Daikin SkyAir RZR-P Series Service Manual page 71

SiUS281117
6.10.2 Economizer
When indoor and outdoor air temperatures are reversed, the compressor is stopped to let in the
outdoor air to save energy.
This operation is called economizer operation, and the equipment to detect indoor and outdoor
air temperatures and open and close the damper to perform this operation is called an
economizer.
The economizer detects indoor and outdoor air temperatures, informs the air conditioner that
the economizer operation is ready, and opens and closes the damper.
The indoor unit stops the outdoor unit when it receives a signal from the economizer and
performs air supply operation.
When the indoor air temperature is cooled down sufficiently by the economizer operation, and it
is no longer necessary (thermostat OFF), the indoor unit outputs a signal to the economizer to
close the damper.
Stop Thermostat ON
signal ∗1 to the economizer.
Normal operation
Stop indoor unit ON
signal ∗4 to the economizer.
1 Thermostat ON signal: A signal to turn ON the indoor unit thermostat and allow the
Note:
2 External input ON is an input signal to the "X11A" terminal on the PCB for additional I/O.
3 To stop the compressor while the economizer is in operation to save energy.
4 Remote control ON signal: Contact output which shows the operating status of the indoor
6.10.3 Air Purifier
When an air purifier is connected onsite, the fan is operated with the airflow rate set of the
remote controller or with the H tap.
&
1 External input ON is an input signal to the "X25A" terminal on the PCB for additional I/O.
Note:
64
• Cooling mode
&
• When the thermostat is ON
• Cooling mode
• When the thermostat is ON
&
• External input = ON ∗2
economizer to open the damper.
It turns ON the relay on the "X8A side of X23A" on the PCB for additional I/O.
unit. This signal turns on the relay "on the opposite side of X8A of X23A" on the PCB for
additional I/O.
• Remote control operation
(including thermostat OFF)
• External input = ON ∗1
Transfer Thermostat ON signal ∗1 to the
economizer.
Elimination of others
• Transfer the thermostat OFF state to the
• EV = 0 pls
Elimination of others
• The remote controller indicates cooling
• The fan tap follows the remote controller.
Remote control ON
Transfer indoor unit ON signal ∗4 to the
economizer.
Remote control OFF
Fan x tap operation
(Same operation as with the airflow rate selected
with the remote controller)
Outline of Control (Indoor Unit)
outdoor unit. ∗3
operation.
Function and Control