Ouellet DS-2C User Manual

CAUTION: Read all instructions carefully before installation.
Save this Installation Manual for future reference.

DS-2C

RAIN/SNOW SENSOR CONTROLLER

INSTALLATION MANUAL

AUTOMATED
SYSTEMS
ENGINEERING

ENCLOSURE TYPE 3R

RAIN/SNOW SENSOR CONTROLLER

DS−2C

DANGER

CONFORMS TO UL STD 508
CERTIFIED TO CAN/CSA STD C22.2 NO. 14

INPUT
100−277V AC 0.15 A 50/60 Hz
CONTROL
30 A 277V AC, 20 A 28V DC

WARNING: THIS UNIT MAY BE SUPPLIED BY MORE THAN ONE BREAKER

AVERTISSEMENT: IL PEUT Y AVOIR UN CIRCUIT SECONDAIRE SOUS TENSION

INDICATOR

OFF

POWER

ACTIVATED

L

C

Intertek

3175102

CONTROL SWITCH

MANUAL ON
AUTOMATIC
STANDBY/RESET

CM

US

I

D

S

T

E

Manufactured By

AUTOMATED
SYSTEMS
ENGINEERING

2519 East Saint Vrain St Colorado Springs, Colorado 80909

General Safety Instructions

1. THIS UNIT SHOULD BE INSTALLED, OPENED, AND REPAIRED BY QUALIFIED PERSONNEL
ONLY!

CETTE UNITÉ DEVRAIT ÊTRE INSTALLÉE, OUVERTE, ET RÉPARÉE PAR LE PERSONNEL

QUALIFIÉ SEULEMENT!

2. To avoid shock hazard do not open the front cover with power connected to the DS-2C or any controlled
equipment.

Pour éviter la décharge électrique déconnectez toute la puissance avant d'ouvrir la couverture du DS-

2C.

Selecting a Mounting Location for the DS-2C

The interleaved grid on the top of the DS-2C is the precipitation or “moisture" sensor. The brass cylinder protruding from
the bottom of the enclosure is the temperature sensor. For reliable rain and snow detection the unit must be mounted in
a location that exposes the moisture sensor to a clear view of the sky. The unit should not be mounted directly under
eaves or overhangs. It should not be mounted so close to the ground that it may become buried in snow. For proper
temperature detection the DS-2C must be mounted outdoors, away from furnace vents, dryer vents, and other sources
of heat. Note that, when powered, the DS-2C moisture grid will always remain hot
to continuously melt snow and evaporate both rain and snow from the grid.

The DS-2C can be mounted by screwing the base conduit hub onto an appropriate size free-standing conduit or by
using the mounting holes in each corner of the enclosure.

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 causing a potential shock hazard. It is recommended that a weatherproof
junction box be mounted below the DS-2C 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.

. This is normal. This allows the sensor

CONTROL/MONITOR JACK

CONFIGURATION SWITCH

TEMPERATURE ADJUST

DELAY OFF ADJUST

SENSITIVITY ADJUST

GRID JACK

INPUT POWER

SWITCH JACK

LOAD

ALWAYS FOLLOW LOCAL AND NATIONAL ELECTRICAL CODES

TOUJOURS SUIVRE LES CODES ÉLECTRIQUES LOCAUX ET NATIONAUX

2

Setting the Configuration Switches and Adjustments

The following paragraphs and table outline the operating modes for the DS-2C 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 DS­2C. The timer allows the DS-2C 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-2C 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 Low Temperature Cutoff (LTC) option is typically used on snow melting
systems with limited output capacity where melting cannot be maintained at
very low temperature. If selected, the snow sensor will clear a trigger below
5°F (-15°C) even if snow is still falling. It will resume normal operation
above 9°F (-13°C). However, the sensor will remember if it was triggered
before the drop below 5°F or if snow was detected during the cold period. If
so, the sensor will execute one Delay-Off cycle when the temperature rises
above 9°F in order to melt any snow left behind during the cold period. This
is referred to as RECOVER

exists for ice to be formed on the melting surface.

mode. Care should be exercised in using this mode as the potential

The DS-2C precipitation sensor is very sensitive and can detect a single snow flake or rain drop. However,
if the DS-2C 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. The highest sensitivity
setting (toward MORE) triggers on first detection. As the control is
adjusted clockwise precipitation must be detected for a longer period to be
considered valid. The lowest sensitivity setting (toward LESS) requires
120 seconds of detection before the unit triggers. If a trace amount of

snow blows onto the grid from a drift or overhang it will likely be melted
and evaporated in less than a minute. Similarly, a very light snowfall may also clear quickly from the grid.
If these conditions should be ignored by the sensor the SENSITIVITY control can be adjusted as required.
However, to prevent non-triggering during a true event, it is recommended that the user start at highest

sensitivity (MORE), then adjust while monitoring operation over time.

THE UNIT MUST BE IN STANDBY/RESET TO CHANGE CONFIGURATION SWITCHES

L'appareil doit être en mode STANDBY/RESET pour modifier commutateurs de configuration

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