7.2. Dry mode and the TZT-100 thermostat
To configure the TZT-100 thermostat for dry mode:
• Press-and-hold the O/RIDE button for 15 seconds until the PIN code is shown (88:15).
• Use the Up/Down buttons to select the correct PIN code (default is 88:21), then press O/RIDE
again. The thermostat is now in installer mode.
• Press O/RIDE a number of times until the screen shows Fn.
• Press the Up/Down buttons to select the correct option. The options are:
o -- manually select heating / cooling
o H heating only
o C cooling only
o A heating / cooling / auto
o d- manually select heating / cooling / cooling with dry mode
o dC cooling / cooling with dry mode
o dA heating only / cooling only / cooling with dry mode / auto with dry mode
• After selecting the desired option press MODE to exit from installer mode.
To operate a unit in dry mode: Select cool + dry or auto cool / heat + dry, start the unit in cooling
mode. Select fan setting “Low-Med-High”.
8. Indoor fan control
Temperzone OSA units normally connect to a matching indoor unit, models ISD. For convenience any
of the following inputs can be used to control the fan in the indoor unit:
• IUC inputs Hi-Me-Lo (inputs for voltage-free contacts, note 1)
• UC8 inputs HI-ME-LO (24V AC or 12V to 24V DC signals, note 1)
• UC8 input VF (0-10V, note 1)
• SAT-3 or TZT-100 room thermostat (note 2)
• Modbus RTU serial communications using RS485 wiring (note 3)
Notes:
1. If the unit is not controlled by Modbus RTU serial communications or SAT-3 or TZT-100 then
the UC8 automatically selects the input that requests the highest indoor fan speed.
2. If control is by SAT-3 or TZT-100 thermostat then signals on IUC inputs Hi-Me-Lo and on UC8
inputs HI-ME-LO and VF have no effect.
3. If control by serial communications is used then all other control options are disabled. For
more information refer to document “Temperzone UC8 Modbus communications”.
Some installations do not permit indoor fan speed to vary from the requested speed at any time.
For such installations the indoor fan can be controlled directly by an external controller or the fan may
be hardwired to run at a constant fixed speed.
If the UC8 is not used to control the indoor fan then it is the responsibility of the system- designer
and -installer to ensure proper and safe operation of the indoor fan, and the system as a whole,
under all operating conditions.
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