AZEL SOLAR DIFFERENTIAL CONTROL: DST-932 - Manual

70 mm
90
45 SET
33
UP
SET
DOWN MODE
Led 1 Led 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.: 11-10-2005 Cod.: 00990270
DST-932
Differential Temperature Control
for
Solar Heating System
Installation and
operating instructions
6.00 PARAMETER LIST
# MEANING SETTING
FACTORY
SETTING
dt Delta T Set Point Range (dtd) 0.8 .. 50.1 °F 15 °F
dtd Delta T hysteresis Range 0.8 .. 17.9 (dt) °F 2 °F
OFS
Offset 1, temperature calibration for
probe on the storage tank
Range –8.4 .. +7.6 °F 0 °F
OF2
Offset 2, temperature calibration for
probe on the collector
Range –8.4 .. +7.6 °F 0 °F
AcY Anticycling time relay Range 0 .. 254 seconds 3 s
AF Anti Freeze protection
Range 0.3 .. 50.0 °F;
OFF: the protection is disabled.
oFF
OP Over Temperature protection
Range 32.1 .. 228 °F;
OFF: the protection is disabled.
159 °F
Opd Over Temperature hysteresis Range 0.8 .. 17.9 °F 5 °F
AdF Anti Freeze hysteresis Range 0.8 .. 17.9 °F 5 °F
unt Temperature displayed unit
0: Celsius;
1: Fahrenheit
1
rES Resolution
0: decimal point resolution;
1: unit resolution
1
utd Display update time delay Range 0 .. 60 sec 1 sec
Pt Sensor Probe Type
0: NTC (10Kohm thermistor;
range –40..+248°F)
1: PTC (1Kohm thermistor;
range –58..+302°F)
0
7.00 ANOMALIES SIGNALING - ONLY IN AUTOMATIC MODE -
MSG CAUSE OUTPUT
HIt
The temperature of probe 1 (storage water
tank) is higher than the OP value (over-
temperature) .
- output K1 will switch-off.
PF1
The probe input line 1 is open or short circuited.
The storage tank measured temperature is out
of range.
- output K1 will switch-off.
PF2
The probe input line 2 is open or short circuited.
The collector measured temperature is out of
range.
- output K1 will switch-off.
8.00 SPECIFICATIONS
DISPLAY: 3 digit, 13.2 mm, high intensity green;
INPUTS: two NTC sensors or two PTC sensors;
MEASURING RANGE: -55 … +302 °F for PTC probe;
-39 … +248 °F for NTC probe;
ACCURACY AT 25°C: ±1 °F + 1 digit;
RESOLUTION: 0.2 or 2 °F;
OUTPUTS: 1 spdt 250Vac 16A max resistive (1hp);
POWER SUPPLY: 115 Vac ±10% 50/60Hz;
ENVIRONMENTAL CONDITIONS:
- operating temperature: –5 … +50 °C;
- storage temperature: –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
2 gauge wire;
- protection degree: IP64 for the frontal panel (enclosure IP31).
1.00 GENERAL DESCRIPTION AND INSTALLATION NOTICE
The DST-932 model is conceived to control the Solar Heating Systems. The DST-932 drives a pump in order to warm up the water into a
storage tank (by the sun energy). The controller reads the temperatures of the storage tank (T1) and of the collector (T2), when this differential
temperature (T2-T1) is higher than a set value (dt) it will switch on the water pump. It is possible limit the maximum temperature of the storage
tank and also activate a freeze protection function. By switching to manual mode it allows the test of the heating system.
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 PROBEs
The probes must be installed in a place to measure the correct average temperature of the system. 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. If moisture goes into the probe bulb, it false the reading temperature and the control action.
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 (boilers, 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) To show the collector
temperature (probe 2).
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.
Mode: Used to switch the automatic/manual mode.
FRONTAL PANEL LAYOUT AND FUNCTIONS
Typical terminal connections (See the label close to the terminals
for the right power supply diagram connection).
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: [email protected]
AC
Line
115V
16(8)A 250Vac
K1
DST-932
115VAC
N
L
WATER
PUMP