Hitachi UTOPIA RAS-4HVRP2E - Page 130

6 Optional functions
RAS-(4-6)H(V)(R/N)(C/P)2E
SMGB0136 rev.0 - 07/2021
128

Outdoor unit fan motor start/stop (Control function nº 4)
This is an auxiliary function to protect the outdoor unit from snow. When the input terminals for Outdoor Fan Motor Start/
Stop on the outdoor unit PCB1 are short-circuited during the compressor stoppage, all the outdoor fan motors start
operating. If the compressor restarts operating, the outdoor fan motors will be restored to normal operation. If the input
terminals of Outdoor Fan Motor Start/Stop are opened during the outdoor fan motor operation following the short circuit
of these terminals, the outdoor fan motor will stop. This function is possible only during the compressor stoppage (during
Switch-OFF or Thermo-OFF of the Switch-ON). Therefore, this function will not be possible even if the input signal is sent
during the normal cooling or heating operation.
? NOTE
• Thisisanauxiliaryfunctiontoprotecttheunitfromsnow.Insnowyregions,makesuretoprotecttheunitwithasnow-preventionroof,
fence(Field-Supplied)orsnow-preventionhood(optional),etc.Otherwise,abnormalvibrationsduetoimbalancedpropellerfanwill
becaused.
• Ifthefanmotororfancontrollerfailduringtheoutdoorfanmotorstart/stopoperation,stoptheoutdoorfanmotortosuspendtheopera-
tion.Checkthealarmcodeanddealproperlywiththefailurenexttimethecompressorisoperated.
• WhensettingthesnowsensorswitchforOutdoorFanMotorStart/Stop,makesurethatthecontinuousoperatingtimeis30seconds
ormore.Alsotheoutdoorfanmotorstart/stopintervalsshallbeatleast10minutes.Otherwise,malfunctionoftheoutdoorfanmotors
willbecausedbyfrequentstart/stop.
! CAUTION
Becauseofthissetting,theoutdoorfancanoperateevenwhiletheoutdoorunit(compressor)stops.Displayanoticetothateffectona
readilyvisiblepartoftheunitbody,inordertoavoidinjuriescausedbyanunintendedoutdoorfanoperation.
Setting example
Outdoor fan motor Start/Stop at Input 2 (between 2 and 3 pins of CN2)
a 3-pin connector
b Outdoor unit PCB1
c Control circuit
d Power source
X1 Auxiliary relay
SS3 Snow sensor switch

Demand current control of 40, 60, 70, 80 and 100% (Control function nº 6 to 10)
When the demand current control input terminals for the outdoor unit PCB1 are short-circuited, the compressor frequency
is controlled by the maximum current limit of the outdoor unit, which is set at 100%, 80%, 70%, 60% and 40%. If the
outdoor unit running current exceeds the maximum limit for twenty minutes, the indoor unit is put under Thermo-OFF
condition. In this case, the stoppage code Number “10” is given. When the input terminal is opened during the demand
current control, its control is released.
? NOTE
• Thermo-ON:Theoutdoorunitandsomeindoorunitsarerunning.
• Thermo-OFF:Theoutdoorunitandsomeindoorunitsstayon,butdon’trun.
• Thedemandcurrentcontrol(%)isvaluecriterion.Thevalueusedforthiscontroliscalculatedfromthecurrent,andthereforeisdif-
ferentfromthevalueindicatedbyawattmeter.Ifitisrequiredthatthemaximumpowerconsumptionismanagedprecisely,aeld-
supplieddemandcontrollershouldbeused.
• Theactualvaluemaytemporarilybehigherthantheindicatedvalue(by40%to100%)dependingontheoperatingcontrolconditions
suchasprotectioncontrol.
Setting example
Demand current control at Input 2 (between 2 and 3 pins of CN1), control function number 6 to 10.
CN1
2
3
a 3-pin connector
b Outdoor unit PCB1
c Control circuit
d Power source
X1 Auxiliary relay
SS3 Demand current switch