Honeywell T6 Pro Installation Instructions Manual page 8

Advanced setup options (ISU)
# ISU ISU Name
221 Heat Stages / Backup Heat Stages
230 Fan Control in Heat
253 Aux/E terminal control (TH6320
only)
255 Backup Heat Source
(Heat Pump Only)
256 Emergency Heat Source (TH6320
only)
260 External Fossil Fuel Kit
(TH6320 / TH6220 only)
270 Backup Heat Fan
271 Emergency Heat Fan
300 System Changeover
303 Auto Changeover Differential
340 Backup Heat Droop
350 Upstage Timer for Backup Heat
355 Compressor Lockout / Balance Point
356 Outdoor Lockout Backup Heat
365 Compressor Cycle Rate (Stage 1)
366 Compressor Cycle Rate (Stage 1)
370 Heating Cycle Rate (Stage 1)
371 Heating Cycle Rate (Stage 2)
ISU Options (factory default in bold)
Heat Stages: 1, 2
Backup Heat Stages: 0, 1
1 = Equipment Controls Fan
2 = Thermostat Controls Fan
0 = Drive both Aux & E together
1 = Aux and E independent
1 = Electric Forced Air
2 = Gas/Oil Forced Air (or Fossil Forced Air)
1 = Electric Forced Air
2 = Gas/Oil Forced Air (or Fossil Forced Air)
0 = Thermostat Controls Backup Heat
1 = External Fossil Fuel Kit Controls Backup Heat
1 = Equipment Controls Fan
2 = Thermostat Controls Fan
Note: Setting only active with TH6320 in Heat Pump mode.
1 = Equipment Controls Fan
2 = Thermostat Controls Fan
Note: Setting only active with TH6320 in Heat Pump mode.
0 = Manual
1 = Automatic
0 °F to 5 °F
0.0 °C to 2.5 °C
Note: Differential is NOT deadband. Differential means how far past the setpoint
before switching to the mode selected. Deadband setup is not an option.
Honeywell uses an advanced algorithm that fixes deadband at 0 °F. This is more
advanced than previous thermostats.
0 = Comfort
2 = 2 °F
3 = 3 °F
4 = 4 °F
5 = 5 °F
6 = 6 °F
7 = 7 °F
8 = 8 °F
0 = Off
1 = 30 minutes
2 = 45 minutes
3 = 60 minutes
4 = 75 minutes
5 = 90 minutes
6 = 2 hours
7 = 3 hours
8 = 4 hours
10 = 5 hours
-- = Off
5 °F to 60 °F (in 5 °F increments)
-15.0 °C to 15.5 °C (in 2.5 °C or 3.0 °C increments)
Note: Use a wired sensor to set compressor lockout / balance point on TH6320
/ TH6220.
-- = Off
5 °F to 65 °F (in 5 °F increments)
-15.0 °C to 18.5 °C (in 2.5 °C or 3.0 °C increments)
1 - 6
1 - 6
1 - 12
1 - 12
8
9 = 9 °F
10 = 10 °F
11 = 11 °F
12 = 12 °F
13 = 13 °F
14 = 14 °F
15 = 15 °F