Manual Operation Mode
This mode allows the user to manually turn the pump on or off.
AUTO The above display indicates that the unit is working in automatic mode. The pump starts at a temperature difference of 15 oF and runs as long as ? T is above 7 oF. The B symbol appears in upper display line next to the collector symbol while the pump is running. User can switch to manual mode by pressing
òkey. By pressing ð key while centerline blinks, a hand symbol G in lower line shows manual operation. Pressing ð one more time lets you turn the pump ON or OFF. By pressing ñ key you change the pump operation.
S
S1
S2
ensor Designation – The
Sensor 1 (collector outlet)
Sensor 2 (collector inlet or bottom of the tank)
Sensor wires can receive electromagnetic pulses, which can result in a wrong temperature reading. The USDT 2004B reads sensor values every 50 ms. It can bundle several readings and process their average.
The impedance characteristics of the USDT 2004B sensors (temperature dependencies) are represented in the following table:
T | 0 | 10 | 20 | 25 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100°C |
R(KTY) | 1630 | 1772 | 1922 | 2000 | 2080 | 2245 | 2417 | 2597 | 2785 | 2980 | 3182 | 3392 Ω |
9