© 2007
D 039 - 05/07
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STEP THREE
WIRING THE 039
Run 18 AWG twisted pair or similar wire between the 039 and the control. Insert the wires
through the hole provided in the back of the 039 enclosure and connect them to the Com
and tekmar Net™(tN2) terminals. Do not run the wires parallel to telephone or power lines
as this may interfere with the operation of the 039. If the 039 wires are located in an area
with strong sources of electromagnetic noise, shielded cable should be used or the wires
can be run in a grounded metal conduit.
NOTE:
Do not apply power to the 039. The 039 is to be wired directly
to the control. The connection between the control and the 039 is
polarity sensitive. The Com terminal of the 039 must be connected
to the appropriate terminal of the control. If the wires are reversed,
the 039 will not function and the control will display a short circuit
error for the tekmar Net™ (tN2) device.
STEP FOUR
INSTALLING THE FRONT COVER
Align the hinges on the bottom of the front cover with the bottom of the 039 mounting base.
Pivot the front cover around the bottom hinges and push the top against the mounting base
until it snaps firmly in place.
2
Com
1
tN2
Settings
LIMITING THE TIME RANGE
Holding Clip
The time range on the 039 can be limited in order to
avoid extreme time settings or any tampering with the
setting.
•• Turn the dial until the desired time is at the bottom
of the 039.
•• Remove the front cover by following Step One of
the Installation procedure.
• Lift and pull the scale off the dial. Be careful not
to turn the dial while removing the scale. With the
scale off, a series of small holes will be visible
around the dial. Behind the dial there is a post
which can be used to limit the rotation of the dial.
Two aluminum limit pins are provided in the dial.
SETTING A MINIMUM TIME LIMIT
Remove one of the limit pins and re-insert it into the hole that is slightly to the left of the post
at the bottom of the dial. With the pin in place the dial should only rotate clockwise from its
current position as the counter-clockwise rotation is now restricted by the pin.
The 039 can be used to set the desired running time of the snow melting system. Turn the
039’s dial until the desired running time is displayed in the window.
NOTE:
If an infinite (NO LIMIT) run time is selected, the snow melting system runs
continuously until WWSD or CWCO occurs, or someone presses the start / stop button
on the 039.