DCS HD30 Manual do Utilizador descarregar pdf (Página 15)

INSTALLATION INSTRUCTIONS

Plan the ductwork

The internal blower can be mounted to the front or back of the downdraft unit and be

ducted in multiple directions: left, right, down, forward or backwards. The remote blower

can be ducted downwards from the front or back of the downdraft unit.

In the event of installations where the blower is located on the back of the downdraft unit,

it is advised to leave an access door or opening to reach the bottom of the downdraft

unit, as well as where the wiring box and blower is located should service be needed.

Calculate the duct run length

The ductwork length should not exceed 55 equivalent feet (16.7 m) for 6” (152 mm)

round duct, or 75equivalent feet (22.9m) for 10” (254mm) round duct. Calculate the

length of the ductwork by adding the equivalent feet listed in the table below for each

piece of duct in the complete system. If flexible metal ductwork is used, each foot

(312mm) of flexible metal ductwork is equivalent to two feet (617mm) of straight metal

ductwork when calculating the duct run length.

For best results the size of the ductwork should be uniform and use no more than

three 90°elbows. Make sure that there is a minimum of 24” (607mm) of straight

duct between elbows if more than one is used. Round duct is recommended instead

of rectangular duct especially if elbows are needed. Rectangular duct should be

transitioned to minimum 6” (152mm) round for internal blowers and 10” (254 mm)

round for remote blowers as soon as possible.

EQUIVALENT LENGTH EXAMPLE CALCULATION

45° elbow 5 feet (1.5m) 9 feet straight duct 9 feet (2.8m)

90° elbow 7 feet (2.1m) 2 x 90° elbows 14 feet (4.3m)

90° flat elbow 12 feet (3.7m) Wall cap 0 feet (0.0m)

Wall cap 0 feet (0.0m) Complete system 23 feet (7.0m)

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 75 76

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DCS HD30 Manual do Utilizador Página 15