Mitsubishi FDT125VNPWVH - Page 19

'22 • PAC-SM-412
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18
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(19) Abnormal temperature sensor (return air/indoor heat exchanger) broken wire/short-circuit detection
(a) Broken wire detection
Whenthereturnairtemperaturesensordetects-50°Corlowerortheheatexchangertemperaturesensordetect-50°Cor
lowerfor5secondscontinuously,thecompressorstops.After3-minutedelay,thecompressorrestartsbut,ifitisdetected
again within 60 minutes after the initial detection for 6 minutes continuously, stops again (the return air temperature
sensor:E7,theheatexchangertemperaturesensor:E6).
(b) Short-circuit detection
Iftheheatexchangertemperaturesensordetectsshort-circuitfor5secondscontinuouslywithin2minutesto2minutes
20secondsafterthecompressorONduringcoolingoperation,thecompressorstops(E6).
■
PriorityorderforcombinationsofCnTandCnTAinput.
Note(1)FollowingoperationcommandsareacceptedwhentheoperationprohibitionissetwithCnTAasindicatedwith*.
 Individualoperationcommandfromremotecontrol,testruncommandfromoutdoorunitandoperationcommandfromoptiondevice,CnTinput.
Reference:Explanationonthecodesandthecombinationsofcodesinthetableabove
1.

IncaseofCnT“Number”,theCnT“Number”isadoptedandCnTAisinvalidated.
2.

IncaseofCnTA“Number”,theCnTA“Number”isadoptedandCnTisinvalidated.
3.


IncaseofCnT“Number”/CnTA“Number”,theCnT“Number”andtheCnTA“Number”becomeindependentfunctionseachother.
4.

IncaseofCnT“Number”+CnTA“Number”,theCnT“Number”andtheCnTA“Number”becomecompetingfunctionseachother.
5.

IncaseofCnT“Number”>CnTA“Number”,thefunctionofCnT“Number”supersedesthatofCnTA“Number”.
6.

IncaseofCnT“Number”<CnTA“Number”,thefunctionofCnTA“Number”supersedesthatofCnT“Number”.
(The“Number”abovemeans
①
-
⑥
in the table.)
CnTA
①
Operation stop
level
②
Operation stop
pulse
③
Operation
permission/prohibition
④
Operation
permission/prohibitionpulse
⑤
Cooling/heating
selectionlevel
⑥
Cooling/heating
selection pulse
CnT
①
Operationstoplevel CnT
①
CnT
①
CnT
①+
CnTA
②
CnT
①
CnT
①/
CnTA
⑤
CnT
①/
CnTA
⑥
②
Operation stop pulse CnT
②
CnT
②
CnT
②+
CnTA
③
CnT
②
CnT
②/
CnTA
⑤
CnT
②/
CnTA
⑥
③
Operationpermission/prohibitionlevel CnT
③>
CnTA
①
CnT
③>
CnTA
②
CnT
③+
CnTA
③
CnT
③
CnT
③/
CnTA
⑤
CnT
③/
CnTA
⑥
④
Operationpermission/prohibitionpulse
CnT
④
CnT
④
CnT
④+
CnTA
③※
CnT
④
CnT
④/
CnTA
⑤
CnT
④/
CnTA
⑥
⑤
Cooling/heatingselectionlevel
CnT
⑤/
CnTA
①
CnT
⑤/
CnTA
②
CnT
⑤/
CnTA
③
CnT
⑤/
CnTA
④
CnT
⑤
CnT
⑤
⑥
Cooling/heatingselectionpulse CnT
⑥/
CnTA
①
CnT
⑥/
CnTA
②
CnT
⑥/
CnTA
③
CnT
⑥/
CnTA
④
CnT
⑥
CnT
⑥
(20) External input/output control (CnT or CnTA)
Externalinput/output connectors areprovidedon the indoorunit control PCB, andeach input/output is possibleto be
changedbyRC-EXZ3A.
Besuretoconnectthewiredremotecontroltotheindoorunit.RemoteoperationwithCnT/CnTAonlyisnotpossible.
・
CnT
・
CnTA

CnTA
Blue
12V
XR6
1
2

Input/Output Connector Factorydefaultsetting RC-EX3Afunctionname
Output
CnT-2 (XR1) Operation output External output 1
CnT-3 (XR2) Heatingoutput External output 2
CnT-4 (XR3) Compressor ON output External output 3
CnT-5 (XR4) Inspection(Error) output External output 4
"Input
(Volt-freecontact)"
CnT-6 (XR5) Remote operation input External input 1
CnTA (XR6) Remote operation input External input 2
(a) Output for external control (remote display)
Indoorunitoutputsthefollowingsignalforoperationstatusmonitoring.
Output name Condition
1 Operation output Duringoperation
2 Heatingoutput Duringheatingoperation
3 Compressor ON output Duringcompressoroperation
4 Inspection(Error) output When anomalous condition occurs.
5 Coolingoutput Duringcoolingoperation
6 Fanoperationoutput1 Whenindoorunit'sfanisoperating
7 Fanoperationoutput2 Whenindoorunit'sfanisoperating,andfanspeedishigherthanHispeed.
8 Fanoperationoutput3 Whenindoorunit'sfanisoperating,andfanspeedisLowerthanMespeed.
9 Defrost/oilreturnoutput Whenindoorunitreceivedefrost/oilreturnsignalfromtheoutdoorunit.
10 Ventilation output When"Venti.ON"isselectedfromremotecontrol
11 Freecoolingoutput
When the ambient temperatureisbetween10-18°Cincoolingandfanoperation
12 Indoorunitoverloadalrmoutput Referto"IUoverloadalarm"
13 Heater output Referto"(8)Thermostat
operation (b) Heating"
XR1
1
2
3
4
5
6
XR3
XR4
CnT
Blue
12V
XR2
XR5