White Rodgers 241-2 - Manual (Page 2)

WIRING
SETTING THE DIAL
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.
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.
Temperature
control
Low
temperature
limit
High side
pressure control
(if used)
To
Compressor
Motor
Line
L1
L2
Note: Make L1 “HOT” on
120V installation
Circuit showing temperature control control-
ling compressor directly.
Temperature
control
Low temperature
limit
Suction
pressure
control
High side
pressure
control
Motor
starter
Solenoid
refrigerant
valve
To
Compressor
Motor
Line
L1
L2
Note: Make L1 “HOT” on 120V installation
Circuit showing temperature control to open and close refrigerant valve. Suction
pressure control starts and stops compressor through motor starter.
"B" Fixed indicator
(cut-out point)
"C" Differential
adjusting screw
"D" Movable indicator
(cut-in point)
"A" Adjusting
slot
Controls with one circuit (two terminals)
Controls with two circuits (three terminals)
BLUE RED
WHITE
240V
22.2A
22.2A
LOAD CONDITIONS
MAXIMUM ALLOWABLE RATING
Full Load Locked Rotor
120V
7.4A
7.4A
120V
44.5A
44.5A
240V
3.7A
3.7A
Load between Blue and Red
terminals must not exceed:
Load between Blue and White
terminals must not exceed:
To
Additional
Units
B R
W
B R
W
Valve
No. 2
Valve
No. 1
Blue
White
Red
To
Compressor
Motor
Line
L1
L2
Note: Make L1 “HOT” on
120V installation
Temperature
control
Temperature
control Low
temperature
limit
Low
temperature
limit
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.
Typical Refrigeration Pump Down Circuit
The blue terminal is common. The table below shows the maxi-
mum load allowed between terminals.