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UNIT INSTALLATION
3
3.8 Electrical Wiring
Precautions
1. Before connecting lines, read the unit nameplate for information about voltages, circuit ampacity, capacity,
etc. Then, carry out line connection according to the schematic diagram.
2. The unit must have a special power supply line equipped with an electricity leakage switch and an air switch
to accommodate overload conditions. In addition, the leakage switch must be tested each month.
3. The unit must be grounded to avoid insulation failure.
4. Power cords should be fed through a cable trough or wiring pipe. Connect power cord into electrical box
through the criss-cross loop to avoid it becoming damaged by sheet metal edges.
5. The distance between power line and low voltage connections should be at least 5.9in (150mm).
6. All line connections should conform to the schematic diagram. A wrong connection could cause abnormal
operation or damage to the unit.
7. Keep all cables away from the refrigerant pipe, the compressor, and moving parts such as fans.
8. Do not alter the internal line connections inside the unit. MRCOOL shall not be liable for any loss or
abnormal operation arising from incorrect line connections.
9. If the supply cord is damaged, it must be replaced by MRCOOL or qualied technician to avoid hazards.
10. All of the supplied components, materials, and electric operation should be in accordance with local
requirements.
Wiring Connections
Perform the following checks before performing installing the unit:
1. Ensure the power supply is in accordance with the value on the nameplate.
2. The capacity of the power supply must be large enough.
3. The circuit must be installed by a professional technician.
4. In a xed circuit, there must be an electricity leakage protection switch of sucient power capacity and an air
switch with at least .1in (3mm) of space between its electrode contacts.
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