Schwank 2-Stage Series - Manual (Page 26)

26
SET(U)-F / ITT(U)-F Manual
IM091221
RD: FEB 2014
RL: 8B
12. COMBUSTION AIR DUCTING
Do not install filters on the combustion air intake. Ensure adequate clearance around
the air intake to allow sufficient combustion air supply to the heater.
This heater requires optional 4” Fresh Air Intake Adapter JS-0532-SE to connect an out-
side combustion air duct.
An opening is located on the top surface of the burner housing for combustion air . Ensure
adequate clearance around this opening to allow sufficient combustion air supply to the heater.
Combustion air duct must be constructed of noncombustible material.
When a tube heater is operated in a negative air condition or air-born dust or contaminants are
present as in woodworking and welding shops, air for combustion must be ducted from outside
the negative or contaminated area to the 4 inch (10 cm) diameter intake flange supplied on the
blower. Maximum system, vent and duct length is listed above.
 The total system length and individual flue vent or the combustion air duct is not to ex-
ceed the lengths listed above
 Total combined system length is reduced by five feet for every 90° elbow installed in the
vent or duct and in the tube system (see above for allowable total lengths)
 Exceeding the allowable lengths may create condensation or soot conditions and will void
CSA Design Certification and product warranty
The air intake will not be located less than:
 Three feet above grade
 Twelve inches from flue vent terminal of any heater with input up to 100,000 Btu/hr
 Three feet from flue vent terminal of any heater over 100,000 Btu/hr
This heater has an optional fresh air intake duct hood for wall (JS-0532-VC) or roof cap (JS-
0530-XX) to bring combustion air to the heater from outside. Ensure adequate clearance
around the air intake to allow sufficient combustion air supply to the heater. If drawing fresh air
from outside, it is recommended that any single wall pipe containing cold air be insulated to
prevent or reduce condensation on the pipe.
Do not use flexible dryer hose or any ‘soft wall’ tubing for air inlet duct, the corrugated sides
of this tubing restrict air flow. A good quality industry approved insulated flex is allowed.
CAUTION: In locations where chlorinated Hydrocarbons are in use, such as Trichloroethyl-
ene or Chloroethylene Nu it is essential that combustion air be brought in from
a non-contaminated area. Burning the fumes from these gases will create Hy-
drochloric acid fumes, which are detrimental to humans, equipment and build-
ings. Typical sources of other contaminants are paint removers, paints, refriger-
ants, solvents, adhesives, degreasers, lubricants, pesticides, etc.
The heater manufacturer cannot anticipate all types and chemical composition of
possible contaminants at project sites. Confer with project site safety, health and
engineering staff and/or local authorities having jurisdiction such as the Fire Mar-
shall and Department of Labor for possible contaminants and any conflict with the
installation of hot surface heating equipment.