Carrier MMY-MAP0724FT9UL Service Manual page 83

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 MΩ or higher)
Is the main power voltage sufficient? (within FT9: 208/230V ± 10%, FT6: 460V ± 10%)
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?
A Header unit (A)
Follower unit (B)
Header unit (A) AWG
Follower unit (B) AWG
Indoor-outdoor connection terminals (U1, U2)
Outdoor-outdoor connection terminals (U5, U6)
Central control system connection terminals (U3, U4)
Suction
gas side
Header unit (A)
Follower unit (B)
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A Indoor unit
A
Indoor unit AWG
Discharge
Li quid side
gas side
A
MΩ or higher
V
Balance side