Ouellet DS-2C - Manual (Page 5)

The relay inside the DS-2C acts as a switch. While not as convenient as directly supplying power for the
load this allows you to operate the DS-2C from one voltage while controlling a load of a different voltage
without adding an external relay or contactor. For example, the DS-2C can be powered from 120VAC but
can directly control a 24VAC signal for a boiler system or 277VAC for heating wire. The following diagrams
show some possible wiring schemes for connecting the DS-2C to your load. Your load may be a direct
connection to heat cable, a heater, a contactor coil, or a control voltage. For clarity the green safety
GROUND leads are not shown.
BROWN
BLUE
YELLOW
YELLOW
LOAD
SWITCHED 240VAC
LOAD CENTER
DS−2C
POWER SUPPLY
CB
Recommended Switch Settings by Function
Function Trigger LD Off LD On LTC DEL RAIN SNOW
Snow sensor w\o LTC TT>AT 2 Min 2 Min OFF OFF OFF ON
Snow sensor w\LTC TT>AT>5°F 2 Min 2 Min ON OFF OFF ON
Snow controller w\o LTC TT>AT 30-90 Min 2-6 Hr OFF ON OFF ON
Snow controller w\LTC TT>AT>5°F 30-90 Min 2-6 Hr ON ON OFF ON
Precipitation sensor Not Used 2 Min 2 Min X OFF ON ON
Precipitation controller Not Used 30-90 Min 2-6 Hr X ON ON ON
Rain sensor AT>TT 2 Min 2 Min X OFF ON OFF
Rain controller AT>TT 30-90 Min 2-6 Hr X ON ON OFF
LT thermostat w\o LTC TT>AT 2 Min 2 Min OFF X OFF OFF
LT thermostat w\LTC TT>AT>5°F 2 Min 2 Min ON X OFF OFF
X = Do Not Care
Fine Adjustment for Efficient Operation
The DS-2C is shipped with the TRIG TEMP and DELAY OFF adjustments in the center position,
representing 39°F (3.9°C) and 60 minutes of Delay-Off time respectively. It is also set for highest
SENSITIVITY. Depending on local conditions the user may find that fine adjustment of the controls may
provide more satisfactory operation. If the sensor does not trigger during very wet snows the trigger
temperature may need to be adjusted higher. Constant triggers from snow falling from trees or overhangs
may be reduced by adjusting SENSITIVITY. The Delay-Off time can also be adjusted to provide clean
melt-off without excessive running time. Fine adjustment can both save operating expense and provide
more reliable operation. However, to keep reliability high, always make adjustments in small increments.
Use Care When Replacing the Front Cover. Do Not Pinch the Gasket or Overtighten the Screws.
Manual Override Switch Operation
An override switch mounted on the side is provided for testing and special operational requirements.
Placing the switch in the AUTOMATIC position will allow the sensor to operate normally, activating the
controlled equipment as needed. Placing the switch in MANUAL ON will close the load relay, activating the
controlled equipment. The “STANDBY/RESET” position prohibits triggering of the unit, clears any active
delay timer, and opens the load relay. In order to reduce excessive runtime for the heater the “Manual
On” mode will remain in effect for up to 40 hours, then return to “Automatic” mode, even if the
switch is still in the “Manual On” position. However, any trigger of the system will restart the 40
hour “Manual On” timer. You may put the DS-2C back into “Manual On” mode by switching to
AUTOMATIC, then back to MANUAL ON. This will also restart the 40 hour timer.
If the override switch is placed in MANUAL ON for less than 2 seconds, then switched back to
AUTOMATIC the controller will execute one Delay-Off cycle. This can be used to clear a frost, hail, or
drifted snow buildup without the danger of leaving the system in a continuous “Manual On” condition.
“Standby/Reset” can still be used to clear this Delay-Off cycle.
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Typical Load Wiring
The Yellow load leads are N.O. contacts and do not supply power directly to your load
NEUTRAL BUS BAR
CB
BROWN
BLUE
YELLOW
YELLOW
LOAD
DS−2C
SWITCHED 120VAC
NEUTRAL
LOAD CENTER
POWER SUPPLY
120VAC In, 120VAC Load, Heat Cable or Similar (Also Applies To 277VAC)
240VAC In, 240VAC Load, Heat Cable or Similar
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