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ADDITIONAL
5
OPERATION FEATURES
(see section 4.4)
Recirculating Fan Mode
5.3
The Recirculating Fan Mode provides more even temperature distribution and improves
indoor air quality by circulating air through the furnace filtration system more often.
The Recirculating Fan Mode can be selected by moving the fan switch to the recirculate
position
. If no call for heating or cooling occurs within the fan off cycle set in section
®
4.4, the fan will run for 12 minutes. The highest setting, 120 minutes (factory default), will
run the fan least often–10% minimum run time. The lowest setting, 40 minutes, will run the
fan most often–30% minimum run time. During any call for heating or cooling, fan control
operates in the AUTO mode. This feature is available in the HEAT, OFF, or COOL mode.
Keypad Lockout
5.4
To prevent accidental or undesired adjustment of the
thermostat set point, the Keypad Lockout feature
disables the operation of the temperature setting keys,
but not the backlight key. In order to enable the keypad
lock, press and hold either the
or
button together
with the backlight button for 5 seconds. The LOCK icon
in the display will flash once per second, then appear
continuously in the display. The keypad is now locked.
To unlock the keypad, press and hold either the
for 1 second. The LOCK icon will disappear from the display, and the key pad is now unlocked.
Low Temperature "Freeze" Protection
5.5
While the thermostat is in the HEAT mode of operation on standard heating (non-heat pump)
applications, the thermostat will mechanically initiate a call for heat if the room temperature
drops to less than 41˚F (5˚ C). The system selector switch must be in the HEAT position for
this feature to be active. This feature will allow the thermostat to initiate a call for heat on
standard heating (non-heat pump) applications, to provide a minimum amount of heat, even
if the batteries are dead or missing. Call a professional service technician immediately to
verify proper system operation. This feature is only active on standard heating (non-heat
pump) applications and is not available on single stage heat pump applications.
cont.
or
button together with the backlight key
6
ADDITIONAL
5
OPERATION FEATURES
Compressor Protection Feature
5.6
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.
NOTE:
The installer can reset the thermostat and bypass the compressor protection
feature by pressing the RESET button. This will erase all user program 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.
Low Battery Detection and Replacement
5.7
This thermostat requires two (2) properly installed
"AA" alkaline batteries to provide power for the
thermostat to properly control the system operation.
The system must have 24 Volt AC power present for
proper system operation and control. 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.
Replacing the Batteries
1. Open front thermostat 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.
Resetting Thermostat
5.8
The Reset feature allows the user to completely reset the thermostat. To erase all entered
program settings, gently press the RESET button using a paper clip or a small pencil tip.
This will return all thermostat settings to their default values and register all new manual
switch settings.
cont.
7
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