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Factory-installed options
Cupronickel heat exchangers
are available for higher
corrosion protection for applications such as open tower,
geothermal, etc. Consult the water quality guidelines for
proper application and selection of this option.
Thermostat options
include a unit mounted Manual
Changeover (MCO) or Auto Changeover (ACO) thermo-
stat. The temperature set point knob and push button
switches for fan speed and cool/heat mode (MCO) selec-
tion are conveniently located on the top. The thermostat
senses the return-air temperature. The thermostat sends
the appropriate signal to the controller for cooling or heat-
ing mode of operation.
Options R and S allow connection to a remote wall-
mounted thermostat. The Complete C controller requires a
heat pump thermostat. The Deluxe D controller can be
configured for heat pump or heat/cool thermostat.
Cabinet options
include a locking control panel for
added security. A bottom or front return with left or right
hand configurations for ease of installation. Available with
3 or 5 in. subbase, with or without motorized damper.
Motorized fresh air damper
with the unit-mounted
thermostat. Opens when LOW or HIGH fan speed selec-
tions are made from the push button switches. When
STOP or FAN ONLY selections are made the spring return
on the damper motor closes the damper. With remote ther-
mostat the motorized fresh air damper opens when the fan
is running.
Piping connections
can be provided on either the right
or left hand side of the unit, for easy installation. Orienta-
tion is determined by facing the unit from the front side.
Automatic flow regulators
include internally mounted
2.5 or 3.0 gpm per ton automatic flow regulating valves
for easier install
ation.
Two-way motorized control valve
can be provided with
a copper or cupronickel heat exchanger for applications
involving open type systems or variable speed pumping.
This valve will slowly open and close in conjunction with the
compressor operation to shut off or turn on water to the
unit. Standard and high maximum operating pressure dif-
ferential (MOPD) valve options are available for maximum
installation flexibility. Standard two-way valve performance
includes Cv of 3.5 and MOPD of 20 psi. High MOPD valve
performance includes Cv of 2.5 and MOPD of 50 psi.
Deluxe D control system
provides the same functions
as the Complete C while incorporating additional flexibility
and functions to include:
Thermostat input capabilities — Accommodate emergency
shutdown mode and night setback with override (NSB)
potential. Night setback from low temperature thermostat
with 2-hour override is initiated by a momentary signal
from the thermostat.
Compressor relay staging — Used with dual stage units
(units with 2 compressors and 2 D controls) or in master/
slave applications.
Boilerless electric heat control system — Allows automatic
changeover to electric heat at low loop water temperature.
Intelligent reversing valve operation —
Minimizes reversing
valve operation for extended life and quiet operation.
Thermostat type select (Y, O or Y, W) —
Provides ability to
work and select heat pump or heat/cool thermostats (Y, W).
Reversing valve signal select (O or B) — Provides selection
for heat pump O/B thermostats.
Dehumidistat input —
Provides operation of fan control for
dehumidification operation.
Multiple units on one thermostat/wall sensor —
Provides
for communication for up to three heat pumps on one
thermostat.
Boilerless changeover temperature — Provides selection of
boilerless changeover temperature set point.
Accessory relays — Allow configuration for multiple appli-
cations including fan and compressor cycling, digital night
setback (NSB), mechanical night setback, water valve oper-
ation, and outside air damper operation.
Night low limit
— If the unit operation is turned OFF from
either the push button switches, remote thermostat or the
energy management system, it is possible that the space
temperature could drop uncontrollably. The Night Low
Limit feature, with Deluxe D controller, helps maintain the
space temperature at a level that is the best compromise
between energy consumption and a safe space tempera-
ture. A thermostat located near the return air filter
activates the blower and compressor operation when the
space temperature falls below 50 F. When return air tem-
perature is raised above 55 F the compressor and blower
stop.
Override function — An Override function is available for
units operating in occupied/unoccupied mode under the
control of an external timeclock or an energy management
system. A contact closure from the timeclock or energy
management system shorts the NSB and C terminal on the
Deluxe D controller signaling an unoccupied mode.
For units with the unit-mounted thermostat, pressing
override switch (located under control access door) will
override the unoccupied mode and allow the occupied
mode of operation to continue for a period of two hours.
The units with the remote wall-mounted thermostat
require a digital thermostat with the override function. In
unoccupied mode an accessory relay is energized on the
Deluxe D controller. The NO/NC contacts of the relay can
be used as appropriate input to the digital thermostat to
signal occupied/unoccupied mode. The thermostat selects
cooling/heating set points based on occupied/unoccupied
mode.
PremierLink™ controller
is compatible with the Carrier
Comfort Network (CCN) and other building automation
systems (BAS). This control is designed to allow users the
access and ability to change factory-defined settings thus
expanding the function of the standard unit.
Options and accessories
