BROWN
BLUE
YELLOW
YELLOW
LOAD
24 VAC/VDC SENSOR SUPPLY
SECONDARY POWER SUPPLY
DS−824C
POWER INF
24 VAC/VDC Sensor Supply, Secondary Voltage Out
BROWN
BLUE
YELLOW
YELLOW
LOAD
24 VAC/VDC SUPPLY
DS−824C
POWER INF
24VAC/VDC Sensor Supply, Dry Contact Thermostat-Style Control
These are just some of the possible wiring schemes that can be used to connect the DS-824C to your load
for control. Remember, these are only suggestions.
You should always consult a qualified
electrician or inspector to assure conformance with applicable local and national
electrical codes! Remember, this device is designed for low voltage use only!
6
DO NOT DRILL HOLES THROUGH THE ENCLOSURE FOR MOUNTING!
NE FONT PAS LES TROUS DE FORET PAR LA BOÎTE POUR LE SUPPORT!
This can allow water into the enclosure. It is recommended that a weatherproof condulet or junction box be
mounted below the DS-824 for termination of the power and load pigtails to the building wiring.
Use Care When Replacing the Front Cover. Do Not Pinch the Gasket or Overtighten the Screws.
TEMPERATURE ADJUST
DELAY OFF ADJUST
SENSITIVITY ADJUST
CONFIGURATION SWITCH
GRID TERMINAL
CONTROL/MONITOR JACK
SWITCH JACK
LOAD
INPUT POWER
Setting the Configuration Switches and Adjustments
The following paragraphs and table outline the operating modes for the DS-824C
and explain the functions of the adjustments. Trigger temp (
TT
) is adjustable from
34
°
F-44
°
F (1
°
C-6
°
C) using the TRIG TEMP control. When ambient air
temperature (
AT
) is below this setting precipitation is assumed to be snow. When
above this setting, precipitation is assumed to be rain.
The DEL configuration switch activates the Delay-Off drying cycle timer on the DS-
824C. The timer allows the DS-824C to continue to operate and dry the heated surface through
evaporation once precipitation has stopped. The drying cycle reduces the
chance of moisture left behind refreezing into ice. This timer is restarted by
each sensor trigger. Therefore, the DS-824C will continue to operate as long
as it is triggered, then for the Delay-Off period once the trigger clears. All
"sensor" modes (DEL off) provide a 2 minute Delay-Off time. When in
"controller" mode (DEL on) the Long Delay (LD) configuration switch
determines the time span of the drying cycle. The Delay-Off time can be adjusted from 30-90 minutes (LD
Off) or 2-6 hours (LD On) using the DELAY OFF control.
The DS-824C precipitation sensor is very sensitive and can detect a single snow flake or rain drop.
However, if the DS-824C is mounted in an area susceptible to high winds, overhanging trees, or blowing
ground snow, nuisance triggering may occur. While proper placement is the best remedy, the
SENSITIVITY control can also be used to reduce nuisance triggering. An internal timer checks the
precipitation sensor for moisture and compares cleared time with triggered time.
3
