724-746-5500 | blackbox.com
Page 14
724-746-5500 | blackbox.com
Chapter 1: Introduction
WARNING
This unit is fed by incoming power wires. Even with the service disconnect switch in the “Off” position, power may
still be “live” between the switch and the main power source. When performing service, always ensure that main
power is disconnected from the unit.
CAUTION
Equipment may contain components subject to electrostatic discharge (ESD). Before attempting to mount or service these
electronic devices, make sure you have no charge built up by touching a ground source. When possible, use a wrist-grounding
strap when working on or near electronic devices.
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.
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
The air-intake and discharge areas must be free of obstructions. Make sure access panels are secure and latched into position.
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.
CAUTION
Chilled water 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 before
uncapping the pipes.
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
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.
CAUTION
When filling the chilled water loop, all air must be bled from the piping system.
WARNING
Do not use chloride-based water-conditioning additives in the condensate drain pans. This will cause corrosion to
occur on the coil fins.