31
Operation
Item Number Component Feature
1 Input Power
2 DLT
3 HPC
4 RS485 Communication
5 Fan Motor
6 Compressor
Table 13: Features on the Power Inverter
Compressor Control
Figure 31: Power Inverter Compressor Control Diagram
7.1.2 Factory Superheat Setting
The UODC is pre-programmed with the optimum
superheat setting of 10º for each outdoor unit.
7.2 Power Inverter Compressor
Control
(-)A18AZ/(-)P18AZ outdoor units are equipped with a
power inverter that varies the compressor speed to
match the changing capacity needs of the conditioned
space. The inverter interfaces with the Universal
Outdoor Control (UODC) which communicates the
level of system capacity that is required to the inverter
based on input from the EcoNet
TM
Control Center or
conventional 24VAC 2-stage thermostat. The inverter
converts incoming single phase power to simulated
variable frequency 3-phase power that is connected
to the 3-phase compressor motor. Each of the four (-)
A18AZ/(-)P18AZ models has a unique inverter specifically
designed and qualified for that specific model to
provide reliable operation under the most extreme
conditions. Each inverter is programmed to monitor
compressor power consumption, motor torque,
input current, input voltage, compressor discharge
pressure, and compressor discharge temperature.
When the inverter identifies a condition that could
potentially result in compressor or inverter damage,
it automatically reduces the compressor speed until
a more reliable operating condition is obtained or
shuts the compressor completely off if necessary.
Once safe operating conditions are attained, the
inverter will gradually increase the compressor
speed in an attempt to meet the capacity demand
as long as the operating conditions remain within
the safe operating range of the compressor and
inverter.
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