Bryant 574B Installation Instructions Manual page 13

h. BASIC UNIT CONFIGURATION
The following basic configuration of the indoor motor
will provide ARI rated performance of the 574B. This
BASIC CONFIGURATION should be used when the
rated ARI performance is required, or if system
enhancements such as super dehumidify are not
needed.
(1.) HEAT- -Factory selected to match heat input size.
(2.) AC/HP Size- -Factory selected to match system
size, please verify.
(3.) SYSTEM TYPE- -Factory selected on 574B
system AC- -AIR CONDITIONER.
(4.) AC/HP CFM ADJUST- -Select NOM.
(5.) ON/OFF DELAY- -Factory selected 0/90 profile.
(Do Not Use ENH profile for Gas Packaged
Units)
(6.) CONTINUOUS FAN- -Select desired fan speed
when thermostat is set to continuous fan.
i. COMFORT OPTIONS SUPER DEHUMIDIFY (See
Quick Reference Guide)
The Super Dehumidify option is possible when this
unit is installed with a field supplied Thermidistatt
control (SuperDehumidify does not require an outdoor
temperature sensor). The following configuration is
recommended for maximum cooling/dehumidifying
comfort. This configuration will improve the comfort
provided by the air conditioning system if more
humidity removal is desired. While providing this
improved comfort, the system will operate efficiently,
but not at the published ARI SEER efficiency. During
cool- -to- -dehumidify call, it provides maximum
dehumidification by reducing airflow to a minimum.
The actual super dehumidify command from
Thermidistat control to the indoor unit is a "Y" signal
without a "G" signal in addition to dehumidify signal.
The indoor unit responds to this combination by
reducing the airflow to a minimum. All other
characteristics of cool to dehumidify are the same. The
following system configuration is recommended for
maximum cooling/dehumidifying comfort (See Fig.
12).
(1.) HEAT- -Factory selected to match gas heat size of
unit installed.
(2.) AC/HP Size- -Factory selected to match system
size, please verify.
(3.) SYSTEM TYPE- -Factory selected on 574B
system AC- -AIR CONDITIONER.
(4.) AC/HP CFM ADJUST- -Select NOM.
(5.) ON/OFF DELAY- -Select "0/0" profile.
(6.) CONTINUOUS FAN- -Select desired fan speed
when thermostat is set to continuous fan.
(7.) DEHUMIDIFY MODE- -Remove J1 jumper to
activate.
NOTE: J1 jumper should only be removed when a Thermidistat,
humidistat or capable zoning control is installed.
(8.) LOW VOLTAGE CONNECTIONS- -Make
connections as shown in ELECTRICAL
CONNECTIONS section.
(9.) CONFIGURE THERMIDISTAT- -Follow
Thermidistat (or capable zoning system)
installation instructions for Super Dehumidify
operation.
ACCESSORY INSTALLATION
a. AUXILIARY TERMINALS The AUX and HUM
terminals on the Easy Select Board are tied directly to
the G terminal, and provide a 24- -v. signal whenever
the G terminal is energized (See Fig. 12). During
Super dehumidify mode, the G signal is not present
and the auxiliary terminals are not energized. If the
installation includes the use of this operating mode, do
not use these terminals to control accessories. See
Electronic Air Cleaner and Humidifier sections for
further information.
b. ELECTRONIC AIR CLEANER CONNECTIONS
The AUX1 and AUX2 terminals are not always
energized during blower operations, as described
above. When using an electronic air cleaner with the
unit, use Airflow Sensor (See Air Cleaner Price Pages
for Part Number). The airflow sensor turns on
electronic air cleaner when the blower is operating.
c. HUMIDIFIER/HUMIDISTAT CONNECTIONS Easy
Select Board terminals HUM1 and HUM2 are
provided for direct connection to the low- -voltage
control of a humidifier through a standard humidistat
(See Fig. 12). These terminals are energized with 24- -v.
when G thermostat signal is present (See Fig. 13 &
14). Alternately, the 24- -v. signal may be sourced from
the W and C on the 9 pin connector. When using a
Thermidistat Control, Zone Comfort Plus or Comfort
Zone II, the 24- -v. signal may be sourced directly from
the Thermidistat HUM terminal (See Fig. 12, 13 &
14).
d. DEHUMIDIFY CAPABILITY WITH STANDARD
HUMIDISTAT CONNECTION
Latent capacities for this unit are better than average
systems. If increased latent capacity is an application
requirement, the ECM board provides connection
terminals for use of a standard humidistat. The unit
will detect the humidistat contacts opening on
increasing humidity and reduce its airflow to
approximately 80 percent of nominal cooling mode
airflow. This reduction will increase the system latent
capacity until the humidity falls to a level which
causes the humidistat to close its contacts. When the
contacts close, the airflow will return to 100 percent of
selected cooling airflow. To activate this mode, remove
jumper J1 and wire in a standard humidistat (See Fig.
14).
e. DEHUMIDIFY AND SUPER DEHUMIDIFY
CAPABILITIES
This model unit is capable of responding to a signal
from indoor system control (Thermidistat or capable
zoning control) to operate in comfort control modes
such as Super Dehumidify Mode. Consult literature
provided with indoor system control to determine if
these operating modes are available, and to see control
set up instructions. No special setup or wiring of unit
is required.
HUMIDISTAT
HUM 1
(C)
24-VAC
HUM 2
(G)
Fig. 13 - - Humidifier Wiring - - 574B
13
TO HUMIDIFIER
HUMIDIFIER WIRING
A95317