90
■ MAFP Type (for Link Wiring)
10-23. Caution
● This unit may be used in a single-type refrigerant system where 1 outdoor unit is connected to 1 indoor
unit, and also in a system where 1 outdoor unit is connected to multiple indoor units (maximum 4).
● If link wiring is used, set the outdoor unit system address to allow the combination of indoor and outdoor units to
be identified. At the same time, indicate the indoor-outdoor unit combination number in a location where it can
be checked easily (near the indoor unit nameplates). (This number will be required for subsequent maintenance.
Refer to 10-26-3, 4.)
● Request that the customer be present when the test run is performed. At this time, explain the operation manual
and have the customer perform the actual steps.
● Be sure to pass the manuals and warranty certificate to the customer.
● Check that the AC 220 – 240 V wiring is not connected to the inter-unit control wiring connector terminal.
If AC 220 – 240 V is accidentally applied, the indoor or outdoor unit control PCB fuse (0.5 A for both indoor and
outdoor units) will blow in order to protect the PCB. Correct the wiring connections, then disconnect the 2P con-
nectors (indoor: blue, OC) (outdoor: blue, serial 1) that are connected to the PCB, and replace them with 2P
connectors (indoor: brown, EMG) (outdoor: brown, serial 2). (Refer to the figure below.)
If operation is still not possible after changing the brown connectors, try cutting the varistor (black) (both indoor
and outdoor).
(Be sure to turn the power OFF before performing this work.)
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