9
Indoor units — field-installed accessories
Two-row hot water coils
have
5
/
8
-in. diameter copper
tubes mechanically bonded to aluminum plate fins. Coils
have non-ferrous headers.
One-row steam coil
has 1-in. OD copper tube and
aluminum fins. The Inner Distributing Tube (IDT) design
provides uniform temperatures across the coil face. The
steam coil has a broad operating pressure range; up to
175 psig at 400 F and up to 300 psig at 300 F. IDT steam
coils are especially suited to applications where sub-
freezing air enters the unit.
Electric resistance heat coils
have a one- or two-stage,
open-wire design and are mounted in a rigid frame. Safety
cutouts for high temperature conditions are standard.
Accessory features single point power wire connection.
Economizer (enthalpy controlled)
provides ventilation
air and “free” cooling if outside ambient temperature and
humidity are suitable. Can also be used in conjunction with
Carrier Comfort System thermostats and CO
2
sensors to
help meet indoor air quality requirements.
Discharge plenum
directs the air discharge directly into
the occupied space; integral horizontal and vertical louvers
enable redirection of airflow. Accessory is available
unpainted or painted. Field assembly required.
Return-air grille
provides a protective barrier over the
return-air opening and gives a finished appearance to units
installed in the occupied space. Accessory is available
unpainted or painted.
Subbase
provides a stable, raised platform and room for
condensate drain connection for floor-mounted units.
Accessory is available unpainted or painted.
Overhead suspension package
includes necessary
brackets to support units in horizontal ceiling installations.
Carrier’s line of thermostats
provide both programma-
ble and non-programmable capability with the new
Debonair™
line of commercial programmable thermo-
stats, the
TEMP System
controls offer communication
capability with staged heating and cooling, the
Commer-
cial Electronic
thermostats provide 7-day programmable
capability for economical applications, while the
non-
programmable
thermostats offer a multitude of staged
heating and cooling subbase options.
CO
2
sensors
can be used in conjunction with the econo-
mizer accessory to help meet indoor air quality require-
ments. The sensor signals the economizer to open when
the CO
2
level in the space exceeds the set point. A Carrier
Comfort System programmable thermostat can also be
used to override the sensor if the outside air temperature is
too high or too low.
Condensate drain trap
includes an overflow shutoff
switch than can be wired to turn off the unit if the trap
becomes plugged. Kit also includes a wire harness that can
be connected to an alarm if desired. The transparent trap
is designed for easy service and maintenance.
