Ase Ds-824c User manual

LIMITED WARRANTY

The DS-824C 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

oltage is more than 5% abo e the configured operating oltage, nor to equipment improperly installed or

wired or maintained in iolation of this Owner’s Manual. No other written or oral warranty applies. No

employee, agent, dealer or other person is authorized to gi e any warranties on behalf of ASE.

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 remo al or reinstallation and shipping of the product for repairs.

Within the limitations of this warranty, inoperati e units should be returned, freight prepaid, to ASE, and we

will repair or replace, at our option, at no charge to you with return freight paid by ASE. It is agreed that

such repair or replacement is the exclusi e remedy a ailable from ASE and that ASE 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 abo e exclusion may not apply to you. The warranty gi es you specific legal rights, and you may also

ha e other rights which ary from state to state.

AUTOMATED SYSTEMS ENGINEERING, INC.

2519 E SAINT VRAIN ST

COLORADO SPRINGS, COLORADO 80909

PHONE: 719-599-7477 FAX: 719-599-7482

Visit us on the Internet at: www.goase.com

Need Indoor Monitoring & Control?

Take a Look at the ASE CDP-2

Simple Installation & Operation at a Competiti e Price

Visit www.goase.com for more information

CAUTI N: Read all instructions carefully before installation.

Save this Installation Manual for future reference.

DS-824C

RAIN/SNOW SENSOR CONTROLLER

INSTALLATI N MANUAL

RAIN/SNOW SENSOR CONTROLLER

AVERTISSEMENT: PAS POUR LE CONTRÔLE DE HAUTE TENSION

30 A 24V AC, 20 A 28V DC

22−28V AC/DC 500mA 50/60 H

ENCLOSURE TYPE 3R

CONTROL

INPUT CONTROL SWITCH

STANDBY/RESET

MANUAL ON

AUTOMATIC

WARNING: NOT FOR HIGH VOLTAGE CONTROL

ACTIVATED

DS−824C

ENGINEERING

AUTOMATED

SYSTEMS

INDICATOR

POWER

OFF

Manufactured By

AUTOMATED

SYSTEMS

ENGINEERING

2519 East Saint Vrain St Colorado Springs, Colorado 80909

GUTTER

SENSOR

DRIP EDGE

Moisture Sensor Mounting & Termination

The remote DS-824C precipitation/moisture sensor may be

mounted in a number of ways depending on the application. The

sensor head operates at a safe 12VDC and can withstand

immersion in water. For roof and gutter deicing applications the

sensor head may be mounted against the back of the gutter with a

1” “C”-style conduit clamp. Allow part of the sensor grid to be

exposed to snowfall. The sensor will initially trigger when snow

starts falling and will remain triggered as long as the roof/gutter

heater continues to drip melted snow from the roof edge when

temperatures are below freezing. The sensor may also be installed

inside and near the top of the downspout using a 1” conduit

hanger and mounting plate. As water is melted in the gutter it will

run to the downspout,

hitting and retriggering

the sensor. We do not recommend laying the sensor on its side

in the gutter. Constant immersion will corrode the grid and the

sensor may miss a windblown snow trigger.

The sensor cable comes preinstalled but may be shortened as

needed. Strip the outer insulation and shield from the cable and

terminate each conductor following the color code printed on

the circuit board for TB-1; (W)hite, (G)reen, (R)ed, (B)lack. The

bare drain wire should be installed into the (S)hield terminal.

Tighten the strain relief on the DS-824C enclosure. The sensor

cable may NLY be extended using the ASE EX-50

Extension Kit. Otherwise, erratic operation may result.

Selecting a Mounting Location for the DS-824C Enclosure

The brass cylinder protruding from the bottom of the enclosure is the temperature sensor. For proper

temperature detection the DS-824C must be mounted outdoors, away from furnace ents and other

sources of heat. Note that, when powered, the DS-824C moisture grid will always remain hot. This is

normal. This allows the sensor to continuously melt snow and e aporate both rain and snow from the grid.

The DS-824 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.

External Control/Monitor Operation

The DS-824C pro ides external control/monitor capability.

Shielded cable can be connected to TB2 to access this feature.

Connecting Black (4) to White (1) will acti ate the “Manual On”

function. Connecting Green (5) to White (1) will acti ate the

“Standby/Reset” function. See the “Manual O erride Switch

Function” for a description of these modes. The Red/Orange

(2/3) leads are connected to an internal low power monitor relay.

This relay, rated at 24 VAC/VDC at 400 ma, will close with the load relay and can be used to externally

monitor acti ation of the sensor. This terminal block is also the connection point for installing a CDP-2

interface cable. Note that the CS-1 described in the CDP-2 Manual is not required.

Power & Activation Indicator

A green lamp shines through a lens on the co er of the DS-824C to indicate operational status. If this lamp

is FF the DS-824C is not recei ing power. If this lamp is steady N the DS-824C is powered but not

triggered. If this lamp is FLASHING the DS-824C is powered on and triggered, the main relay is closed,

and attached equipment should be acti ated. Note that, e en though snow or rain may ha e stopped, the

DS-824C indicator will continue to flash during the Delay-Off drying cycle.

Preseason Snow Detection Testing

It is always a good idea to test the operation of the DS-824C prior to the winter season. Procure some

clean water and, if the outdoor temperature is abo e the trigger point, a can of spray component cooler

(Radio Shack Part #64-4321 or equi alent.) Clean the moisture grid following the procedure outlined abo e

and allow it to dry. Apply power to the DS-824C, 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-824C will

acti ate. The user should hear the internal control relay 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

o erride switch into “Standby/Reset”, and then back to the “Automatic” position.

Moisture Grid Maintenance & Replacement

It is recommended that the DS-824C be powered down and the grid wiped clean with clear water at least

once e ery 4 months. Hea y deposits may be remo ed using a non-metallic scouring pad (Scotch-BriteTM

or equi alent.) Howe er, after a number of years, the corrosi e elements left behind when water is

e aporated out of the moisture grid will e entually damage the grid rings. The moisture grid can be easily

replaced by ordering and installing an MG-6 “Moisture Grid Assembly.” Reference the “Moisture Sensor

Mounting & Termination” section for information on replacing the precipitation grid.

Use Care When Replacing the Front Cover. Do Not Pinch the Gasket or vertighten the Screws.

Maintain your enclosure's integrity and improve reliability

Specify the ASE EX-50 when precipitation sensor extension is required

General Safety Instructions

1. THIS UNIT SH ULD BE INSTALLED, PENED, AND REPAIRED BY QUALIFIED PERS NNEL

NLY!

CETTE UNITÉ DEVRAIT ÊTRE INSTALLÉE, UVERTE, ET RÉPARÉE PAR LE PERS NNEL

QUALIFIÉ SEULEMENT!

2. To a oid shock hazard do not open the front co er with power connected to the DS-824C or any

controlled equipment. Limit input oltage to 22-28 VAC/VDC

Pour é iter la décharge électrique déconnectez toute la puissance a ant d'ou rir la cou erture du DS-

824C. Limiter la tension d'entrée à 22-28 VAC/VDC

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

DOWNSPOUT

SENSOR

MOUNTING

PLATE

1" CONDUIT

CLAMP

BROWN

BLUE

YELLOW

LOAD

24 VAC/VDC SENSOR SUPPLY

SECONDARY POWER SUPPLY

DS−824C

POWER INF

24 VAC/VDC Sensor Supply, Secondary Voltage ut

BROWN

BLUE

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!

D N T DRILL H LES THR UGH THE ENCL SURE F R M UNTING!

NE F NT PAS LES TR US DE F RET PAR LA B ÎTE P UR LE SUPP RT!

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 vertighten 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

abo e this setting, precipitation is assumed to be rain.

The DEL configuration switch acti ates 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

e aporation 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) pro ide 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 ery sensiti e and can detect a single snow flake or rain drop.

Howe er, if the DS-824C is mounted in an area susceptible to high winds, o erhanging 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 sensiti ity setting (toward MORE) triggers on first detection. As the control is adjusted

clockwise precipitation must be detected for a longer period to be considered alid. The lowest sensiti ity

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 o erhang it will likely be melted and e aporated in less than a minute.

Similarly, a ery 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. Howe er, to pre ent non-triggering

during a true e ent, it is recommended that the user start at highest sensitivity (M RE), then adjust

while monitoring operation over time.

The Low Temperature Cutoff (LTC) option is typically used on snow melting

systems with limited output capacity where melting cannot be maintained at

ery low temperature. If selected, the snow sensor will clear a trigger below

5°F (-15°C) e en if snow is still falling. It will resume normal operation

abo e 9°F (-13°C). Howe er, 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

abo e 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 UNIT MUST BE IN STANDBY/RESET T CHANGE C NFIGURATI N SWITCHES

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

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-824C 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 respecti ely. It is also set for highest

SENSITIVITY. Depending on local conditions the user may find that fine adjustment of the controls may

pro ide more satisfactory operation. If the sensor does not trigger during ery wet snows the trigger

temperature may need to be adjusted higher. Constant triggers from snow falling from trees or o erhangs

may be reduced by adjusting SENSITIVITY. The Delay-Off time can also be adjusted to pro ide clean

melt-off without excessi e running time. Fine adjustment can both sa e operating expense and pro ide

more reliable operation. Howe er, to keep reliability high, always make adjustments in small increments.

Use Care When Replacing the Front Cover. Do Not Pinch the Gasket or vertighten the Screws.

Manual Override Switch Operation

An o erride switch mounted on the side is pro ided for testing and special operational requirements.

Placing the switch in the AUTOMATIC position will allow the sensor to operate normally, acti ating the

controlled equipment as needed. Placing the switch in MANUAL ON will close the load relay, acti ating the

controlled equipment. The “STANDBY/RESET” position prohibits triggering of the unit, clears any acti e

delay timer, and opens the load relay. In order to reduce excessi e runtime for the heater the “Manual

n” mode will remain in effect for up to 40 hours, then return to “Automatic” mode, even if the

switch is still in the “Manual n” position. However, any trigger of the system will restart the 40

hour “Manual n” timer. You may put the DS-824C 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 N for less than 2 seconds, then switched back to AUT MATIC the controller

will execute one Delay- ff cycle. This can be used to clear a frost, hail, or drifted snow buildup without

the danger of lea ing the system in a continuous “Manual On” condition. “Standby/Reset” can still be used

to clear this Delay-Off cycle.

Typical Load Wiring

The Yellow load leads are N. . contacts and do not supply power directly to your load

The relay inside the DS-824C acts as a switch. While not as con enient as directly supplying power for the

load this allows you to operate the DS-824C from one oltage while controlling a load of a different oltage

without adding an external relay or contactor. For example, the DS-824C can be powered from 24VAC but

can directly control a 12VDC signal for a contactor coil or pro ide a dry contact thermostat-style closure for

a boiler. The following diagrams show some possible wiring schemes for connecting the DS-824C.

BROWN

BLUE

YELLOW

LOAD

SWITCHED 24V

RETURN

DS−824C

POWER INF

24 VAC/VDC SUPPLY

24VAC/VDC Sensor Supply, Supply Voltage ut