----------- PROXEL ENGINEERING -------------------- www.proxel-bg.com------------------------------ DTLED rev. 1.6/06.2015------
1
DIFFERENTIAL TEMPERATURE CONTROLLER FOR SOLAR SYSTEM
WITH CIRCULATION
AND TANK HEATER THERMOSTAT
Model DTLED
USER MANUAL
Description
The unit DTLED can be used to control the operation of
cirlucation pump of a solar system based on temperature
difference between solar (boiler,stove,etc) and water tank.
Also it can control supplementary heating of water tank up to
a preset temperature.
Features:
1. Frost and overheat protection of solar and tank.
2. Separate outputs for circulation pump and supplementary
heater of up to 5A.
3. Monitors two temperatures.
4. Fast and easy programmable - 4 main settings and one user defined parameter.
5. Modes of operation - „Auto” /”Holliday” easily selectable by a slide switch at front panel.
6. „Eco function” – postponds the heater activation if solar is active (if “there is sun” the
supplementary heater is switched off) – this mode can activated/deactivated by by user
at any time.
7. 2 pcs. PTC temperature
probes
– silicon cable 0.3m –PTC 1k
8. 2 separate Relay outputs for:
-
Р1 – SPDT (N.O. +N.C.) contact. Outputs “live” for pump or valve (on and off) controll
-
Р2 – SPST (N.O) contact for activation of suplimentary heater
9. LED display with 2 digits and 6 additional LEDs for indication.
10. Buttons – 1pcs.
11. Easy setup – each main setting can be selected among a set of fixed values.
12. Main parameters setting – selectable by changing jumper location:
-
maximal temperature in tank: +65; +75; +85 °C
-
frost protection of solar (forced activation of pump): -25; -10; +5 °C
-
minimal temperature of solar to enable circulation based on dT: +40; +50 °C
13. Setting of dT (differential temperature – solar to tank) by a knob – fine : from 3 to 25°C
14. Setting of tank temperature (supplementary heating) – using push button on front
panel: st25°C up to maximal temperature allowed in 5°C step;
15. Manual test/activation of pump – holding the push button on front panel.
ЕСELECTRICAL WIRING
-
Power supply 220V AC – internal and pump – term. 21 (Live in “L”) / 18 („N”-neutral)
-
Pump output (N.O) – term. 19 (Live output) / 17 („N”-Neutral)
-
Supplimentary heater (N.O.)– temr. 16 and 15 -5A max
* Additional external fuse should be connected to term.21 of up to 6A.
- Sensors
TS1 – term.5,6 – tank temperature
TS2 – term 7,8 – solar tempetature.
----------- PROXEL ENGINEERING -------------------- www.proxel-bg.com------------------------------ DTLED rev. 1.6/06.2015------
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OPPERATION
Front pannel:
- “1” – LED indicator of tempetature (2 digits). Mostlly displays tank t° and each 10 sec. displays
solar t° for 2 sec. (if tank t° is displayed LED#6 is ON, if solar t° is displayed LED#9 is ON).
- “2” – slide switch for mode selection („Auto” / „HOLLIDAY”)
- “3” – push button
- LED “4” – if “On”, the displayed value is over 100°C. (if display=’25’ and LED#4 is ON means
t° =123°C)
- LED “5” – if “On”, negative displayed value (if display=’10’ and LED#5 is ON - t° = -10°C)
- LED “6” – if “On” displayed value is for tank tank temperature. If blinks – possible probe failure
- LED “7” – if “On” – pump is active
- LED “8” – if “On” – heater is active
- LED “9” – if “On” – displayed value is for solar temperature. If blinks – possible probe failure.
- If LED 9 and LED 8 blinks alternatively – dT value is displayed
Button operation:
1.
When pressed shortly, the following information is displayed sequentially:
-
boiler and solar temperatures - automatically alternating each 3 sec.
-
differential temperature (dT) setting. The temperature is alternated with the symbols "dt";
-
maximal allowed temperature in the tank. The temperature alternates with the symbols
"bH";
-
Minimal temperature of solar to enable circulation. The temperature alternates with the
symbols "cS" (Collector Start);
-
Temperature setting for anti freezing protection. The temperature is alternated with the
symbols "cd" (Collector Defrost);
2.
When pressed and holded for 3-4 seconds displays/changes the temperature of the tank’s
thermostat. The temperature alternates with "bt" / "bE" (Standard / Eco tank thermostat);
-
Each subsequent pressing increases the set temperature by 5 degrees. If the set
maximum temperature in the tank is exceeded, the value returns to 15 ° C.
-
Switching between standard and Eco tank thermostat is cyclical, each time when the
maximal tank temperature is exceeded. The symbols changes "bt" to "bE" and the mode is
changed also.
3.
When pressed and holded for more than 10 seconds, the pump is manually activated – as
long the button is pressed;
*
To return to the basic mode leave the device without pressing the button for 1 minute.
Choosing an operation mode
-
for normal operation "Auto mode" - move the slider to the "left" to position “Auto”
-
to operate in holyday mode “vacation” mode - move the slider to the "right"
Faulty sensor alarm
- the corresponding indicator "6" or "9" blinks rapidly.
To change most settings, you need to remove the product’s cover
