King Electric DS-8 - Manual (Page 2)

C&M JACK
SWITCH JACK
PROBE JACK DELAY ADJUST
TEMP ADJUST SENSOR TERMINAL BLOCK
LED JACK
INPUT POWER
VOLTAGE SELECT
LOAD
Setting the Adjustments
The DS-8 is specifically designed for snow and freezing rain detection only. This section
explains the functions of the adjustments. Trigger temperature is adjustable from 34
°F
(1.1°C) - 44 °F (6.6°C) using the temperature adjust (TEMP) control. When ambient air
temperature is below this trigger point precipitation is assumed to be snow or freezing rain.
When above the trigger temperature, precipitation is assumed to be rain and the sensor
will not trigger.
"Delay Off" refers to the drying cycle timer of the DS-8. The timer allows
the DS-8 to 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
precipitation detection. Therefore, the DS-8 will continue to operate as
long as precipitation is detected, then for the Delay Off period once
precipitation has stopped. The Delay Off time can be adjusted from 30-90 minutes using the delay adjust (DEL)
control. Note the “Manual On” function at the low end of the Delay Adjust control. The relay will close when this
area is entered and open when exited.
2
Detecting Both Rain & Snow
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-2B or any controlled
equipment.
Pour éviter la décharge électrique déconnectez toute la puissance avant d'ouvrir la couverture du DS-
2B.
3. To avoid fire hazard replace fuse F1 with a 1/2 Amp 250 VAC 2AG fast acting fuse ONLY.
Pour éviter le risque d'incendie remplacez le fusible F1 par un fusible de 1/2 l'ampère 250 VCA 2AG
SEULEMENT.
The DS-8 is designed primarily for snow detection but it is possible to trigger the unit on detection of
any precipitation. Unplugging the temperature probe from the probe jack will simulate continuous
freezing temperature detection. Any precipitation, rain or snow, which lands on the moisture sensor
will trigger the unit, no matter what the ambient temperature may be. Note, however, that the unit
cannot be configured for detection of rain only. Consider the DS-2B or DS-824 for this application.
Moisture Grid Maintenance & Replacement
It is recommended that the DS-8 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-
Brite
TM 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 a new MG-3 “Moisture Grid Assembly”. Reference
the “Moisture Sensor Mounting & Termination” section for information on replacing the moisture
grid.
Preseason Testing
It is always a good idea to test the operation of the DS-8 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-8 and confirm that the lamp shows a steady
indication. Drip some of the water onto the moisture grid, and then spray the temperature sensor
protruding from the base of the DS-8 enclosure with the component cooler. Once the temperature
sensor has reached the trigger point with water still present on the grid the DS-8 will activate. The
user should hear the internal control relay close and the indicator will begin flashing. Proper
operation has now been confirmed. To clear the Delay-Off timer place the override switch into
“Standby/Reset”, and then back to “Automatic.”
Need Indoor Monitoring & Control?
Take a Look at the ASE CDP-2
Simple Installation & Operation at a Competitive Price
Visit www.goase.com for more information
7