Williams 400, 250 User Manual

A compact, efficient

and versatile heating

system for add-on

rooms, apartments and

homes!

Williams’ “through-the-wall or through-the­window” gas furnace is an unobtrusive,
self-contained direct-vent system that
installs easily and quickly using a unique
slide-in/slide-out chassis. This design
feature also makes servicing easy.

Compact

Heating System

The quiet centrifugal blower system
delivers warmth evenly throughout the
room. Our compact system offers heating
comfort and economical operation.

Window installed models can be
conveniently removed during the cooling
season.

Compact

Heating

System

installed in

window

Design Features

 Compact design saves living space
 Great for additions, apartments and propane

models are approved for mobile homes

 Thermostat mounts on wall or unit
 Front or rear gas connection increases installation

flexibility

 Dependable solid state ignition
 Automatic temperature and safety controls
 Natural and propane gas models

Compact Heating System

Model Number

Natural Propane Thermal AFUE

2503532 2503531 19,250 77.0 76.0

4003532 4003531 30,800 77.0 76.0

Btu/hr Input

Rating

25,000

40,000

Btu/hr Output

Rating

Features

Unique, Self-Contained Direct-Vent System

With either wall or window installation, the Compact Heating System
requires no chimney or flue pipe. The sealed combustion system uses
only outside air, and the exhaust gases are discharged directly to the

Efficiency Percentages

There's a Model for
Your Space Heating Needs

Furnace dimensions and easy installation allow for placement and operation
through most windows and exterior walls. Consult this drawing and chart below
for sizes.

Type

of

Control

Gas

Connection

24V Wall ⅜"

⅜"

Shipping Weight

(lbs.)

65

9824V Wall

Easy Installation
Through-the-Wall or Through-the-Window

The Compact Heating System offers
exceptional installation flexibility found in
no other direct-vent product. With unique
slide-in/slide-out chassis, it moves easily into
a window or wall opening with only
electrical and gas hookups required. Fuel
connection can be made on either the front
(interior) or rear (exterior) of the unit, giving
you a choice of installation.

Williams compact design incorporates an
attractive front grille that extends only 3¼
inches into the room, saving valuable
interior space.

The 250 Series Models fit between standard
16" O.C. studs with no structural changes
needed. Slide-out chassis design facilitates
servicing.

Dimensions and Clearances

All models, top, bottom and sides 0", rear 36".

All models, top to ceiling 12", adjacent side wall 12", front 8', floor 6" (2" if noncombustible).

Cabinet Clearances

Grille Clearances

Wall Opening Size

25,000 Btu/hr models: 14¼"W x 13⅝"H

40,000 Btu/hr models: 20-5/16"W x 14 ⅜"H

250 West Laurel Street · Colton, California 92324 USA
[phone] · Fax: [phone] or [phone]
Consumer Line: [phone]
Homeowner Assistance: [phone]
www.e-wfc.com

Model A B C D E F

250 Series 16⅛" 15-3/32" 23⅝" 14-1/16" 13-1/16" 3-5/32"

400 Series 21¾" 15-3/32" 23⅝" 20-1/16" 14-3/16" 3-5/32"

How to Select the Right Model

Use the chart shown to determine the appropriate model to provide proper
heating capacity for your square footage.

Amount of Insulation

Model

250 Series

400 Series

Well Insulated

1,225 sq. ft. 825 sq. ft.

2,050 sq. ft.

Important

· Read owner's manual before using/installing.

· Photographs are representative.

· Check local codes and ordinances for permitted uses.

· Consult installation manual for clearances prior to installation.

· We reserve the right to amend product specifications without notice.

· Installation and servicing recommended by a qualified service person.

· New York approval MEA117-77-E11.

· Minneapolis certificate of approval number 5787.

· Please read the warranty for any limitations for disclaimers.

· Combustion chamber carries a five-year limited warranty. All other

parts carry a one-year limited warranty.

Average

Insulation

1,350 sq. ft.

Poor

Insulation

625 sq. ft.

1,000 sq. ft.

© 2008 Williams Furnace Co. Printed in U.S.A. All Rights Reserved Subject to Change without Notice L1136 5/08