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Checklist 1
• Check that there are no problems with the installation work.
Is the capacity of the
circuit breaker (Earth
leakage breaker)
appropriate?
Outdoor total capacity A Header unit (A) A Indoor unit A
Follower unit (B) A
Is the gauge of the
power cable correct?
Header unit (A) AWG
Indoor unit AWG
Follower unit (B) AWG
Is the control
communication line
correct?
Indoor-outdoor connection terminals (U1, U2)
Outdoor-outdoor connection terminals (U5, U6)
Central control system connection terminals (U3, U4)
Is the power of indoor units supplied collectively?
Is it grounded to earth?
Is the resistance sufficient? (10 M
Ω
or higher) M
Ω
or higher
Is the main power voltage sufficient? (within FT9: 208/230V ± 10%, FT6: 460V ± 10%) V
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?
Li
Discharge
gas side
quid side Balance side
Header unit (A)
Follower unit (B)
Suction
gas side
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