- 2-
UNIT FEATURES
This unit has many features which are different from those
found on conventional PTAC units. The operator must be
familiar with these features in order to properly handle the
unit
.
• DC-inverter compressor
-
Manufactured by
HEAT
COOL
FAN
SPEED
HIGH
LOW
AUTO
MITSHUBISH, due to its higher efficiency, energy
saving up can be up to 30% to 80%. Operation
voltage range is wider from 160VAC~270VAC, make
sure unit operation more stable under wide voltage
range power input. For its soft start feature, power
surge can be avoided, and also lower the noise level.
Without frequently start-stop makes the room
temperature more stable, so more comfortable.
• High performance IPM
-
Containing PFC module,
under heavy loading, PF can be up to 99%, thus
decreases EMI pollution to power supply system, and
also decreases power surge. Compressor driver chip
is manufactured by FAIRCHILD, famous brand and
high performance, making the compressor running
more reliable and more stable.
• 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 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
mode is active.
FAN
ON
/
OFF
• System safety protections
-
To ensure the system
running safely, electric control has the following
protections, for problem solving, please refer to
d i a g n o s t i c c o d e s & s o l u t i o n s
a n d
troubleshooting
sections.
A
)
Outdoor unit overload protection in COOLING
mode
When condenser coil temperature exceeds the
presetting point, compressor decreases the operating
frequency to 30Hz. If this protection is inactive and
condenser coil temperature reaches the shut
-
down
point, compressor will be turned off. Thus unit provide
double protections.
B) Evaporator over cold protection (will not
display error code)
When evaporator coil temperature drops to 1
℃
and
lasts for 5 minutes, compressor and outdoor fan will
stop, indoor fan keeps on running.
C
)
Compressor discharge over heat protection
When compressor discharge temperature reaches
protection point, compressor will decrease operating
frequency to 30Hz. If this protection is inactive and
discharge temperature reaches the shut down point,
compressor will be turned off. Thus provide double
protections.
D) Evaporator overload protection in HEAT PUMP
mode
When evaporator coil temperature exceeds the
presetting point, compressor decreases the operating
frequency to 30Hz. If this protection is inactive and
evaporator coil temperature reaches the shut down
point, compressor will be turned off. Thus provide
double protections. This time the back up electric
heater will be turned on.
E) Input over current protection
When input current exceeds the presetting point,
compressor will decrease the operating frequency to
30Hz. If this protection is inactive and current reaches
the shut down point, compressor will be turned off.
F) Compressor over current protection
When compressor operating current exceeds the shut
down point, compressor will be shut down.
G) IPM fault protection
When IPM faults, include over heat, unit will be shut
down, all outputs are terminated, control panel
displays the error code.
H) Temperature sensor fault protection
Any temperature sensor faults, unit stops and display
the error code.
I) Communication fault protection
For continuously 2 minutes communication faults
between indoor unit and outdoor unit, unit will
shut down and displays error code.
