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MULTISTAGE ELECTRONIC THERMOSTAT
System
Fan
Press to select
Press to select
heating or cooling
heating or cooling
equipment.
equipment.
Em. Ht.-Emergency heating
On— Fan runs continuously
Heat— Heating equipment
Auto—Fan runs when
Off — No equipment
heating or cooling
Cool—Cooling equipment
equipment operates
Auto—Thermostat
automatically selects
heating and cooling
equipment.
Fig. 7. TAYSTAT 375 System and Fan keys.
NOTE: Always press the System and Fan keys with
your fingertip or similar blunt tool. Sharp
instruments like a pen or pencil point can
damage the keyboard.
Temperature Settings
The default setpoint for heat is 70°F (21°C) and for cool is
78°F (25.5°C). Press the increase ▲ or decrease ▼ key to
change the present setting. To change between heat and
cool, press the Information i key until the setting to be
changed appears.
Cooling Droop
Cooling system operation or cycling below the setpoint
termperature is called "Cooling Droop." Thermostats
that provide this operation improve the comfort during
extended off periods by providing air circulation to
prevent stagnation and improved moisture removal due
to increased run time. Cooling Droop is most effective in
mild weather conditions and during nighttime operation
(low load). The effect of Cooling Droop on indoor
temperature operation typically lowers the indoor
temperature by up to one or two degrees. If the cooling
droop is not desired, it can be disabled.
Comfort R™
Comfort R helps achieve comfort with a lower humidity
level. When enabled (selected in installer setup) the
thermostat calculates a fan delay on a call for cool. The
calculated delay maximizes dehumidification and
comfort from the air conditioning system.
INSTALLER SETUP
NOTE: For most applications, the thermostat factory-
settings do not need to be changed. Review the
Factory Setting column in Table 2 and if no
changes are necessary, go to the Installer
System Test section.
The Installer Setup is used to customize the thermostat to
specific systems. Installer Setup Numbers are listed in
Table 2. It includes all the available configuration options.
Pub. No. 18-HD28D1-1
69-1592–1
i
System
System
Fan
Fan
M20566
A combination of key presses is required to use the
Installer Setup feature:`
1. To enter the Installer Setup mode, press and hold
the Information i key and the increase ▲ and
decrease ▼ keys to display the first number. All
display segments appear for approximately three
seconds before the number displays. See Fig. 8
and 9.
2. To advance to the next Installer Setup number,
press the Information i key.
3. To change a setting, press the increase ▲ or
decrease ▼ key.
4. To exit the Installer Setup, press and hold the
Information i key until the display returns to
normal (approximately three seconds). The display
scrolls the numbers backward to the normal display.
The Installer Setup is automatically exited if no key
presses are made for five minutes.
IMPORTANT
Only configurable numbers are shown on the
device; for example, if the thermostat does not
have a System key, Installer Setup Number 12
will not be displayed. Review Table 2 Factory
Settings column and mark any desired changes
in the Actual Setting column. When Installer
Setup in complete, review the settings to confirm
they match the system.
Em Ht Temporary Setting
Aux Ht
Repl
Wait
Batt
System
Em HeatOffCool Auto Only
Fig. 8. Display of all LCD segments.
Fig. 9. Display of installer setup mode and setting.
CAUTION
Equipment Damage Hazard.
Can cause equipment damage.
Configure heat pump and electrical heat systems
to 01 in Installer Setup Number 02 to prevent
equipment damage caused by running the system
without the fan.
4
Remote
Room
%Humid
Outdoor
Heat Cool
Fan
OnAuto
MODE NUMBER DISPLAY
(COLUMN 2 OF TABLE 2)
FACTORY SETTING OR
OTHER CHOICE DISPLAY
(COLUMN 3 OR 5 OF TABLE 2)
M4844
M10105
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