Startup Control - Sinclair SDV5 Series Service Manual

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. After 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 Operation
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 Heating Operation
Table 3-4.2: Component control during startup in heating mode
Component
Inverter compressor
DC fan motor
Electronic expansion valve
Four-way valve
20
Wiring
8~16kW
diagram label
COMP
●
FAN ●
EEV ●
ST1 ●
Wiring
8~16kW
diagram label
COMP
●
FAN ●
EEV ●
ST1 ●
Control functions and states
Controlled according to
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 (T4) ,discharge temperature
(T5)and compressor frequency.
Maintain 304(step) for 3 minutes before compressor startup，
then controlled according to discharge temperature
Off
Control functions and states
Controlled according to
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
load requirement, operating
load requirement, operating