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4 Startup Control
4.1 Compressor Startup Delay Control
When the ODU is powered on again and the compressor delays about 7 minutes to start. A er the compressor stops running,
it takes about 4 minutes to restart, in order to prevent frequent compressor on/off and to equalize the pressure within the
refrigerant system.
4.2 Startup Control for Cooling Opera on
Table 3-4.1: Component control during startup in cooling mode
Component
Inverter compressor
DC fan motor
Electronic expansion valve
Four-way valve
4.3 Startup Control for Hea ng Opera on
Table 3-4.2: Component control during startup in hea ng mode
Component
Inverter compressor
DC fan motor
Electronic expansion valve
Four-way valve
Wiring
28-56 model
diagram label
•
COMP
•
FAN
•
EEV
•
ST1
Wiring
28-56 model
diagram label
•
COMP
•
FAN
•
EEV
•
ST1
Control func ons and states
Controlled according to load requirement, opera ng
frequency increased by 1 step / sec
The outdoor unit fan start by 7 gears for 20 seconds before
compressor start, and then maintain the fan speed for
another 20 seconds when compressor start, finally the fan
speed controlled according to heat exchanger temperature
(T3),
outdoor
ambient
temperature (T5)and compressor frequency.
Maintain 304(step) for 3 minutes before compressor startup，
then controlled according to discharge temperature
Off
Control func ons and states
Controlled according to load requirement, opera ng
frequency increased by 1 step / sec
The outdoor unit fan start by 7 gears for 20 seconds before
compressor startup, and then maintain the fan speed for
another 20 seconds when compressor start, finally the fan
speed controlled according to heat exchanger temperature
(T3), outdoor ambient temperature (T4) and compressor
frequency.
Maintain 304(step) for 3 minutes before compressor startup，
then controlled according to discharge temperature
On
temperature
(T4)
,discharge
21
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