Page 22 – Bulletin 100-50-9.1
5.6.2 WIRING
With controller unpowered, carefully route the door switch
cable to the controller. Take caution to route the cable away
from sharp edges and hot or moving objects. Ensure the
terminal screws on the controller are backed all the way out.
Under the “Digital Inputs” section on the controller, insert
one lead of the switch into “Ref”. Insert the other lead into
“Door”. The leads are not polarized and may be placed in
either location. Tighten the terminal screws to 3-5 in.-lb.
Carefully tug the leads to ensure they are secure. See the
following figure.
5.7 POWER SUPPLY
5.7.1 MOUNTING
The S3C Case Control has been designed to use 24VDC
from an external power supply. The Sporlan external power
supply is IP67 for damp locations and uses common supply
voltages, such as 120VAC and 240VAC. The supply may be
mounted in the same panel as the S3C or remote mounted in
the case kick panel or valence. Use two #6 sheet metal screws.
3.94 in. (100mm)
1.97 in.
(50mm)
Magnet
3mmt AL (0.118 in.t)
L-Bracket
1.97 in.
(50mm)
Armored Cable
Contact Assembly
4.33 in. (110mm)
1.57 in.
(40mm)
5.7.2 WIRING
Ensure high voltage supply is off. Permanently attach the
high voltage wiring to the blue (AC Neutral) and brown
(AC Line) leads of the power supply. Carefully route the low
voltage red (24VDC +) and black (24VDC -) output wires
from the power supply to the controller. Take caution to
route the cable away from sharp edges. Ensure the terminal
screws on the controller are backed all the way out. Insert
the leads of the sensor wire into “Supply” location on
the controller, see chart below for sequence. Tighten the
terminal screws to 3-5 in.-lb. Carefully tug the leads to
ensure they are secure. See the following figure.
5.8 RELAYS
The S3C Case Control has internal relays for the liquid line
solenoid valve, evaporator fans, lights and defrost. In many
cases, the internal relays will cover the load ratings required
of the system so direct wiring is preferred. For higher loads,
such as defrost heaters, it is necessary to add an additional
relay (or contactor) to switch the load.
5.8.1 DEFROST RELAY
A defrost relay (or contactor) is required on all systems that
draw more than 6A for the heater circuit. e S3C will pilot
the contactor to regulate the defrost heaters. e contactor
may be installed in the same panel as the controller, or
remotely located in the case kick panel. Follow industry
electrical standards safety when wiring.
5.8.2 FAN RELAY
An evaporator fan relay (or contactor) is required on all
systems that draw more than 6A for the fan circuit. e S3C
will pilot the contactor to regulate the fans. e contactor
may be installed in the same panel as the controller, or
remotely located in the case kick panel. Follow industry
electrical standards safety when wiring.
100-240 VAC
NEUTRAL
LINE
24VDC
TO CONTROLLER
POSITIVE
NEGATIVE
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