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4
What You Should Know Before Starting
Languages: This installation booklet is available in French and Spanish on our
web site at www.truth.com/technicalsupport.
Supply Voltage Note: The supply voltage range for the Sentry II power skylight
system is very flexible to accommodate supply voltages available from many
different countries. The input (supply) voltage range is 90 to 264 VAC at a
frequency range of 47 to 440 Hz. For practical purposes, the supply voltage
referenced in this document is 120 volts at 60 Hz commonly used in the United
States.
Operating Environment: The operating temperature range must be maintained
between 140º F (60º C) to -5º F (-20º C).
Single motor vs. multiple (synchronous) motor application: Most
applications of the Sentry II HS system will be a single motor on a single skylight.
However, the Sentry II HS motor system can be used in a number of different
applications depending on the size and weight of your skylight lid. The skylight
lid must weigh less than 160 lbs. (80 lbs. at the chain) for a single motor
installation. If your skylight lid is heavier than 160 lbs., multiple motors (up to 4)
can be used to lift a single skylight lid. The maximum skylight weight for 4
motors is 400lbs. This is called a synchronous motor application. Please refer to
page 29 for the details of this installation.
Multiple motors on separate skylights: There is a way of wiring several
motors on different skylights together so that they all will respond to one wall
switch or one HPI input. Please refer to page 28 for the details of this
installation.
Preparation
