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# ISU
ISU Name
ISU Options (defaults in bold)
Cool 1 CPH (Cooling
1 - 6 CPH (3 CPH)
365
cycle rate stage 1)
366
Cool 2 CPH (Cooling
1 - 6 CPH (3 CPH)
cycle rate stage 2)
370
Heat 1 CPH (Heating
1 - 12 CPH
cycle rate stage 1)
371
Heat 2 CPH (Heating
1 - 12 CPH
cycle rate stage 2)
375
Aux Heat CPH
1 - 12 CPH
(Heating cycle rate
Auxiliary Heat)
378
EM Heat CPH
1 - 12 CPH
(Heating cycle rate
Emergency Heat)
387
Compressor
Off, 1 - 5 minutes
Protection
Off, 30, 60, 90 seconds
390
Ext Fan Run Time
in Cool
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 minutes
Off, 30, 60, 90 seconds
391
Ext Fan Run Time
in Heat
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 minutes
Notes
This ISU is only displayed when Cool /Compressor Stages is set to 1 or more stages. Cycle rate limits the maxi- mum
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 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.
This ISU is only displayed when Cool /Compressor Stages is set to 2.
This ISU is only displayed when Heat Stages is set to 1 stage or more stages. 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.
This ISU is only displayed when Heat Stages is set to 2 stages. 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.
This ISU is only displayed when ISU 200 = Heat Pump and ISU 221=1. It is only displayed when Auxiliary Heat
is configured. The recommended 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
This ISU is only displayed when Emergency Heat is configured and ISU 253: Aux/E Terminal Control is set to
control Aux and E heat Independently. The recommended cycle rate settings are below for each heating equip-
ment 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.
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 "Cool on" or "Heat On" (heat pump) status
blinking on the thermostat home screen. This ISU is displayed if ISU 220 is set to at least 1 stage.
After the call for cooling ends, the thermostat keeps the fan on for the selected amount of time for increased
efficiency. This may reintroduce humidity into the living space. This ISU is displayed if ISU 220 is set to at least
1 stage.
After the call for heating ends, the thermostat keeps the fan on for the selected amount of time for increased
efficiency. This ISU is displayed if ISU 230 is set to Thermostat Controls Fan.
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