American Standard ACONT402AN32DA Manual del instalador - Página 14
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Features
BK Output
With the BK Output enabled (the factory default) the
Comfort Control sends a Pulse Width Modulated (PWM)
signal to Variable Speed indoor units for directly
controlling the indoor air flow between 35% and 100%.
With the BK Output enabled, the following features
are available:
•
Simplified control wiring for two step and two
stage equipment
•
Cooling Efficiency Booster for single stage
equipment (ISU Step 40)
•
User selectable Continuous Fan air flow rate
•
A wider selection of turn-on and turn-off delay
profiles selectable from the Comfort Control (ISU
Steps 12 & 13)
•
Warm Air Discharge mode for heat pump heating
(ISU Step 15)
•
Reduced air flow during Cooling Droop
•
Enhanced humidity removal when using a
humidistat connected to the Comfort Control (ISU
Step 37)
•
Variable air flow control for Wet Heat heating
applications
•
Installer selectable first stage compressor air flow
(ISU Step 14)
When the BK Output is used, the 350/400/450 cfm/ton
setting on the variable speed indoor unit still applies for
determining the final air flow.
NOTE: In order to use the BK Output, the R to BK jumper
must be cut or removed, the indoor unit dip switches 5 & 6
should be set to the OFF position, the "Y" terminals on the
indoor unit are NOT connected, and a BK wire must be
added from the Comfort Control to the Variable Speed
indoor unit.
When the BK Output is disabled, there is not a PWM
signal from the Comfort Control, and standard 24V
connections are made to the Y1 and Y2 terminals of the
indoor unit for determining the indoor air flow.
Adjustable Continuous Air flow – BK Enabled
The Continuous Fan air flow is user adjustable from 35%
to 100% in 5% increments either by entering User Setup
Mode or by holding down the Fan key for a few seconds
(Quick Setup).
Heat Pump Warm Air Discharge - BK Enabled
The indoor air flow is reduced to 77% for each compressor
heating stage for delivery of warmer discharge air.
Aggressive Recovery
The 10 minute delay between compressor stages and
between the highest compressor stage and the first stage of
auxiliary heat is defeated when there is a setpoint change
resulting in a temperature error of 2 degrees or more. ISU
Step 35 is for both heating and cooling, and overrides ISU
Step 45 when enabled.
14
Installer's Guide
Cooling Efficiency Booster - (Single Stage Compressor
Only) - BK Enabled
The indoor air flow is reduced to 80% at outdoor
temperatures below 87°F in cooling mode. The outdoor
temperature sensor must be installed and enabled in ISU
Step 10.
Control Response Rate
A set of higher gain Proportion-Integral control constants
can be chosen to increase the responsiveness of the
temperature control performance.
Cycle Rate
The selected number of system cycles per hour. If the cycle
rate were set to 3, each cycle would be 20 minutes long
when operating at a 50% load value. The total ON and/or
OFF times depends on actual indoor space load. A shorter
cycle rate (more cycles per hour) may be desired for Heating
in order to maintain a tighter control on indoor setpoint. A
longer cycle rate may be desirable for Cooling so the
system has the opportunity to remove moisture from the
air and improve indoor comfort.
Auto Changeover
When the system mode is set to AUTO, the control
automatically switches between heating and cooling modes
to maintain the desired comfort level.
Setpoint Deadband
The number of degrees separating Heating and Cooling
setpoints. The amount of separation between mode
setpoints is user defined between 2 and 10 degrees. When
the control is set to AUTO, and the cooling setpoint is
changed to a cooler setting, the heating setpoint also
changes to maintain the selected degrees separation. The
same action occurs when the heating setpoint is changed to
a warmer temperature.
Backlit Display & Keys
The liquid crystal display and the keypad will illuminate
whenever a keypad button is pressed to improve control
visibility. The back light stays on for 20 seconds after the
last key press.
Cooling Droop
Cooling Droop is an automatic function that cycles the
compressor on to improve indoor comfort by removing
moisture from the air. The Droop cycle is activated when
the room temperature is at or below the cooling setpoint.
When this function is active, the control will control
temperature at 1 or 2 degrees below cooling setpoint. The
Droop cycle is deactivated when the temperature rises
above the cooling setpoint. When the BK output is
enabled, the air flow is reduced to 80% during cooling droop
operation.
Energy Savings $
The Energy Savings mode provides energy savings by
offsetting the indoor setpoint to a cooler temperature
setting for heating and a warmer temperature setting for
cooling.
Pub. No. 11-HD03D3-3