Whirlpool WED7500VW Specificaties - Pagina 5

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Venting Requirements

Venting systems for Whirlpool dryers must meet the following

requirements:

■

The capacity to handle 200 CFM of air for each dryer in the

system.

■

A back pressure of -1.0" (-25 mm) water column to

0.6" (15 mm) of water column when measured at the

connection to the dryer.

■

The minimum duct air velocity during normal operating

conditions should be at least 1,100 FPM to keep lint moving

in the air stream. (In a 4" diameter pipe, this requires at

least 96 CFM.)

Back pressure should be measured with an empty dryer, a clean

lint screen and with the dryer operating in the Air Only cycle

(no heat). Use an inclined manometer, such as Dryer model

102 (0"-2" [0 mm - 51 mm] range) or Dryer model 172

(0"-1" [0 mm - 25 mm] range) to measure the back pressure.

See the following illustration.

A. Dryer - empty and running on Air Only cycle

B. 12" (305 mm) min. of straight pipe - measure

back pressure from the center

C. To vent system

D. 0.6" (15 mm) water maximum back pressure

E. Inclined manometer

Single Dryer Venting Systems

Single dryer venting systems are defined as systems that have

only one dryer unit attached to a residential-type 4" (102 mm)

diameter rigid metal vent system. For single dryer venting

systems, see the Installation Instructions that came with your

dryer to determine the allowable length and number of elbows for

the venting system.

Additional Elbows

In cases in which the Installation Instructions do not address the

vent length for the specific number of elbows required for a

particular application, the following calculations may be used.

(The total vent system length includes all straight and curved

portions of the vent system.):

■

For 90° elbows, reduce the allowable vent system length by

10 ft (3.05 m).

■

For 45° elbows, reduce the allowable vent system length by

6 ft (1.83 m).

For example, if the Installation Instructions state that a dryer is

allowed 40 ft (12.2 m) of total vent length with two 90° bends, and

the installation requires three 90° bends, the total allowable vent

length would be reduced by 10 ft (3.0 m) (from 40 ft [12.2 m] to

30 ft [9.1 m]).

Dryer Airflow

The airflow of a dryer depends on the design of the exhaust vent.

Each dryer model has a maximum rated vent length, shown in the

product literature that is supplied with each model, or on the

Whirlpool.com website. The exhaust airflow of any Whirlpool

produced dryer at the maximum rated vent length is at least

100 CFM. The maximum airflow is 200 CFM. This includes

standard vent and long vent dryer models.

Codes Agency Approvals

All Whirlpool electric dryer models, including "long vent dryers,"

that are sold in the United States and Canada are UL listed

(reference UL2158 standard), and all Whirlpool gas dryer models

are CSA listed (reference ANSI Z21.5.1 standard). These

standards require testing at the maximum-rated exhaust vent

conditions that are published in the product literature for each

individual model. The designation for the UL or CSA listing can be

found on or adjacent to the serial label on the product.

Dryer Closet Installations

Closets used for dryer installation must provide multiple openings

to allow air to flow through the dryer and around the dryer to

dissipate heat. Refer to the product literature for details of room

venting requirements. Any dryer enclosure or room that does not

have an inlet and outlet for an operating forced air HVAC system is

considered a closet, and requires room venting as stated in the

product literature. The room venting can be installed into the walls

of the dryer enclosure, as well as the door, provided it will not be

blocked after the dryer is installed. Refer to the product literature

for minimum clearances between the product and the enclosure

surfaces.

"AF" Code

Certain electronic dryer models have airflow detection

capabilities. (See specific model product literature for details). If

the airflow in the dryer is extremely low, an "AF" code will be

displayed on the control panel. For single dryer venting systems,

this code means that you may have a blocked or partially blocked

vent or that your overall vent system length is too long. To resolve

this issue:

■

Check to see if the vent run from the dryer to the wall is

crushed. Refer to the "Venting Requirements" section of

the Use and Care Guide for more information.

■

Confirm that the vent run from the dryer to the wall is free

of lint and debris.

■

Confirm that the exterior vent exhaust hood is free of lint

and debris.

■

Confirm that your vent system falls within the

recommended run length and number of elbows for the

type of vent you are using. Refer to the "Plan Vent

System" section of the Use and Care Guide for details.

■

Select a Timed Dry heated cycle, and restart the dryer.

■

If the message persists, have your entire home venting run

cleaned.

For multi-dryer venting systems, the "AF" code means that your

vent may be blocked or partially blocked or that the venting

system is creating back pressure in excess of the maximum

allowable 0.6" (15 mm) water column. In this case, the engineering

firm that designed the system should be consulted.

Multiple Dryer Venting Systems

Multiple dryer venting systems must be designed specifically for

each application.

NOTE: It is recommended that an architectural or HVAC

engineering firm be consulted for designing the dryer venting

system.

Connecting a number of dryers to a single vent system is

common in coin-laundry stores and in many apartment buildings.

Listed here are some requirements for examples of three different

multiple dryer venting systems.