1. The manufacturer has a policy of continuous product and product data improvement and
reserves the right to change design and specifications without notice. Always check the unit
nameplate and wiring diagram for the actual unit 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, type stranded wire, with an absolute maximum length of 230 feet
(70m). Type SO cable (temporary wire) is not recommended. 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 standard length of control wire is 25 feet (7.6m). If extended length
is required, please refer to the wired control installation manual for splicing instructions.
Heat Pump Models M4THS2309 M4THS2312 M4THS2318 M4THS2324
MOP 15 20 25
MCA 9 10 15 16
Power Supply 208/230V, 60Hz, 1phase
Electrical Requirements
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.
88-M4MHW23-1A-EN 27
Installer's Guide
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