1. Always check the unit nameplate for the MCA and MOP requirements.
2. The fuse is located on the main electrical board.
3. A dedicated indoor unit disconnect switch and power supply circuit may need to be installed
if local codes or jurisdictions require it. Otherwise, the indoor unit is powered directly from the
outdoor unit.
4. Install a separate disconnect at the outdoor unit. The power supply, wiring and grounding of
equipment must comply with National, State and/or local codes. The power supply must match
with the equipment nameplate specification.
5. Improperly installed and grounded field wiring poses fire and electrocution hazards. For
high voltage connections, flexible electrical conduit is recommended whenever vibration
transmission may create a noise problem within the structure. To avoid these hazards you
MUST follow requirements for field wiring installation and grounding as described in the
National Electrical Codes (NEC) and your State and/or local electrical codes. All field wiring
MUST be performed by qualified personnel. Failure to follow these requirements could result
in death or serious injury.
6. The wiring, including the ground wire, between the indoor and outdoor units should be at least
14 AWG, 600 volt rated, stranded wire, with an absolute maximum length of 230 ft. (70m).
Shorter lengths result in more robust communication between the indoor and outdoor unit.
Please select an appropriate length for the installation conditions. The wires cannot be cut and
spliced together.
7. For the wired controller: The communication distance between the main board and the wired
controller can be up to 65 ft. (19.8m). The standard distance is 25 ft. (7.6m).
Heat Pump Models 4TXK3809B 4TXK3812A 4TXK3818A 4TXK3824A
Power Supply 208/230V, 60Hz, 1phase
Electrical Requirements
27
38 Series Mini-Split
Electrical Connections
CAUTION
Improper operation may lead to personal injury or property damage.
Size the power supply wiring according to the NEC, local code and the MCA indicated on the unit
nameplate.
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