8
Miniaturized terminal blocks are used for making wiring connections. The wire is
held in place within the terminal with screw that provides excellent contact
without damage to the wire.
Sensor Cable Connection:
Use up to an 18 AWG stranded wire to connect the
sensor cables to the unit. The S1 terminal should be connected to the collector
sensor (higher temperature); the S2 terminal is designated for the tank sensor
(lower temperature). And the S3 terminal is reserved for the advanced usage of
the unit such as third temperature sensor (in program mode 1), flow meter, low
insolation start, or second tank temperature monitoring in other programming
modes.
ower Connections:
A small blade screwdriver may be used to fasten
miniaturized terminal block screws while the corresponding wire is
inserted.
NOTE 1:
Always disconnect the controller from power supply before
opening the housing.
NOTE 2:
The controller should be properly grounded.
Flexible wires, 18/3 AWG
(gauge/conductor) simplify connection to the terminals.
The power terminal
block will accommodate wi re sizes to 14 AWG. All other connections should be
secured and adequately tightened, as loose power connections will over-heat,
and may cause fire.
NOTE 3: It is important that the specified output loads (245 Watts) are not
exceeded. Where these loads expect to exceed, external relays must be used. It
is good practice to install a 3 amps in-line fuse to protect controller and pump.
Always keep power cables away from sensor cables and other low voltage signal
cables.
NOTE 4: To protect against lightning damage, the system must be grounded
according local regulation. Sensor failures due to the weather or electrostatic are
mostly due to poor grounding.
NOTE 5: If step-down transformer is not mounted on the circuit board, the unit
should be powered by a 24 VDC. A step-down transformer can be used also
instead of DC power source; however, the open circuit voltage of the AC source
must be below 24 VAC.
P
