Mitsubishi FDT125VNPWVH - (12) Current safe; (13) Current cut; (14) Outdoor unit failure; (15) Serial signal transmission error protection

'22 • PAC-SM-412
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(ii) If the temperature of 115ºCisdetectedbythesensoronthedischargepipe,thenthecompressorwillstopim-
mediately.Whenthedischargepipetemperaturedropsandthetimedelayof3minutesisover,theunitstarts
againwithin1hourbutthereisnostartatthethirdtime.
(12) Current safe
(a) Purpose
Currentiscontrollednottoexceedtheupperlimitofthesettingoperationcurrent.
(b) Detail of operation
(i)
Inputcurrenttotheconverterismonitoredwiththecurrentsensorxedontheprintedcircuitboardoftheoutdoorunit
and,iftheoperationcurrentvaluereachesthelimitingcurrentvalue,thecompressorspeedisreduced.
(ii)Ifthemechanismisactuatedwhenthecompressorspeedislessthan30rps,thecompressorisstoppedimmediately.
Operationstartsagainafteradelaytimeof3minutes.
(13) Current cut
(a) Purpose
Inverterisprotectedfromovercurrent.
(b) Detail of operation
Outputcurrentfromtheinverterismonitoredwithashuntresistorand,ifthecurrentexceedsthesettingvalue,the
compressorisstoppedimmediately.Operationstartsagainafteradelaytimeof3minutes.
(14) Outdoor unit failure
Thisisafunctionfordeterminingwhenthereistroublewiththeoutdoorunitduringair-conditioning.
Thecompressorisstoppedifanyoneofthefollowinginitem(a),(b)issatised.Oncetheunitisstoppedbythisfunction,
it is not restarted.
(a)Whentheinputcurrentismeasuredat1Aorlessfor3continuousminutesormore
(b)
Iftheoutdoorunitsendsa0rpssignaltotheindoorunit3timesormorewithin20minutesofthepowerbeingturnedon
(15) Serial signal transmission error protection
(a) Purpose
Preventsmalfunctionresultingfromerrorontheindoor↔outdoorsignals.
(b) Detail of operation
(i) Ifthecompressorisoperatingandaserialsignalcannotbereceivedfromtheindoorcontrolwithoutdoorcontrol
havingserialsignalscontinuesfor7minutesand35seconds,thecompressorisstopped.
(ii)Afterthecompressorhasbeenstopped,itwillberestartedafterthecompressorstartdelayifaserialsignalcanbe
receivedagainfromtheindoorcontrol.
(16) Rotor lock
If the motor for the compressor does not turn after it has been started, it is determined that a compressor lock has occurred
and the compressor is stopped.
(17) Refrigeration cycle system protection
(a) Starting conditions
(i)When5(Heating:9)minuteshaveelapsedafterthecompressorONorthecompletionofthedefrostcontrol
(ii) Other than the defrost control.
(iii)When,aftersatisfyingtheconditionsof(i) and (ii)above,thecompressorspeed,indoorairtemperature(Thi-A)
andindoorheatexchangertemperature(Thi-R)havesatisfiedtheconditionsinthefollowingtablefor5minutes:
Compressor speed (N)Operation mode
Cooling
Heating
Indoor air temperature (Thi-A)
Thi-A−4<Thi-R
Indoor air temperature (Thi-A)/
Indoor heat exchanger temperature (Thi-R)
Thi-R<Thi-A+4
10 Thi-A
40
<
=
<
=
0 Thi-A 40
<
=
<
=
40 N
40 N : Outdoor air temperature 0°C
60 N : Outdoor air temperature 0°C
<
=
<
=
<
=
>
>
=
(b) Contents of control
(i)Whentheconditionsof(a)abovearesatisfied,thecompressorstops.
(ii)Errorstopoccurswhenthecompressorhasstopped3timeswithin60minutes.
(c) Reset condition
WhenthecompressorhasbeenturnedOFF