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1.Temperature parameters
Indoor ambient temperature (Tinner ambient)
Indoor setting temperature (Tset)
2.System first power on
After electrified, the side valve will be powered on, each electron expansion valve will be turned off orderly, then side valve will be powered off,
all the electron expansion valve should be turned to a certain angle, the unit on is standby.
Under each modes, once the compressor starts up, at least running for 7mins the unit will stop (not including
malfunction protection, modes switch the compressor needed to stop running);
Once compressor stopped, the unit will start up after 3mins delay (Heating oil return or defrosting except).
2.1 Cooling mode
Working condition and procedure of cooling running
If compressor stopped and turn on the unit for cooling, if any one indoor unit (Tindoor amb. Tpreset) 0.5
at this time, the outdoor fan motor, compressor starts to run, the compressor frequency will run at the capacity requirement calculated.
2.1.2 Unit will stop for cooling
(1) Compressor will stop running
Compressor will stop running right away, outdoor fan motor will delay 1min and will stop running, all the electron expansion valve starts to work, when
turns off all valves at OP, the side valve will be electrified, the valve fully turns to 480P, the side valve will turn off.
(2) Part of indoor unit arrive at unit stop running condition (Compressor will not stop)
Compressor will run according to capacity requirement calculated frequency, when capacity requirement is 0 indoor unit corresponding electron
expansion valve 5s turns off, compressor frequency variable start meanwhile running indoor unit (no matter it is newly opened or indoor unit
has been run) the corresponding electron expansion valve resumes to the original value.
NOTE: Unit off, Fan, Protection as the same with Cool mode;
2.1.3 Switching from cooling mode to heating mode
When turning to heating mode, after compressor stopped, 4-way valve will electrify after 2mins delay, the others are the same with cooling.
2.1.4 4-way valve control
Under this mode, 4-way valve will close (that is not electrified).
Outdoor unit fan motor control under cooling mode
Before compressor start 5s start cooling, after outdoor fan motor start up and run in high speed for 3min, then according to the indoor unit rated capacity
total amount and outdoor ambient temperature, automatically select High, Mid, Low three fan speeds.
Other control: When the newly opened indoor unit is running, outdoor fan motor will run at high fan speed for 40s, then according to control logic to
adjust. Fan motor each grade at least run 80s (when indoor unit running quantities change and calculate indoor unit rated capacity total amount
and according to temperature to adjust the fan speed.) When compressor stops running, outdoor fan will run at
When cooling oil return, after compressor frequency rise up to 70Hz, it will stayabily run; Outdoor fan motor will accord to indoor unit will run at current
fan speed and after 1min delay to stop.
Cooling oil return condition
rating capacity total capacity and temperature automatically adjust the fan speed.
The oil return lasting time of cooling will be 5min. (including frequency rising time), oil return will be completed.
Anti-freezing protection
When it is satisfied with anti-freezing protection, the system will enter into anti-freezing protection, at this time only some of the indoor unit anti-freezing
protection, indoor capacity will be set as 0; when all running indoor unit act the anti-freezing protection, the unit will process as Cool mode. When it is
satisfied with the anti-freezing protection finished, the anti-freezing protection will be finished.
Dehumidify mode
Working condition and procedure of dehumidifying: the same with Cool mode; Protection function: the same with Cool mode. Close up 4-way
valve. The single unit capacity requirement percent of dehumidifying mode max. value is the cooling mode 90%, outdoor fan motor, compressor
start up condition is the same with that in Cool mode.
Heating mode
Working condition and procedure of heating running
When any one of indoor unit Tindoor amb
Unit will stop for heating
All indoor units arrived at unit off or unit stop condition: compressor will stop, outdoor fan unit will delay 1min will stop, all the elctrictron expansion
valve will start to work, when all valves turn to OP adjustment, the side valve will electrified, when turn the valve to 480P, the side valve will not
electrified.
Tpreset
2.5
, will start heating mode (turns on the heating and arrive at the unit on temperature)
, that the cooling will run;
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