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Whirlpool WED7500VW Ventilation Specification - Page 6

Option 1 - Horizontal System, Option 2 - Vertical System, Option 3 - Com, ination System - washer

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Option 1 - Horizontal System The most common is the horizontal system, in which banks of dryers are all located in one room and vented through a common duct. See the following illustration for an example of a generic horizontal system. Option 3 - Combination System The combination system may be used in high-rise apartments, with a bank of dryers installed at several different levels. Each of these banks then exhausts into a central vertical vent. See the following illustration for an example of a combination system. A A 1"* (25 mm) A. 4" (102 mm) diameter rigid metal back draft damper *Minimum spacing required between dryers Option 2 - Vertical System The vertical system is used in some apartment buildings that have a washer and dryer on each floor. Each dryer is exhausted into the same central vertical duct. See the following illustration for an example of a generic vertical system. D A F E B C F F G A. 0.6" (15 mm) water column maximum back pressure B. Weighted dampers C. Individual dryer exhaust - on each floor D. 0.1" (2.5 mm) water column maximum vacuum E. Main duct F. Barometric damper (use depends on exhaust system design) G. Source of outside air E B C D A. Central vertical duct - maximum of 0.1" (2.5 mm) water column vacuum B. Weighted damper (each dryer) C. Maximum of 0.6" (15 mm) water column back pressure D. Barometric damper (use depends on exhaust system design) E. Outside air source 6

Section	Page
dryer venting specifications	1
Table of Contents	1
dryer Safety	1
Post the following warning in a prominent location.	1
installation requirements	4
WARNING: To reduce the risk of fire, this dryer MUST BE EXHAUSTED OUTDOORS.	4
NOTE: This guide is intended to aid licensed HVAC or Architectural Engineers who design single and multi-dryer unit venting systems for Whirlpool Corporation dryers sold in the United States. Whirlpool Corporation provides required airflow and back p...	4
Outside Exhaust	4
The four basic reasons for exhausting a dryer outdoors are detailed in this section:	4
1. To meet codes requirements.	4
2. To remove moisture from laundry area.	4
3. To avoid lint accumulation in laundry area.	4
4. To remove excess heat from laundry area.	4
Codes Requirements	4
The following codes should be reviewed to ensure dryer vent systems are in compliance:	4
1. International Mechanical Code: In the 2000 version, sections 504 and 913.	4
2. International Fuel Gas Code: In the 2003 version, section 614.	4
3. UL 2158 Electric Clothes Dryer Standard references venting requirements in paragraph 7.3.	4
4. ANSI Z21.5.1 - Gas Clothes Dryers.	4
5. Other sections of these codes may also apply to multi-dryer vent systems.	4
There are other codes requiring dryers to be exhausted when installed in confined spaces where specified clearances from combustible surfaces cannot be met. See the Installation Instructions that came with your dryer for spacing requirements.	4
Local codes and ordinances that exist must also be met. Consult your local building inspector for more information.	4
Moisture	4
A normal towel load contains some residual water when it is removed from the washer. The dryer must remove this water and discharge it from the drum. When the dryer is not exhausted outside, this moist air will be recirculated through the heating sou...	4
Exhausting moisture into the room can also cause damage to walls, floors, picture hangers, and cause condensation on windows and walls in cold weather.	4
Lint	4
Even though the dryer is equipped with a lint screen, fine particles of lint can get through the screen and be exhausted out of the dryer. Proper venting of the dryer will keep lint from accumulating in the laundry area.	4
Heat	4
In order to remove moisture from the garments in the dryer, heat is generated to vaporize the water. Exhausting the dryer outdoors removes excess heat from the laundry area of the building.	4
Central Exhaust System Requirements	4
The following guidelines should be considered in the design of any central exhaust system:	4
Venting Requirements	5
Venting systems for Whirlpool dryers must meet the following requirements:	5
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\	5
Single Dryer Venting Systems	5
Single dryer venting systems are defined as systems that have only one dryer unit attached to a residential-type 4\	5
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 cu...	5
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) (fr...	5
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 Whirlpoo...	5
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...	5
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 th...	5
“AF” Code	5
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 ...	5
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\	5
Multiple Dryer Venting Systems	5
Multiple dryer venting systems must be designed specifically for each application.	5
NOTE: It is recommended that an architectural or HVAC engineering firm be consulted for designing the dryer venting system.	5
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.	5
The most common is the horizontal system, in which banks of dryers are all located in one room and vented through a common duct. See the following illustration for an example of a generic horizontal system.	6
The vertical system is used in some apartment buildings that have a washer and dryer on each floor. Each dryer is exhausted into the same central vertical duct. See the following illustration for an example of a generic vertical system.	6
The combination system may be used in high-rise apartments, with a bank of dryers installed at several different levels. Each of these banks then exhausts into a central vertical vent. See the following illustration for an example of a combination sy...	6
Dryer inspection and cleaning	7
Frequency of Exhaust System Cleaning	7
Every exhaust system must be inspected periodically and cleaned to ensure that it is intact and free from lint accumulation. The frequency of these inspections will vary, depending on the system and usage of the dryer. For single-family usage, an ann...	7
Inspecting the Exhaust System	7
1. Disconnect the exhaust duct from the dryer and from the exhaust hood (at the exhaust outlet).	7
2. Inspect the interior of the duct and remove any lint accumulation.	7
3. Reassemble the exhaust duct and hood, checking that the joints are secure.	7