14
Installer setup options (ISU)– advanced menu
# ISU ISU Name ISU Options (defaults in bold) Notes
355 Balance Point
(Compressor Lockout)
Off, 5 °F to 60 °F (in 5 °F increments) or
15.0 °C to 15.5 °C (in 2.5 °C or 3.0 °C increments)
Compressor Lockout requires an outdoor temperature. Set Compressor Lockout to the temperature below
which it is inefficient to run the heat pump. When outside temperature is below this setting, thermostat will
lockout heat pump and run Aux Heat only. This ISU is only displayed if ISU 130 = Wired or Internet, ISU 200 is
set to Heat Pump, ISU 221 Aux/E stages = 1, AND ISU 260 is set to Thermostat. We recommend using a wired
remote sensor as an outdoor temperature source.
Default is 40 °F (4.4 °C) if ISU 205 Heating Equipment is Air to Air Heat Pump and ISU 255 Aux Heat Type is
Gas/Oil.
Default is Off if ISU 205 Heating Equipment is Air to Air Heat Pump and ISU 255 Aux Heat Type is Electric.
Default is Off if ISU 205 Heating Equipment is Geothermal.
Compressor Lockout is optional for any type of heat pump (Air to Air Heat Pump, Geothermal Heat Pump).
356 Aux Heat Lock Out
(Aux Heat Outdoor
Lockout)
Off, 5 °F to 65 °F (in 5 °F increments) or
15.0 °C to 18.5 °C (in 2.5 °C or 3.0 °C increments)
Aux Heat Lockout requires an outdoor temperature. Set Aux Heat Lockout to optimize energy bills and to not
allow it to run the more expensive Aux Heat source above certain outdoor temperature limit. This ISU is only
displayed if ISU 200 is set to Heat Pump, AND ISU 260 is set to Thermostat control AND if ISU 221 Aux/E
stages = 1.
365 Cool 1 CPH (Cooling
cycle rate stage 1)
1 - 6 CPH (3 CPH) 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 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.
366 Cool 2 CPH (Cooling
cycle rate stage 2)
1 - 6 CPH (3 CPH) This ISU is only displayed when Cool /Compressor Stages is set to 2.
370 Heat 1 CPH (Heating
cycle rate stage 1)
1 - 12 CPH 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.
371 Heat 2 CPH (Heating
cycle rate stage 2)
1 - 12 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.
375 Aux Heat CPH
(Heating cycle rate
Auxiliary Heat)
1 - 12 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.
Table 3.
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