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9. Maintenance
43
Communication failure with Unit A
43
Communication failure with Unit A
44
Communication failure with Unit B
44
Communication failure with Unit B
45
Communication failure with Unit C
45
Communication failure with Unit C
46
Communication failure with Unit D
46
Communication failure with Unit D
47
Unit A freeze protection
47
Unit A freeze protection
48
Unit B freeze protection
48
Unit B freeze protection
Compressor overload protection
49
Unit C freeze protection
49
Unit C freeze protection
50
Unit D freeze protection
50
Unit D freeze protection
overheating prevention protection
overheating prevention protection
51
Unit A
51
Unit A
n I
d
o
r o
u
n
t i
a
n
overheating prevention protection
52
Unit B
overheating prevention protection
52
Unit B
M
l a
u f
n
t c
o i
n
f o
overheating prevention protection
53
Unit C
overheating prevention protection
53
Unit C
Wrong connection of communication wire or malfunction of
overheating prevention protection
54
electronic expansion valve
Unit D
overheating prevention protection
54
Unit D
Malfunction of complete units current detection
55
Unit A communication wire misconnection or expansion valve malfunction
55
Unit A communication wire misconnection or expansion valve malfunction
M
l a
u f
n
t c
o i
n
p
o r
56
Unit B communication wire misconnection or expansion valve malfunction
56
Unit B communication wire misconnection or expansion valve malfunction
Detection status of wrong connection of communication wire
57
Unit C communication wire misconnection or expansion valve malfunction
57
Unit C communication wire misconnection or expansion valve malfunction
or malfunction of electronic expansion valve
58
Unit D communication wire misconnection or expansion valve malfunction
58
Unit D communication wire misconnection or expansion valve malfunction
M
o
d
e
c
o
n
l f
t c i
R
e
r f
g i
e
a r
t n
e r
- X
a f
n
D
f e
o r
t s
n i
g
r o
l i o
Start failure of compressor
Note: discharge the position in below pictures with discharge resistance after open the top cover and
Note: discharge the position in below pictures with discharge resistance after open the top cover and
H
g i
h
i d
c s
h
a
g r
check if the voltage is below 20V with universal meter, then begin to check.
check if the voltage is below 20V with universal meter, then begin to check.
Overload protection
14/18K:
W
h
o
e l
u
n
t i
o
v
e
14/18K:
C
o
m
p
e r
s s
r o
p
Compressor desynchronizing
C
o
m
p
e r
s s
r o
p
IPM modular protection
DC bus-bar low volt
D
C
b
u
s
b -
r a
h
g i
PFC protection
T
h
e
o f
u
- r
w
a
y
9.3 Malfunction Checking and Elimination
1 IPM protection malfunction:
1 IPM protection malfunction:
Main checking point:
Main checking point:
If the input voltage of the unit is within normal range?
If the input voltage of the unit is within normal range?
If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
If the unit is overloaded? If the heat radiation of the unit is good?
If the unit is overloaded? If the heat radiation of the unit is good?
If the refrigerant charge is suitable?
If the refrigerant charge is suitable?
Flow chart:
Flow chart:
58
d
o
u
d t
o
r o
u
n
t i
d
o
n
t o
m
a
c t
h
m
e
m
o
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c
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p i
e t
t c
o i
n
f o
o
u
d t
o
r o
a f
n
1
c
c y
n i l
g
m
o
d
e
e r
u t
n r
n i
h
e
t a
n i
g
m
o
d
e
e
e t
m
p
e
a r
u t
e r
p
o r
e t
t c
o i
n
f o
c
o
c r
r u
e r
t n
p
o r
e t
t c
o i
n
h
a
s
e
c
r u
e r
t n
p
o r
e t
t c
o i
n
h
a
s
- e
a l
k c
n i
g
p /
h
a
s
- e
n i
v
e
s r
e
p
a
g
e
p
o r
e t
t c
o i
n
h
v
o
a t l
g
e
p
o r
e t
t c
o i
n
v
a
v l
e
s i
a
b
n
r o
m
l a
Viewing malfunction code
through remote controller within
200s; displayed directly on
nixietube after 200s
H
a
d r
H
a
d r
Hardware malfunction
Hardware malfunction
H
a
d r
Operation status
O
O
O
O
m
p
e r
s s
r o
24/28K:
24/28K:
Viewing malfunction code
through remote controller within
o r
e t
t c
o i
n
200s; displayed directly on
nixietube after 200s
w
a
e r
m
l a
u f
n
t c
o i
n
w
a
e r
m
l a
u f
n
t c
o i
n
w
a
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m
l a
u f
n
t c
o i
n
p
r e
t a
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n
s
a t
u t
s
p
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t a
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s
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p
r e
t a
o i
n
s
a t
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s
p
r e
t a
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n
s
a t
u t
s
Installation and Maintenance
Service Manual
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