10.5. Thermostat auto-on/off options: o
The UC8 can be configured to automatically switch the SAT-3 or TZT-100 thermostat on and off
synchronous with the remote on/off input terminal of the UC8 circuit board. Available selections are:
• 0: Thermostat automatic on/off is disabled (default).
• 1: Thermostat automatic on/off is enabled.
• 2: Thermostat automatic on/off is enabled, the unit automatically starts in cooling mode every
time the UC8 remote on/off signal changes from off to on.
Option 0 (default):
The auto-on/off feature is disabled. This means that a SAT-3 or TZT-100 thermostat that is
switched on can show that a unit is active (cooling, heating or fan-only) even when the unit is
actually off because the UC8 remote on/off terminal is made inactive (open-circuit).
Option 1
note 1
:
The thermostat shows the actual state of the unit. In this case when a thermostat is on and the
UC8 remote on/off signal becomes inactive (open circuit) the thermostat is automatically switched
off. While the UC8 remote on/off signal remains inactive the thermostat is held off, pressing the
thermostat on/off button is overruled by the UC8 off-command. When the UC8 remote on/off
signal becomes active again then the thermostat resumes operation with the same settings that
were valid when last active.
Option 2:
This mode is intended for use only on cooling-only installations; it is unsuitable for installations
that also require operation in heating mode. The thermostat is forced to remain off when the UC8
remote-on/off input is inactive. When the UC8 remote on/off signal becomes active the
thermostat is automatically switched on in cooling mode.
Note 1: If power is removed from the unit while the unit is switched off by the remote on/off signal,
then the thermostat will power up in the OFF-state. The unit will NOT resume operation in the last
active mode! If it is essential that the unit must always come back on after a power-cut then the unit
must be configured for option 0 (feature disabled) or option 2 (cooling starts automatically).
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