Harsco Industrial P-K THERMIFIC N700 Installation & Owners Manual page 12

UL UL 441
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These codes and standards contain information for the venting of gas fired appliances, including, but not
limited to vent sizing, location, clearance to combustibles, and safe installation practices. The installation
must comply with all applicable national, state, provincial and local codes.
and knowledgeable venting systems personnel and in accordance with vent system manufacturer's
installation instructions.
materials can result in serious injury or death due to fire or asphyxiation.
Before connecting a boiler to a venting system, it must be determined whether the boiler is to be
installed in a conventional or Direct Vent configuration
system. Improper vent installations may allow toxic fumes to be released into the living area. This may
cause property damage, serious bodily injury or death.
NOTICE! Failure to use a proper vent system (types and materials), as described in this manual may
void the boiler warranty.
3.5.1.1 Gas Vent Categories
Several codes and standards have categorized appliances in accordance with the flue gas temperature
and pressure produced by the appliance. Categories are defined as follows:

Category I An appliance that operates with a non-positive vent static pressure and with a vent
temperature that avoids excessive condensate production in the vent.

Category II An appliance that operates with a non-positive vent static pressure and with a vent
temperature that may cause excessive condensate production in the vent.

Category III An appliance that operates with a positive vent static pressure and with a vent tem-
perature that avoids excessive condensate production in the vent.

Category IV An appliance that operates with a positive vent static pressure and with a vent tem-
perature that may cause excessive condensate production in the vent.

Direct Vent An appliance that is constructed and installed so that all air for combustion is derived
directly from outdoors and all flue gases are discharged to the outdoors.
3.5.1.2 Venting Materials for Flue/Exhaust Systems
®
P-K THERMIFIC boilers are Category I appliances, as it is defined in NFPA 54/ANSI Z223.1. The P-K
®
THERMIFIC boiler may be vented in accordance with NFPA 54/ANSI Z223.1. Venting material may
include Type "B" gas vent, chimney, single-wall metal pipe, listed chimney lining system for gas venting,
or special gas vent listed for Category I appliances.
death. This boiler is not suitable for use with any type of plastic or non-metallic venting.
In Canada, the boiler is certified for installation with a "Power Venter" by the Canadian Gas Association
when installed with the "listed accessories." Consult your local distributor for information on proper
selection.
Type B Gas Vent (Category I)
Design and installation of venting systems should be done only by qualified
Installing a boiler or vent system using improper installation methods or
Use of improper vent material may result in rapid deterioration of the venting
Use of plastic vent will result in vent failure and may cause serious injury or
P-K THERMIFIC
12
®
Gas-Fired Boiler