tekmar 664 Snow Detector & Melting Control Installation - Manual (Page 10)

10 of 36 © 2009 D 664 - 07/09
Remote Start / Stop Module 039
The snow melting system is enabled by pressing the button on the front of the 039. While
the zone(s) is coming up to temperature, a green indicator light fl ashes on the front of
the 039. Once the zone(s) is up to temperature and the RUN TIME is counting down, the
green indicator light on the front of the 039 is on solid.
7 9 8
Start / Stop
Stop Start
19 20
Melt / Idle
Demand
24 to 230 V (ac)
L
N
Idle Demand
Melt Demand
Water Detection Sensitivity (SENSTVTY)
The 664 has a Sensitivity setting which compensates for varying outdoor conditions which could affect how the moisture detector
in the 090 interprets the presence of moisture. This adjustable setting is available through the SENSTVTY item in the ADJUST
menu of the control. As snow becomes contaminated with dirt, and as the sensor itself becomes dirty, the control may incorrectly
indicate the presence of water. If this condition occurs, clean the surface of the sensor and / or turn down the SENSTVTY setting. If
the snow in your area is very clean, the SENSTVTY setting may need to be increased before snow is detected. If AUTO is selected,
the control automatically adjusts the sensitivity level used to detect moisture.
Remote Display Module 040
The snow melting system is enabled by pressing the
▲
button on the 040 while in the
VIEW menu. The 040 then displays the RUN TIME setting to allow the user to adjust
it. Once the snow melting system is enabled, the word STRT is displayed for at least 5
seconds in the Status item of the appropriate zone while in the VIEW menu.
External Melt Demand (DIP switch set to Melt Demand)
The snow melting system is enabled when a voltage between 24 and 240 V (ac) is applied
across the Melt / Idle Demand terminals (19 and 20). An external melt demand must be
present for at least 4 seconds in order to start the snow melting system. If the RUN TIME
reaches 0:00 and the external melt demand is still present, the control continues melting
until the external melt demand is removed or the system is otherwise stopped.
Note: This operation only occurs if the Idle Demand / Melt Demand DIP switch is set to
the Melt Demand position.
AUTOMATIC MELTING ENABLE (Snow / Ice Sensor 090)
The 664 can use the Snow / Ice Sensor 090 to provide an automatic melting enable signal
to start the snow melting system. The control continually monitors the 090 for the presence
of moisture. Once moisture is detected, the Water pointer is displayed in the LCD and the
snow melting system is enabled.
Note: In addition to the Snow / Ice Sensor 090 connected to the 664, the Zone 1 item in the
ADJUST menu must be set to AUTO in order for the automatic melting enable function to
work. Therefore, if zone 1 is turned off, the 090 can not provide a melting enable signal to
start the Melting mode for zone 2.