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Safety Precautions
mrcool.com
WARNING for Using R32/R290 Refrigerant (continued)
Reusable mechanical connectors and flared joints should not be used indoors (EN Standard Requirements).
Mechanical connectors used indoors should have a rate of no more than 3g/year at 25% of the maximum
allowable pressure. When mechanical connectors are reused indoors, the sealing parts should be renewed.
When flared joints are reused indoors, the flared portion should be refabricated.
(UL Standard Requirements & IEC Standard Requirements).
Mechanical connectors used indoors should comply with ISO 14903.
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ELECTRICAL WARNINGS
Only use the specified power cord. If the power cord is damaged in any way, it must be replaced by the
manufacturer, its service agent, or a similarly qualified person in order to avoid a potential hazard.
Keep the plug of the power cord clean by removing any dust or dirt that accumulates on or around the plug.
A plug which is dirty can cause electric shock and/or a fire.
DO NOT
pull the power cord to unplug the unit from the outlet. Hold the plug firmly and pull it from the
outlet. Pulling directly on the cord can damage it, which can lead to electric shock and/or fire.
DO NOT
modify the length of the power supply cord or use an extension cord to power the unit.
DO NOT
share the electrical outlet with other appliances. Improper or insufficient power supply can cause
electrical shock and/or fire.
The product must be properly and securely grounded at the time of installation, or electrical shock could
occur.
All electrical wiring and work must be installed and performed in accordance with all local and national
wiring standards, regulations, and the installation manual. Ensure cables are connected tightly and securely
clamped to prevent external forces from damaging the terminal. Improper electrical connections must be
made according to the electrical connection diagram located on the panels of the indoor and oudoor units.
All wiring must be properly arranged to ensure that the control board cover can close properly. If the control
board cover cannot close, it could lead to corrosion and cause the connection points of the terminal to
overheat, catch fire, and/or cause electric shock.
If connecting power to fixed wiring, the following must be incorporated within it, in accordance with the wiring rules; an
all-pole disconnection device (which has at least 3 mm of clearances in all poles), and have a leakage current that may
exceed 10mA, the residual current device (RCD) having a rated residual operating current not exceeding 30mA, and
disconnection all must be present.
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Take Note of Fuse Specifications
The circuit board (PCB) of the air conditioner is designed with a fuse to provide overcurrent protection. The
specifications of this fuse are printed on the circuit board, such as:
T3.15AL/250VAC, T5AL/250VAC, T3.15A/250VAC, T5A/250VAC, T20A/250VAC, T30A/250VAC, etc.
NOTE: For units using R32 or R290 refrigerant, only blast-proof ceramic fuse can be used.
CLEANING & MAINTENANCE WARNINGS
DO NOT
attempt to clean the unit with the device on and the power connected. Turn off the device and
disconnect the power before cleaning in order to prevent electrical shock.
DO NOT
clean the air conditioner with excessive amounts of water.
DO NOT
clean the unit with combustible cleaning agents as these could cause a fire or deformation of some of
the parts of the unit.
