® DRYER VENTING SPECIFICATIONS Table of Contents DRYER VENTING SPECIFICATIONS..................................................................................................1 DRYER SAFETY....................................................................................................................................1 INSTALLATION REQUIREMENTS ......................................................................................................4 Venting Requirements .......................................................................................................................5 DRYER INSPECTION AND CLEANING ..............................................................................................7 Frequency of Exhaust System Cleaning ...........................................................................................7 Inspecting the Exhaust System .........................................................................................................7 DRYER SAFETY Your safety and the safety of others are very important. We have provided many important safety messages in this manual and on your appliance. Always read and obey all safety messages. This is the safety alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and others. All safety messages will follow the safety alert symbol and either the word “DANGER” or “WARNING.” These words mean: DANGER WARNING You can be killed or seriously injured if you don't immediately follow instructions. You can be killed or seriously injured if you don't follow instructions. All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury, and tell you what can happen if the instructions are not followed. ■ If you are installing a gas dryer, it is recommended that the owner post, in a prominent location, instructions for the customer’s use in the event the customer smells gas. This information should be obtained from your local gas supplier. Post the following warning in a prominent location. FOR YOUR SAFETY Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. W10100920C WARNING: For your safety, the information in this manual must be followed to minimize the risk of fire or explosion, or to prevent property damage, personal injury, or death. – Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. – WHAT TO DO IF YOU SMELL GAS: • Do not try to light any appliance. • Do not touch any electrical switch; do not use any phone in your building. • Clear the room, building, or area of all occupants. • Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions. • If you cannot reach your gas supplier, call the fire department. – Installation and service must be performed by a qualified installer, service agency, or the gas supplier. In the State of Massachusetts, the following installation instructions apply: ■ 2 ■ Installations and repairs must be performed by a qualified or licensed contractor, plumber, or gasfitter qualified or licensed by the State of Massachusetts. If using a ball valve, it shall be a T-handle type. ■ A flexible gas connector, when used, must not exceed 3 feet. IMPORTANT SAFETY INSTRUCTIONS WARNING: To reduce the risk of fire, electric shock, or injury to persons when using the dryer, follow basic precautions, including the following: ■ ■ ■ ■ ■ ■ ■ ■ Read all instructions before using the dryer. Do not place items exposed to cooking oils in your dryer. Items contaminated with cooking oils may contribute to a chemical reaction that could cause a load to catch fire. Do not dry articles that have been previously cleaned in, washed in, soaked in, or spotted with gasoline, drycleaning solvents, or other flammable or explosive substances as they give off vapors that could ignite or explode. Do not allow children to play on or in the dryer. Close supervision of children is necessary when the dryer is used near children. Before the dryer is removed from service or discarded, remove the door to the drying compartment. Do not reach into the dryer if the drum is moving. Do not install or store the dryer where it will be exposed to the weather. Do not tamper with controls. ■ ■ ■ ■ ■ ■ ■ Do not repair or replace any part of the dryer or attempt any servicing unless specifically recommended in this Use and Care Guide or in published user-repair instructions that you understand and have the skills to carry out. Do not use fabric softeners or products to eliminate static unless recommended by the manufacturer of the fabric softener or product. Do not use heat to dry articles containing foam rubber or similarly textured rubber-like materials. Clean lint screen before or after each load. Keep area around the exhaust opening and adjacent surrounding areas free from the accumulation of lint, dust, and dirt. The interior of the dryer and exhaust vent should be cleaned periodically by qualified service personnel. See installation instructions for grounding requirements. SAVE THESE INSTRUCTIONS IMPORTANT: The gas installation must conform with local codes, or in the absence of local codes, with the National Fuel Gas Code, ANSI Z223.1/NFPA 54. The dryer must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70. 3 INSTALLATION REQUIREMENTS WARNING Local codes and ordinances that exist must also be met. Consult your local building inspector for more information. Improper venting can cause moisture and lint to collect indoors, which may result in: Moisture damage to woodwork, furniture, paint, wallpaper, carpets, etc. Housecleaning problems and health problems. Fire Hazard Use a heavy metal vent. Do not use a plastic vent. Do not use a metal foil vent. Failure to follow these instructions can result in death or fire. WARNING: To reduce the risk of fire, this dryer MUST BE EXHAUSTED OUTDOORS. 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 pressure specifications, measured at the connection between the vent system and the dryer’s vent pipe, for use in the design of dryer vent systems. Whirlpool does not design multidryer vent systems, nor does Whirlpool review or provide approvals for vent systems designed by third-party engineering firms. Moisture 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 source, reducing the dryer’s efficiency. Exhausting moisture into the room can also cause damage to walls, floors, picture hangers, and cause condensation on windows and walls in cold weather. Lint 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. Heat 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. Outside Exhaust The four basic reasons for exhausting a dryer outdoors are detailed in this section: 1. To meet codes requirements. 2. To remove moisture from laundry area. 3. To avoid lint accumulation in laundry area. 4. To remove excess heat from laundry area. Codes Requirements The following codes should be reviewed to ensure dryer vent systems are in compliance: 1. International Mechanical Code: In the 2000 version, sections 504 and 913. 2. International Fuel Gas Code: In the 2003 version, section 614. 3. UL 2158 Electric Clothes Dryer Standard references venting requirements in paragraph 7.3. 4. ANSI Z21.5.1 - Gas Clothes Dryers. 5. Other sections of these codes may also apply to multi-dryer vent systems. 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 Central Exhaust System Requirements The following guidelines should be considered in the design of any central exhaust system: ■ Exhaust individual dryers to the central exhaust duct system with proper size vents to assure adequate performance of each dryer. The dryer has 4" (102 mm) exhaust duct connections. Four inch (102 mm) diameter aluminum vent should be used to connect each dryer to the central vent. ■ Install weighted dampers on each individual dryer exhaust duct. These dampers may be used for balancing out the overall duct system. ■ Provide for a maximum of 0.1" (2.5 mm) of water column vacuum in the central exhaust duct and a maximum of 0.6" (15 mm) of water column back pressure at the connection of each dryer exhaust vent at any time that the dryer is in operation. See “Venting Requirements” for instructions on how to measure water column back pressure. ■ Design the central duct system for sufficient capacity to handle the maximum number of dryers operated at one time. ■ Consider moisture, lint and air temperature in the design of the central duct system. Maximum exhaust temperature of the dryer will not exceed 200°F (93.3°C) when the dryer is operated according to the instructions provided with the dryer. ■ Provide for periodic inspection and clean-out of lint accumulated in the central duct system. 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. C D 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 B A E 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 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. 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]). 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. 5 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. E B C D A D 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 6 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 DRYER INSPECTION AND CLEANING Frequency of Exhaust System Cleaning Inspecting the Exhaust System 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 annual inspection is recommended. In commercial usage or in multiple dryer systems a more frequent inspection is recommended. Complaints of long drying times or a hot dryer top indicate the need for inspection of the exhaust system. 1. Disconnect the exhaust duct from the dryer and from the exhaust hood (at the exhaust outlet). 2. Inspect the interior of the duct and remove any lint accumulation. ■ Be sure that lint is removed from the exhaust hood. Lint may collect in the exhaust hood so that the flappers or louvers (if installed as part of the exhaust system) will not open or close completely. ■ After cleaning the exhaust hood, check that the flapper or louvers move freely. 3. Reassemble the exhaust duct and hood, checking that the joints are secure. 4. Operate the dryer and verify that the exhaust air is not obstructed in the vent and that there are no leaks in the system. ■ Seal any leaks that are found. 7 W10200920C © 2008. Whirlpool Corporation. All rights reserved. ® Registered Trademark/TM Trademark of Whirlpool, U.S.A. 8/08 Printed in U.S.A.