Dexter Laundry SWD EXPRESS - Dryer (On-Premise) - Manual (Page 7)

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3. MAKE-UP AIR. Adequate make-up air, 440 CFM (12.5 m
3
/Min.), must be supplied to replace
air exhausted by dryers on all types of installations. Provide a minimum of 1 sq. ft. (.14 m
2
)
make-up air opening to outside for each dryer. This is a net requirement of effective area.
Screens, grills or louvers which will restrict the flow of air must be considered. Consult the
supplier to determine the free area equivalent for the grill being used.
The source of make-up air should be located sufficiently away from the dryers to allow an even
air flow to the air intakes of all dryers. Multiple openings should be provided.
NOTE: The following considerations must be observed for gas dryer installation where dry
cleaners are installed.
The sources of all make-up air and room ventilation air movement to all dryers must be located
away from any dry cleaners. This is necessary so that solvent vapors will not be drawn into the
dryer inlet ducts. Dry cleaner solvent vapors will decompose in contact with open flame such as
the gas flame present in clothes dryers. The decomposition products are highly corrosive and will
cause damage to the dryer(s) ducts and clothes loads.
4. ELECTRICAL REQUIREMENTS. The electrical power requirements necessary to operate
the unit satisfactorily are listed on the serial plate located on the back panel of each dryer. The
electrical connection should be made to the terminal board, on the rear of the unit in the upper
control box using copper conductors of 15 A minimum capacity. It is absolutely necessary that
the dryer be grounded to a known (earth) ground.
The installation must meet the National Electrical Requirements of the country of installation.
Individual 15 A circuit breakers for each dryer are required. The installer must provide a
disconnect switch which will interrupt both lines. It may be a local or national requirement to
provide an electrical interruption switch visible and accessible from the room in which the dryer is
installed. The wiring diagram is located on the belt guard on the back of the dryer.
5. GAS REQUIREMENTS. The complete gas requirements necessary to operate the dryer
satisfactorily are listed on the serial plate located on the back panel of the dryer.
The inlet gas connection to the unit is ½ in. NPT pipe thread. However, the size of the piping to
supply the dryer should be determined by reference to national installation practice and
consultation with the local gas supplier.
A joint compound resistant to all fuel gases must be employed in making threaded pipe
connections.
A drip tee should be provided in the unit gas piping to catch dirt and other foreign articles.
All pipe connections should be checked for leakage with soap solution. Never check with an
open flame.