Configuration
When installing a remote sensor you must enable the remote sensor option. See
“
Installer/Configuration Menu
”
in IM 1178.
Troubleshooting Chart
To function correctly and read temperature accurately, the thermostat (when set up for a remote as outlined above) must have
constant 24-volt power. If the thermostat temperature is steadily dropping, reading low, or reads 08° when a remote sensor is
installed, it can be traced to one of the three following conditions.
Condition
Test
Comments
1. Loss of 24-volt power.
On models with batteries, remove the batteries and re-
install thermostat. If the display is blank, check heating and
cooling system to determine why 24-volt power is absent.
For the sensor to read correctly, the 24-volt system power must
be present. Some systems may require an isolation relay to
provide constant power to the thermostat. Limit or safety
devices in the equipment can also cause a power interruption
2. A broken wire on +, SA, - from
the thermostat to the remote.
Disconnect sensor wires at thermostat. Attach a short piece
(2') of three-wire shielded cable to (+, SA -) on the subbase.
Bring the remote sensor to the thermostat, location and
attach (+, S, -) respectively. Reattach thermostat. If the
temperature begins to climb (slowly), it is reading correctly.
If it reads correctly with the 2' length but improperly when
attached to the wire run, it indicates a fault in the wire run.
Repair or replace the 3 wire shielded cable. Be sure the remote
wire run is not parallel to line voltage wires that carry heavy in
-
ductive loads, or across fluorescent light ballasts that may cause
an inductance to be transmitted to the thermostat.
3. A shorted or damaged remote
sensor.
Because it is an electronic sensor, there are no Ohm values
to test. If correct conditions as listed in 1 & 2 above and the
temperature stays at or near 08°, it indicates a shorted or
damaged remote sensor.
Replace remote sensor.
Note:
Digital thermostats and remote sensors acclimate very slowly to temperature change. It may take an hour or more for the
temperature to acclimate to the room temperature from a low temperature reading as outlined above. To expedite the room
temperature display use the reset instructions listed in the installation instructions for the thermostat model you are working
with. When reset, the thermostat will default to a room temperature of 70° and begin sensing room temperature. Be sure to
reconfigure the installer menu for a remote sensor because the reset function may cancel remote sensing.
©2013 Daikin Applied •
www.DaikinApplied.com
• 800.432.1342
IOM 1175 / Page 4 of 4
