TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
9
69-1706
OPERATION
System and Fan Settings
The System default setting is Heat and the Fan default
setting is Auto.
SYSTEM SETTINGS
Heat: Thermostat controls heating system.
Off: Both heating and cooling are off.
Cool: Thermostat controls cooling system.
Auto: Thermostat automatically changes between
heating and cooling systems, depending on indoor
temperature. (See Installer Setup section.)
Em Heat: Emergency heat cycles to maintain
temperature. Compressor is locked out. (Used only for
heat pump systems with backup heat.)
FAN SETTINGS
The Fan setting can be programmed into the thermostat
schedule for each period (Wake, Leave, Return, Sleep).
See the Owners’ Guide for additional information.
LED Indication (Requires 24 Vac Common
Connection)
An LED indicator is located in the upper right corner of
the thermostat. It is only visible when lighted:
• It indicates when the thermostat is in the Emergency
Heat mode. When in Em. Ht. mode, the L terminal is
continuously energized and the LED is on.
• When the L terminal is wired to an equipment monitor,
the LED signals when a check or fail signal is sent to
the thermostat from the system. See Fig. 21. (This
can occur only when the thermostat is not in Em. Ht.
mode.)
Fig. 21. L terminal switch to R (power) side of system
transformer.
Preprogrammed Settings
Table 3 shows the default program settings. See Owners’
Guide for complete instructions on changing the
program.
INSTALLER SETUP
This Universal Thermostat works with many different
system types. To operate correctly, the thermostat must
be set up to operate the installed heating and/or cooling
system.
Installer Setup Menus
Main Menu:
Offers the most commonly used options.
It is necessary to enter this menu to set the
thermostat to the type of system it is operating. Many
applications use only the Main Menu.
Regional Menu:
Offers choices often changed due to a
particular area or region. For example, temperature
display in Fahrenheit or Celsius is offered in this menu.
Advanced Settings Menu:
Offers more settings to fully
customize the thermostat. Many of these settings do not
require changing from the factory settings.
Entering Installer Setup
1.
Thermostat must be powered either with Alkaline
AAA batteries or with 24 Vac Common wire.
2.
From the home screen, press System key. (Press
Done or Cancel key to return to home screen.)
3.
Five blank touch keys show on the bottom of the
screen between the Done and Cancel keys. Press
and hold the two blank keys on either side of the
center blank key for approximately five seconds
until screen changes. See Fig. 22.
Fig. 22. Entering Installer Setup.
Table 3. Default Program Settings.
Schedule
Period
Time
Setpoints
Fan
Setting
Heat Cool
Wake
6:00AM
70
°
F
(21
°
C)
78
°
F
(25.5
°
C)
Auto
Leave
8:00AM
62
°
F
(16.5
0
C)
85
°
F
(29.5
0
C)
Auto
Return
6:00PM
70
°
F
(21
°
C)
78
°
F
(25.5
°
C)
Auto
Sleep
10:00PM 62
°
F
(16.5
°
C)
82
°
F
(28
°
C)
Auto
M19907
EQUIPMENT
MONITOR
L
TO R
TO C
C
DONE
CANCEL
MON
TUE
WED
THU
FRI
SAT
AAT
SUN
PM
SYSTEM
EM HEAT
OFF
COOL
Following
Schedule
Inside
Set To
M19923
