Differential Temperature Controller DTLED-2 with auxiliary output for pump with PWM

Description

This unit DTLED2 can be used to control the operation of circulation pump of a solar system based on temperature difference between solar (boiler, stove, etc.) and water tank. Also can control supplementary heating of water tank up to a preset temperature.

Features:

• Frost and overheat protection of solar and tank.

• Separate outputs for circulation pump and supplementary heater of up to 5A.

• Monitors two temperatures.

• Fast and easy programmable - 4 main settings and one user defined parameter.

• Modes of operation - „Auto” /”Holiday” easily selectable by a slide switch at front panel.

• „Eco function” – postponе 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.

• 2 pcs. PTC temperature probe – silicon cable 0.3M –PTC 1k

• 2 separate  Relay outputs for:

• LED display with 2 digits and 6 additional LEDs for indication.

• Buttons – 1pcs.

• Easy setup – each main setting can be selected among a set of fixed values.

• 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

• Setting of dT (differential temperature – solar to tank) by a knob – fine : from 3 to 25°C

• Setting of tank temperature (supplementary heating) – using push button on front panel: starting +25°C up to maximal temperature allowed in 5°C step;

• Manual test/activation of pump – holding the push button on front panel.
• PWM output for speed regulation of appropriate pumps

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)

• Supplementary 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 temperature.
9,10 - PWM output


Technical sheet DTLED2