8
# ISU
ISU Name
ISU Options (factory default in bold)
221
Heat Stages / Backup Heat Stages
Heat Stages:
1
, 2
Backup Heat Stages: 0,
1
230
Fan Control in Heat
1 = Equipment Controls Fan
2 = Thermostat Controls Fan
253
Aux/E terminal control (TH6320
only)
0 = Drive both Aux & E together
1 = Aux and E independent
255
Backup Heat Source
(Heat Pump Only)
1 = Electric Forced Air
2 = Gas/Oil Forced Air (or Fossil Forced Air)
256
Emergency Heat Source (TH6320
only)
1 = Electric Forced Air
2 = Gas/Oil Forced Air (or Fossil Forced Air)
260
External Fossil Fuel Kit
(TH6320 / TH6220 only)
0 = Thermostat Controls Backup Heat
1 = External Fossil Fuel Kit Controls Backup Heat
270
Backup Heat Fan
1 = Equipment Controls Fan
2 = Thermostat Controls Fan
Note: Setting only active with TH6320 in Heat Pump mode.
271
Emergency Heat Fan
1 = Equipment Controls Fan
2 = Thermostat Controls Fan
Note: Setting only active with TH6320 in Heat Pump mode.
300
System Changeover
0 = Manual
1 = Automatic
303
Auto Changeover Differential
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.
340
Backup Heat Droop
0 = Comfort
2 = 2 °F
3 = 3 °F
4 = 4 °F
5 = 5 °F
6 = 6 °F
7 = 7 °F
8 = 8 °F
9 = 9 °F
10 = 10 °F
11 = 11 °F
12 = 12 °F
13 = 13 °F
14 = 14 °F
15 = 15 °F
350
Upstage Timer for Backup Heat
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
355
Compressor Lockout / Balance Point
-- = 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.
356
Outdoor Lockout Backup Heat
-- = 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)
365
Compressor Cycle Rate (Stage 1)
1 - 6
366
Compressor Cycle Rate (Stage 1)
1 - 6
370
Heating Cycle Rate (Stage 1)
1 - 12
371
Heating Cycle Rate (Stage 2)
1 - 12
Advanced setup options (ISU)