Mitsubishi FDUA125VNPWVH - (7) Cooling low outdoor air temperature protective control; (8) Heating high pressure control

'22 • PAC-SM-412
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31
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(5) Cooling overload protective control
(a) Operating conditions
(c) Reset conditions
(6) Cooling high pressure control
(a) Purpose
(b) Detector
(c) Detail of operation:
Outdoor heat exchanger temperature (°C)
(Example) Fuzzy
Outdoor heat exchanger temperature sensor (TH1)
1)
2)
-CB
-BA
8
20
C
2
A
B
C
8rps
(1)
8rps
(1)
0rps
After lapse of 20 sec. or over
(3)
After lapse of 20 sec. or over
(3)
After lapse of 20 sec. or over
(3)
lower limit
speed 30 rps
(b) Detail of operation
Item
FDC90, 100VNP-W
Outdoor air temperature
Lower limit speed
Model
40 41 46 47
OFF
ON1
ON2
Outdoor air temperature ( )
C
º
40 rps
The lower limit of compressor speed is set to 30 or 40 rps and even if the calculated result becomes lower than that after
fuzzy calculation, the speed is kept to 30 or 40 rps. However, when the thermostat OFF, the speed is reduced to 0 rps.
(7) Cooling low outdoor air temperature protective control
(a) Operating conditions
Whentheoutdoorairtemperature(TH2)isCºCorlowercontinuesfor20secondswhilethecompressorspeedis
otherthan0rps
(b) Detail of operation
(i)
Thelowerlimitofthecompressorspeedissetto40(30)<14>rpsandevenifthespeedbecomeslowerthan40(30)
<14>rps,thespeediskeptto40(30)<14>rps.However,whenthethermostatOFF,thespeedisreducedto0rps.
(ii) Theupperlimitofthecompressorspeedissetto50(60)<60>rpsandevenifthecalculatedresultbecomeshigher
thanthatafterfuzzycalculation,thespeediskeptto50(60)<60>rps.
Notes(1)Valuesin()areforoutdoorairtemperatureisCorD.
(2)Valuesin<>areforoutdoorairtemperatureisEorF.
CDAB FE
OFF
Upper limit 50 rps
Lower limit 40 rps
ON
ON
Upper limit 60 rps
Lower limit 30 rps
Outdoor air temperature (°C)
ON
Upper limit 60 rps
Lower limit 14 rps
●
ValuesofA,B,C,D,E,F
ModelFDC125VNP-W
(iii) Reset conditions
Wheneitherofthefollowingconditionissatised
1)Theoutdoorairtemperature(TH2)isFºCorhigher.
2) The compressorspeedis0rps.
(a) Operating condition
Whentheindoorheat exchanger temperature (Thi-R) has risen to a specied temperature while the compressor is
turned on
(b) Detail of operation
 Compressorspeediscontrolledaccordingtothezonesofindoorheatexchangertemperatureasshownbythefollow-
ingtable.
(8) Heating high pressure control
Thi-R < P1 P1
<
=
Thi-R < P2 P2
<
=
Thi-R < P3 P3
<
=
Thi-R
Protection control speed (NP)
Normal Retention NP
－
4rps NP
－
8rps
Sampling time (s)
Normal 10 10 10
Thi-R
P1 P2 P3
10
<
=
NP < 90
45 52 57
90
<
=
NP < 120
45 - 43 52 - 45 57 - 48
120
<
=
NP
43 45 48
Unit:°C
NP
ModelFDC125VNP-W
Outdoor air temperature (˚C)
A B C D E F
First time
0 3 16 19 22 25