Taylor-Wharton EF-1500 - Manual (Page 11)

BT-481 REV. B
11
Figure 4A: Pressure Switch Control Diagram
The switch should be set to close at pressure below 125 psi and open after a predetermined pressure rise. To check the
setting, vent the container from a pressure greater than 125 psi where the HEATER lamp is off indicating the switch is
open and the heater is not receiving power. As the container vents, observe the container pressure gauge. At
approximately 125 psi the switch should close and the HEATER lamp will light. Close the vent at this point and allow
the heater to cycle until the pressure rises and the HEATER lamp goes out. Note the pressure rise on the pressure gauge
as well as the time interval between ‘heater on’ and ‘heater off’.
Warning:
The pressure switch/control box contains live 120VAC or 240VAC connections. Always disconnect the power
from the wall receptacle before removing the cover from this box for adjustment or maintenance.
If adjustment is needed, unplug the unit and unscrew four Phillips-head screws on top of the pressure control box. The
clockwise movement of the adjusting screw will raise the ‘heater on’ setting; counterclockwise will lower it. The amount
of pressure rise (or the heater ‘off’ setting) will adjust automatically. Move the set point adjustment a small increment in
the desired direction and repeat the venting procedure to determine the new set point. Repeat the process as necessary
until the set point is 125 psi.
Figure 4B: Pressure Switch Adjustment Screw
When the service application requires a higher flowrate than the product specification, an optional super pressure builder
can be purchased from Taylor Wharton. The replacement kit includes the super pressure builder and all necessary fittings
needed to perform the installation at the customer site without emptying the contents of the vessel. Follow the following
steps to replace the stock pressure builder:
adjustment screw