120Vac, 208-240Vac or 12/24Vac/dc, 50/60Hz  ( specify model ) 2 to 22F ( 1 to 12C ) 2 to 12F ( 1 to 7C ) 0 to 255F (-17 to 140C) standard or depending upon temp. probe ordered (-50C to +250C temperature ranges AVAILABLE upon request ) +/- 1F (0.5C) Celsius or Fahrenheit (selectable) LOAD ON when Temperature Difference Higher than "ON" diff.  preset LOAD OFF when Temperature Difference Lower than "OFF" diff.  preset ( Other operating modes upon request ) 2 x 3 digits, 7 segment, Super Bright LED RED ( 0.36"  LED display digits ) + POWER ON and LOAD ON indication Current Temperature on both probes and ON Diff. and OFF Diff.  indication SPST relay, 30 Amp, 250Vac (or custom) SPST relay, 30 Amp, 250Vac (or custom) OPTIONAL, SPST relay, 10 Amp, 250Vac (or custom) OPTIONAL, SPST relay, 10 Amp, 250Vac (or custom) OPTIONAL, piezo, 85dB internal 2 PROBES up to 500 feet  ( 150m ) away from controller  ( any type wire ) Standard +210F (+99C ) high temp. limit ( other limits optional ) Automatic with error display and protection

APPLICATIONS: SOLAR HEATING control SOLAR COOLING control VENTILATION control HUMIDITY control Air Conditioning HEATERS and CHILLERS Other media Temperature Heat /Cool process control

Specifications: Supply: "ON" Differential range: "OFF" Differential range: Temp. control range: Temp. Accuracy/units: Control mode: Display: Display Data: Load output 1: Load output 2: Load output 3: Load output 4: Alarm buzzer: Probe wiring: High Temp. protection: Error detection:

series   DSD-2RT  Digital  DIFFERENTIAL  THERMOSTAT with 2 external temperature sensors. Output load up to 60 Amp / 250Vac with 2 or 3 relays on-board with 2 ROTARY controls : 1.  POWER ON/OFF and "OFF" Differential Preset 2.  "ON" Differential Preset

Click here to download: WIRING EXAMPLES DSD-2 SPECIFICATIONS USER INSTRUCTIONS

DIMENSIONS: Face:  Stainless Steel with Lexan decal. Body: ( W x H x D ) 5-3/8" x 2.75" x 2" 136mm x 70mm x 51mm

DESCRIPTION: Electronic, digital differential temperature controller designed for Heating, Cooling, A/C, Ventilation, Humidity Control. The "ON" and "OFF" Temperature  Difference  can be preset by rotating the knobs on the face. The thermostat will control the output high power relays ( 1, 2, 3 or 4 relays on board ) that can be wired to a heater, fan, pump  or another load. The output relays contacts are isolated for wiring to any low or high voltage source. The two digital displays show both probes temperature readings as well as the "ON" and "OFF" Differential presets. Models available for 120Vac, 208-240Vac, 12V or 24V AC/DC, 50/60Hz. Other Features: The probes may be wired up to 500 ft. ( 150 meters ) away from the controller. The differential presets may be adjusted at any time. Models with High and/or Low temperature limit are available. The temperature probes can be wired far away from the controller with an ordinary 2-conductor cable Quiet, switching of high power loads. Celsius or Fahrenheit  temperature units selectable.

INSTALLATION in Box or Wall ( Panel  ): Designed to fit in a 3-Gang electrical box or in a panel. Face plate will sit flush with the wall.

Model:   DSD-2RT-2HP-120-56-FN0P224-HL210F-DON22F-DOF12F-1NA7100KB4100BLK

Differential Thermostat with rotary controls and 2 external probes included. Operating range: 0 to 224F (-17 to +107C ). High Temp. Limit = 210 F( 99C ). "ON" Diff. preset range = 2-22 F (1-12C ). "OFF" Diff. preset range = 2-12 F( 1-7C ). 2 High Power relays (30 Amp/240V  max each).

SELECTION of standard Temperature Probes :

TYPICAL WIRING EXAMPLES  ( click on images for more )

KERA Technologies Inc.    Toll Free:  1-866-829-4253         Tel: 905-629-9420   Fax: 905-629-9475                    EMAIL:

NA7100KB4100BLK NA7100KB4100CHR NA7100KB4100RDT NA7100KB4100SQT NA7100KB4100DPD NA7100KB4100SHD PT1000TC38550MM NA7100KB4100PIPTR

OPTIONAL Plastic or Metal (SS) Sensor Probe Plate (model PPP4 or PPS4 ).

OPTIONAL: Sensor Probe Guard model PG5 (black or grey ) .

Click here for complete LIST OF OPTIONS

COMPLETE NUMBERING SYSTEM FOR SD series CONTROLLERS : ( click below to download PDF document )

Toll Free:  1- 866- 829- 4253

For 2 AC / DC Motors, Pumps, Fans or other loads up to 2 x 30 Amp max.

With contactor for Very High load Power

Simple wiring for loads up to 30 Amp max.

Model:  DSD-2RT-2HP-120-56-DON24F-HLF95-HF2-FN16P208-1NA7100KB4100BLK

Application Examples

For Heating, Attic / Roof Ventilation and Humidity Control:

For Heating, Ventilation and Humidity Control in Switchgear :

Differential Thermostat with rotary controls and 2 external probes included. Operating range: -16 to +208F (-26 to +98C ). High Temp. Cut-Off Limit = 95 F( 35C ). "ON" Diff. preset range = 2-24 F (1-13C ). "OFF" Hysteresis  = 2 F( 1C ). 2 High Power relays (30 Amp/240V  max each).

Differential Thermostat with rotary controls and 2 external probes included.  Operating range: -16 to +208F (-26 to +98C ). High Temp. Limit = 208 F( 98C ). Adjustable Low Temp. Cut-Off Limit  60 to 80 F( 16 to 27C ). "ON" Diff. preset range = 1-20 F (0.5-11C ). "OFF" Hysteresis  = 1 F( 0.5C ). 2 High Power relays (30 Amp/240V max  each).

Model:  DSD-2RT-2HP-120-56-DON20F-LLIMP60P80-HF1-FN16P208-1NA7100KB4100BLK

For Cooling and Ventilation with adjustable Low Limit :

For Solar Heating Control with selectable Low Temp Limit, High Temp Limit, Overheat Protection and Freeze Protection :

Model:  DSD-2RT-2HP-1MP-120-56-DONP2P22F-DOFP1P12F-FRA-LL-HL-FN16P208-1NA7100KB4100BLK

Differential Thermostat with rotary controls and 2 external probes included. Operating range: -16 to +208F (-26 to +98C ). "ON" Diff. preset range = 2-22 F (1-11C ). "OFF" Diff. preset range = 1-12 F (0.5-7C ). Selectable Low Temp. Cut-Off Limit at  +70 F ( +21C ). Selectable Freeze Protection Auto Circulation ON at +40 F ( +4C ). Selectable High Temp. Protection at 190 F( 87C ). Activates 3-rd  relay. 2 High Power relays (30 Amp/240V  max each),  SPST. For Circulating Pumps. 1 Medium Power relay (10 Amp/240V max),  SPDT. For Overheat.

NOTE:   CUSTOM  MODIFICATIONS  AVAILABLE  FOR  ALL  MODELS

For Heating and Air Conditioning :

Model:  DSD-2RT-2HP-120-56-DONN4P12F-DOFN4P12F-FN16P208-1NA7100KB4100BLK

Differential Thermostat with rotary controls and 2 external probes included. Operating range: -16 to +208F (-26 to +98C ). High Temp. Limit = 208 F( 98C ). Cooling:  "ON" Diff. preset range =  -4 to +20 F (-2 to +11C ). Heating:  "ON" Diff. preset range =  -4 to +20 F (-2 to +11C ). 2 High Power relays (30 Amp/240V max  each). One for Heat and One for A/C.

Thermowell model:  BTW-100-05-075NPT Brass, Stem = 4" , Bore = 0.2", 3/4 NPT thread

Thermowell model:  BTW-25-05-075NPT Brass, Stem = 1" , Bore = 0.2", 3/4 NPT thread

Thermowell model:  BTW-25-05-025NPT Brass, Stem = 1" , Bore = 0.2", 1/4 NPT thread

Solar Heating,  Attic / Roof Ventilation,  Switchgear Humidity prevention

- Hight Temp. Limit - Low Temp. Limit - ON and OFF Differential Preset - Freeze Protection - Overheat Protection - Alarm Buzzer

OPTIONS:

House Attic / Roof ventilation

Fan

Inside Sensor

Outside Sensor

Switchgear humidity control or ventilation

Inside Sensor

Outside Sensor

Heater or Fan

Thermowell model: SSTW-114-066-050NPT

Stainless Steel Stem = 1-5/8" Bore = 0.26" 1/2 NPT thread

Stainless Steel Stem = 4-1/2" Bore = 0.26" 1/2 NPT thread

Thermowell model: SSTW-41-066-050NPT

Thermowell model: SSTW-64-066-050NPT

Stainless Steel Stem = 2-1/2" Bore = 0.26" 1/2 NPT thread

Thermowell model: SSTW-114-066-050NPT

Stainless Steel Stem = 4-1/2" Bore = 0.26" 3/4 NPT thread

Heat Exchanger

Solar Collector

Water Tank

DSD Controller

Pump

Pump

Drainback Reservoir

Hot Water Out

Cold Water In

Glycol

Water

Coax Cross Adapter

Optional Overheat Valve

FOR MORE SOLAR HEATING EXAMPLES CLICK HERE

Simple split drainback system with external heat exchanger and one standard tank.

Split pressurized system with a storage tank with internal heat exchanger and a service tank with electric booster.

Simple split pressurized system with one tank with internal heat exchanger.

Split pressurized system with external heat exchanger and one tank with electric booster.

Split pressurized system with a storage tank with internal heat exchanger and a service tank with gas booster.

Hot Water Out

Hot Water Out

Hot Water Out

Hot Water Out

Cold Water In

Cold Water In

Cold Water In

Cold Water In

Compensation Tank

Compensation Tank

Compensation Tank

Compensation Tank

Solar Collector

Solar Collector

Solar Collector

Solar Collector

Optional

DSD Controller

DSD Controller

DSD Controller

DSD Controller

Heat Exchanger

Coax Cross Adapter

Water Tank

Water Tank

Storage Tank

Electric Service Tank

Storage Tank

Gas Service Tank

Optional Overheat Valve

Water

Water

Water

Glycol

Glycol

Glycol

Glycol

Electric Booster

Gas Booster

Optional Overheat Valve

Pump

Pump

Pump

Pump

Pump

WT-805 Tank Controller

WT-805 Tank Controller

WT-805 Tank Controller

Electric Booster

Optional Overheat Valve

P/T Valves

P/T Valve

P/T Valve

P/T Valve

P/T Valves

P/T Valve

P/T Valve

P/T Valve

P/T Valve

Solar Panel Temp. Probe

Solar Panel Temp. Probe

Solar Panel Temp. Probe

Solar Panel Temp. Probe

Solar Panel Temp. Probe

Tank Temp. Probe

Tank Temp. Probe

Tank Temp. Probe

Tank Temp. Probe

Tank Temp. Probe

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