• High Pressure Protection The unit will shut off
automatically when the pressure in the system is over
638 psi and within 10 minutes, after the compressor
turns off, the unit will restart when the pressure turns
back below 551 psi. This protection can effectively
avoid the burst and leakage of pipes, lessen the
system failures and prolong the service life.
• Failure Tolerance If the unit is in protection mode
less than 4 times in one hour, the accumulation times
will reset to avoid system failure. Only when the unit
enters protection mode more than 4 times in one
hour, the system will fail to restart automatically and
need manual restart.
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Standard Physical Dimensions-The series PTAC
is with the same dimensions 42" wide x 16" high x 133/4" deep
Replacement of older units is made easy.
Weather-Protected Electrical Components-Vital
electrical components are protected from the weather
by locating them on the indoor side of the weather
barrier.
Highly Featured Microprocessor Controls-
Microprocessor controls are programmed to interface
with the temperature sensors to maximize comfort
conditions for the room occupant and provide
outstanding features.
Thermistors are used to sense small changes in
temperature to give excellent room control and allow
the microprocessor to monitor and react to changing
conditions.
• Automatic Emergency Heat on Heat Pump
Units-Automatically uses electric resistance heat if
the heat pump fails.
selected room temperatur .
• High-Temperature Heat Pump Operation Protection
-Automatically protects the compressor if heat pump is
operated with high indoor coil temperatures. Power to
the outdoor fan turned off if the
indoor coil gets too hot during heat pump operation to
prevent damage to the compressor.
UNIT FEATURES
This unit has many features which are different than those
found on conventional PTAC units. The servicer must be
familiar with these features in order to properly handle
the unit .
• LCDI Cords-Underwriters Laboratories and the
National Electric Code (NEC) now require power
cords that sense current leakage and can open the
electrical circuit to the unit on units rated at 250 volts
or less. In the event that unit does not operate, check
the reset button located on or near the head of the
power cord as part of the normal troubleshooting
procedure.
LCDI pow er Cord
• Automatic 3-minute compressor lockout-After
the compressor cycles off, it will not restart for three
minutes.
• Random restart delay-To help eliminate power
surges after a power outage, the unit is equipped with
a two to four minute random restart delay feature.
Whenever the unit is plugged in with the master
switch turned on and the mode switch set in the cool
or heat mode, a random restart will occur. A random
restart condition can be avoided by setting the mode
switch in the fan only or off position before applying
power to the unit.
• Indication LEDs-The control panel has LEDs that
correspond to fan operation and to indicate unit
status. The LEDs next to the selections ON/OFF,
FAN, COOL, and HEAT indicate which operational
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HEAT
COO L
FAN
ON/ OFF
AUT O
LOW
HIG H
SPEE D
FAN