Bryant Evolution Connex Control, Installation Instructions Manual

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6.3.3.2. AC/HP Airflow
NOTE : For Geothermal Heat Pumps, this option will be shown as ’Geo HP’
airflow. This option elects the airflow of the furnace when cooling, heat pump
heating, and dehumidification when used with a geothermal heat pump.
The
QUIET
airflow means the minimum cooling airflow that the system can safely
run (typically 300 CFM/ton). Use this setting if duct noise is a severe problem.
NOTE
: Duct sweating in high humidity environments could become an issue at
low airflows.
The
COMFORT airflow means airflow is varied depending on humidity and
temperature demand settings. This selection enables the full dehumidify and
comfort capabilities of the system. The EFF325 (or EFF1) airflow is a fixed airflow
used to achieve specified ratings – no dehumidification airflow reduction is
performed. This is nominally 325 CFM/ton, but will vary if a 2--stage outdoor unit
is used. The EFF350 (or EFF2) airflow is a fixed airflow used to achieve specified
ratings – no dehumidification airflow reduction is performed. This is nominally 350
CFM/ton, but will vary if a 2--stage outdoor unit is used. The MAX airflow is a
fixed 400 CFM/ton. No dehumidification airflow reduction is performed.
NOTE : For Geothermal Heat Pumps, the airflow labels have been changed from
EFF325 and EFF350 to EFF1 and EFF2, respectively. Nominal geothermal system
airflows for these settings tend to be different than the typical 325 and 350 CFM/ton
values.
The dehumidify airflow, when set to
NORMAL , the airflow is allowed to adjust to
a minimum to satisfy the dehumidification call. When set to HIGH , the minimum
airflow during the dehumidify mode is increased to reduce duct and register
sweating. Also the airflow increases minimum airflow during normal cooling
operation to help reduce duct sweating.