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724-746-5500 | blackbox.com
724-746-5500 | blackbox.com
Page 15
Chapter 1: Introduction
CAUTION
Never work on electrical equipment unless another person who is familiar with the operation and hazards of the equipment and
is competent in administering first aid is nearby.
CAUTION
All personnel working on or near equipment should be familiar with hazards associated with electrical maintenance. Safety
placards/stickers are placed on the unit to call attention to all personal and equipment damage hazard areas.
WARNING
Refrigerant (R410A) is used with this equipment. Death or serious injury may result if personnel fail to observe proper
safety precautions. Great care must be exercised to prevent contact of liquid refrigerant or refrigerant gas, discharged
under pressure, with any part of the body. The extremely low temperature resulting from the rapid expansion of
liquid refrigerant or pressurized gas can cause sudden and irreversible tissue damage.
As a minimum, all personnel should wear thermal protective gloves and face-shield/goggles when working with
refrigerant. Application of excessive heat to any component will cause extreme pressure and may result in a rupture.
Exposure of refrigerant to an open flame or a very hot surface will cause a chemical reaction that will form carbonyl
chloride (hydrochloric/hydrofluoric acid); a highly poisonous and corrosive gas commonly referred to as PHOSGENE.
In its natural state, refrigerant is a colorless, odorless vapor with no toxic characteristics. It is heavier than air and will
disperse rapidly in a well-ventilated area. In an unventilated area, it presents a danger as a suffocant.
Always refer to the manufacturer’s Material Safety Data Sheet (MSDS) provided with the unit.
CAUTION
Certain maintenance or cleaning procedures may call for the use and handling of chemicals, solvents, or cleansers. Always refer to
the manufacturer’s MSDS prior to using these materials. Clean parts in a well-ventilated area. Avoid inhalation of solvent fumes
and prolonged exposure of skin to cleaning solvents. Wash exposed skin thoroughly after contact with solvents.
CAUTION
Do not use cleaning solvents near open flame or excessive heat. Wear eye protection when blowing solvent from parts. The
pressure-wash should not exceed 30 psig. Solvent solutions should be disposed of in accordance with local and state regulatory
statutes.
WARNING
When performing brazing or de-brazing operations, make certain the refrigeration system is fully recovered and
purged and dry nitrogen is flowing through the system at the rate of not less than 1–2 CFM (.03–.06 m
3
/minute).
CAUTION
The air-intake and discharge areas must be free of obstructions. Make sure access panels are secure and latched into position.
CAUTION
Cooling coils (and associated piping circuits) are pressurized and sealed when they leave the factory. Before installing the
interconnecting piping, observe appropriate safety precautions and release the pressure via an available stem valve or Schrader
®
valve before uncapping the pipes.
CAUTION
After interconnecting piping is installed, you must clean the piping system. If you use solvents/cleaning solutions, be sure they are
completely flushed from the piping before connecting it to the unit. Failure to do so will result in equipment problems.