TH8320U AND TH8321U TOUCH SCREEN PROGRAMMABLE THERMOSTATS
11
69-1706
System Type
Selection
0170
1
1 Heat/1Cool
1-12
1
—1heat/1cool
2
—single-stage heat
pump (no aux. heat)
3
—heat only (no fan)
4
—heat only (with fan)
5
—hot water Series 20
(3-wire or normally open
zone valves)
6
—cool only
7
—2 heat/1cool heat
pump
8
—2 heat/2 cool
multistage conventional
9
—2 heat/1cool
multistage conventional
10
—1 heat/2 cool
multistage conventional
11
—2 heat/2 cool heat
pump (with no auxiliary
heat)
12
—3 heat/2 cool heat
pump (with auxiliary heat)
Available
options and
defaults vary
by thermo-
stat. System
selection
automatically
modifies
some default
settings and/
or hides other
Installer Set-
up options.
Fan Operation 0180
0
Conventional
applications where
equipment controls fan
operation in heat
mode.
1
Heat pump or electric
heat applications where
thermostat controls fan
operation in heat mode.
Only shown if
conventional
system is
selected. If
heat pump is
chosen, fan
defaults to
electric.
Reversing
Valve (O/B)
Operation
0190
0
O/B terminal is
energized for reversing
valve in cooling
1
O/B terminal is energized
for reversing valve in
heating
Only shown if
heat pump
system is
chosen.
Backup Heat
Source
(Auxiliary
Heat)
0200
0
Heat pump backup
heat source is electric.
1
Heat pump backup heat
source is fossil fuel.
Only shown if
2 heat/1 cool
or 3 heat/2
cool heat
pump is
chosen.
External Fossil
Fuel Kit
0210
1
External fossil fuel kit
is controlling heat
pump backup heat
0
No external fossil fuel kit
is controlling heat pump
backup heat. This thermo-
stat controls the backup
fossil fuel heat with
outdoor sensor (C7089U).
Only shown if
fossil fuel is
chosen as
backup heat
source.
Cycles per
hour (cph) for
1st Stage
Compressor
0220
3
Compressor Stage 1
cycles per hour (cph)
1-6
1-6 available;
3 is recommended.
—
Cycles per
hour (cph) for
2nd Stage
Compressor
0230
3
Compressor Stage 2
cycles per hour (cph)
1-6
1-6 available;
3 is recommended.
Only shown if
two stages of
cool are
selected.
Table 4. Main Installer Setup Menu. (Continued)
Select
Installer
Setup
Number
Factory Setting
Other Choices
Comments
Option
Description
Options
Description
