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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)
(TH6320 / TH6220 only)
256
Emergency Heat Source (TH6320U
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
Compressor Cycle Rate (Stage 1)
365
366
Compressor Cycle Rate (Stage 1)
370
Heating Cycle Rate (Stage 1)
371
Heating Cycle Rate (Stage 2)
375
Heating Cycle Rate Auxiliary Heat
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. Honeywell uses an advanced algorithm that
fixes deadband at 0 °F. The differential setting is the minimum number of degrees
from set-point needed to switch from the last mode running (heat or cool) to the
opposite mode when the thermostat is in auto-changeover. 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
Note: 0 (comfort) setting only available if backup heat (ISU 255) is set to electric.
0 = Off
1 = 30 minutes
2 = 45 minutes
3 = 60 minutes
4 = 75 minutes
-- = 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
1 - 12
9
9 = 9 °F
10 = 10 °F
11 = 11 °F
12 = 12 °F
13 = 13 °F
14 = 14 °F
15 = 15 °F
5 = 90 minutes
6 = 2 hours
7 = 3 hours
8 = 4 hours
10 = 5 hours
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