Digitally Communicating Thermostat - TemperZone UNIT CONTROLLER 7 Operation & Installation

Temperzone UC7 Operation & Installation, Air-to-Air Units, Issue 9

3.7. Digitally communicating thermostat

Use shielded twisted pair suitable for RS485 to connect a digitally communicating thermostat. The
UC7 supports the Temperzone TZT-100 thermostat. Other thermostats can be added on request.
Connect the twisted pair wires to terminals "B2" (-) and "A2" (+).
The UC7 provides 12V DC power on terminal "12" that may be used to power the thermostat.
Terminal "G" is ground return for the 12V DC power. For this application it is recommended to use a
shielded cable with twisted pairs. The correct connections are shown here:
The TZT-100 thermostat can also be powered by an isolated 24V AC power source as shown below:
In this case the 24V AC supply common should NOT be earthed elsewhere in the system, otherwise
differences in earth potentials can lead to unreliable communications between the thermostat and
the UC7.
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If the distance between
the thermostat and the
UC7 is greater than 10m
and the UC7 is located at
one end of the cable then
place jumper "J2" on the
centre and left pins
Otherwise place jumper
"J2" on the centre and
right pins.