Owner`s manual

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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.

VERTICAL 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

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