in the interlock circuit. Analog controls will open their contacts in the interlock
circuit. Trip temperature should be within 5 degrees of PV temperature. Reset
temperature limit if reset exists and reset  ame programmer.
 High/Low Gas Pressure Switch
 TESTING OF LOW GAS PRESSURE SWITCH
While boiler is running, increase the  ring rate to the highest modulation rate
(usually 100 percent high  re); increase the dial on the low gas pressure switch
keeping note of the pressure at which the switch trips and the boiler locks out.
Once the low gas pressure switch trips, decrease the low gas pressure switch
50 percent lower than the trip position (e.g., boiler trips at 10, decrease dial to
5). Once dial is set to desired range, reset the pressure switch and the  ame
programmer and turn boiler on. Observe for proper operation.
 TESTING OF HIGH GAS PRESSURE SWITCH
While boiler is running, decrease the  ring rate to the lowest modulation rate
(usually 0 percent low  re); decrease the dial on the high gas pressure switch
keeping note of the pressure at which the switch trips and the boiler locks out.
Once the high gas pressure switch trips, increase the high gas pressure switch
50 percent higher than the trip position (e.g., boiler trips at 10, increase dial to
15). Once dial is set to desired range, reset the pressure switch and the  ame
programmer and turn boiler on. Observe for proper operation.
NOTE:  High gas pressure switch may sense pressure before or after gas
butter y valve. This will impact testing of high gas pressure switch. In a
case where gas is sensed before butter y valve, use instructions above. If
sensing line is after the butter y valve, test the high gas pressure switch
during high  re position (usually 100 percent high  re). This is where the
most gas pressure will be present. In some cases, you may have to close the
ball valve after the gas butter y valve and the high gas pressure switch to
make it trip.