Thermo Products USDT 2004B User Manual
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After-running time AT – During the start phase, the pump may repeatedly switch on and off for a
long time, especially systems with long solar loop. The after-run time AT can be changed from 0
(factory setting) to 9 minutes.
larm functions - User can enable the alarm function of the USDT 2004 in the ALARM
screen. Status of sensors and circulation pump can be viewed if alarm function is active.
A ON
Alarm function enable
A OFF
Alarm function disable
The status of the system can be monitored in the Stat Mode only if the corresponding feature is
active. The following example shows a system condition with a circulation problem:
CET OFF
Collector excess temp. cut-off active (no error occurred)
CET ON
No overheating
1 SHORT
Short circuit in sensor 1 wiring
2 SHORT
Short circuit in sensor 2 wiring
1 OPEN
Disconnection in sensor 1 wiring
2 OPEN
Disconnection in sensor 2 wiring
OK
System operates normal
NO CIRC
r T is more than 108
o
F in last 30 minutes
OK CIRC
Pump is running
CLEAR
Clears NO CIRC display after correction
A