King Electric DS-2B - Manual (Page 3)

NEUTRAL BUS BAR
15A
LINE/L1
NEU/L2
YELLOW
YELLOW
LOAD
DS−2B
LOAD CENTER
30A
120VAC In, 240VAC Load, Separate Feed (Strap DS-2B for 120VAC Power)
15A
LINE/L1
NEU/L2
YELLOW
YELLOW
LOAD
DS−2B
LOAD CENTER
240VAC In, Dry Contact for Boiler/Circulation Pump (Strap DS-2B for 240VAC Power)
These are just some of the possible wiring schemes that can be used to connect the DS-2B to your load for
control. The DS-2B should always be strapped for the voltage that is connected to Line/L1 and Neu/L2.
Remember, these are only suggestions. You should always check with a qualified electrician to
insure conformance with local electrical codes!
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Voltage Selection, Power & Load Connection
The DS-2B requires a 100-120VAC or 200-
240VAC power source. Typically the DS-
2B is provided without the voltage selection
jumpers installed. Determine the sensor
supply voltage and install the voltage select
jumpers as shown. Power consumption for
the DS-2B is a maximum of 15 Watts, 50-60
Hz. The controlled load is switched by the
load relay through the “Load” connection
points. The load relay is rated for 30
Amps\240 VAC. Note that it is a normally
open “dry contact” closure. Some wiring suggestions are provided under “Typical Load Wiring” in this manual. However,
always consult local electrical codes for the wire color and size required for both power and load connections.
100-120VAC
200-240VAC
Applying Power with Incorrect Jumper Settings May Damage the Unit
Mettre Sous Tension avec les Arrangements Incorrects de Shunt Peut Endommager l'Unité
Setting the Configuration Switches
The following table outlines the operating modes for the DS-2B and explains the functions
of the adjustments. Trigger temp (TT) is adjustable from 34
°F-44°F (1°C-7°C) using the
“Temp Adjust” control. When ambient air temperature (AT) is below this trigger point
precipitation is assumed to be snow. When above this temperature, precipitation is
assumed to be rain. The SNOW switch will cause the sensor to activate when snow is
detected. The RAIN switch will cause the sensor to activate when rain is detected. If RAIN
and SNOW are both set “OFF” the unit will operate as a low temperature thermostat.
The DEL configuration switch activates the “Delay Off” drying cycle timer on
the DS-2B. The timer allows the DS-2B 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-2B will continue to operate as
long as precipitation is detected, then for the Delay Off period once precip
has stopped. All "sensor" modes (DEL off) provide a minimum 2 minute closure to reduce cycling of an external
controller. When in "controller" mode (DEL on) the Delay Off time can be adjusted from 30-90 minutes using the “Delay
Adjust” 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. Only use the “Manual On” function for testing. Never leave the Delay Adjust
control near the “Manual On” area during normal operation.
The Low Temperature Cutoff (LTC) option is typically used on snow melting systems
with limited output capacity. If selected, the sensor will not trigger if precipitation is
initially detected when the outdoor temperature is below 15
°F (-9.5°C.) However, if the
deicing system has been activated, precipitation continues, and the ambient
temperature drops below 15
°F (-9.5°C), LTC will be ignored. This assures that water
on the surface from melting snow will not immediately refreeze into ice as a result of
deactivating the deicing system. Reference the following table for suggested
configuration switch settings.
Power Must Be Cycled For Configuration Switch Changes to Take Effect
La Puissance Doit Être Faite Un Cycle Si le Commutateur Est Changé
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