A SERVICE OF

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9
WIRING
The main power is supplied to the outdoor unit. The field supplied connecting cable from the outdoor unit to indoor unit consists of four
wires and provides the power for the indoor unit as well as the communication signal between the outdoor unit and indoor unit.
Voltage drop on the connecting cable should be kept to a minimum. Use cable size and max length below:
18 AWG 50 ft. (16 m)
16 AWG 100ft. (33 m)
CONNECTION DIAGRAMS
CONNECTING CABLE
CONNECTING CABLE
CONNECTING CABLE
CONTROL
CONTROL
Notes:
1.Do notuse thermostatwirefor any connection between indoor and outdoor units.
2.All connectionsbetween indoorand outdoor unitsmustbe asshown. Theconnectionsare sensitiveto polarity.
3.Onthe 18kand 24kunits, the“S” terminal “CONTROL”outputispulse DC with a potential ACvoltage shockhazard.
A07654
Fig. 5 – Connection Diagrams
38/40MVC, MVQ