LIMITED WARRANTY
The DS-5C is warranted against defects in workmanship and materials for two years from date of sale.
This warranty does not apply to damage resulting from accident, misuse, or alteration nor where connected
voltage is more than 5% above the configured operating voltage, nor to equipment improperly installed or
wired or maintained in violation of this Owner’s Manual. No other written or oral warranty applies. No
employee, agent, dealer or other person is authorized to give any warranties on behalf of DANFOSS.
CAUTION: Read all instructions carefully before installation.
Save this Installation Manual for future reference.
DS-5C
Units returned for warranty repair cannot be modified from shipped condition and leads must
protrude a minimum of 6 inches from the base conduit hub. Repair costs of a modified unit will be
quoted as the unit must be returned to the original, unmodified condition prior to return shipping. The
customer shall be responsible for all costs incurred in the removal and/or reinstallation and shipping of the
product for repairs. Within the limitations of this warranty, inoperative units should be returned, freight
prepaid, to DANFOSS, and we will repair or replace, at our option, at no charge to you with return freight
paid by DANFOSS to destinations within the U.S. and Canada. It is agreed that such repair or
replacement is the exclusive remedy available from DANFOSS and that DANFOSS IS NOT
RESPONSIBLE FOR DAMAGES OF ANY KIND, INCLUDING INCIDENTAL AND CONSEQUENTIAL
DAMAGE. Some states do not allow the exclusion or limitation of incidental or consequential damages so
the above exclusion may not apply to you. The warranty gives you specific legal rights, and you may also
have other rights which vary from state to state.
Input: 100-277 VAC +/- 5%, 47-63 Hz
Control: 2 x 277 VAC @ 30A
Operating Temp: -40°C to +85°C
DANFOSS ELECTRIC HEATING DIVISION
Toronto, Ontario, Canada
TOLL FREE: 866-676-8062
PHONE: 905-285-2050
FAX: 905-285-2055
Visit us on the Internet at: www.LX.Danfoss.com
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Intertek
RAIN/SNOW SENSOR CONTROLLER
INSTALLATION MANUAL
INDICATOR
OFF
POWER
ENCLOSURE TYPE 3R
RAIN/SNOW SENSOR CONTROLLER
DS−5C
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
2 x 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
ACTIVATED
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Intertek
3175102
CONTROL SWITCH
MANUAL ON
AUTOMATIC
STANDBY/RESET
CM
USC
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Need Indoor Monitoring &
Control? Take a Look at the
DANFOSS CDP-2
Simple Installation & Operation at a Competitive Price
Approved CS-xxx Interface Cable Is Also Available
Visit www.goase.com for more information
Danfoss Electric Heating Division Toronto, Ontario, Canada
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-5C or any
controlled equipment.
Pour éviter la décharge électrique déconnectez toute la puissance avant d'ouvrir la couverture du DS-
5C.
Selecting a Mounting Location for the DS-5C
The interleaved grid on the top of the DS-5C 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-5C must be mounted
outdoors, away from furnace vents, dryer vents, and other sources of heat. Note that, when powered, the
DS-5C moisture grid will always remain hot. This is normal. This allows the sensor to continuously melt
snow and evaporate both rain and snow from the grid.
The DS-5C 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-5C 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.
CONTROL/MONITOR JACK
CONFIGURATION SWITCH
TEMPERATURE ADJUST
DELAY OFF ADJUST
SENSITIVITY ADJUST
LOAD1 LOAD2
ALWAYS FOLLOW LOCAL AND NATIONAL ELECTRICAL CODES
Toujours Suivre Les Codes Électriques Locaux Et Nationaux
GRID JACK
2
INPUT POWER
SWITCH JACK
External Control/Monitor Operation
Pin Color Function
1 White GND/Common
2 Red Deice On Mon A
3 Orange Deice On Mon B
4 Black Manual On
5 Green Standby/Reset
monitor relay. This relay, rated at 24 VAC/VDC @ 400 mA, 10W maximum, will close with the load relays
and can be used to externally monitor activation of the sensor. This terminal block is also the connection
point for connecting a CDP-2. Use only tinned, stranded, shielded cable for a reliable connection.
The DS-5C provides external control/monitor capability. Cable
rated 300V up to 18 AWG can be connected to TB2 to access this
feature. Connecting Black (4) to White (1) will activate the
“Manual On” function. Connecting Green (5) to White (1) will
activate the “Standby/Reset” function. See the “Manual Override
Switch Function” for a description of these modes. The
Red/Orange (2/3) leads are connected to an internal low power
Power & Activation Indicator
A green lamp shines through a lens on the cover of the DS-5C to indicate operational status. If this lamp is
OFF the DS-5C is not receiving power. If this lamp is steady ON the DS-5C is powered but not triggered.
If this lamp is FLASHING the DS-5C is powered on and triggered, the main relays are closed, and attached
equipment should be activated. Note that, even though snow or rain may have stopped, the DS-5C
indicator will continue to flash during the Delay-Off drying cycle.
Moisture Grid Maintenance & Replacement
It is recommended that the DS-5C be powered down and the grid wiped clean with clear water at least
once every 4 months. Heavy deposits may be removed using a non-metallic scouring pad (Scotch-BriteTM
or equivalent.) However, after a number of years, the corrosive elements left behind when water is
evaporated out of the moisture grid will eventually damage the grid rings. The moisture grid can be easily
replaced by ordering and installing an MG-5 “Moisture Grid Assembly” and following the procedure below:
THIS PROCEDURE SHOULD ONLY BE PERFORMED BY QUALIFIED PERSONNEL!
CE PROCÉDÉ DEVRAIT SEULEMENT ÊTRE EXÉCUTÉ PAR LE PERSONNEL QUALIFIÉ!
Open all power and load breakers connected to the DS-5C. Open the front cover and remove the cable
connector from the Grid Jack. While holding the reducing bushing, unscrew and remove the old moisture
grid. Pass the new moisture grid connector through the top hole and screw the assembly into the reducing
bushing. Tighten the grid hand tight plus ¼ turn. Connect the new cable to the Grid Jack. Confirm that the
four connector pins are properly aligned with the jack. Close the front cover, confirming that the front cover
gasket is properly sealed. Reapply power.
Use Care When Replacing the Front Cover. Do Not Pinch the Gasket or Overtighten the Screws.
Preseason Snow Detection Testing
It is always a good idea to test the operation of the DS-5C prior to the winter season. Procure some clean
water and, if the outdoor temperature is above the trigger point, a can of spray component cooler (Radio
Shack Part #64-4321 or equivalent.) Clean the moisture grid following the procedure outlined above and
allow it to dry. Apply power to the DS-5C, drip some of the water onto the moisture grid, then spray the
temperature sensor protruding from the base of the enclosure with the component cooler. Once the
temperature sensor has reached the trigger point with water still present on the grid the DS-5C will activate.
The user should hear the internal control relays close and see the green lamp blink. Proper operation has
been confirmed. Allow the grid to dry completely. To clear the Delay-Off timer place the override switch
into “Standby/Reset”, and then back to the “Automatic” position.
7
DS−5C
POWER SUPPLY
LOAD CENTER
CB
CB
NEUTRAL BUS BAR
BROWN
BLUE
YELLOW
RED
PUMP
LOW VOLTAGE
BOILER
120VAC In, 120VAC Circulation Pump, 24VAC Boiler
DS−5C
POWER SUPPLY
BROWN
LOAD CENTER
CB
CB
NEUTRAL BUS BAR
BLUE
277VAC In, Dual 277VAC Load, Heat Cable or Similar (Also Applies to 120VAC)
These are just some of the possible wiring schemes that can be used to connect the DS-5C 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!
6
YELLOW
RED
277VAC LOAD
277VAC LOAD
Setting the Configuration Switches and Adjustments
The following paragraphs and table outline the operating modes for the DS-5C 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 DS5C. The timer allows the DS-5C 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-5C 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 mode. Care should be exercised in using this mode as the potential
exists for ice to be formed on the melting surface.
The DS-5C precipitation sensor is very sensitive and can detect a single
snow flake or rain drop. However, if the DS-5C 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
3
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-5C 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.
Typical Load Wiring
The main relays are dry contacts and do not supply power directly to your load
The Yellow load leads and Red load leads connect to main relays 1 & 2 respectively. Both relays in the
DS-5C activate together at all times. These relays act as normally open switches and are fully isolated
from each other. Each relay is intended to switch a separate circuit. Switching capacity of the DS-5C is
30A per circuit, 2 separate circuits. While not as convenient as directly supplying power for the load, dry
contacts allow you to operate the DS-5C from one voltage while controlling loads of a different voltage
without adding an external relay or contactor. For example, the DS-5C can be powered from 120VAC but
can directly control a 24VAC signal for a boiler system and line voltage for a pump or the DS-5C can
control two separate 277VAC heat cables. The following diagrams show some possible wiring schemes for
connecting the DS-5C 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.
DO NOT ATTEMPT TO INCREASE SWITCHING CAPACITY BY WIRING THE RELAYS IN PARALLEL
Ne Pas Tenter D'Augmenter La Capacité De Commutation Par Le Câblage Des Relais En Parallèle
DO NOT USE THE DS-5C ENCLOSURE AS A JUNCTION BOX
Ne Pas Employer Une DS-5C As Une Boîte De Jonction
DS−5C
POWER SUPPLY
LOAD CENTER
BROWN
BLUE
YELLOW
RED
240VAC LOAD
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 relays, activating
the controlled equipment. The “STANDBY/RESET” position prohibits triggering of the unit, clears any
active delay timer, and opens the load relays. 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-5C 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.
4
CB
240VAC LOAD
CB
240VAC In, Dual 240VAC Load, Heat Cable or Similar
5
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