Fulton Vertical Tubeless (FT-A) Thermal Fluid (hot oil) Heater - Manual (Page 66)

© The Fulton Companies 2013
MAINTENANCE
FTA-IOM-2013-0227
SECTION 4
4-6
!
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 (315) 298-5121 or your
local Fulton Thermal Representative.
FIGURE 24 - STACK LIMIT SWITCH
Diff erential Pressure Switch
With the circulating pump running, observe the diff erence in pressure between
the heater outlet gauge and the heater inlet gauge. Remove the top cover of
the diff erential pressure switch. Note the original setting of the switch and turn
adjustment knob clockwise until switch trips. The pointer on the switch should
be within 2 psi of the observed pressure diff erence. Reset switch to the original
set point. See Figure 25.
Low Inlet Pressure Switch
Slowly close the valve on outlet of main circulating pump observing heater inlet
pressure gauge. Note the pressure at which the switch trips. This pressure should
be roughly the set point of the switch minus any diff erential that is set.
High Outlet Pressure Switch
Note the original setting of the switch and turn adjustment screw
counterclockwise while observing heater outlet pressure gauge until switch trips.
The pointer on the switch should be within 2 psi of the observed pressure. Reset
switch to the original set point. See Figure 16.
FIGURE 25 - DIFFERENTIAL PRESSURE SWITCH
Manual Reset