Daitsu FMCD*ECM series - Control Logics for 4-Pipe System

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SK2014‐SON‐002‐TechMnl‐FMCD‐003
POST‐HEAT
WithandWithoutElectricalHeater
a) AUX1isturnedoff.Electricalheateristurnedoff.
b) Indoorfanwillshutdownaftertheunithasbeenturnedofffor20seconds.

LOWTEMPERATUREPROTECTIONOFINDOORCOIL
a) IfTi1≤2ºCfor2minutes,thenAUX2isturned
off.Ifindoorfanrunsatlowspeed,thenitwillrun
atmediumspeed.Ifindoorfanrunsatmediumorhighspeed,thenitwillrunatsetspeed.
b) IfTi1≥5ºCfor2minutes,thenAUX2isturnedon.Indoorfanrunsatsetspeed.

OVER‐
HEATPROTECTIONOFINDOORCOIL
a) IfTi1≥75ºC,thenAUX1isturnedoff.Indoorfanremainsonandrunsathighspeed.
b) IfTi1<70ºC,thenAUX1isturnedon.Indoorfanremainsandrunsatsetspeed.
c) Iftheindoorcoiltemperaturesensorisdamaged,then
theprotectionmodewillbe
overriddenandtheunitwillworkaccordingtothepre‐heatandpost‐heatprogram.

DEHUMIDIFICATIONMODE
a) MTV1,MTV2,AUX1andheaterarealwaysoff.
b) IfTr≥25ºC,thentheindoorfanandAUX2willbeturnedonfor3minutes,andthen
off
for4minutes.
c) If16ºC≤Tr<25ºC,thentheindoorfanandAUX2willbeturnedonfor3minutes,and
thenofffor6minutes.
d) IfTr<16ºC,thentheindoorfanandAUX2willbeturnedofffor4minutes.
e) Attheendoftheabovedehumidificationcycle,thesystemwilldecidethenext
dehumidificationcontroloption.Indoorfanwillrunatlowspeedthroughoutthe
dehumidificationprocess.

AUTO‐MODE
a) Notallowed.


C.1.6. ControlLogicsfor4‐PipeSystem
Note:Unitisequippedwitha4x2switchingdevice.
COOLMODE
a) MTV2,AUX1andElectricalHeaterarealwaysof f.
b) IfTr≥Ts+1ºC(or+4ºCifeconomycontactisactivated),thencooloperationisactivated,MTV1andAUX2are
turnedon.Indoorfanrunsatsetspeed.

c) IfTr<Ts,thencooloperationisterminated,MTV1andAUX2areturnedof f.Indoorfanrunsatsetspeed.
d) TherangeofTsis16‐30ºC
e) Indoorfanspeedcanbeadjustedtolow,medium,highandauto.
f) Whenturnedon,MTV1requires30
secondsbeforeitisfullyopen.
g) Whenturnedoff,MTV1requires120secondsbeforeitisfullyclosed.
h) Whentheunitisturnedoff,theindoorfanwillshutdownafter5seconds.

FANMODE

a) Indoorfanrunsatthesetspeedwhileheater,MTV1,MTV2,AUX1
andAUX2areturnedoff.
b) Indoorfanspeedcanbeadjustedtolow,mediumandhigh.
