Johnson Controls YEWS Series, Installation, Operation And Maintanance Instructions

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gain access to the control panel or electrical enclosures
during normal operation of the unit.
Refrigerants and Oils
Refrigerants and oils used in the unit are generally non-
toxic, nonflammable and noncorrosive, and pose no spe-
cial safety hazards. Use of gloves and safety glasses is,
however, recommended when working on the unit. The
build up of refrigerant vapor, from a leak for example,
does pose a risk of asphyxiation in confined or enclosed
spaces and attention should be given to good ventilation.
High Temperature and Pressure Cleaning
High temperature and pressure cleaning methods (e.g.
steam cleaning) should not be used on any part of the
pressure system as this may cause operation of the
pressure relief device(s). Detergents and solvents, which
may cause corrosion, should also be avoided.
1.7 Emergency Shutdown
In case of emergency, the control panel is fitted with an
emergency stop switch (red)which, when operated by
pressing the emergency stop switch removes the electrical
supply the control system and the microprocessor
controller, thus shutting down the unit.
1.8 Safety Labels
The following labels are fixed to each unit to give
instruction, or to indicate potential hazards which may
exist.
White symbol on blue background For safe
operation, read the Instructions firstly.
Black symbol on yellow background Warning:
Hot surface
Black symbol on yellow background Warning:
Isolate all electrical sources of supply before
opening or removing the cover, as lethal voltages
may exist
Black symbol on yellow background General
attention symbol
YEWS-E Water Cooling Screw Chiller/Heat Pump