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SC-3 Controller
INSTALLING THE SENSORS
OUTDOOR SENSOR SF P/N 339070
MOUNTING THE SENSOR
Note: The temperature sensor (thermistor) is built into the enclosure.
• Remove the screw and pull the front cover
off the sensor enclosure.
• The enclosure can either be mounted directly
onto a wall or a 2" x 4" electrical box.
When it is wall mounted, the wiring
should enter through the back or bottom
of the enclosure. Do not mount the enclosure
with the conduit knockout facing upwards
as rain could enter the enclosure and
damage the sensor.
• In order to prevent heat transmitted through the wall from affecting the sensor reading, it may be necessary to install and insulating
barrier behind the enclosure.
• The sensor should be mounted on a northern wall of the building. It should not be exposed to heat sources such as ventilation or
window openings. Caution: If sunlight strikes the sensor enclosure or the surface area surrounding it, the system will provide water
temperatures that are not high enough to meet the demand.
• It should be installed at an elevation above the ground that will prevent accidental damage or tampering.
WIRING AND TESTING THE SENSOR
• Connect 18 AWG or similar wire to the two terminals provided in the enclosure and
run the wires from the sensor to the control. Do not run the wires close to and parallel to
telephone or power cables. If the sensor wires are located in an area with strong sources
of electromagnetic interference (EMI), shielded cable or twisted pair should be used or the
wires can be run in a grounded metal conduit. If using shielded cable, the shield wire
should be connected to the Com Sen terminal on the control and not to earth ground.
• Follow the sensor testing instruction that follows and connect the wires to the control.
• Replace the front cover of the sensor enclosure.
UNIVERSAL SENSORS
MOUNTING THE SENSOR SF P/N 339071
Note: These sensors are designed to mount in an immersion well or on a pipe.
For example - If a Sensor is mounted onto a 1" type L copper pipe, there is approximately an 8 second delay between a sudden change in
water temperature and the time the sensor measures the change. This delay increases considerably when steel pipe is used.
It is strongly recommended that an immersion well be used, especially when steel pipe of greater than 1-1/4" is used and also
when large diameter pipes are used and fluid stratification is probable.
Sensor Mounted In Immersion Well
SF P/N 410569
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