Taylor-Wharton VJ Bulk Tank - Manual (Page 34)

tank decreases and the pressure in the suction line will decrease causing the switch to open, shutting
off the Condenser Unit.
Setting the Pressure Control Switch: - After the refrigeration system has been installed, is operating
properly, and the tank has been filled with product set the Pressure Control Switch. Initially set the
“cut in” pressure on the switch at the top of its range. Also set the “cut out” pressure at the bottom of
its range. Closely monitor tank pressure. As the tank pressure over time is allowed to rise to point
where the refrigeration is necessary (approximately 300 psig) lower the “cut in” pressure until the
Condenser Unit just comes on. Continue to monitor tank pressure. When the pressure decreases to
the desired point increase the “cut out” pressure until the Condenser Unit cuts off.
Thermostatic Expansion Valve and Bulb
The Thermostatic Expansion Valve and Bulb, Sporlan Model # BFS-AA-ZP, causes a pressure drop
in the liquid refrigerant coming from the Condenser Unit. This pressure drop flashes the liquid
refrigerant causing a decrease in temperature. As the temperature of the carbon dioxide in the tank is
decreased the Bulb senses a cooler refrigerant temperature at the outlet of the Evaporator Coil and it
causes the valve to close further. The valve and bulb should be installed in a horizontal position.
Insulate the suction line and bulb starting from the tank.
Filter / Drier and Sight-glass
The Filter / Drier, Catch-All Model # C-052, and the Sight-glass, See-All Model # SA-12FM, should
be installed between the Condenser Unit and the Expansion Valve.
34