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Protection Control
SiEN18-622
108
Function
4.2
Low Pressure Protection Control
This low pressure protection control is used to protect compressors against the transient
decrease of low pressure.
[In cooling operation]
[In heating operation]
Pe<0.25MP
a
3
6Hz Unlo
a
d
Pe>0.
3
9MP
a
Pe<0.07MP
a
Low pre
ssu
re not limited
Low pre
ssu
re
s
t
a
nd
b
y
Pe<0.15MP
a
Pe>0.
3
0MP
a
Hot g
as S
VP = OFF
Hot g
as S
VP = ON
Pe: LP pre
ssu
re
s
en
s
or detection
v
a
l
u
e
Low pre
ssu
re
limited
When occ
u
rring
3
time
s
within
3
0 min., the
m
a
lf
u
nction code "E4" i
s
o
u
tp
u
t.
&
• T
s
-Teg<
8
deg
• Pe>0.06MP
a
• Pe>0.09MP
a
or
After 10
s
ec.
Pe<0.17MP
a
Pe<0.17MP
a
Pe>0.20MP
a
Pe< 0.07MP
a
C
u
rrent
s
tep limited
After 15
s
ec.
Low pre
ssu
re not limited
Low pre
ssu
re limited
INV
u
pper limit fre
qu
ency :
1-
s
tep
u
p from c
u
rrent
compre
ss
or fre
qu
ency
Pe: LP pre
ssu
re
s
en
s
or detection
v
a
l
u
e
INV
u
pper limit fre
qu
ency :
3
-
s
tep down from c
u
rrent
compre
ss
or fre
qu
ency
When occ
u
rring
3
time
s
within
3
0 min.,
the m
a
lf
u
nction code "E4" i
s
o
u
tp
u
t.
Pe<0.12MP
a
Pe>0.17MP
a
Hot g
as S
VP = OFF
Hot g
as S
VP = ON
Low pre
ssu
re
s
t
a
nd
b
y
Summary of Contents for FTKS50BVMB
Page 1: ...SiEN18 622 E Series Service Manual Applied Models zSuper Multi Plus Cooling Only Heat Pump ...
Page 105: ...Refrigerant Flow for Each Operation Mode SiEN18 622 92 Refrigerant Circuit ...
Page 157: ...Indoor Unit SkyAir Models SiEN18 622 144 Function ...
Page 312: ...SiEN18 622 Ceiling Mounted Cassette Type System Configuration 300 ...
Page 424: ...Method of Replacing The Inverter s Power Transistors Modules SiEN18 622 412 Troubleshooting ...
Page 446: ...Wiring Diagrams SiEN18 622 434 Appendix ...
Page 452: ...SiEN18 622 vi Index ...