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Installer's Guide
12. If a system pump-down is performed, turn off the associated equipment and close service valves prior
to removing the refrigerant piping. Failure to do so will introduce non-condensables in the system,
causing abnormal pressure in the refrigeration cycle which could lead to injury and damage.
13. Before system start-up, attach the refrigerant piping securely. Failure to do so will introduce non-
condensables into the system when the compressor is running, causing abnormal pressure in the
refrigeration cycle which could lead to injury and damage.
14. Establish a complete ground. Do not ground the unit to a utility pipe, arrester, or telephone ground.
An incomplete ground may cause electrical shock, or fire. A high surge current from lightning or other
sources may cause damage to the air conditioner.
15. If the power supply cable is damaged, it must be replaced by the manufacturer, its service agent or
another qualified professional in order to avoid electrical risk during and after replacement.
1. Do not install the unit in a place where there is danger of exposure to flammable gas leakage. If gas
leaks and builds up around the unit, it may result in fire.
2. After system installation is completed, make sure no refrigerant leakage is present.
3. This appliance is not intended for use by persons with a lack of experience and knowledge, unless
they have been given adequate supervision or instruction concerning use of the appliance by a
person responsible for their safety.
4. Children should be supervised to ensure that they do not play with the appliance.
1. Establish drain piping according to the instructions in this manual. Inadequate piping may cause
flooding.
2. Tighten the flare nut according to the specified method. If the flare nut is tightened too hard, the flare
nut may crack and cause refrigerant leakage.
Pre-Installation Checklist
1. Unpack and inspect each unit.
2. Check for any damage to the unit.
3. Check the model numbers to ensure a proper match.
4. Check the unit nameplate to ensure the proper electrical requirements will be met.
5. Check the installation locations to ensure the weight of the units can be supported.
6. Check the refrigerant pipe sizes and ensure they have been or will be installed according to the
requirements in this manual.
7. Check the outdoor unit nameplate for electrical power supply and wiring requirements to ensure the
proper wiring has been installed prior to connection.
8. Check the indoor unit for coil leakage. The pressure relief valve on the gas pipe should release
pressurized nitrogen which ensures the unit has not leaked during shipping.
6
CAUTION
NOTICE
88-M4MHW23-1A-EN
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