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White Rodgers 201-20 Refrigeration Temperature Controls for Walk-In Boxes Manual de instalación Pagina 2

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To line switch
and power supply
Temperature
control
Suction
pressure
control
High side
pressure
control
Motor
starter
Solenoid
refrigerant
valve
INSTALLATION CONT.
Do not twist or uncoil the coiled element on top of
the case. Do not attach conduit to top of control
through the coiled element. Run conduit to bot-
tom of control instead.
CAUTION
5. If the electric conduit goes to a warmer room, put rock
wool around the wires in the conduit where it enters
the control to prevent the flow of warm moist air into
the switch.
WIRING
All wiring should be done in accordance with local and national electrical codes and ordinances.
If the manufacturer of the cooling equipment has supplied
a wiring diagram, follow such recommendations. The
following diagrams show general use of these controls.
Temperature
control
High side
pressure control
(if used)
To line switch
and power supply
HOT
GND
Circuit showing temperature control con-
trolling compressor directly.
Circuit showing temperature control to open and
close refrigerant valve. Suction pressure control
starts and stops compressor through motor starter.
CONTROLS WITH ADJUSTABLE DIFFERENTIAL
The movable indicator points to the temperature at which the
compressor starts. The fixed indicator points to the temperature
at which the compressor will stop. The difference between these
two indicators is the differential.
To set the control, do the following:
1. Use a screwdriver in the slot on the front of the control to turn
the dial so that the fixed indicator (B) points to the tempera-
ture at which the compressor is to stop.
2. Turn the differential adjusting screw (C) until the movable
indicator (D) points to the temperature at which the com-
pressor is to start.
SETTING THE CONTROL
“B” Fixed indicator
(cut-out point)
“C” Differential
adjusting screw
“D” Movable indicator
(cut-in point)
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