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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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Need help?
Do you have a question about the T6 Pro and is the answer not in the manual?
Questions and answers
reset wifi Pro T6
How to set pro series for permanent hold
To set the Honeywell T6 Pro thermostat for a permanent hold, follow these steps:
1. Adjust the temperature setting on the thermostat display.
2. A “HOLD UNTIL” message will appear, followed by the time of the next schedule change.
3. Touch the “HOLD UNTIL” message.
4. Two new options will appear: “PERMANENT HOLD” and “RUN SCHEDULE.”
5. Touch “PERMANENT HOLD” to keep the new setting permanently.
The thermostat will maintain this temperature until it is manually changed or canceled.
This answer is automatically generated
How to change the battery
To change the battery in a Honeywell T6 Pro thermostat, follow these steps:
1. Turn Off Power: Unplug the furnace from the wall to ensure safety.
2. Remove the Thermostat: Gently pull the thermostat off the wall-mounted backplate.
3. Take Out Old Batteries: Remove the existing AA batteries.
4. Insert New Batteries: Place two fresh AA batteries, ensuring correct polarity.
5. Reattach the Thermostat: Secure the thermostat back onto the wall-mounted plate.
6. Check Display: The screen should light up, showing it is ready to use.
If batteries are replaced within two minutes, the time and day settings will remain unchanged. Other settings are stored permanently.
This answer is automatically generated