CAUTION: Risk of contact with sharp edges, splinters, and exposed fasteners. Can cause injury. Only
properly trained and qualified personnel wearing appropriate, OSHA approved PPE should attempt to move,
lift, remove packaging from or prepare the unit for installation.
CAUTION: Risk of contact with hot surfaces. Can cause injury. The electronic housing, refrigerant discharge
lines, fan motor, and some electrical components are extremely hot during unit operation. Allow sufficient
time for them to cool to a touch-safe temperature before working within the unit cabinet. Use extreme caution
and wear appropriate, OSHA approved PPE when working on or near hot components.
CAUTION: Risk of exposure to harmful noise levels. Can cause hearing injury or loss. Depending on the
installation and operating conditions, a sound pressure level greater than 70dB(A) may arise. Take
appropriate technical safety measures. Operating personnel must wear appropriate, OSHA approved PPE
and observe all appropriate hearing protection safety requirements.
Risk of improper power supply connection. Can cause equipment damage and loss of warranty coverage.
Prior to connecting any equipment to a main or alternate power source (for example: backup generator
systems) for startup, commissioning, testing, or normal operation, ensure that these sources are correctly
adjusted to the nameplate voltage and frequency of all equipment to be connected. In general, power source
voltages should be stabilized and regulated to within ±10% of the load nameplate nominal voltage. Also, ensure
that no three phase sources are single phased at any time.
NOTICE
Risk of oil contamination with water. Can cause equipment damage.
Polyolester oil (POEoil), required with R-407C/R-410A and used with some R-22 systems, is much more
hygroscopic than mineral oils. This means that POE oil absorbs water at a much faster rate when exposed to air
than previously used mineral oils. Because water is the enemy of a reliable refrigeration system, extreme care
must be used when opening systems during installation or service. If water is absorbed into the POE oil, it will
not be easily removed and will not be removed through the normal evacuation process. If the oil is too wet, it
may require an oil change. POE oils also have a property that makes them act as a solvent in a refrigeration
system. Maintaining system cleanliness is extremely important because the oil will tend to bring any foreign
matter back to the compressor or plug the microchannel coil. Always use a flow of dry nitrogen when brazing.
NOTICE
Risk of control malfunction. Can cause improper unit operation.
Verify that all low voltage electrical wiring has been performed per the schematic diagram provided and that
all low voltage wiring connections are tight.
1 Important Safety Instructions
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