Thermo Technologies USDT 3000 - Manual (Page 5)

4
Wire Connection:
A small blade screwdriver may be used to fasten miniaturized terminal block
screws while the corresponding wire is inserted.
Caution: Controller wiring should only be done when the unit is not energized. It is possible to
damage the control unit if it is assembled under voltage. Miniaturized terminal blocks are used for
making wiring connections. The wire is held in place within the terminal with a screw that provides
excellent contact without damage to the wire.
Use up to an 18 AWG stranded wire to connect the sensor cables to the unit.
•
S1 collector sensor (higher temperature) 1 & 2
•
S2 return sensor (lower temperature) 3 & 4
•
S3 tank sensor (additional measure point) 5 & 6
•
Ground terminals 12, 13, 14
•
Relay R2, auxiliary relay for heat extraction
R2 live line (Black)
16
N neutral conductor (White) 15
Ground clamp (Green) 14
•
Relay R1, solar loop pump
R1 live line (Black)
18
N neutral conductor (White) 17
Ground clamp (Green) 13
•
Power Supply, 120 V AC
L live line (Black)
20
N neutral conductor (White) 19
Ground clamp (Green) 12