User manual

12 13
NOTE: The installer can reset the thermostat and bypass the compressor protection
features by pressing the RESET button. This will erase all entered programs, current time
of day, day of week and other user settings and should only be used during installation
for testing purposes or to reset a thermostat to regain normal operation. This will return
all thermostat settings to their default values. The user will have to reprogram all of the
erased settings.
This thermostat also provides cold weather compressor protection by locking out the
compressor stage (1st Stage) of heating for a period of time after a power outage greater
than 60 minutes. The lockout period is one hour less than the outage time, up to a
maximum of 12 hours. During that period of time, the auxiliary heat stage will still be
available to maintain the setpoint temperature. The compressor lockout can be manually
overridden at any time by moving the system switch to the OFF position momentarily,
then back to the heat position.
During a power loss, the thermostat will display an
outage warning. The system clock will continue to
run, and all settings will be maintained until the
outage period is over.
5.9
Compressor Protection and AC Power Monitor
TROUBLESHOOTING
6
This thermostat includes an automatic compressor protection feature to avoid potential
damage to the cooling system from short cycling. This thermostat automatically provides a
5-minute delay after turning off the cooling system output to protect the compressor. This
protection is also present in the heat mode of operation on single stage heat pump systems
to protect the compressor.
5.10
Low Battery Detection and Replacement
ADDITIONAL
OPERATION FEATURES
5
cont.
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.
The Reset feature allows the user to completely reset the thermostat to register new manual
switch settings.
1. To erase all entered programs, current time of day, day of week and other user settings,
gently press the RESET button using a paper clip or a small pencil tip.
2. This will return all thermostat settings to their default values and register all new manual
switch settings for proper operation.
SYMPTOM POTENTIAL SOLUTION
Thermostat does not
turn on heating or
cooling system.
Check to see if OFF is shown in display. This indicates that the
system is turned off at the thermostat. Move the system selector
switch to the HEAT or COOL position. After the compressor short
cycle protection 5-minute period expires the system should start
within a minutes time.
Compressor protection features may be in effect due to
compressor short cycle conditions, power outages or rolling
blackouts. See Compressor Protection Features section for full
explanation of this feature.
Heat pump may be malfunctioning. Review the CHECK status
indicator light to see if it is. If the CHECK status indicator light is
lit, call a professional service technician to confirm heat pump
operation and provide necessary service. If heating is required
you can slide the system switch to EMER setting which will start
the Emergency Heat source to provide heating until the heat
pump can be serviced.
Check thermostat wiring to make sure that the heating and
cooling stages are connected to the correct terminals on the
wiring terminal block. See Installation and Wiring Diagram
sections of this manual.
Fan runs
intermittently or
when system is off.
Fan switch is in recirculate ( ) mode.
ADDITIONAL
OPERATION FEATURES
5
cont.
DAY
5.12
Resetting the Thermostat
5.11
Multi-Colored LED Status Indicators
The three multi-colored LED Status Indicator located on the front of your thermostat above the
display will notify you of key system information.
AUX (Green): This will turn on when the auxiliary second stage of heating is active. The
auxiliary stage of heating is usually the least economical stage of heat.
CHECK (Red): Indicator will activate when a malfunction occurs in the heat pump system.
When the light is active, call a professional service technician to verify system
performance and switch the system to Emergency Heat Mode if required to
maintain room temperature.
EMER (Red): This indicator will light when you select Emergency Heat Mode of operation using
the system selector switch. When you select Emergency Heat Mode, the heat
pump stage of heat is turned off and the emergency (auxiliary) stage of heating
is used to maintain the setpoint temperature.
This thermostat requires two (2) properly installed "AA" alkaline batteries to provide power
for the thermostat to properly control the system operation.
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 low battery indicator will appear in the display.
It is recommended that the batteries be replaced immediately
to maintain system operation and program settings.
Thermostat turns on
heating instead of
cooling, or cooling
instead of heating.