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Checklist 1
• Using Checklist 1, check that there are no problems with the installation work.
Is the capacity of the
Outdoor total capacity
circuit breaker (Earth
leakage breaker)
appropriate?
Is the gauge of the
power cable correct?
Is the control
communication line
correct?
Is the power of indoor units supplied collectively?
Is it grounded to earth?
Is the resistance sufficient? (10 M
s I
h t
e
m
a
n i
p
o
w
r e
v
l o
a t
g
e
s
Is the diameter of connecting pipe correct?
Is the branch kit correct?
Is the water drain of the indoor unit arranged so that it flows without accumulation?
Is the heat insulation of pipes sufficient? (connecting pipes, branch kit)
Is there no short circuit of discharge air in the indoor/outdoor units?
After an airtightness test of the pipes, are vacuuming and adding of refrigerant executed?
Are the valves of all the outdoor units fully opened?
Indoor-outdoor connection terminals (U1, U2)
Outdoor-outdoor connection terminals (U5, U6)
Central control system connection terminals (U3, U4)
r o
h
g i
h
e
) r
f u
c i f
e i
n
? t
(
i w
h t
n i
3
8
0
4 -
1
5
V
A
Header unit (A)
Follower unit (B)
Follower unit (C)
Header unit (A)
Follower unit (B)
Follower unit (C)
±
1
0
%
)
Gas side
Header unit (A)
Follower unit (B)
Follower unit (C)
− 109 −
A
Indoor unit
A
A
2
mm
Indoor unit
2
mm
2
mm
M
or higher
V
Liquid side
Balance side
A
2
mm
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Troubleshooting
