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System Protection
8.0 ACTIVE SYSTEM PROTECTION FEATURES
8.11 Over and Under
Voltage
If the supply voltage or internal DC voltage is not
within an acceptable operating range, the inverter
will shut the compressor off until the voltage returns
to an acceptable level.
8.12 Inverter Over
Temperature
If the internal inverter temperature sensors detect
excessive temperatures within the inverter, the
inverter will reduce the speed of the compressor or
shut the compressor down until the temperatures
drop to an acceptable level. The compressor will be
locked out if there are 3 faults within a single call for
operation.
8.13 Controls and
Communication
Malfunction
If the controls senses a malfunction within the
control system or communications or if system
model data is not available, the controls will act
to shut the system down to prevent the system
from operating at a condition that could harm
components.
8.14 Sensor Failure Default Operation
If the controls sense an externally connected
sensor has failed, the system will enter a fail safe
operating mode and will continue to condition the
space until the sensor can be replaced. A fault
code will be displayed on the EcoNet
TM
Control
Center and Variable Speed Outdoor Control
identifying which sensor has failed. See the table
below for the default operation for a sensor failure.
FAILED
COMPONENT
FUNCTION
DEFAULT OPERATION
Outdoor Sensor
(OAT)
Low Ambient Cooling
No Low Ambient Function
One minute fan off delay on
COOL mode
No delay functions if failure is
open or short. Continue function
for a thermistor range error.
PWM Shift above 104
o
F [40
o
C]
Shift will not occur
Coil Sensor
(EVAPIN)
Low Ambient Cooling
No function
Suction Sensor
(OST)
Suction Temperature
Measurement
No Suction Temperature
Measurement
Compressor
Sump Sensor
(CPT)
AEM Lubrication Protection, Oil
Circulating Ration
Protection, Compressor Stator
Heat
The compressor operation
outlined in the applicable
section will be performed once
an hour. The compressor stator
heat will be kept from operating.
8.15 Exiting Active Protection Lock-Out Mode
Exiting an Active Protection Lock-Out mode can be
accomplished by disconnecting electrical power to both
the indoor and outdoor units for 1 minute and then
restoring power. Keep in mind there was a reason for
the lock-out, so the fault code on
the Variable Speed Outdoor Control (VSODC) or
EcoNet
TM
Control Center should be read to assist
with diagnosing the root cause of the lock-out and
corrective action should be taken to prevent the
system from repeating the lock-out.
