Schwank STW-JZ1 - Manual (Page 30)

30
STW-JZ / IW I&O Manual
IM101229
RL: 12A- BA
RD: DEC 2010
11A. Combined Length of Vent and Combustion Air Duct:
 The individual flue vent or the combustion air duct is not to exceed 50 ft in length.
 Inputs: 130, 155, 175, and 200 Mbh: 80 feet maximum combined vent & duct
 Inputs: 45, 60, 80, 100, and 110 Mbh: 50 feet maximum combined vent & duct
 Total combined vent and duct is reduced by ten feet for every 90° elbow installed in the
vent or duct, and in the tube system
 Exceeding the allowable lengths noted above may create condensation problems and will
void CSA Design Certification and the heater warranty.
V ERTICAL VENT THROUGH THE ROOF :
It is the sole responsibility of the installer to ad-
here to all current local codes and/or ANSI
Z223.1 / CSA.B149.1 latest editions for all
venting requirements, and practices.
 Use an approved ‘B-vent’ termination cap
as supplied by the manufacturer of the ap-
proved ‘B-vent’.
 When vent and combustion air are taken
through the roof, the exhaust vent should
always terminate higher than the combus-
tion air intake, to prevent recycling the
products of combustion back into the
heater.
Approved
Cap
Approved
‘B’ Vent
24”
60 cm
12
9
If roof slope exceeds 9:12
consult NFPA-54 ANSI
Z223.1 or CSA-B149.1
12. COMBUSTION AIR DUCTING
An opening is located on the top surface of the burner housing for combustion air . Ensure ade-
quate 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 vent and duct length is:
 The individual flue vent or the combustion air duct is not to exceed 50 ft in length.
 Inputs: 130, 155, 175, and 200 Mbh: 80 feet maximum combined vent & duct
 Inputs: 45, 60, 80, 100, and 110 Mbh: 50 feet maximum combined vent & duct
 Total combined vent and duct is reduced by ten feet for every 90° elbow installed in the
vent or duct and in the tube system.
 Exceeding the allowable lengths noted above may create condensation problems and will
void CSA Design Certification and product warranty.
continued ...
FIGURE 19
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