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READ CAREFULLY BEFORE INSTALLING UNIT
These installation instructions are a general guide, and do not supersede applicable local codes and ordinances. Before planning or
making the installation, be sure it complies with all phases of the local heating codes. Or, in the absence of local codes, with the latest
edition of the National Fuel Gas Code, ANSI.Z223.1. In Canada, see the current installation code CAN1-B149.
The appliance, when installed, must be electrically grounded in accordance with local codes or, in the absence of local codes, with
the latest edition of the National Electrical Code ANSI/NFPA No. 70. In Canada, see the current Canadian Electrical Code
C5AC22.1.
The ANSI standards are available from the American Gas Association, 1515 Wilson Blvd., Arlington, Virginia 22209.
The NFPA standards are available from the National Fire Protection Association, Batterymarch Park, Quincy, MA. 02269.
Canadian standards are available from International Approval Services,178 Rexdale Blvd.,Etobicoke,Ontario, Canada M9W 1R3.
NOTE: If optional rear register kit is to be used, see supplemental installation instructions (No. 84504) and section marked
“Special Instructions for Rear Register Kit Application” prior to installation of Rough-In.
INTRODUCTION
THIS IS A GAS-FIRED, GRAVITY VENTED WALL FURNACE THAT WILL OPERATE SAFELY AND PROVIDE AN
EFFICIENT SOURCE OF HEAT WHEN INSTALLED, OPERATED AND MAINTAINED AS RECOMMENDED IN THESE
INSTALLATION AND OPERATING INSTRUCTIONS. READ THESE INSTRUCTIONS THOROUGHLY BEFORE
INSTALLING, SERVICING, OR USING THE APPLIANCE. IF YOU DO NOT UNDERSTAND ANY PART OF THESE
INSTRUCTIONS, CONSULT LOCAL AUTHORITIES, OTHER QUALIFIED INSTALLERS, SERVICE AGENCIES, THE GAS
SUPPLIER OR THE MANUFACTURER.
SPECIFICATIONS
Your vented wall furnace comes packed in a single carton. (For wall thermostat models that includes the thermostat, thermostat
wire, and insulated staples). Before installing the wall furnace check the rating plate to verify that the Model Number is correct
and that the wall furnace is equipped for the type gas you intend to use.
Model Type Type BTU/Hr. Vent Gas Shpg. REAR REG. KIT FAN KIT
No. Control Gas Input Size Inlet FINISHED DIMENSIONS Wt. Model Weight Model Wt.
SINGLE WALL FURNACE
W251F Snap Bulb Nat. 25,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 90 Lbs. 40542 5 Lbs. WFF81 10 lbs.
W255F Wall Stat Nat. 25,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 90 Lbs. 40542 5 Lbs. WFF81 10 lbs.
W252F Snap Bulb L.P. 25,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 90 Lbs. 40542 5 Lbs. WFF81 10 lbs.
W256F Wall Stat L.P. 25,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 90 Lbs. 40542 5 Lbs. WFF81 10 lbs.
W351F Snap Bulb Nat. 35,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 90 Lbs. 40542 5 Lbs. WFF81 10 lbs.
W355F Wall Stat Nat. 35,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 90 Lbs. 40542 5 Lbs. WFF81 10 lbs.
W352F Snap Bulb L.P. 35,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 90 Lbs. 40542 5 Lbs. WFF81 10 lbs.
W356F Wall Stat L.P. 35,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 90 Lbs. 40542 5 Lbs. WFF81 10 lbs.
DUAL WALL FURNACE
W501F Snap Bulb Nat. 50,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 134 Lbs. N/A N/A WFF81 10 lbs.
W505F Wall Stat Nat. 50,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 134 Lbs. N/A N/A WFF81 10 lbs.
W502F Snap Bulb L.P. 50,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 134 Lbs. N/A N/A WFF81 10 lbs.
W506F Wall Stat L.P. 50,000 4” 1/2” 16-1/2”Wx68”Hx6-1/2”D 134 Lbs. N/A N/A WFF81 10 lbs.
One or two fan kits may be used on dual-wall furnace.
CONTENTS
Page 2
Introduction................................................ 2 Rear Register Kit Instructions.................................... 9
Specifications.............................................. 2 Lighting Instructions................................................... 10/11
Safety Rules................................................. 3 Pilot Adjustment........................................................... 12
Clearances.................................................... 3 Burner Flame Adjustment............................................ 12
Controls........................................................ 3 Maintenance Instructions........................................... 12
Combustion & Ventilation Air................... 4 WFF81 Fan Instructions.............................................. 13/14
Venting.......................................................... 5,6 Trouble Shooting Chart................................................ 15/16
Rough-In Instructions................................ 6 Parts Drawing................................................................ 17
Installation.................................................... 8 Parts List........................................................................ 18
Wiring Instructions..................................... 9 Warranty........................................................................ 20