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23
3
ADDITIONAL
OPERATION FEATURES
cont.
3
ADDITIONAL
OPERATION FEATURES
cont.
3.15
Compressor Protection and AC Power Monitor
This thermostat includes an automatic compressor protection feature to avoid potential damage to the cooling
system from short cycling. This thermostat automatically provides a delay (see section 4 of the Installer Guide)
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.
If enabled during Installer Setup (see section 4 of the Installer Guide), this thermostat also provides cold weather
compressor protection by locking out the compressor stage(s) 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 set point temperature. The
compressor lockout can be manually overridden at any time by changing the system mode to OFF momentarily,
then back to HEAT.
NOTE:
This feature only applies to 2 or 3 Stage Heat Pump Systems.
During a power loss, the thermostat will display an outage warning
if enabled during Installer Setup (see section 4 of the Installer Guide).
The system clock will continue to run, and all settings will be
maintained until the outage period is over.
3.16
Temporary Override Adjustment Limits
(see section 2.4.7 for settings)
The Temporary Override Adjustment Limits limit how much the
thermostat can be adjusted from the program set points when the
thermostat is used in the programmable mode. This will not allow
the user to set a temporary override in the heat or cool mode past
the limit from the program set points.
The Temporary Override Adjustment Limits can only be used in the non-programmable mode when the security
level is at level 1. This will not allow the user to temporary override in the heat or cool mode past the limit from
the program set points.
3.17
Humidification and Dehumidification
If the thermostat is connected to a whole house humidifier and
humidity control is enabled in the installer options, the 5400 can be
used to control the humidity level during the heating season. The
current room humidity and the humidity set point can be displayed
by pressing the
PROG
and
DAY/TIME
button at the same time. If
either the or button is pressed before the unit returns to the
normal mode (in 15 seconds), the humidification set point changes while
SET
flashes. Pressing the
PROG
button
before the unit returns to the normal mode sets the dehumidification set point, if dehumidification control is
enabled in the installer options. If dehumidification is not enabled, then the unit will return to the normal mode
in 15 seconds after the last or button press.
If dehumidification control is enabled in the installer options, the air conditioning system can be used to reduce
humidity during the cooling season. If the room humidity level is above the dehumidification set point, the air
conditioning system may run until the room temperature is several degrees lower than the cooling set point, or
until the room humidity level reaches the dehumidification set point (which ever comes first).
