Honeywell T6 Pro Installation Instructions Manual page 8

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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

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