Williamson-Thermoflo SCH High Boy, Manual Manual

670-000-006-1007  

Sealed Combustion Oil Furnaces 

SCH  High Boy 
SCL  Low Boy

Furnace Manual 

Contents

Page

Read this first! ............................................................................ 2 

1.

  Prepare furnace location............................................................ 3 

2.

  Prepare furnace and place in position ....................................... 5 

3.

  Connect supply and return ducts ............................................... 6 

4.

  Venting – Sealed Combustion System ...................................... 9 

5.

  Connect fuel oil piping.............................................................. 15 

6.

  Wire furnace and burner .......................................................... 16 

7.

 Start-up .................................................................................... 18 

8.

 Checkout 

procedure................................................................. 19 

9.

 Troubleshooting ....................................................................... 21 

10.

  Service and maintenance ........................................................ 22 

11.

  Components and replacement parts........................................ 25 

12.

  Dimensions and ratings ........................................................... 34 

13.

 Owner’s information ................................................................. 38 

Hazard definitions 

Hazards that 

will cause severe

 personal injury, 

death or substantial property damage. 
 
Hazards that 

can cause severe

 personal injury, 

death or substantial property damage. 

 
Hazards that 

will or can cause minor

 personal 

injury or property damage. 

KEEP THESE INSTRUCTIONS 

WITH FURNACE FOR FUTURE 

REFERENCE.

CAUTION 

DANGER 

 
Special instructions on installation, operation or 
maintenance that are important but not related to 
personal injury or property damage. 

WARNING 

NOTICE 

INSTALLER 

– Read all instructions before 

installing. 

Read page 2 first.

 Follow all instructions 

in proper order to prevent personal injury or death. 

•

  Consider ducting, fuel supply, venting and 

installation when determining furnace location. 

•

  Any claims for damage or shortage in shipment 

must be filed immediately against the transportation 
company by the consignee. 

Do not store or use gasoline or other flammable 
liquids or vapors near this furnace or any other 
appliance. 

Ventilate house while operating furnace for the first 
time. Odors may be emitted for a brief period. 

Do not alter this furnace in any way. The 
manufacturer will not be liable for any damage 
resulting from changes made in the field to the 
furnace or its components or from improper 
installation. Failure to comply could result in severe 
personal injury, death or substantial property 
damage. 

USER – Please read the following. Failure to 
comply could result in severe personal injury, death 
or substantial property damage. 

•

This manual is for use only by your qualified 
heating installer / service technician.

•

Please see the 

Owner’s information

 only, on back 

page of this manual. 

•

  Have the furnace serviced by a qualified service 

technician, at least annually. 

 
This manual must only be used by a 

qualified 

heating installer / service technician.

 Furnace and 

burner must be installed and serviced only by a 
qualified heating installer / service technician. 
Failure to comply could result in severe personal 
injury, death or substantial property damage. 

When calling or writing about the furnace, please 
refer to furnace model number and serial number 
shown on the rating label. You may list the serial 
number and model number in the space provided on 
the “Installation and service certificate” found on 
page 20. 

WARNING 

WARNING 

WARNING 

WARNING 

CAUTION 

WARNING 

NOTICE