37MGHAQ: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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WIRING PRECAUTIONS
• All wiring must comply with local and national electrical codes,
regulations and must be installed by a licensed electrician.
• All electrical connections must be made according to the Electrical
Connection Diagram located on the panels of the indoor and outdoor
units.
• 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.
• Power voltage should be within 90-110% of rated voltage. Insufficient
power supply can cause malfunction, electrical shock, or fire.
• Installation of an external surge suppressor at the outdoor disconnect
is recommended.
• If connecting power to fixed wiring, a switch or circuit breaker that
disconnects all poles and has a contact separation of at least 1/8in
(3mm) must be incorporated in the fixed wiring. The qualified
technician must use an approved circuit breaker or switch.
• Only connect the unit to an individual branch circuit. Do not connect
another appliance to that outlet.
• Make sure to properly ground the air conditioner.
• Every wire must be firmly connected. Loose wiring can cause the
terminal to overheat, resulting in product malfunction and possible
fire.
• Do not let wires touch or rest against refrigerant tubing, the
compressor, or any moving parts within the unit.
• If the unit has an auxiliary electric heater, it must be installed at least
40in (1m) away from any combustible materials.
• 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.
• Make sure that you do not cross your electrical wiring with your signal
wiring. This may cause distortion, interference or possibly damage to
circuit boards.
• No other equipment should be connected to the same power circuit.
• Connect the outdoor wires before connecting the indoor wires.
OUTDOOR UNIT WIRING
1. Prepare the cable for connection
a. You must first choose the right cable size.
NOTE: Choose the cable type according to the local electrical codes
and regulations.
CHOOSE THE RIGHT CABLE SIZE
The size of the power supply cable, signal cable, fuse, and switch needed
is determined by the maximum current of the unit. The maximum current
is indicated on the nameplate located on the side panel of the unit. Refer
to this nameplate to choose the right cable, fuse, or switch.
NOTE: Select the right cable size according to the Minimum Circuit
Ampacity indicated on the nameplate of the unit.
b. Using wire strippers, strip the rubber jacket from both ends of
the signal cable to reveal approximately 5.9in (150mm) of
wire.
c. Strip the insulation from the ends.
d. Using a wire crimper, crimp the u-lugs on the ends.
NOTE: When connecting the wires, strictly follow the wiring
diagram found inside the electrical box cover.
2. Remove the electric cover of the outdoor unit. If there is no cover on
the outdoor unit, take off the bolts from the maintenance board and
remove the protection board.
Fig. 23 — Outdoor Unit
3. Connect the u-lugs to the terminals. Match the wire colors/labels with
the labels on the terminal block. Firmly screw the u-lug of each wire to
its corresponding terminal.
4. Clamp down the cable with the cable clamp.
5. Insulate unused wires with electrical tape. Keep them away from any
electrical or metal parts.
6. Reinstall the cover of the electric control box.
Before performing any electrical work, read these warnings.
WA R N I N G
Before performing any electrical work to wiring work, turn off the
main power to the system, read these warnings.
WA R N I N G
Before performing any electrical or wiring work, turn off the main
power to the system.
WA R N I N G
Screw
Connect the connective cables to the terminals, as identified, with
their matching numbers on the terminal block of the indoor and
outdoor units. For example, Terminal L1(A) of the outdoor unit
must connect with terminal L1/1 on the indoor unit. The outdoor
unit can match different types of indoor unit, the numbers on the
terminal block of the indoor unit may be slightly different. Please
pay special attention while connecting the wire.
CAUTION
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