20
System
System
Operating Mode
Airflow Demand
Source
Cooling
Air Conditioner
Heating
Air Handler
Continuous Fan
Thermostat
Cooling
Heat Pump
Heat Pump Heating
Only
Heat Pump
HP + Electric Heat
Strips
> of Heat Pump or Air
Handler Demand
Electric Heat Strips
Only
Air Handler
Continuous Fan
Thermostat
Air Condi
Air Handler
Heat Pump + Air
Handler
Figure 32
18.3 Control Wiring
NOTE
: Refer to section Electrical Connections for 208/230 volt
line connections to the air handler.
NOTE
: A plug connector is provided with the control to make
thermostat wire connections. Wire nuts are recommended to
ensure one wire is used for each terminal. Failure to do so may
result in intermittent operation.
Typical 18 AWG thermostat wire may be used to wire the
system components. One hundred and fifty (150) feet is the
maximum length of wirerecommended between indoor unit and
outdoor unit, or between indoor unit and thermostat.
Only the data lines 1 and 2 are requiried between the indoor and
outdoor units. A 40VA, 208/230 VAC to 24 VAC transformer in
the outdoor unit to provide 24 VAC power to the outdoor unit’s
electronic control.
1
2
C
R
1
2
R
C
Communica ng Thermostat
(In case of Daikin
One
+ Smart
Thermostat)
Air Handler Blower
Integrated Control Module
Outdoor Unit
Integrated Control Module
125 (*)
250 (*)
(*) Allowable Maximum Length
1
2
R
C
Figure 33
Please read carefully before installing this unit.
•
Power line terminal #C from Indoor unit must connect to
terminal #C on thermostat and power line terminal #R from
indoor unit must connect to terminal #R on thermostat.
Verify wires are not reversed. (Note: The order of the
terminals of the indoor unit and the Daikin
ONE
+ thermostat
may be different.)
•
Do not attach any wires to the R&C Terminals on the AC/HP,
as they are not needed for inverter unit.
•
Data Line Terminal #1 from AC/HO must connect to terminal
#1 on indoor unit and thermostat and data line terminal #2
from AC/HP must connect to terminal #2 on indoor unit and
thermostat. Verify wires are not reversed.
ATTENTION INSTALLER - IMPORTANT NOTICE
18.4 Fully Communicating Daikin System Advanced Features
The Communicating system permits access to additional
system information, advanced set-up features, and advanced
diagnostic/troubleshooting features. These advanced features
are organized into a menu structure. If you are using a Daikin
One+
Smart Thermostat, please visit website at
https://www.daikinone.com for instructions.
18.5 Diagnostics
Accessing the air handler’s diagnostics menu provides ready
access to the last six faults detected by the air handler. Faults
are stored most recent to least recent. Any consecutively
repeated fault is stored a maximum of three times. Example:
A clogged return air filter causes the air handler’s motor to
repeatedly enter a limiting condition. The control will only store
this fault the first three consecutive times the fault occurs.
NOTE:
It is highly recommended that the fault history be
cleared after performing maintenance or servicing the air
handler.
18.5.1 Network Troubleshooting
The Communicating system is a fully communicating system,
and thus, constitutes a network. Occasionally the need
to troubleshoot the network may arise. The integrated air
handler control has some on-board tools that may be used to
troubleshoot the network. These tools are: red communications
LED, green receive (Rx) LED, and learn button. Refer to the
Communications Troubleshooting Chart at the end of this
manual for error codes, possible causes and corrective actions.
• Red communications LED – Indicates the status of the
network. The table below indicates the LED status and the
corresponding potential problem.
• Green receive LED – Indicates network traffic. The table
below indicates the LED status and the corresponding
potential problem.
• Learn button – Used to reset the network. Depress the
button for approximately 2 seconds to reset the network.
