24
3
ADDITIONAL
OPERATION FEATURES
cont.
3.17
Humidification and Dehumidification
(continued)
If both humidification and dehumidification control are not enabled,
the current room humidity level can still be displayed by pressing
the
PROG
and
DAY/TIME
buttons at the same time. The unit will
return to the normal mode in 15 seconds.
NOTE:
If Automatic Humidity Limiting was enabled in the installer
options, the humidification set point may be automatically adjusted
to compensate for changes in outdoor temperatures.
3.18
Low Battery Detection and Replacement
This thermostat requires two (2) properly installed “AA” Alkaline
batteries to maintain the system clock and to provide power for
the thermostat if 24 volt AC power is not connected to the terminal
block. This thermostat is equipped with a low battery detection
feature that constantly monitors the batteries during normal
operating mode to determine whether they have sufficient power
to provide proper operation. When this feature determines that the
battery status is low, a solid low battery indicator will appear in the
display for 30 days. It is recommended that the batteries be replaced
immediately to maintain system operation and / or clock settings.
If the battery continues to be low, the indicator will flash every 2 seconds for 30 days. After 30 days the battery
indicator will start to flash every 1 second until the batteries are replaced.
Replacing the Batteries
1.
Open the front cover and locate the battery compartment door.
2.
Gently remove the two “AA” Alkaline batteries located in the battery compartment.
3.
Install two new “AA” Alkaline batteries into battery compartment. Make sure to match the positive (+) ends of
the batteries with the positive (+) terminals located in the battery compartment.
4.
Close battery compartment and verify that the low battery indicator does not appear in the display.
25
4
TROUBLESHOOTING
®
Symptom:
Fan continues to run in cooling mode when the system has turned off.
Potential Solution:
The Residual Cooling Fan Control Feature can allow up to a 90 second fan delay after cooling
system shutdown for energy efficiency gains. The default setting is 60 seconds. This can be changed to disable this
feature or shorten the time period if desired (see section 4 of the Installer Guide).
Symptom:
Thermostat does not turn on heating or cooling system.
Potential Solution:
Check to see if
OFF
is shown in display. This indicates that the system is turned off at the
thermostat. Press the system button to select
HEAT
or
COOL
mode. After the compressor short cycle protection period
expires the system should start within several seconds.
Compressor protection features may be in effect due to compressor short cycle conditions, power outages or rolling
blackouts. See section 3.15 for full explanation of this feature.
Heat pump may be malfunctioning. Look in the lower left corner of the thermostat display. If the word
CHECK
is present,
call a professional service technician to confirm heat pump operation and provide necessary service. If heating is
required, you can press the system button to
EMER
setting, which may start the Emergency Heat source to provide
heating until the heat pump can be serviced.
Symptom:
Thermostat turns on heating instead of cooling, or cooling instead of heating.
Potential Solution:
Check thermostat wiring to make sure that the heating and cooling stages are connected to the
correct terminals on the wiring terminal block (see Installer Guide, section 6).
Symptom:
Fan runs intermittently or when system is off.
Potential Solution:
This is normal operation when fan switch is in recirculate ( ) mode.
Symptom:
System turns on prior to the end of a setback period.
Potential Solution:
Thermostat is in Adaptive Recovery Mode (see section 3.11).
Symptom:
Thermostat turns heating or cooling system on too often or not often enough.
Potential Solution:
Increase or decrease first stage temperature differential setting as appropriate to provide the
desired performance level (see section 2.4).
