Thermo Products USDT 2004B manual Tank Overheating Protection, Diff?1

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Par Using the navigation key ^_ allows you to select the desired parameter while you are in the program mode. Press the selection key ò once to select the parameter in the window. Selected parameter blinks allowing you to modify it. You can modify the selected parameter while the middle window blinks by pressing the ï or ð key. The unit accepts the new value by pressing the ñ key once.

RUV 2.0 – This display shows the software revision number.

NR O – This indicates the USDT 2004B employment as a basic solar hot water heating controller.

PROGRAMMING THE TEMPERATURE RANGE

USDT 2004B is factory set at T2 > 160 oF PUMP OFF, T2 < 150 oF PUMP ON. The user may program a different temperature range (hysteresis bandwidth) if required. In this case, there are two temperatures that should be entered:

Tank Overheating Protection

User can program hysteresis (temperature range for output control) by using max? and max=.

For

 

max?1

Pump stops above tank temperature (T2)

max=1

Pump runs again below this set point (T2)

Temperature Differential Adjustment

diff=1

Pump runs when temperature difference between collector T1 (collector) and T2

 

(tank) exceeds this value. Factory setting is 15 oF. Consult your collector

 

manufacturer for the recommended value.

diff?1

Pump stops when temperature difference between collector T1 (collector) and T2

 

(tank) reaches this value. Factory setting is 7 oF. Consult your collector

 

manufacturer for the recommended value.

 

 

 

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Contents Usdt 2004B Installation and User’s Guide Introduction Control unit has the following basic functionsInstallation Following safety precautions is strongly recommendedPage Page Basic Operation of Digital Display Page Tank Overheating Protection Diff?1Rkty Overheating protection Malfunction, but realistic temperature valuesIncorrect display of temperatures