Install Instructions

ManualsBrandsAzel Technologies ManualsAzel ThermostatsSingle Stage Temperature Setpoint Control w/ Sensor Probe & Mounting DIN Rail

70 mm

45 SET

SET

DOWNDEFROST

Led 1Led 2

Azel Technologies Inc. reserves the right to make changes without further notice to any

products herein to improve reliability, function or design. Azel Technologies Inc. does not

assume any responsibility for any improper use or application of any product or circuit described

herein. Azel Technologies Inc. products are not designed, intended, or authorized to be use as

components in systems or applications intended to support or sustain life, or for any other

application in which the failure of the Azel Technologies Inc. product could create a situation

where personal injury or death may occur.

Rev.: 27-04-2018 Cod.: 00990259

DST-900/DST-902

DST-922

One or Two stage digital

setpoint controller

Installation and

operating instructions

7.00 ANOMALIES SIGNALING

MSG

CAUSE

OUTPUT

PF1

The probe input line is open

or short circuited.

The measured temperature is

out of range.

- output K1 will switch-off;

- output K2 does not

change.

1.00 GENERAL DESCRIPTION AND INSTALLATION NOTICE

The DST-900/DST-902/DST-922 models are suitable for a wide range of applications. The DST-900 is a One Stage Digital Setpoint Control to

drive a relay in order to reach a set point temperature value. The DST-902 is also a One Stage Setpoint Control but with two relay outputs. The

DST-922 is a Two Stage Digital Setpoint Control to drive two relayes according two different temperature values. The controllers are available

with off cycle defrost (compressor switching OFF, see “ddt” and “dpt” parameters). The access to the operating parameters can be prevented

by a combination of keys.

The controller must be installed in a place protected from extreme vibration, impact, water, corrosive gases, and where temperatures and

moisture do not exceed the maximum rating levels indicated in the specifications. The same directions are valid for the probe installation.

1.10 THE THERMOSTAT PROBE

The probe must be installed in a place protected from direct air flow particularly far from fans and doors, so a better average temperature of the

room will be measured. The probe is not waterproof, it should be placed with its head upward, so that drops would not penetrate into the bulb

and damage the sensor. Maintain the length of the electrical wires as short as possible in order to keep the noise picked by them at low level,

otherwise a shielded wire will be needed, where the shield will be connected to the ground.

1.20 ELECTRICAL WIRING

We recommend to protect the power supply of the controller from electrical noise, spikes, and especially from voltage surges and drops. This

can be easily done following these recommendations:

-separate the power supply of the loads (compressor, heaters, fans, etc) from the power supply of the controller. This can alleviate problems

related to voltage dips that can arise during the switch-on of the loads, that may interfere with the controller’s microprocessor causing

unexpected resets.

-the cables of the probes and the ones of the controller supply or the loads must be separated and not close, to reduce spikes and noise on the

sensor. This improves the stability of the reading and it also makes the commutation of the device more accurate.

1.30 CRITICAL ENVIRONMENT

For applications in heavy industrial environment these rules should be followed.

- After having identified the source of noise spikes, it is recommended to apply a line filter to the source in question of the type specifically

designed to solve EMC (Electromagnetic compatibility) related problems. Sometimes it may be sufficient an RC type filter, also called

«snubber» , connected in parallel to the external relay coils, or circuit breakers.

- An independent power supply should be used to power the device in extreme conditions.

1.40 MOUNTING

The controller is a DIN rail mounting instrument which can be mounted onto the wall or panels. For easily mounting, remove the DIN rail by

sliding it out first. Use screws to mount the DIN rail onto the wall/panel. Then snap on the control to the DIN rail by pulling black trigger on the

bottom with a screw driver.

Up: 1) To increase the value of the selected parameter; 2) To

scroll the parameters in SET mode; 3) During defrost action, to

update the probe 1 temperature.

Down: 1) To decrease the value of the selected parameter; 2)

To scroll the parameters in SET mode.

Set: To access the parameter menu to view and change the

values. It is also the “Enter” key to confirm the new values.

Defrost: Used to start/stop a manual defrost.

FRONTAL PANEL LAYOUT AND FUNCTIONS

PUMP

(LOAD)

16(8)A 250Vac

DST-900

115VAC

L(black)

(White)N

115VAC

8(3)A 250Vac

16(8)A 250Vac

K1K2

DST-902

DST-922

PUMP

(LOAD)

L(black)

(White)N

ON BOILER

Azel Technologies Inc.

PO BOX 53138

10 Royal Orchard Blvd.

THORNHILL, ONTARIO

CANADA L3T 7R9

Ph: 905-223-5567

Fax: 905-223-3778

web: www.azeltec.com

e-mail: info@azeltec.com

8.00 SPECIFICATIONS

DISPLAY: 3 digit, 13.2 mm, high intensity green;

INPUTS: one PTC or NTC sensor;

MEASURING RANGE: -55 … +302 °F for PTC probe;

(-48... +150 °C)

-39 … +248 °F for NTC probe;

(-40… +120 °C)

ACCURACY AT 77°F (25°C):

With Res=0 (resolution 0.1C), the accuracy is +/- 1.1 °C

With Res=1 (resolution 1C), the accuracy is +/- 2 °C

With Res=0 (resolution 0.1F), the accuracy is +/- 1.1 °F

With Res=1 (resolution 1F), the accuracy is +/- 2 °F

RESOLUTION: 0.2 or 2 °F (0.1 or 1°C)

OUTPUTS: 1 spdt 250Vac 16A max resistive (1hp),

+ 1 spdt 250Vac 8A max resistive (0.5hp) only for DST-9x2;

POWER SUPPLY: 115 Vac ±10% 50/60Hz;

POWER CONSUMPTION: 0.03A

ENVIRONMENTAL CONDITIONS:

- operating temperature: 23… 122 °F (–5 … +50 °C);

- storage temperature: -4... 158 °F (–20 … +70 °C);

- relative humidity: 30 … 90 % non condensing;

- no shocks or vibrations;

MECHANICAL DATA:

- plastic housing self extinguishing type UL94V0;

- connections through terminal block for 2.5mm

gauge wire;

- protection degree: IP64 for the frontal panel (enclosure IP31).

6.00 PARAMETER LIST

MEANING

SETTING

FACTORY

SETTING

SEt

Main Set Point

Range between «LoS» & «HiS»

75 °F

HYS

Thermostat main

differential (Hysteresis 1)

Range 0 .. 17.9 °F (0 .. 10 °C)

1 °F

HY2

Thermostat secondary

differential (Hysteresis 2)

only DST-922

Range 0 .. 17.9 °F (0 .. 10 °C)

1 °F

LoS

Minimum value for SET

POINT parameter

Range –55 .. +211 °F (-50 .. 100 °C)

-39 °F

HiS

Maximum value for SET

POINT parameter

Range -21 .. +308 °F (-30 .. 154 °C)

238 °F

Act

Action main output

0: cold; 1: heat

Ac2

Action secondary output

only DST-922

0: cold; 1: heat

OFS

Offset, temperature

calibration for probe

Range –8.4 .. +7.6 °F (-9.9 .. 9.9 °C)

AcY

Anticycling time main

output

Range 0 .. 254 (see tis)

dl2

Anticycling time secondary

output

only DST-922

Range 0 .. 254 (see tis)

0 sec

dPt

Defrost pause time

Range 1 .. 254 (see tis)

ddt

Defrost duration time

Range 0 .. 99 (see tis)

0 (disabled)

unt

Temperature displayed unit

0: Celsius;

1: Fahrenheit

rES

Resolution

0: decimal point resolution;

1: unit resolution

utd

Display update time delay

Range 0 .. 60 sec

1 sec

tiS

Defrost time scale

0: ddt minutes, dpt hours, acy/dl2 seconds;

1: ddt seconds, dpt minutes, acy/dl2 seconds;

2: ddt minutes, dpt hours, acy/dl2 minutes;

3: ddt seconds, dpt minutes, acy/dl2 minutes

St2

Secondary set point

only DST922

Range between «LoS» & «HiS»

75 °F

Sensor Probe Type

0: NTC (10Kohm thermistor; range –39..+248°F)

(-40… +120 °C)

1: PTC (1Kohm thermistor; range –55..+302°F)

(-48... +150 °C)

Typical terminal connections (See the label close to the terminals

for the right power supply diagram connection).