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Page 23
mrcool.com
Unit Installation
Indoor Unit Model Power Supply
Max. Overcurrent
Protection (A)
208/230V (60 Hz)
15 amps4 amps
MDUI18024E/MDUI18036E
Min. Circuit
Ampacity
Electrical Parameters
208/230V (60 Hz)
15 amps
8 amps
MDUI18048E/MDUI18060E
1. The fuse is located on the main board.
2. Install a circuit breaker at every power terminal near the units (indoor unit and thermostat) with at least
0.12 in (3 mm) contact gap. Both units must reach the plug.
3. Circuit breaker and power cord specifications listed in the above table are determined based on the
maximum power input of the units.
4. Specifications of power cords listed in the above table are applicable in a working condition where the
ambient temperature is 104°F (40°C) and multi-core copper cable (e.g. YJV copper cable, with insulated PE
and PVC sheath) is protected by a conduit, and is resistant to 194°F (90°C) in maximum (see IEC
60364-5-52). If working conditions change, please adjust the specifications according to national standards.
5. Specifications of circuit breaker are based on a working condition where the working temperature is 104°F
(40°C). If working conditions change, please adjust the specifications according to national standards.
6. The gauge of thermostat wire between the indoor unit and thermostat should be no less than 18 AWG
and at least 6 strand to ensure a proper connection. Please select a proper length of wire according to local
conditions. The maximum connection length is 98 feet (30 m).
Connecting the Power Cord & Communication Wire
WARNING
1. Before work begins, please check to ensure the unit and thermostat are powered “OFF”.
2. Match the terminal numbers and wire colors with the colors indicated in the indoor unit.
3. Incorrect wiring connections could burn the electrical components.
4. Connect the wires securely to the wiring box. Incomplete installation may lead to a fire hazard.
5. Please use wire clamps to secure the external covers of connecting wires. (Insulators must be
clamped securely; otherwise, electrical leakage may occur.)
6. Ground wire should be connected securely.
7. High and low voltage wires should be led through different rubber rings of the electric box cover.
8. High and low voltage wires should be secured separately. Secure the high voltage wires with large
clamps and the low voltage wires with small clamps.
9. Use screws to tighten the thermostat wires and power cords of the unit on the terminal board. An
improper connection could create a fire hazard.
10. If the power cords and thermostat wires are not correctly connected, the air conditioner could suffer
damage.
11. Ground the system by connecting the ground wire.
12. The units should comply with all applicable local and national rules and regulations on power
consumption.
13. When connecting the power cord, make sure the phase sequence of the power supply matches
with the corresponding terminals, otherwise the compressor will be reversed and operate
abnormally.
DO NOT bundle the thermostat wires or lay them side by side, otherwise errors will occur.
Electrical Connection
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