Williamson-Thermoflo SCH High Boy, Manual Manual, Page: 3 / 39

SCH & SCL
Oil Furnaces
– Furnace Manual
670-000-006-1007
3
1 Prepare furnace location
Pre-installation checklist
Verify code compliance
‰
Local, state, and national codes, laws, regulations and
ordinances
‰
NFPA-31, Installation of Oil-Burning Equipment
‰
National Electrical Code
‰
All local codes and/or regulations take precedence over the
instructions in this manual and should be followed accordingly.
SCH & SCL furnaces, their burners and controls have
met safe lighting and other performance criteria when
they underwent tests, specified in Underwriters
Laboratories Standard UL727.
Check location and furnace specifications
‰
Furnace heating capacity
‰
Space is large enough to provide required clearances
Verify the installation will meet the requirements of this manual:
‰
Clearances (page 3)
‰
Combustion/ventilation air openings (page 4)
‰
Supply air duct (page 7)
‰
Return air duct (page 7)
‰
Vent system (page 9)
‰
Fuel oil piping (page 15 plus burner manual)
‰
Electrical connection (page 15)
Clearances
Minimum clearances to combustible materials
1.
Install the furnace, ductwork and vent such that no combustible
surface is closer than indicated in Table 1.
Flue pipe clearances must take precedence over
jacket clearances (listed below).
Service accessibility clearances
1.
Provide no less than the minimum clearances given in Table 1 to
ensure the furnace can be properly operated, serviced and
maintained.
2.
Always apply whichever clearance is LARGER – combustible
construction or service accessibility.
NOTICE
NOTICE
Flooring and foundation
Flooring
SCH & SCL furnaces are approved for installation on combustible
flooring, but must never be installed on carpeting.
Do not install furnace on carpeting even if foundation
is used. Fire can result, causing severe personal
injury, death or substantial property damage.
Foundation
1.
Provide a solid brick or minimum 2 inch thick concrete
foundation pad if any of the following is true:
•
the floor can become flooded.
•
the furnace mounting area is not level.
Residential garage installations
Take the following special precautions when installing the furnace in
a residential garage. Il the furnace is located in a residential garage:
•
Mount the furnace a minimum of 18 inches above the floor
of the garage.
•
Locate or protect the furnace so it cannot be damaged by a
moving vehicle.
Table 1 Minimum clearances
WARNING
Minimum clearances from furnace, ductwork and vent
SCH-105 (3” vent dia.) SCH-160 (4” vent dia.) SCL-105 (3” vent dia.) SCL-160 (4” vent dia.)
Service accessibility clearances are
recommended minimum dimensions to
allow access to furnace components
(motor, blower, filters, etc.)
To
combustible
construction For
service
accessibility To
combustible
construction For
service
accessibility To
combustible
construction For
service
accessibility To
combustible
construction For
service
accessibility
Side of furnace or supply plenum
1"
24"
(one side)
1"
24"
(one side)
1"
24"
(one side)
1"
24"
(one side)
Rear of furnace 1" 24" 18" 24" 1" 24" 18" 24"
Top of furnace casing or supply
plenum (warm-air duct within 6 ft. of
furnace)
1" --- 2" --- 1" --- 2" ---
Bottom of furnace
0" --- 0" --- 0" --- 0" ---
Front of furnace 1" 24" 24" 24" 1" 24" 24" 24"
Flue pipe
R
EFER TO
S
ECTION
4 (V
ENTING
)
3