Thermo Products USDT2004 - Manual (Page 8)

8
RUV X.X – This display shows the software revision number.
NR O – This is PROGRAM 0 which indicates simple operation of unit as a Universal Solar
Differential Temperature (USDT) controller. Change this value to 1 (NR 1) for activation of the
third sensor or pulse flow meter input (PROGRAM 1).
Hysteresis Bandwidth
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)
Delta T Adjustment
diff =1 Pump runs when temperature difference between collector T1 (collector) and T2
(tank) exceeds this value. Factory setting is 15
o
F. 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
o
F. Consult your collector
manufacturer for the recommended value.
Manual Operation Mode
AUTO The above display indicates that the unit is working in automatic mode. The
pump starts at a temperature difference of 15
o
F and runs as long as ? T is
above 7
o
F. The B symbol appears in upper display line next to the collector