Installation Guide

8
Electrical Connections
Page 33 mrcool.com
BEFORE PERFORMING ANY ELECTRICAL WORK, TURN OFF ALL POWER TO THE SYSTEM.
Note that wire colors of this series / model may differ from previous models, other series and general
conventions.
All wiring must be performed in accordance with the wiring diagrams shown in Fig. 7.1 and
demonstrated in the images
below.
DO NOT MIX UP LIVE AND NULL WIRES
This is dangerous and can cause the air conditioning unit to malfunction. Make sure you clearly distinguish the
Live (”L”) Wires from the other wires.
All wiring must be performed in accordance with the wiring diagrams shown in Fig. 7.1 and demonstrated in the
images shown here.
BEFORE PERFORMING ELECTRICAL WORK, READ THESE REGULATIONS
1.
All wiring must comply with local and national electrical codes.
2. All electrical connections must be made according to the Electrical Connection Diagram located on the
panels of the indoor and outdoor units.
3. If there is a serious safety issue with the power supply, stop work immediately. Explain your reasoning
to the client, and refuse to install the unit until the safety issue is properly resolved.
4. Power voltage should be within 90-100% of rated voltage. Insufficient power supply can cause
malfunction, electrical shock, or fire.
5. Circuit, including any switches, should have a capacity 1.5 times the maximum unit current (amps).
6. A qualified electrician must use an approved circuit breaker or switch that disconnects all poles and has
a contact separation of at least 1/8in (3mm).
7. Do not connect another appliance to the same circuit.
8. Make sure to properly ground the air conditioner.
9. Every wire must be firmly connected. Loose wiring can cause the terminal to overheat, resulting in
malfunction and possible fire. Double check that the screws are tightly fastened.
10. Do not let wires touch or rest against refrigerant tubing, the compressor, or any moving parts within the
unit.
11. If the unit has an auxiliary electric heater, it must be installed at least 40in (1 meter) away from
combustible materials.
12. To avoid getting an electric shock, never touch the electrical components soon after the power supply
has been turned off. After turning off the power, always wait 10 minutes or more before you touch the
electrical components.
13. Make sure that you do not cross your electrical wiring with your signal wiring. This may cause distortion
and interference.
14. The unit must be connected to the main outlet. Normally, the power supply must have an impedance of
32 ohms.
15. Connect the outdoor wires before connecting the indoor wires.