Thermo Products USDT 2004B User Manual
Page 11
11
The factory setting will be retrieved by pressing and holding
ò key during powering of the unit. A
“WELOAD” displays for three seconds while factory settings are restored.
Mode
Operation
SENSOR
Selects sensor type
SGUARD
Protects system from overheating and frost
START
Starts pump at pre-set insolation (solar radiation intensity)
AT
After-running time. Factory-set at 0.
ALARM
Enables/Disables protection functions
BTU
Energy calculation and setting
ensor Designation – USDT 2004 accepts two different sensor types or a reference
value . User can program a constant reference temperature instead of a sensor output.
The factory-preset sensor is the thermistor (KTY 10) type. The KTY 10 tank sensor,
white wire, should be used in a conditioned environment and will not be permanently damaged up
to 360
o
F.
Selection:
S1
Sensor 1 (collector outlet) selection
S2
Sensor 2 (collector inlet) selection
S3
Sensor 3 (tank) selection
Designation:
PT
PT 1000 sensor (1000 O at 0
o
C, not available in US market)
KTY
Thermistor sensor (2000 O at 25
o
C)
GBS
Radiant sensor (not available in US market)
(-
Fixed value, the unit uses this value instead of measured temperature
S3(-S 1 Transfer of values (not used in program 0 operation)
DIG
Digital input (not used in program 0 operation)
OFF
The sensor reading is not displayed
VSG
Flow rate reading
Sensor wires can receive electromagnetic pulses, which can result in a wrong temperature
reading. The USDT 2004 reads sensor values every 50 ms. It can bundle several readings and
process their average.
AV 1 Sensor 1 average
AV 2
Sensor 2 average
AV 3 Sensor 3 average
The numbers of samples can be programmed from 4 to 20.
S