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4
UNIT FEATURES
Fig. 2 – Model 52M
This Premium unit has many exciting features which
are different than those found on standard PTAC
models. The owner must be familiar with these
features in order t o fully understand the operation and
capability of the unit.
• Intelligence – Your P remium unit has an on board
computerthat utilizes real timediagnosticstoprolong
the life of your unit. There is an LED indicator on the
control board, behind the front panel, that will flash
an error code if the unit has detected some kind of
fault condition. In many cases, the unit will
automatically clear the fault condition and continue
operating with no interruption. In some cases, the
condition cannot be cleared and the unit will require
servi ce. In th os e cas es , an “Fx” fai lu re m o de wi ll be
displayed on the digital display. For a detailed list of
all error codes and “Fx” conditions, see Table 6 --
Status LED Indicator Definitions for further details.
• Memory – Your Premium unit also has memory. If
power is lost, all of the control settings (setpoint,
mode, fan speed, on/off and configuration) are
remembered. So when power is restored, the unit will
start back up in the mode (and configuration) it was
in, when power was lost.
• Premium Sound – Your Premium unit is also
Carrier’s quietest PTAC ever. Not only does it have 2
fan m otors and a tangential blower wheel for
optimum sound, the indoor fan will always run a
minimum of 10 seconds before the compressor, to
help reduce any compressor starting noise.
• Random Compressor restart -- To help prevent
power s urges after a power out ag e (from man y of
your PTACs starting at the same time), the
compressor is equipped with a 2:45 to 3:15 random
restart delay feature. Whenever the unit is plugged in,
or power has been restarted, a random compressor
rest art wi l l occur.
• Compressor Protection -- To prevent short cycling
of the compressor and maximize it’s life, there is a
random start--up delay of 3 minutes on the
compressor and a minimum compressor run time of 3
minutes.
• Automati c room freeze p rotection –automatically
will keep the temperature in the room from getting
too co l d, where water pip es m i gh t freeze. If t he un i t
is co nfi g u red for t he freeze pro t ecti o n feat u re to b e
active(which is the default condition), then whenever
power is supplied to the unit, if the unit senses
tem perat u re bel o w 40°F, t h e fan mot o r and el ect ri c
heater are turned on and will warm the room to 50_F.
If F r eeze protect i on is not requ i red, ch ang e the
configuration switch to turn the feature off (see
section on unit configuration).
• Au toma ti c defrost protection (for h eat pump
models only) – When the outdoor temperature gets
too cold (approx. 35°F) and the unit can no longer
effectively heat with the compressor, the unit will
automatically switch t o electric heating. Theunit will
then heat wi t h elect ri c heat unt i l th e out s i de
temperature rises enough (approx. 40°F), so the
comp res s or can b e us ed agai n .
• Au to mati c Quick Wa rm --u p (for hea t p u mp
models only) -- If the room temperature falls to 5°F
belo w t he set p oi n t t em perat u re, th e r evers e cycl e
heat is shut off and the electric strip heat is turned on
for one cycl e, unti l heatin g i s s at i sfi ed .
• LED Indicator’s and Buttons -- The touch pad has
buttons for MODE, FANS P EED, ON/OFF,
SETP OINT UP and S ETPOINT DOWN. It also has
LEDs that correspond to the mode, fan speed and
setpoint operation, to indicate t he unit’s status. The
LEDs below the mode button, FAN, C OOL, and
HEAT, indicate what operating mode is active. The
LEDs below the Fan button, Low, Med and Hi,
ind i cat e th e fan sp eed t hat i s s el ect ed . Th e LED
locat ed i n t he lo wer rig h t corn er is t h e uni t On / Off
status LED. If the unit is in ON mode, the LED will
be green. If the unit is OFF, the LED will be red.
• Configure Fan to Optimize Selected Application
-- Unit can be optimized to selected application by
configuring the fan to run in continuous mode or
cycle on and off with the compressor and electric
heater (can be different for bot h heati n g an d cooli n g
modes). In cycle mode, fan will continue to run after
comp res s or or elect ri c heater s t o ps in order bl ow off
any residual heat or cool left on coil.
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