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- 3 -
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 power 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 touch pad has LEDs that
correspond to fan operation and to indicate unit
status. The LEDs next to the ON/OFF, FAN, COOL,
and HEAT selections indicate which operational
mode is active.
•
High Pressure Protection - The unit shuts 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 falls back below 551
psi. This protection can effectively avoid bursting and
leakage of pipes, lessen system failures and prolong
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 restarting.
•
Standard Physical Dimensions - The EZ42 and EZDR
series PTAC’s both have the same dimensions (42" wide x
16" high x 13-3/4" deep).
•
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 provides many 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
output is not sufficient to maintain selected room
temperature.
•
High-Temperature Heat Pump Operation
Protection - Automatically protects the compressor if the
heat pump is operated with high indoor coil
temperatures. Power to the outdoor fan and the
compressor are turned off if the indoor coil gets too hot
during heat pump operation to prevent damage to the
compressor.
AUTO
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