120Vac, 208-250Vac or 12/24Vac/dc, 50/60Hz  ( specify voltage when ordering ) 1F to 99F ( 1C to 55C ) Other ranges upon request. 0F to 98F ( 0C to 54C ) Other ranges upon request. -40F to +255F (-40C to +124C) standard or depending upon the temp. probe ordered (other  temperature ranges AVAILABLE upon request ) +/- 1F (0.5C) Celsius or Fahrenheit (selectable) Typical control example: For Heating: LOAD ON when Temperature Difference Lower than "MIN" diff.  preset         LOAD OFF when Temperature Difference higher than "MAX" diff.  preset For Cooling:  LOAD ON when Temperature Difference Higher than "MAX" diff.  preset         LOAD OFF when Temperature Difference Lower than "MIN" diff.  preset ( Other operating modes upon request ) 2 x 3 digits, 7 segment, Super Bright LED ( 0.56"  LED display digits in various colors ) + POWER ON and LOAD ON indication Current Temperature on both probes and ON Diff. and OFF Diff.  indication, diagnostics and relays status 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 External PROBES up to 500 feet ( 150m ) away from controller  ( any type wire ) User programmable high and low temp. limits Automatic with error display message 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: "MAX" Differential range: "MIN" Differential range: Temp. control range: Temp. Accuracy/units: Selectable control modes: Display: Display Data: Load output 1: Load output 2: Load output 3: Load output 4: Alarm buzzer: Temp. sensor wiring: High / Low Temp. protection: Error detection:

series   DSD-4PB  Digital  DIFFERENTIAL  THERMOSTAT With 2 or 3 external temperature sensors. With USER PROGRAMMABLE sequence of operation Output load up to 60 Amp / 250Vac with 2, 3 or 4 relays on-board with 8 push-button controls : 1.  Thermostat ON/OFF 2.  "STEP" for fast acess to Differential Presets 3.  "MENU" to scroll through and modify all settings 4.  AUX 1, 2 and 3 for optional manual control of the relays

Click here to download: WIRING EXAMPLES USER INSTRUCTIONS

DIMENSIONS: Face:  Metal plate 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 Solar Heating, Cooling, A/C, Ventilation, Humidity Control etc... The  "MIN" and "MAX" Temperature  Difference, and limits can be programmed by the user via the push-buttons 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, A/C or other load. The output relays contacts are isolated for wiring to any low or high voltage loads.. The two digital displays show both probes temperature readings as well as the Differential presets, limits and relays status. Features: Standard operating range from -40F ( -40C ) to +255F (+124C )  . Other ranges available upon request. The Min. and Max. differential presets may be adjusted at any time within 0 to 99F ( 0 to 55C ) range. High and Low temperature limits are fully user adjustable. Overheat and Freeze protection temperature limits are fully user adjustable and may activate additional relays. The temperature probes may be wired up to 500 ft ( 150m )  away from the controller with any ordinary 2-conductor cable. Quiet, switching of high power loads. Models available for 120Vac, 208-250Vac, 12V or 24V AC/DC, 50/60Hz.

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.

SELECTION of standard Temperature Probes :

TYPICAL WIRING EXAMPLES  ( click on images for more )

KERA Technologies Inc.    Toll Free:  1-866-829-4253

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 the complete OPERATING SEQUENCE TABLE

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.

Application Examples

For Heating or Cooling, Attic / Roof Ventilation and Humidity Control (with programmable High and Low temp Limits )

For Heating, Ventilation and Humidity Control in Switchgear (with programmable High and Low temp Limits )

For Cooling or Ventilation (with programmable High and Low temp Limits )

Application examples for Solar Heating Control with programmable settings and sequence for: Low Temperature Limit High Temperature Limit Overheat Protection Low Temperature Protection Freeze Protection High and / or Low Temperature or Freeze protection relays

NOTE:   CUSTOM  MODIFICATIONS  AVAILABLE  FOR  ALL  MODELS

For Heating and Air Conditioning (with programmable High and Low temp Limits )

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 - Maximum Differential Preset - Minimum Differential Preset - Freeze Protection - Overheat Protection - Alarm Buzzers and relays

Programmabble parameters:

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-114-066-075NPT

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

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

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

For 2 AC / DC Motors, Pumps, Fans or other loads up to 2 x 30 Amp max. and 1 additional Relay ( up to 10 Amp ) for Overheat or Freeze protection

TEMPERATURE PROBE WIRING EXTENDABLE UP TO 500 FEET ( 150m ).

CUSTOM TEMPERATURE RANGES PER REQUEST

E-mail:  info@keracontrols.com

E-mail:  info@keracontrols.com

NOTE: Our DSD-4 Differential Thermostat model numbers are fully descriptive You DO NOT HAVE TO know the complete model number to order. Please call our customer service and we will assign a correct model number for your application. A short description of your application will be very helpful. NOTE 1: In the description of differential thermostats the designation "IN" and "OUT" is only symbolic,  and it does not necessarily mean that the "IN"  probe has to be "Inside" and the "OUT" probe " Outside". The sensor probes can be swapped by placing them in opposite locations in order to satisfy the correct control operation. However, remember that the temperature of the probe that is connected to the "IN" terminals wil be indicated on the "IN" section of the display and the probe connected to the "OUT" terminals wil be indicated on the "OUT" section of the display, and the controller operation will behave accordingly.  NOTE 2: In many cases the DSD-4 thermostats may be ordered with special, customized options that may be more suitable to your application.

THE DSD-4 DIFFERENTIAL THERMOSTAT HAS UP TO 32 USER PROGRAMMABLE MODES OF OPERATION. FULLY PROGRAMMABLE TEMPERATURE RANGES AND LIMITS. USER SELECTABLE CELSIUS OR FAHRENHEIT UNITS. HIGHLY VISIBLE LED DISPLAY FOR TEMPERATURE INDICATIONS, SETTINGS AND RELAYS STATUS. OPTION FOR MANUAL OVERRIDE OF ON-BOARD RELAYS. MEMORY OF SETTINGS INDEPENDENT OF THE SUPPLY POWER. AUTOMATIC RESTART AFTER POWER INTERRUPTION.