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8/2/2019 Ds 224 Controller Datasheet
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The DS-224 is an advanced low voltage version of the
DS-2B. It is primarily designed for hydronic pavement
snow melng applicaons and baery/solar powered
railroad de-ice and lubricaon control. The 24VAC/VDC
supply means less expensive wiring, no requirement for
conduit, and lower installaon costs.
The unit is housed in a two gang PVC enclosure. The
overall dimensions of the DS-224 are 4(120) x 7(178)
x 2(70). The unit weighs 2 pounds. The user may
access all electronics by removing the four front cover
screws.
The DS-224 can be powered from a 22-28VAC/VDC
source. Peak power consumpon is 15 VA at startup,
8.5 VA steady state triggered, 5 VA steady state untrig-
gered. Power input is polarity protected for a DC supply.
The unit provides a single 24VAC/30A or 24VDC/20Anormally open load contact set. This contact set is paral-
leled with a low power contact set to provide remote
control and acvaon monitoring. Operaonal tempera-
ture range is -40C to +85C.
The table on the next page outlines the operang
modes for the DS-224. Trigger Temperature (TT) is
adjustable from 34F-44F using an on-board control.
When ambient air temperature (AT) is below this trigger
point precipitaon is assumed to be snow or freezing
rain. When above the trigger point, precipitaon is as-
sumed to be rain.
Delay O refers to the internal drying cycle mer of
the DS-224. The mer is used to allow the DS-224 to dry
the heated surface through evaporaon once precipita-
on has stopped. The drying cycle reduces the chance
that moisture le behind by the melng process will
refreeze into ice. This mer is restarted by each precipi-
taon detecon. Therefore, the DS-224 will connue to
operate as long as precipitaon and trigger temperature
is detected, then for the Delay O me once rain or
snow stops. It is assumed that, when operang as asensor, the DS-224 is supplying an acvaon signal to an
external control system. All sensor modes provide a
minimum 2 minute closure, reducing cycling of the ex-
ternal controller. The Delay O cycle has been extended
for hydronic applicaons and is determined by the Long
CONTROLS & MONITORING
THE DS224 RAIN/SNOWSENSOR CONTROLLER
Designed for Low Voltage Hydronic
and Baery Powered Systems
Automac Acvaon means Lower De-icing Costs
Reliable Rain and Snow Detecon
24VAC/VDC Operaon, Only 20 VA Required
Full 30A @ 24VAC Control
Replaceable Precipitaon Sensor
8 Dierent Funcons, 1 Part Number
Adjustable Temperature Trigger Point
Exclusive Adjustable Sensivity Control
Selectable Low Temperature Cuto
Smart Manual On Operates for One Delay O Cycle
High Power, Low Price!
(866) 635-8123
www.thermaltechusa.com
8/2/2019 Ds 224 Controller Datasheet
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Delay (LD) switch seng, DEL switch seng and the DEL
adjustment. Delay O is 30-90 minutes in non-LD con-
troller mode and 2-6 hours in LD controller mode.
An environmentally sealed control switch is provided.
The Manual On funcon acvates the controlled
equipment for tesng and special operaonal condi-ons. The Automac posion allows the DS-224 to
handle all detecons and control. The Standby/Reset
posion disables triggering and can also be used to
clear the delay o mer (see below) from true or test
acvaon. If the switch is placed in Manual On for less
than 2 seconds, then switched back to Automac the
controller will execute one delay o cycle. This allows a
controlled manual acvaon of the snow melt system
without the fear of forgeng and leaving the system
in Manual On for an extended and potenally very
expensive period of me. Standby/Reset can sll beused to clear this delay o cycle. Remote control and
monitor up to 1000 feet away is also available when the
oponal CS-1 C/M cable listed is installed. The DS-224
is also compable with the DP-7B, DP-7EX, and CDP-2
remote control/status panels.
The Low Temperature Cuto (LTC) opon is typically
used on de-icing or snow melng systems with limited
output capacity. If selected, the sensor will not trigger if
precipitaon is detected below 15F. However, if the de-
icing system has been acvated, precipitaon connues,
and the ambient temperature drops below 15F, LTC will
be ignored. This assures
that water le behind on
the surface during the
heang cycle will not im-
mediately refreeze into ice
as a result of deacvang
the de-icing system.
The DS-224 also features a
new innovaon, a Trigger
Sensivity Adjustment.
Previous units have always
detected and triggered on
the rst drop of rain, the
rst ake of snow. While
this has always provided a highly reliable detecon it
may create nuisance triggers in some installaons.
Snow blowing o a roof or falling from a tree couldcause the system to acvate for a delay cycle when its
not needed, increasing operang costs. The sensivity
adjustment allows seng the number of seconds the
precipitaon grid must see connuous rain or snow be-
fore the sensor is triggered and ranges from 3 seconds
to 4 minutes. A higher sensivity seng assures quick
detecon no maer the condions. A lower sensivity
seng will allow a few stray drips of rain or akes of
snow to be ignored but a heavier downfall will trigger
the system.
CONTROLS & MONITORING
FUNCTION
AMBIENT
TEMP AT
DELAY OFF
LD OFF
DELAY
OFF
LD ON SUGGESTED APPLICATION
Snow sensor w\o LTC AT < TT 2 Min 2 Min Snow and ice alert, Sensor for external deice/snow melt con-
troller (unlimited heat)
Snow sensor w\LTC TT>AT>15F 2 Min 2 Min Sensor for external deice/snow melt controller (limited heat)
Snow controller w\o
LTC
AT < TT 30-90 Min 2-6 Hrs Stand-alone controller for electric/hydronic snow melng
Snow controller w\LTC TT>AT>15F 30-90 Min 2-6 Hrs Stand-alone controller for electric/hydronic snow melng
Precipitaon sensor Not Used 2 Min 2 Min Snow, ice, and rain alert, Ku band rain and snow diversion
Precipitaon controller Not Used 30-90 Min 2-6 Hrs Snow, ice, and rain alert, Ku band rain and snow diversion
Rain sensor AT>TT 2 Min 2 Min Rain alert, Ku band rain diversion
Rain controller AT>TT 30-90 Min 2-6 Hrs Ku band rain diversion, intake and exhaust fan control
(866) 635-8123
www.thermaltechusa.com
8/2/2019 Ds 224 Controller Datasheet
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DS224 SPECIFICATIONSDimensions 4(120) x 7(178) x 2(70)Weight 2 Lbs. (0.9 Kg)
Operang Temperature -40F to +185F (-40C to +85C)
Enclosure Rang NEMA 3R
Supply Power 22-28VAC/VDC 15VA maximum, 5VA typical
Trigger Temperature 34F-44F (1.1C-6.6C) Field Selectable
Delay O (Sensor) 2 Minutes
Delay O (Controller) 30-90 Minutes/2-6 Hours Field Selectable
Load Contact Capacity 30A @ 24 VAC/100,000 operaons minimum at full load
Monitor Contact Capacity 24 VDC/VAC 400mA 10W total
CONTROLS & MONITORING
(866) 635-8123
www.thermaltechusa.com