Vivax ACP-18CH50GEI, Service Manual

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1 Temperature Parameters
Controller Function of Outdoor Unit
1 .1 Cooling Mode
1 .1.1 Working Conditions and Process of Cooling
If the compressor is in off status,and (T
in-amb.
-T
preset
) 0.5 , start the unit in cooling mode,in which case,outdoor fan
and compressor start running,and microcomputer will auto adjust the frequency of compressor by cooling capacity requirements.
In cooling running,if 0 (T
preset
-T
in-amb.
) 2 ,the compressor will run at low frequency.
In cooling running,if capacity requirements is 0( unit stop for cooling ),and (T
preset
-T
in-amb
.) 2 ,the compressor will stop,
and outdoor fan will stop running in 60S.
In this mode, switch valve is de-energized,and the temp. can be set in the range of 16-30 .
1.1.2 Antifreeze Protection
with frequency decline ,and outdoor fan will bestopped in 60S. When antifreeze protection is releasedthe unit will resume its
original operating status.
In cooling or dehumidify mode,if it is detected that the system is under antifreeze protection, the compressor will stop or run
1.2 Dehumidifying Mode
1 .2.1 Working Conditions and Process of Dehumidifying
Same with Cooling Mode
In this mode, switch valve is de-energized,and the temp. can be set in the range of 16-30
1.2.2 Protection is same with Cooling mode
1.3 Fan Mode
Compressor, outdoor fan and 4-way valve shut off.
Temp. setting range:16-30 .
1.4 Heating Mode
1.4.1 Working Conditions and Process of Heating
If Tamb 3 Tpreset 0.5 , the unit will start heating, in which case, compressor, outdoor fan and 4-way will run.
If Tamb 3 Tpreset 2 , the compressor will run at 30Hz.
If Tamb 3 Tpreset 2 , the compressor will stop running and outdoor fan will stop running after 1min delay.
Stop the unit or switch into other modes in heating mode, the 4-way valve will de-energize after the compressor has
stopped for 2min.
In this mode, the Temp. setting range should be 16-30 .
1.4.2 Defrosting Process
2 .1 Overload pretection
When Ttube is detected too high, the compressor will run in limited or dropped frequency.When Ttube goes on rising over the stated value,
the compressor will stop.If Ttube resumes normal, so does the complete unit according to capacity requirements.
If 6 successive times ofoverload protection happens,the compressor won't resume running except pressing ON/OFFbutton.
In running process,if the comprssor has runfor 7 min,the times of overload protection will be cleared.
2 .2 Delay pretection for compressor
Once be stopped, the compressor can not be restarted within 3mins.
2 .3 Exhaust Temperature Pr o tection
If it is detected by the outdoor controller that the exhaust temperature is too high, the compressor will run in limited or dropped frequency.
If the exhaust temperature goes on rising over the stated value, the compressor will stop and it is detected that the exhaust temperature
has resumed normal, the compressor will resume running according to capacity requirements.
If 6 successive times ofoverload protection happens,the compressor won't resume running except pressing ON/OFFbutton.
In running process,if the comprssor has runfor 7 min,the times of overload protection will be cleared.
2 .4 Current Protection Function
2.4. 1.Overload protection
2 .Current Protection Function in Cooling/Heating/Dehumidifying Mode
Outdoor microcomputer system will accord to the frost on evaporator, outdoor tube temp sensor to judge whether it enters
defrosting process. If satisfied the defrosting process, compressor will stop, 4-way valve reversal; Compressor runs at high
frequency running, indoor fan will run by blowing exhaust heat.