Check
SiEN18-622
404
Troubleshooting
8. Check
Check No.01
Check for causes of rise in high pressure
Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points.
S
hort circ
u
it
Ri
s
e in high
pre
ssu
re
Loc
a
l
pre
ssu
re
ri
s
e
High pipe
re
s
i
s
t
a
nce
S
top v
a
lve clo
s
ed
Bent or cr
as
hed pipe
Clogging of foreign
p
a
rticle
s
←
Check to
b
e
su
re the
s
top v
a
lve i
s
open.
←
Cond
u
ct vi
sua
l check
s
for pipe condition
s
.
←
I
s
there
a
ny temper
a
t
u
re difference c
aus
ed
b
efore
a
nd
a
fter the filter or
b
r
a
nch pipe.
[In cooling]
If the o
u
tdoor
u
nit electronic
exp
a
n
s
ion v
a
lve i
s
throttled:
(
S
ee
*
1.)
F
au
lty o
u
tdoor
u
nit electronic
exp
a
n
s
ion v
a
lve
F
au
lty indoor
u
nit electronic
exp
a
n
s
ion v
a
lve
F
au
lty v
a
lve coil
F
au
lty v
a
lve
b
ody
←
Are the coil re
s
i
s
t
a
nce
a
nd in
su
l
a
tion norm
a
l?
A temper
a
t
u
re difference in exce
ss
of 10
°
C
b
etween the inlet
a
nd the o
u
tlet i
s
deemed to
b
e
ab
norm
a
l.
F
au
lty
control
F
au
lty high pre
ssu
re
s
en
s
or
F
au
lty control PCB
←
Are the electric
a
l ch
a
r
a
cteri
s
tic
s
norm
a
l?
←
I
s
the pre
ssu
re v
a
l
u
e checked with the
S
ervice Checker
corre
s
ponding to the me
asu
rement of the pre
ssu
re
s
en
s
or?
←
Are the coil re
s
i
s
t
a
nce
a
nd in
su
l
a
tion
norm
a
l?
F
au
lty high
pre
ssu
re
control
F
au
lty v
a
lve coil
F
au
lty v
a
lve
b
ody
[In he
a
ting]
If the indoor
u
nit electronic
exp
a
n
s
ion v
a
lve exce
ss
ively
throttled:
(
S
ee
*
2.)
F
au
lty
control
F
au
lty high pre
ssu
re
s
en
s
or
F
au
lty indoor
u
nit
li
qu
id pipe thermi
s
tor
F
au
lty control PCB
←
Are the electric
a
l ch
a
r
a
cteri
s
tic
s
norm
a
l?
←
I
s
the connector properly connected?
Are the thermi
s
tor re
s
i
s
t
a
nce ch
a
r
a
cteri
s
tic
s
norm
a
l?
←
I
s
the pre
ssu
re v
a
l
u
e checked with the
S
ervice
Checker corre
s
ponding to the me
asu
rement of the
pre
ssu
re
s
en
s
or?
[In cooling]
High
su
ction
a
ir
temper
a
t
u
re
of the
conden
s
er
[In he
a
ting]
High
su
ction
a
ir
temper
a
t
u
re
of o
u
tdoor
u
nit
S
hort circ
u
it
High
a
m
b
ient temper
a
t
u
re
←
I
s
the
su
ction
a
ir temper
a
t
u
re not more th
a
n
46
°
C?
←
I
s
the o
u
tdoor temper
a
t
u
re not more th
a
n 46
°
C?
High
su
ction
a
ir temper
a
t
u
re
of indoor
u
nit
High
a
m
b
ient temper
a
t
u
re
←
I
s
the
su
ction
a
ir temper
a
t
u
re not more th
a
n 27
°
C?
←
I
s
the indoor temper
a
t
u
re not more th
a
n 27
°
C?
F
au
lty
su
ction
a
ir thermi
s
tor of indoor
u
nit
High
su
ction
a
ir temper
a
t
u
re of o
u
tdoor
u
nit
F
au
lty o
u
tdoor temper
a
t
u
re thermi
s
tor of o
u
tdoor
u
nit
←
I
s
the connector properly connected?
Are the thermi
s
tor re
s
i
s
t
a
nce ch
a
r
a
cteri
s
tic
s
norm
a
l?
←
I
s
the o
u
tdoor temper
a
t
u
re not more th
a
n 16?CWB?
←
I
s
the connector properly connected?
Are the thermi
s
tor re
s
i
s
t
a
nce ch
a
r
a
cteri
s
tic
s
norm
a
l?
Degr
a
d
a
tion
in conden
s
ing
c
a
p
a
city
Dirty conden
s
er
Mixing of non-conden
sab
le g
as
←
I
s
the he
a
t exch
a
nger clogged? (In cooling)
←
I
s a
ir or el
s
e mixed in the refriger
a
nt
s
y
s
tem?
Decre
as
ed
f
a
n
a
irflow
r
a
te
Decre
as
ed
f
a
n
o
u
tp
u
t
F
au
lty f
a
n
motor
←
C
a
n the f
a
n motor
b
e rot
a
ted with h
a
nd
s
?
Are the motor coil re
s
i
s
t
a
nce
a
nd
in
su
l
a
tion norm
a
l?
←
If
a s
p
a
re PC
b
o
a
rd i
s
mo
u
nted, i
s
the
c
a
p
a
city
s
etting properly m
a
de?
F
au
lty control
PC
b
o
a
rd
(Incl
u
ding
c
a
p
a
city
s
etting)
High
a
ir
p
assa
ge
re
s
i
s
t
a
nce
Dirty filter
←
I
s
the
a
ir filter clogged?
O
bs
t
a
cle
←
I
s
there
a
ny o
bs
t
a
cle in the
a
ir p
assa
ge?
Exce
ss
ive refriger
a
nt ch
a
rging
Improper model
s
election [In he
a
ting]
←
Refer to p
a
ge
3
69.
←
I
s
the indoor
u
nit too
s
m
a
ll comp
a
red to
the l
a
rge-
s
ized o
u
tdoor
u
nit?
*
1: In cooling, it i
s
norm
a
l if the o
u
tdoor
u
nit electronic exp
a
n
s
ion v
a
lve (EV1) i
s
f
u
lly open.
*
2: In he
a
ting, the indoor
u
nit electronic exp
a
n
s
ion v
a
lve i
s us
ed for
“sub
cooled degree control
”
.
C:
S
DK04009
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 ...
