Honeywell T4 Pro Installation Instructions Manual page 7
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- User manual (19 pages) ,
- Installation instructions manual (37 pages) ,
- Installation instructions manual (37 pages)
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Advanced setup options (ISU) (continued)
# ISU
ISU Name
218
Reversing Valve O/B
220
Cool Stages / Compressor Stages
200=Conv / 200=HP
221
Heat Stages / Backup Heat Stages
230
Fan Control in Heat
300
System Changeover
303
Auto Changeover Differential
365
Compressor Cycle Rate (Stage 1)
370
Heating Cycle Rate (Stage 1)
370
Heating Cycle Rate Auxiliary Heat
387
Compressor Protection
425
Adaptive Intelligent Recovery
430
Minimum Cool Setpoint
431
Maximum Heat Setpoint
ISU Options (factory default in bold)
0 = O (O/B in Cool)
1 = B (O/B in Heat)
Note: This option is only displayed if the Heat Pump configured. Select
whether reversing valve O/B should energize in cool or in heat.
0, 1
Note: Select how many Cool or Compressor stages of your equipment
the thermostat will control. Set value to 0 if you do not have Cool Stage/
Compressor Stage.
1
Note: Select how many Heat or Aux/E stages of your equipment the
thermostat will control.
1 = Equipment Controls Fan
2 = Thermostat Controls Fan
Note: This ISU is only displayed if ISU 205 is set to Electric Forced Air or
Fan Coil.
0 = Manual
1 = Automatic
Note: Thermostat can automatically control both heating and cooling to
maintain the desired indoor temperature. To be able to select "automatic"
system mode on thermostat home screen, turn this feature ON. Turn OFF
if you want to control heating or cooling manually.
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.
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Note: This ISU is only displayed when Cool /Compressor Stage is set to
1 stage. Cycle rate limits the maximum number of times the system can
cycle in a 1 hour period measured at a 50% load. For example, when set
to 3 CPH, at a 50% load, the most the system will cycle is 3 times per
hour (10 minutes on, 10 minutes off). The system cycles less often when
load conditions are less than or greater than a 50% load.
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Note: This ISU is only displayed when Heat Stage is set to 1 stage. Cycle
rate limits the maximum number of times the system can cycle in a 1
hour period measured at a 50% load. For example, when set to 3 CPH,
at a 50% load, the most the system will cycle is 3 times per hour (10
minutes on, 10 minutes off). The system cycles less often when load
conditions are less than or greater than a 50% load. The recommended
(default) cycle rate settings are below for each heating equipment type:
Standard Efficiency Gas Forced Air = 5 CPH; High Efficiency Gas Forced
Air = 3 CPH; Oil Forced Air = 5 CPH; Electric Forced Air = 9 CPH; Fan Coil =
3 CPH; Hot Water Radiant Heat = 3 CPH; Steam = 1 CPH.
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0 = Off
1 - 5 minutes
Note: The thermostat has a built in compressor protection (minimum
off timer) that prevents the compressor from restarting too early after
a shutdown. The minimum-off timer is activated after the compressor
turns off. If there is a call during the minimum-off timer, the thermostat
shows "Wait" in the display. This ISU is displayed if ISU 220 is set to at
least 1 stage.
0 = No
1 = Yes
Note: Adaptive Intelligent Recovery (AIR) is a comfort setting. Heating or
cooling equipment will turn on earlier, ensuring the indoor temperature
will match the setpoint at the scheduled time.
50 °F to 99 °F (50 °F)
10.0 °C to 37.0 °C (10.0 °C)
Note: The cool temperature cannot be set below this level.
40 °F to 90 °F (90 °F)
4.5 °C to 32.0 °C (32 °C)
Note: The heat temperature cannot be set above this level.
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