Raypak 1000 Operating And Installation Manual page 27

SECTION J: VENTING CONNECTIONS
GENERAL
CAUTION: Proper installation of flue exhaust venting is critical for the safe and efficient operation of the boiler.
For vent systems not shown in this section please contact your local authorized representative.
Definition of Appliance Categories
Boilers are divided into four categories based on the pressure produced in the exhaust and the likelihood of condensate
production in the vent.
Category I.
ture that avoids excessive condensate production in the vent.
Category II.
ture that may cause excessive condensate production in the vent.
Category III.
avoids excessive condensate production in the vent.
Category IV.
may cause excessive condensate production in the vent.
See Table J-1 for vent category requirements for the Advanced Design Boiler
Note: For additional information on appliance categorization, see appropriate ANSI Z21 Standard and the latest
edition Standard of National Fuel Gas Code or in Canada, the latest edition of CGA Standard B149 Installation
Code for Gas Burning Appliances and Equipment, or applicable provisions of local building codes.
Determination of Appliance Category for Venting Purposes and Venting Arrangements
WARNING: Contact the manufacturer of the vent material if there is any question about the appliance categori-
zation and suitability of a vent material for application on a Category III or IV vent system. Using
improper venting materials can result in personal injury, death or property damage.
A boiler which operates with a non-positive vent static pressure and with a vent gas tempera-
A boiler which operates with a non-positive vent static pressure and with a vent gas tempera-
A boiler which operates with a positive vent pressure and with a vent gas temperature that
A boiler which operates with a positive vent pressure and with a vent gas temperature that
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