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Idiomas disponibles
WIRING
All wiring must conform to local and national electrical codes and ordinances.
Connect in accordance with wiring diagrams provided by the equipment manufacturer. If none are provided, the following repre-
sents a typical installation.
Low
temperature
limit
Temperature
control
L1
Line
L2
Note: Make L1 "HOT" on
120V installation
Circuit showing temperature control control-
ling compressor directly.
BLUE
RED
WHITE
This diagram shows a typical two-circuit
application. Several zones receive re-
frigeration from the same compressor,
but each zone requires its own solenoid
refrigerant valve, temperature control and
limit control.
SETTING THE DIAL
The movable indicator (D) points to the temperature at which
the compressor starts. The fixed indicator (B) points to the
temperature at which the compressor will stop. The difference
between these two indicators is the differential. Follow these
instructions to set the dial:
1. Insert a screwdriver in the adjusting slot (A) and turn the
dial until the fixed indicator (B) points to the temperature 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.
Controls with one circuit (two terminals)
High side
pressure control
(if used)
To
Compressor
Motor
Circuit showing temperature control to open and close refrigerant valve. Suction
pressure control starts and stops compressor through motor starter.
Controls with two circuits (three terminals)
The blue terminal is common. The table below shows the maxi-
mum load allowed between terminals.
LOAD CONDITIONS
Load between Blue and Red
terminals must not exceed:
Load between Blue and White
terminals must not exceed:
Note: Make L1 "HOT" on
120V installation
L1
Line
L2
To
Compressor
Motor
Typical Refrigeration Pump Down Circuit
Note: Make L1 "HOT" on 120V installation
L1
Low temperature
Line
limit
L2
High side
pressure
control
Motor
starter
MAXIMUM ALLOWABLE RATING
Full Load
120V
7.4A
7.4A
Temperature
Temperature
control
control
Low
temperature
limit
B R
W
"D" Movable indicator
(cut-in point)
Temperature
control
Suction
pressure
control
To
Compressor
Motor
Locked Rotor
240V
120V
240V
3.7A
44.5A
22.2A
3.7A
44.5A
22.2A
Low
temperature
limit
B R
W
Blue
White
Red
Valve
Valve
No. 1
No. 2
"B" Fixed indicator
(cut-out point)
"C" Differential
adjusting screw
"A" Adjusting
slot
Solenoid
refrigerant
valve
To
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Units
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