State Industries STC-074 specifications General Questions and Answers

SBN TANK TYPE COMMERCIAL GAS WATER HEATER

SERVICE HANDBOOK

GENERAL QUESTIONS AND ANSWERS

Q:What is the effect of the draft inducer?

A: The draft inducer has several effects:

•minimizes the excess air through the heater—this often reduces the required vent size

•reduces draft through the heater when it is off

•replaces the draft hood of comparable products

•does not pressurize the vent—common “B” vent materials and the familiar fuel gas codes for venting Category I, fan-assisted, products still apply. Do not combine vent with products that do create a positive pressure vent (Category III or IV).

SBN
Induced		BTR
Draft		Atmospheric	Vent Dia.
Model	Vent	Mocels	(inches)
120	5	120	5
154-390	6	154-275	6
		305-390	8

Q: What is the significance of low NOx (nitrogen oxide)? (SBN Models)

A:Currently, only Southern California and Texas have adopted rules to reduce the NOx emissions under Rules 1121 and 1146.2, but more of California and Texas are expected to implement this requirement in 2001. Ground-level ozone from man-made pollution is a major ingredient in smog. NOx is a contributor to this ground-level ozone formation. The boilers and water heaters affected by Rule 1121 and 1146.2 release about 14 tons of NOx emissions into the air each day. By comparison, approximately the same quantity of NOx is emitted by 288,000 typical passenger vehicles daily. It is estimated that a full implementation of this emissions rule will reduce NOx by about 11 tons daily.

These emission requirements are expected to be implemented by other cities and states soon. The rules apply to natural gas water heaters and boilers.

Technical Training Department 43 ©2003

Ashland City, Tennessee