A
ZEL
TECHNOLOGIES
SETPOINT TEMPERATURE CONTROLS
DST-777S, DST-777D
INSTALLATION AND OPERATING INSTRUCTIONS
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Fast sampling rate (1 sec.) Of the sensor temperature for
instant control action
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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 electromechanical controls
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Sensor failure and out of range indication
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Backlit option: Auto (30 sec.)/OFF/ON
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Lockout mode to prevent tempering by unauthorized
personnel
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Remote temperature sensor which can be extended to 500 ft.
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Power surge protection
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LED indicates output relay status
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Selectable Heat or Cool modes
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Easy-Connect Screwless Terminals for sensor connection
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Easy installation and setup
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Advanced PWM (Pulse Width Modulation) Control to achieve
high control accuracy on single stage models
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Simple and user-friendly programming of setpoint
temperature, differential and cooling/heating modes
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Selectable Fahrenheit or Celsius scales
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Maximum and minimum memory for sensor temperature
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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)
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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
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Easy-to-Read Dual Digital Display with backlit which provides
constant readout of sensor temperature and setpoint
simultaneously, functional status and control settings. It also
allows precise setpoint and differential settings
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EEPROM memory retains control settings in the event of a
power failure
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Choice of one or two stage models
FEATURES
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Reliable Digital Electronic Accuracy
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QuickSet
feature allows instant setpoint adjustment without
entering programming mode
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 setpoint
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.
APPLICATION
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
outputs) for residential/commercial heating, cooling, air conditioning
and refrigeration applications.
Mount the DST-777 controller to a suitable surface. Slotted keyholes and
standard holes are provided for mounting purposes.
MOUNTING
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Can be strapped on a pipe or inserted into a temperature well
DST-777S Single Stage Setpoint Temperature Control
Models:
DST-777D Single Stage Setpoint Temperature Control with 2 outputs
SPECIFICATIONS
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Temperature Display Resolution: 0.1°F/0.1°C
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Differential Adjustment: 1 to 100°F(1 to 38°C)
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Anti-Short Cycle Delay: 0 to 20 min. (1-Minute increments)
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Operating Voltage: 120VAC, 50/60Hz
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Relay: 1 or 2 x SPDT, 120VAC, Full Load 12A, 1Hp
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Accuracy: ±1°C / ±1°F
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Temperature sampling rate: 1 second
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PWM Differential: 3 to 50°F (2 to 25°C)
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Enclosure: Flame Retardant Plastic 94V0
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Weight: 3.0 lbs
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Dimension:
6 3/8”(W) x 6 5/8”(H) x 2 3/4”(D)
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Sheath: Copper
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Lead: 10” of 20 AWG heat resistence wire
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Setpoint Temperature Range: -40 to 240°F(-40 to 116°C)
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Dimension: 3/8" OD x 13/16" length
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°
°
Operating range: -60 to 255 F (-50 to 125 C)
P-01 Sensor Probe:
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PWM Cycle Length: 30 to 1500 sec. (10-Second
Increments)
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Input: 10K ohm thermistor probe(included): P-01 (designed
for strap on a pipe or insert into a temperature well)
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°
°
Sensor: 10K ohm @ 77 F (25 C ± 1%) thermistor
1. To prevent electrical shock hazard, disconnect power supply before
installing.
3. Azel Technologies is not responsible for damages resulting from misuse
of its products.
Never connect the load terminals to a load that takes more current than
the amount listed for the relay in the electrical ratings.
18 gauge or larger wire is recommended for sensor connections.
CAUTION!
2. All wiring must comply with national and local electrical codes,
ordinances, and regulations.
4. 12-18 gauge wire is recommended for 120 VAC conections;
5. This literature is provided for informational purposes only.
Senors should be strapped to the pipe with cable tie. The flat side of the
sensor should be resting on the pipe. In addition, they should be covered with
a layer of insulation to minimize the effects of ambient temperature for a more
reliable temperature reading.
The sensor P-01 can be extended up to 500 with conventional 18 gauge
wire(or larger to keep additional resistance to a minimum). It is designed to
strap on a pipe or insert onto a temperature immersion well.
The sensor P-01 can also be insert onto a 3/8”(10mm) or ½”(12.7mm)
ID temperature well.
Note: Do not run sensor wires parallel to other electrical wiring or telephone
wires. In case there is strong source of electromagnetic interference,
twisted pair 20AWG wire is recommended.
MOUNTING THE SENSOR:
