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Dry
The AC unit will be run as per Cool mode. However, the fan speed will be automatically changed to low speed to
maximise moisture removal to dry the supply air.
Auto
In Auto mode the Rinnai Home will automatically change modes between Cool and Heat to satisfy the sensor.
There is an Auto mode dead band which can be adjusted in the Rinnai Home AC>Config>AC Unit>Auto mode
dead band. It is recommended that this Auto mode dead band is set to around 1.5°C (SP +/-1.5°C). The prevents
the system from hunting�
When controlling the AC unit from "Zones", the system will select the majority of zones requesting the same mode
(Cool or Heat). If the majority changes, the mode will be permitted to change, after the new majority's controlling
temperature has exceeded the dead band.
If the number of zones requiring cooling and heating are the same (ie. no majority) the system will run in the mode
it was last in.
For example (see below):
3 zones require cooling and 2 zones require heating the Rinnai Home will start running the system in Cool. The
zones requiring heating will close when the supply air temperature sensor detects cool air.
If the zones requiring cooling reduces to 2 with 1 zone moving from past the set point from cooling to heating and
2 zones still requiring heating the majority of zones will change to heating. The mode will change the mode from
Cool to Heat ( provided one of the heating zones is outside the dead band. The zones requiring cooling will close
when the supply air temperature sensor detects warm air.
After some time the heating zones achieve set point. However, the mode remains in heating even though all 5
zones require cooling as they are all within the dead band. After more time one of the zones drifts outside the
cooling dead band and the mode changes from Heat to Cool. The zones requiring heating will close when the
supply air temperature sensor detects cool air�
The available fan speeds are:
Low
Med
High
Auto
Med
High
Auto
Low
Low – Select to run the system on Low fan speed
Med – Select to run the system on Medium fan speed
High – Select to run the system on High fan speed
Auto – Selecting Auto (if available) will allow the system to automatically adjust the fan speed depending on
the number of zones that are Open or in Climate (Auto) control. This is a dynamic function, as zones dampers
modulate open and closed the systems fan speed will adjust accordingly. The installer must enable Auto fan speed
during configuration of the system for this option to be visible on the user interface.
Rinnai
7
Air Conditioning Control System OM
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