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# ISU ISU Name ISU Options (factory default in bold)
350 Upstage Timer for Backup
Heat (TH4210U only)
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
365 Compressor Cycle Rate
(Stage 1)
1 - 6
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.
370 Heating Cycle Rate (Stage 1) 1 - 12
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.
375 Heating Cycle Rate Auxiliary
Heat (TH4210U only)
1 - 12
387 Compressor Protection 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.
425 Adaptive Intelligent Recovery 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.
430 Minimum Cool Setpoint 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.
431 Maximum Heat Setpoint 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.
435 Keypad Lockout
0 = None
1 = Partial
2 = Full
Note:
Unlocked: User has access to all thermostat settings.
Partially Locked: User can modify only temperature settings.
Fully Locked: User cannot modify any settings. Screen will be
locked by default factory code and cannot be changed. This
code is displayed for a short time, when you are about to lock the
thermostat screen. Please
note the code in safe place for future reference.
Advanced setup options (ISU) (continued)
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