Safety Precautions; Precautions Before Installation; Safety Reminder On Installation Process; Precautions On Commissioning - McQuay MDS 30 Installation Manual

1.0 Safety Precautions

Please take note of the safety item stated below before and after the installation process:
1.1 Preparation before installation

Check the electrical power supply condition. Power supply shall meet the requirement of local rule and
regulation.

The tolerance of voltage shall be less than ±10% based on nominal voltage. It is not allowed to share the
same power cable through soldering as it will cause fluctuation of power supply.

Professional technician or engineer is needed to conduct the installation.

Follow the installation instruction in this manual. Improper installation may cause damage to the unit which
will then cause other accident to happen.

A solid base shall be built on the ground before installation of outdoor unit. The base shall be strong enough
to support the weight of the outdoor units. Counter measure should be taken against possible natural
disaster such as earthquake and typhoon.

Installation kits and protection kits shall be used to prevent injury.

1.2 Safety reminder on installation process


Do not touch the fins of heat exchanger. It may cause injury. Besides that, any damage on the heat
exchanger will reduce the heat exchange performance.

Secure the outdoor unit to avoid any vibration. The service panel and control box cover shall be closed
tightly to avoid any dirt and water from damaging the components.

Only air filter and heater provided/approved by factory shall be installed on the indoor units.

Action shall be taken to avoid refrigerant leakage during the installation process.

In case of any refrigerant leakage occur, open the window and door to improve ventilation and prevent fire
hazard.

Any electrical cable shall be kept away from water and humidity.

Do not change any settings of the protection devices unless instructed by factory.

Do not pull the electrical cable too tight, as it may cause the cable to break without notice.

Ensure the cable size is correct and sufficient to support the current and power consumption.

Unit must be earthed properly. Do not connect earth line with telephone line.

Indoor condensing water shall be drained away properly to avoid overflow. Insulation is needed for piping
connecting to the drain pan.

All units shall be handled and carried carefully during transportation.

After installation completed, the unit should undergo leakage test.

1.3 Precautions on commissioning


Power is to be supplied to the units for 12 hours before running them for the first time. This is to prevent any
damage of electrical components.

Avoid contact with power switch when hand is wet.

Do not remove the front panel or protection guard when the unit is in operation. The components running in
high speed may cause injury and damage.

Do not touch the refrigerant piping when the unit is running or just stop to avoid any injury.

Do not switch off the power supply immediately after the unit is off. Please wait for 5 minutes before shutting
down the power supply.

1.4 Precautions for devices that use R410A refrigerant


R410A is high pressure refrigerant. Do not use refrigerant piping of other type of refrigerant to prevent burst.

Do not use old refrigerator oil as it may contains large amount of chlorine that can cause the refrigerator oil in
R410A unit to deteriorate.

Use refrigerant piping that is made of phosphorus deoxidized copper and copper alloy seamless pipe.
Ensure the inner and outer surfaces of the pipes are clean and free of sulphur, oxide, dust, shaving particles,
oils, moisture and other contaminant.

Store the piping properly and keep both ends sealed until it is used to prevent dust and moisture.

Ensure that only liquid refrigerant is charged into the system as the composition of refrigerant is different in
gaseous phase.

Use ester oils, ether oil or small amount of alkylbenzene as the refrigerator oil to coat flares and flange
connection. Do not use mineral oil.

Use a vacuum pump with a reverse flow check valve. The vacuum pump oil may flow back into the
refrigerant cycle and cause the refrigerator oil to deteriorate.

Do not use refrigerant other than R410A.

Do not use tools such as gauge manifold, charge hose and etc which are not designed for R410A refrigerant.
Installation Manual IM-MDS_(i) 1