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Caution
1. Never fail to have an individual power circuit specifically for the heat pump
mini-split. As for the method of wiring, be guided by the circuit diagram posted on
the inside of control cover.
2. The screws which fasten the wiring in the electrical box are liable to come loose
from vibrations which the unit is subjected to during the course of transportation.
Check them and make sure that they are all tightly fastened. (If they are loose, it
could cause the wires to burn out.)
3. Specifications of power source.
4. Confirm that electrical capacity is sufficient.
5. Check that the starting voltage is maintained at more than 90 percent of the rated
voltage marked on the nameplate.
6. Confirm that the cable thickness is as specified in the power source specification.
7. Always install a GFI circuit breaker in a wet or moist area.
8. The following could cause a voltage drop.
9. The means for disconnection from a power supply shall be incorporated in the
fixed wiring and have an air gap contact separation of at least .12 inch in each
active (phase) conductors.
5.7 Grounding Principals
Equipment grounding provides protection from shock caused by a ground fault and
is required for all PV systems by the NEC. A ground fault occurs when a
current-carrying conductor comes into contact with the frame or chassis of the
faulty appliance or an electrical box. A person who touches the frame or chassis of
the faulty appliance will complete the circuit and receive a shock. The frame or
chassis is deliberately wired to a grounding electrode by an equipment grounding
electrode conductor. The wire does not normally carry current except in the event
of a ground fault. The grounding conductor must be continuous, connecting every
non-current carrying metal part of the installation to ground. It must bond or
connect to every metal electrical box, equipment chassis, and photovoltaic panel
mounting. The grounding wire is never fused, switched, or interrupted in any way.
When metal conduit or armored cable is used, a separate equipment ground is not
usually necessary since the conduit itself acts as the continuous conductor in lieu
of the grounding wire. Grounding wires are still needed to connect appliance
frames to the conduit.
The module frame must be properly grounded. The grounding wire must be
properly fastened to the module frame to assure good electrical contact.
If the support frame is made of metal, the surface of the frame must be
electroplated and have excellent conductivity. The grounding wire must be properly
fastened to the support frame.
There are two pre-drilled mounting holes in the frame, used to install the grounding
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