GE Clothes Dryer User manual

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RULES FOR BEST PERFORMANCE

Best Performance Means

•Safety

•Faster Drying Times

•Less Energy Consumption

•Longer Dryer Life –Less Dryer Wear

•Longer Clothes Life –Less Clothes Wear

•Make sure to refer to the installation instructions specific to the dryer model being

installed (get copy from Sales Rep: 1-800-361-3400).

•Use 240 volts. 208 volts increases drying time by about one third.

•Use 4” metal ducting. Never use plastic ducting. It increases dry time, traps lint

and may be a fire hazard. See page 3.

•Use 4” wall caps.See Page 4

•Use louvered doors for closet installations to get sufficient air to dryer. See Page 6

•Do not use screens in vents. Screens clog with lint and become safety

hazard…….. Page 4.

•Minimize total exhaust duct length…..Page 4.

•Minimize 90-degree turns. Use 45 degree turns instead of 90 degree turns when

possible……Page 5.

•Leave 4’ minimum between turns and bends when possible….Page 5.

•Secure all joints with fasteners that do not extend into ductwork. Screws trap lint.

Seal all joints with duct tape…..Page 6.

•Insulate ducting that will be in a cool ambient during drying to prevent

condensation accumulation….Page 7.

•Use a minimum of 1/8” per foot (10mm per meter) pitch on horizontal ducting

runs, when possible, to prevent any condensate from accumulating in

ducting....Page 7.

Section 1----- General Information Page 4

Section 2----- Multi-Unit Installation Page 9

THERE IS A NEED FOR

ACCURATE INFORMATION

The variety of floor plans and laundry

locations, coupled with an increasing

number of building codes and

restrictions, indicates a need to advise

planners well in advance of installation

about exhaust requirements and other

pertinent information. This is especially

true in multi-family construction.

Failure to comply with the

manufacturer’s recommendations when

installing a washer and dryer can void

warranty provisions, cause local

authorities to refuse to grant a certificate

of occupancy, or may even result in legal

liability should the user experience

personal or property damage as a result

of the installation.

GOOD PRACTICE IN

EXHAUSTING DRYERS

An inadequate or improperly installed

dryer exhaust system will, at the very

least, result in a loss of drying

performance and an excess energy

consumption.

All dryers must be exhausted to the

outdoors. When the dryer is in operation,

the warm humid air passes thorough the

dryer lint filter where the lint is

collected. Fine particles of lint will pass

through the lint screen and will be

pushed through the exhaust duct to the

outdoors. If outdoors exhausting is not

provided, this lint and moist air will be

exhausted into the room. This condition

could create undesirable effects

including:

•Aggravating allergic conditions

•Sweating of cold water pipes,

windows and walls

•Rusting of metal

•Peeling of paint

•Loosening of wall paper

The indoor exhausting also affects dryer

performance, since it re-circulates highly

humid air from the room. It usually

results in longer drying times.

Index

SECTION ONE

The Exhaust Requirements

Minimizing the length of ductwork and the number of turns in an exhaust system

minimizes the potential for lint to settle and accumulate in the exhaust duct and in the

interior cabinet of the dryer. Refer to your specific dryer installation instructions for

recommended permissible maximum duct length.

1. Wall Caps and other Terminations

All exhaust systems must be terminated in a manner that will prevent back drafts from

outdoors as well as prevent birds or other wildlife from building nests or taking refuge in

the ductwork. The wall cap should present minimal resistance to the flow of exhaust air

and should prevent lint and water accumulation and prevent clogging.

The preferred termination is either a dampered wall cap having a 4” wide opening

or a movable louvered wall cap.

A two and a half inch wall cap resists airflow and increases drying time. It must be

installed with the opening down and should be installed at a minimum of 12 inches above

ground level or any other obstruction. Special consideration should be given in areas

where heavy snowdrifts are likely to occur to ensure the wall cap does not become

obstructed. Other types of terminations, such as roof vents or louvered plenum chambers,

are acceptable providing they are equivalent to the 4” dampered wall cap. They must

contain at least 14 square inches of ventilation area and afford adequate protection

against back drafts

The dryer exhaust must not terminate in an ordinary chimney, under an enclosed house

floor or crawl space, or into an attic, since any accumulated lint could create a fire hazard

and the moisture could cause damage. Never terminate the exhaust into the common

duct or plenum with a kitchen hood exhaust since the combination of grease and lint

could create a fire hazard.

Exhaust ducts

must not contain screens or other filtering devices

anywhere along

their full length. They become clogged with lint and become a safety hazard.

2. Separation of turns in the ductwork

All turns in the exhaust system, external to the dryer itself, including the distance from

the last turn to the dampered wall cap, should be separated by at least 4 feet of straight

metal duct. This requirement will reduce the added resistance to airflow, which results

from rapid changes of airflow direction inside the ducting.

If two turns must be closer than 4’, deduct 10’ from the maximum lengths shown in.

3. Treatment of turns other than 90 degrees

One turn of 45 degrees or less may be ignored. Two such turns should be treated as one

90-degree. Each turn over 45 degree should be treated as one 90 degree. Refer to specific

dryer installation for maximum duct lengths and for allowable 90 degree bend.

Note: Some dryers are limited to only rear exhausting. Consult the installation

instruction for the type of dryer being used.

4. Use of Flexible metal ducting

We recommend the use of 4” diameter rigid metal ducting. Flexible ducting is

susceptible to unforeseen restrictions, turns or kinks. However, if flexible metal

ducting must be used, the following precautions must be adhered to:

a. Use only 4” diameter metallic flexible ducting.

b. Never use foil or other thin ducting that can be easily punctured with a

screwdriver or nail.

c. The flexible duct must not be allowed to collapse, kink or sag when the

dryer is pushed to its final installed position. It is suggested that required

turns in the exhaust system be made with rigid elbows.

d. Minimize ducting length. Don’t exceed the maximum allowable duct

lengh specified in the installation instructions. Account for all bends.

e. To reduce the risk of fire, NEVER USE FLEXIBLE PLASTIC OR

OTHER COMBUSTIBLE DUCTWORK.

5. Sealing of joints

All duct joints should avoid leaks. Duct joints should be made air and moisture tight by

wrapping the overlapped joints with duct tape. The male ends of each section of duct

should point away from the dryer. Do not assemble the ductwork with screws or other

fasteners that extend into the duct. They will serve as a collection point for lint.

6. Air Supply to Dryer

ALL DRYERS NEED A GOOD SUPPLY OF AIR (UP TO 160 CFM) TO

OPERATE PROPERLY.

•ALCOVE OR CLOSET INSTALLATION

Minimum clearances are required between dryer cabinets, adjacent walls, overhead

cabinets, ceilings and other combustible surfaces. Consult specific dryer installation

instructions for requirements.

Consideration must be given to provide adequate clearances for air supply,

installation, servicing and cleaning.

Closet doors must be louvered or otherwise ventilated and must contain at least 60

square inches of open-air passage area. If the closet contains both a washer and a

dryer, doors must contain 120 square inches of open-air passage.

•REGULAR DRYER INSTALLATION

When installed in closed laundry room, leave gap at bottom of door to allow air inlet for

proper operation of dryer.

Ventilated Closet Door

7. Water Condensation

The condensation of water in a dryer exhaust system is caused by the moisture in the

exhausted air contacting the cold inner surfaces of the ductwork. Condensation, which

forms at the beginning of the drying cycle, will dissipate quickly after the ductwork

becomes heated. However, if the ductwork passes through an area, which keeps it cool

throughout the drying cycle, considerable condensation can be expected. This can result

in a rapid accumulation of lint in the ductwork.

Ductwork, which runs through an unheated area or which is situated adjacent to an air

conditioning duct should be insulated to avoid such condensation problems. All joints

should be tight to avoid leaks and, where feasible, the duct should be sloped at least 1/8”

per foot (10 mm per meter) towards outdoors.

8. Accessibility for cleaning

Since it may be necessary from time to time to remove lint from the inside of the

ductwork, it is important that the exhaust system be installed with a provision for periodic

inspection and cleaning. Some provision should be made for access to turns and straight

runs of duct installed in an enclosed area, such as above plastered ceilings. Special

consideration should be given to the amount of maintenance required for roof caps on

vertical installations, since the user cannot be expected to make frequent inspections or

cleanings.

9. In Line Exhaust (Booster) Fans

•Use of In Line exhaust (booster) fan for single unit installation is not

recommended:

-Operator may forget to turn it on

-It may block

-It may fail without operator noticing it.

•For multi-unit installation, refer to Section II of this booklet

Single Family-type Dwellings

For more detailed information, refer to the installation instructions for the specific dryer

model selected.

Mobile or Manufactured home installation

Gas Dryer installation must conform with local Gas Codes and with CGA B149.1 or

B149.2 (Installation code for Gas Burning Appliances and Equipments).

All Dryers Installation must conform to Manufactured Home Construction and Safety

Standard, Title 24 CFR, Part 32-80.

The dryer MUST be exhausted to the outdoors with the termination (wall cap, etc.)

securely fastened to the mobile home structure.

The exhaust MUST NOT be directed underneath the mobile home.

Multi-Unit Installation

Multi-Unit Systems

Accurate installation of a good dryer exhaust system in multi-family construction is

especially important. The exhaust ducting restrictions applied by this type of construction

should cause the planner to be more concerned than in single-family construction.

When the total length of the exhaust duct or the number of turns in the system exceed the

maximum limitations recommended by the dryer manufacturer, the planner must seek an

alternate solution. One solution could be to install a common ducting system that is

capable of handling the discharge of several dryers at various points along the system.

The scope of the subject is far to broad to be extensively described within this

publication. Sufficient information is presented, however, to make the planner aware of

the importance of special attention to the subject.

Two types of common ducts are generally used: (1) the common fan assisted dryer

exhaust stack (with an auxiliary roof fan); and (2) the chimney type common dryer

exhaust.

Fan assisted stack and chimney designs must meet all local code requirements. It is

suggested that professional engineering counsel should be sought in these matters.

It is suggested that dryers be installed as close to the common duct as possible.

Dryers discharges must be offset to prevent one unit from exhausting directly into

another.

See Illustration No.1.

Illustration No.1.

Section 2

Common Fan Assisted Dryer Exhaust Stack

(Auxiliary Roof Fan Systems)

The stack outlet (see Illustration No.2) must be fitted to a continuous duty exhaust fan

rated to handle the stack air volume for the total number of dryers on the system. Periodic

cleaning of the exhaust fan is necessary to maintain efficient operation.

The bottom of the stack should contain a barometric damper to prevent drawing air

through the dryers not in use, and a lint cleanout access door. The damper should be

adjusted to just open with all dryers on and the continuous duty exhaust fan operating.

The weighted damper in the individual dryer ducts should be adjusted so that it will just

close with all dryers off and the continuous duty exhaust fan operating. The fan should be

running all the time.

The duct system from each individual dryer must meet the turn and length requirements

noted in Section 1.

The required stack diameter for air volumes of 200 CFM to 3000 CFM can be determined

from Illustration No.3 and calculations on Page 11.

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