Carrier 50XZ024 Installation, Start-Up And Service Instructions Manual Download

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(4.) AC/HP CFM ADJUST-Select NOM (Lo for 060).

(5.) ON/OFF DELAY-Select ENH profile.

(6.) CONTINUOUS FAN-Select desired fan speed when

thermostat is set to continuous fan.

(7.) DEHUMIDIFY MODE-Remove J1 jumper to activate.

(8.) LOW VOLTAGE CONNECTIONS-Make connec-

tions as shown in ELECTRICAL CONNECTIONS
section.

(9.) CONFIGURE THERMIDISTAT™ (or capable zoning

system)-Following its installation instructions for Su-
per Dehumidify and Super Comfort Heat operation.

This configuration provides the following comfort enhance-
ments:

(a.) A 30 sec blower on delay with 150 sec at 70

percent airflow to allow the indoor coil to warm
up or cool down before the blower is asked to
deliver 100 percent airflow reducing the cold blow
sensation at start up in heating and allowing the
indoor coil to more quickly reach wet coil oper-
ating conditions in cooling.

(b.) A no blower off delay eliminates cold blow which

may be associated with running the blower after
shut down of the compressor and avoids re-
evaporation

condensed

moisture

after

cooling/dehumidifying operation.

(c.) Lower airflow while the compressor is running to

reduce draft effects and increase heating air tem-
perature and improved humidity control during
cooling operation.

ACCESSORY INSTALLATION

a. ACCESSORY ELECTRIC HEATERS

Electric heaters may be installed with the 50XZ units per
instructions supplied with electric heater package. See unit
rating plate for factory-approved electric heater kits.

b. 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. 20).
During Super dehumidify mode, the G signal is not present
and the auxiliary terminals are not energized. If the
installation includes the use of the operating mode, do not
use these terminals to control accessories. See Electronic
Air Cleaner and Humidifier sections for further informa-
tion.

c. 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
P/N KEAAC0101AAA. The airflow sensor turns on elec-
tronic air cleaner when the blower is operating.

d. 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.
20–22). These terminals are energized with 24-v. when G
thermostat signal is present. (See Fig. 20–22). Alternately,
the 24-v. signal may be sourced from the W and C circuit
board connections. 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.

e. DEHUMIDIFY CAPABILITY WITH STANDARD

HUMIDISTAT CONNECTION

Latent capacities for these units are better than average
systems. If increased latent capacity is an application
requirement, the circuit board provides connection termi-
nals 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

Fig. 19—Transformer Label

C99058

TRANSFORMER CONTAINS A MANUAL
RESET OVERCURRENT PROTECTOR

IT WILL NOT AUTOMATICALLY RESET

DISCONNECT POWER AND INSTALL
LOCKOUT TAG PRIOR TO SERVICING

THIS COMPARTMENT MUST BE CLOSED
EXCEPT WHEN SERVICING

Fig. 20—Detail of SPP Printed-Circuit Board

C01033

EASY SELECT

HEATER/MOTOR

AUX HEAT KW/CFM

0-30