tekmar 665 Snow Detector & Melting Control Installation - Manual (Page 11)

11 of 28 © 2012 D 665 - 04/12
The control can be mounted on
a standard DIN rail. First remove
the control from its base and then,
using the hooks and spring clip
on the back of the control, mount
it onto the DIN rail. This will be a
popular option for those who prefer
to mount the control inside a larger
electrical panel. The wiring can enter the
bottom or the back of the
enclosure. Knock-outs pro-
vided in the base allow the
wiring to be run in conduit
up to the enclosure. The
base also has holes that
line up with the mounting
holes of most common
electrical boxes.
Caution: Do not run sensor wires parallel to telephone or power cables. If the sensor wires are located in an area with strong
sources of electromagnetic interference, 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 Sensor Common terminal on the control and not to
earth ground.
All electrical wiring terminates in the two wiring chambers on the control. If the control is to be mounted on an electrical box, the
wiring can be roughed-in at the electrical box prior to installation of the control.
Power must not be applied to any of the wires during the rough-in wiring stage.
Mounting the Outdoor Sensor
Note: The temperature sensor (thermistor) is built into the enclosure.
Remove the screw and pull the front cover off the sensor enclosure.
The sensor can either be mounted directly onto a wall or a 2” x 4” electrical box . When wall mounted, the wiring should enter
through the back or bottom of the enclosure. Do not mount the sensor 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 an insulating
barrier behind the enclosure.
The Outdoor Sensor should be mounted on a wall which best represents the heat load on the building (a northern wall for most
buildings and a southern facing wall for buildings with large south facing glass areas). The sensor should not be exposed to heat
sources such as ventilation or window openings.
The sensor should be installed at an elevation above the ground that will prevent accidental damage or tampering.
Sensor with bottom
entry wiring Sensor with rear
entry wiring Sensor mounted
onto 2" x 4"
electrical box
STEP THREE SENSOR INSTALLATION