5.3. Connecting 1 outdoor unit to 2 indoor units
The diagram below shows how to connect one outdoor unit to two indoor units. Refer to the IUC
manual for the required IUC DIP switch settings.
Operation of the two indoor units is always identical, they cannot be controlled individually.
6. Capacity control
OSA units incorporate an inverter compressor that provides variable capacity. The following
paragraphs provide details on the available capacity control options.
Capacity at start-up
During the first 2 minutes after starting the capacity is fixed to 33% of unit rated capacity. After this
initial period normal capacity control commences.
Capacity control options
The following options are available for control of unit capacity:
• 0-10V analogue voltage on input VC.
• Automatic with a SAT-3 or a TZT-100 room thermostat.
• Modbus RTU serial communications.
• Automatic based on supply air temperature.
6.1. 0-10V control
Capacity can be controlled with a 0-10V analogue control voltage from an external control device. The
unit must not connect to a SAT-3 nor to a TZT-100 room thermostat, must not be controlled with
Modbus RTU serial communications, and must not be configured for automatic control of the
evaporating / condensing temperatures.
Note: Switching off and on of the compressor is not controlled by the capacity signal.
6.2. Supply air temperature control
For information how to enable supply air temperature control refer to chapter 10.4.
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