DST SERIES (DST-777S, DST-777D, DST-7772) DIGITAL SETPOINT TEMPERATURE CONTROLS

DST-777 series controls are microprocessor-based electronic one or two stage setpoint temperature controls, designed to provide one or two on/off controls (Single-Pole Double-Throw(SPDT) relay output) for residential/commercial heating, cooling, air conditioning and refrigeration applications.
The DST-777 is equipped with a Dual Digital display with backlit that provides a constant readout of the sensor temperature and setpoint simultaneously as well as the other programmed settings. The front buttons allow the user to easily and accurately select the set point temperature, differential and heating/cooling mode of the operation. Unique QuickSet feature allows instant setpoint adjustment without entering programming mode. This reliable and versatile control has a very wide setpoint range, an adjustable differential and time delay that makes it applicable in many different applications. The single stage models have Pulse Width Modulation (PWM) control logic to prevent overshoots and undershoots in slow responding systems with large thermal mass such as pools or slabs. A sensor probe P-01 is supplied with the control. This solid state temperature sensor probe can be extended up to 500 feet.

APPLICATIONS:

The DST series can be used for a wide variety of applications:

• Slab thermostat for radiant floor heating

• Tank Heating

• Boiler control (used as a thermostat)

• Space and return air temperature control

• Condenser fan cycling

• Milk coolers

• Cooling tower pump control

• Refrigerated warehouses

• Chillers

• Beer and beverage coolers

• Refrigerated display cases

• Walk-in and reach-in refrigerators

• Other applications: research, science, laboratory, education, aquarium, hydroponics, pools and more

Pulse Width Modulation (PWM)

The single stage models (DST-777S, DST-777D) offer optimum control by means of a Pulse Width Modulation. The ON and OFF cycle vary depending on the difference between the sensor and setpoint temperature. The bigger difference between the sensor and setpoint temperature, the longer the relay is switched ON. When the sensor temperature approaches the setpoint temperature, the ON time become shorter and shorter. Pulse Width Modulation guarantees precise control response. This function prevents overshoots and undershoots in systems with large thermal mass (eg. slabs or pools).

     DST-777 SINGLE STAGE AND TWO STAGES DIGITAL SETPOINT TEMPERATURE CONTROL     

 

Please click to view PDF Brochure        DST-777S/DST-777D PDF Installation Instructions                  DST-7772 PDF Installation Instructions

 

FEATURES:

• Reliable Digital Electronic Accuracy

• QuickSet feature allows instant setpoint adjustment without entering programming mode

• Easy-to-Read Dual Digital Display with backlit which displays sensor temperature and setpoint simultaneously, functional status and control settings. It also allows precise setpoint and differential settings

• Simple and user-friendly programming of setpoint temperature, differential and cooling/heating modes

• EEPROM memory retains control settings in the event of a power failure

• Wide adjustable setpoint with temperature range from -40 to 240°F and differential from 1 to 100°F. This enables the user to optimize the system performance for any applications. A tighter differential can be achieved (eg. 1°F or 1°C) than conventional electro mechanical controls

• Advanced PWM (Pulse Width Modulation) Control to achieve high control accuracy on single stage models

• Fast sampling rate (once/second) of the sensor temperature for instant control action

• Choice of one or two stage models

• One or two SPDT relay outputs. Model: DST-7772(two stage) can handle one or two sensor inputs with two setpoints. When using two sensor inputs, each setpoint can be corresponding to one relay output. (Two units in one control)

• LED indicates output relay status

• Adjustable Anti-Short Cycle Delay to ensure the output relay remains off for up to 20 minutes. This would avoid unnecessary hard start and equipment wear

• Selectable Fahrenheit or Celsius scales

• Selectable Heat or Cool modes

• Maximum and minimum memory for sensor temperature

• Lockout switch to prevent tempering by unauthorized personnel

• Remote temperature sensor which can be extended to 500 ft.

• Sensor failure and out of range indication

• Easy installation and setup

• Easy-Connect Screwless Terminals for sensor connection

• Backlit option: Auto (30 sec.)/OFF/ON

• Power surge protection

SPECIFICATIONS:

• Setpoint Temperature Range: -40 to 240°F(-40 to 116°C)

• Temperature Display Resolution: 0.1°F/0.1°C

• Differential Adjustment: 1 to 100°F(1 to 38°C)

• Anti-Short Cycle Delay: 0 to 20 min. (1-Minute increments)

• PWM Cycle Length: 30 to 1500 sec. (10-Second Increments)

• PWM Differential: 3 to 50°F (2 to 25°C)

• Accuracy: ±1°C / ±1°F

• Input: 10K ohm thermistor probe(included): P-01 (designed for strap on a pipe or insert into a temperature well)

• Operating Voltage: 120 or 240 VAC, 50/60Hz

• Temperature sampling rate: once/sec.

• Relay: 1 or 2 x SPDT, 120VAC, Full Load 10A, 1Hp

• Enclosure: Flame Retardant Plastic 94V0

• Weight: 3.0 lbs

• Dimension: 6 3/8”(W) x 6 5/8”(H) x 2 3/4”(D)

     UNIVERSAL DIGITAL SETPOINT TEMPERATURE CONTROLS DST-900 - ONE STAGE  * DST-922 - TWO STAGE   

Please click to view PDF Brochure

DST series was conceived on purpose to be installed on switchboards, panel boards, heating/cooling units and other applications.

FEATURES:

• Reliable Digital Electronic Accuracy

• Easy-to-Read Digital Display which displays sensor temperature and functional status. It also allows precise setpoint and differential settings

• Simple programming of setpoint temperature, differential and cooling/heating modes. Setpoint can be adjusted easily wihout going into programming mode.

• Wide adjustable setpoint with temperature range from -39 to 248°F ( -39 to 120°C) and differential from 0 to 18°F (0 to 10°C). This enables the user to optimize the system performance for any applications. A tighter differential can be achieved (eg. 1F or 1C) than conventional electromechanical controls

• Anti-Short Cycle Delay to ensure the output relay remains off for up to 254 secs. This would avoid unnecessary hard start and equipment wear

• Cooling applications include automatic defrost timing as well as manual defrost

• User selectable Celsius or Fahrenheit scales

• Adjustable temperature offset to compensate any deviation from the real temperature value

• Selectable decimal point or unit resolution

• Lockout switch to prevent tempering by unauthorized personnel

• A universal 10K ohm sensor P-01 is supplied with the control. This solid state temperature sensor probe can be extended up to 500 feet.

• Easy installation

SPECIFICATIONS:

• Setpoint range:-39 to 248°F ( -39 to 120°C)

• Differential: 0 to 18°F(0 to 10°C)

• Anit Cycling Delay: 0 to 254 sec.

• Output: 1 SPDT 250VAC 16A max resistive (1HP), + 1 SPDT 250VAC 8A max resistive (0.5HP) only for DST-922

• Resolution: 0.1°C (0.2°F) or 1°C (1 or 2°F)

• Accuracy: ± 1°F

• Display: High intensity Green LED, 3 digits, 13.2 mm

• Data storing: on EEP-ROM not volatile memory

• Operating temperature: 23 to 122 °F (-5 to +50 °C)

• Sensor Probe: Model: P-01, 10K ohm NTC (included)

• Relative humidity: 30 to 90 % (not condensing)

• Power supply: 115VAC ± 10%, 50/60Hz

DST-900PR/DST902PR/DST-922PR (DIN Rail models)

• Housing: self-extinguish UL94V0 ABS plastics, white colour

• Size: frontal 45 x 71 mm; depth 58 mm (4 DIN modules)

• Mounting: DIN rail for panel boards

DST-900E/DST902E/DST-922E (Aluminium Enclosure models)

• Housing: premium quality aluminium enclosure with blue powder coat cover

• Size: 8" x 4" x 2"

• Included dual row terminal block for universal wiring needs

 

     i-Link SERIES ZONE CONTROLS ( SWITCHING RELAYS ) FOR HYDRONIC HEATING ( RADIANT FLOOR HEATING ) SYSTEMS   

A NEW ERA IN ZONE CONTROLS...

The i-Link series multi-zone circulator switching relays simplify wiring for hydronic heating ( radiant floor heating ) systems. With leading edge features and superior product design, i-Link makes installation quick and easy.

Available in one to six zone models. The i-Link series are designed with flexibility and multi-zone applications in mind. It is so flexible that different models can be interconnected for unlimited zone expansion. In addition, i-Link provides far more functional status than other models on the market today because of their front panel LED indicators that provide the easy system diagnostics demanded by today’s installers. Each unit is designed with a unique power surge protection to ensure continuous control operation and avoid damage and trouble to replace the unit.

Selectable Priority with Protection Timer

Priority Protection timer available in two to six zone models prevents freeze-ups in the event of a priority zone failure. SP-84, SP-85, SP-86 are equipped with field selectable priority by-pass function to ensure continuous operation of secondary zones which allow maximum flexibility for system applications.

From design to manufacture, each i-Link unit is built on the foundations of quality and reliability. Azel products are quality controlled in order to achieve “total customer satisfaction” - a foundation that you can rely on.

GENERAL FEATURES:

• Front panel indicator lights

• Fuse protection

• Power surge protection

• Easy-Connect Terminals/Screwless Terminals for Thermostat Connections

• Compact and modern design

• Safety design with all electronic components hiding behind the enclosure

• Simplified wiring

• Universal Design: Cold Start or Tankless Coil Boiler

• Contractor friendly PCB layout

• High Capacity Transformer

• 24VAC transformer output with common terminal provides compatibility with electronic thermostat

• Universal thermostat compatibility

• 100% Factory Tested

• Extended 3 year warranty

ADDITIONAL FEATURES(SP-82 TO SP-86):

• Unlimited zone expansion

• Priority timer for protection of a priority zone malfunction and prevention of freeze-ups in the heating zones

• Field selectable priority

• Capable of turning on extra system circulator

• SP-84/85/86: Manual priority override(bypass) for each of the secondary zone

• Isolated End Switch

              SPECIFICATIONS:                                                                                                      

Model:	SP-81	1 Zone Switching Relay
	SP-82	2 Zone Switching Relay
	SP-83	3 Zone Switching Relay
	SP-84	4 Zone Switching Relay
	SP-85	5 Zone Switching Relay
	SP-86	6 Zone Switching Relay
Power Supply:		120 VAC, 50/60Hz
Dimensions:		6 3/8”(W) x 6 5/8”(H) x 2 3/4”(D)
Electrical Switch Rating:		10 A 1/3 HP @ 120VAC
Thermostat Anticipator Setting:		0.18 A
Enclosure:		Flame Retardant Plastic 94V0
Shipping Weight:		SP-81/82/83 3 lbs; SP-84/85/86 4 lbs.

                                                                                                                                                        

     i-Link SERIES ZONE VALVE CONTROLS  FOR HYDRONIC HEATING ( RADIANT FLOOR HEATING ) SYSTEMS   

The i-Link series Zone Valve Controls simplify the field wiring and yet control up to six zone valves in a multi-zone hydronic heating system. The contractor friendly Printed Circuit Board eliminates the problem caused by incorrect wiring and saves hours of installation time. There would be no more “messy” look of conventional zone valve installations.

Intelligent Linking System (i-Link) allows unlimited zone expansion with additional i-Link controllers. Field selectable priority with Priority Protection Timer ensures other zones get heat every one hour and prevents freeze-ups in the event of a priority zone failure. The End Switch delay timer let the two wire type zone valves fully opened before turning on the circulator. The panel provides EZ screwless terminal blocks for connections to the thermostats and zone valves. In addition, LED indicators on the front panel provide functional status and easy troubleshooting.
 

GENERAL FEATURES:

• Front panel indicator lights

• Field selectable Priority

• Priority timer for protection of a priority zone malfunction and prevention of freeze-ups in the heating zones

• Unlimited zone expansion

• Dual Isolated End Switches for SZ-84/86DX

• Three-minute End Switch delay timer for two wire type zone valve applications. Circulator will start only after the zone valve is fully opened.

• DIP switch for easy setup of two wire type zone valve applications. No need to hook up wire jumper on the third and fourth terminals on each zone

• Works with two, three or four wire type zone valves and thermostats

• Compact and modern design

• Safety design with all electronic components hiding behind the enclosure for SZ-84/86DX

• Fuse protection

• Simplified wiring

• Contractor friendly PCB layout

• Easy-Connect Screwless Terminals

• 24VAC transformer output with common terminal provides compatibility with electronic thermostats

• Universal thermostat compatibility

• 100% Factory Tested

• Extended three year warranty
  
  ADDITIONAL FEATURES FOR SZ-V4/SZ-V6
  

• Isolated End Switch

• Pre-wired terminals for circulator

• SPDT Priority zone relay switch (N/O Com N/C). Capable of prioritizing DHW pump in a 2-pump system

• 50VA replaceable transformer
  
   

             SPECIFICATIONS:                                                                                                      

Model:	SZ-84DX	4 Zone Valve Control
	SZ-86DX	6 Zone Valve Control
Power Supply:		24 VAC, 50/60Hz
Dimensions:		6 3/8”(W) x 6 5/8”(H) x 2 3/4”(D)
Electrical Switch Rating:		10 A 1/3 HP @ 120VAC
Thermostat Anticipator Setting:		0.18 A
Enclosure:		Flame Retardant Plastic 94V0
Shipping Weight:		3 lbs

 

Model:	SZ-V4	4 Zone Valve Control with transformer
	SZ-V6	6 Zone Valve Control with transformer
Power Supply:		120 VAC, 50/60Hz
Dimensions:		11”(W) x 6 5/8”(H) x 3”(D)
Electrical Switch Rating:		10 A 1/3 HP @ 120VAC
Thermostat Anticipator Setting:		0.18 A
Enclosure:		Aluminum
Shipping Weight:		5 lbs