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6.3.4.4. Low Ambient Cooling
Selecting YES will enable the low ambient cooling operation in the
outdoor unit. This setting is only available with compatible
communicating outdoor units and with Cooling Lockout set to NONE.
Low ambient kits are not needed with many communicating outdoor
units. Refer to the outdoor unit Product Data or Installation Instructions
for more information. After the selection is made, touch SAVE.
• Low Ambient Cooling: Yes or No. Default = No
6.3.4.5. Quiet Shift
This option turns on Quiet Shift function in 1-stage or 2-stage
communicating heat pumps. After the selection is made, touch SAVE.
NOTE: This option is not available with variable speed heat pumps nor
geothermal units.
• Quiet Shift: On or Off. Default = Off
6.3.4.6. AC/Heat Pump RPM Max
Used with variable capacity heat pumps, this option clamps the
operating speed of the heat pump to this maximum. Used to reduce
operating noise while in high heating capacity. Reducing this value will
reduce the heating capacity of the heat pump. After the selection is made,
touch SAVE.
• AC Heat Pump Max RPM: Adjustable from 4500 – 7000. Default =
7000 RPM
6.3.4.7. Defrost Fan Delay
Turns on the outdoor unit fan at the end of a defrost cycle for
approximately 12 seconds. This helps to reduce any nuisance refrigerant
noise caused by the switching reversing valve. This setup is only
available on communicating heat pumps. After the selection is made,
touch SAVE.
• Defrost Fan Delay: Yes or No. Default = No
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