Harsco Industrial MACH C1500GG Installation & Owner's Manual page 13

Category IV
An appliance that operates with a positive vent static pressure and with a vent temperature
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
®
The MACH C1500GG and C2000GG boilers are dual-certified as both Category II and Category IV appliances,
which vent with a temperature that is likely to cause condensation in the vent. Refer to Section 3.5.3.2 for
requirements of Category II installations and Section 3.5.3.3 for requirements of Category IV installations. Any venting
system used with the MACH® boiler must comply with the applicable venting system as specified in the latest edition
of NFPA 54/ANSI Z223.1 in the US or the latest edition of CAN/CSA B-149.1 in Canada.
The venting materials listed below are intended for the venting of gas burning appliances only. Do not
use these venting materials for venting liquid or solid fuel (such as oil, kerosene, wood or coal)
appliances
Maintain clearances to combustibles as listed in the vent manufacturer's installation instructions or as set
forth in the codes and standards listed in this section.
Do not use these vent pipes for incinerators of any sort.
This boiler is not certified for use with PVC nor CPVC venting. Use of PVC
or CPVC vent may result in vent failure and possible serious injury or death.
Table of Acceptable Materials for Venting Systems
Manufactured Venting
US and Canada
Factory Fabricated Metallic Vent Systems listed and labeled to UL1738 (Titled: Venting Systems for Gas-
Burning Appliances, Categories II, III, and IV)
Table of Applicable Vent Materials by MACH® Boiler Model
MACH® Boiler Model
C1500GG – C2000GG
US
C1500GG – C2000GG
CAN
3.5.2 Combustion Air
Combustion air must be free from dust, lint, etc. The presence of such materials in the air supplied to the burner
could cause nuisance "Low Air" shutdowns or premature burner failure. The boiler should not be operated during
construction while the possibility of drywall dust, demolition dust, etc. exists.
The combustion air supply must be completely free of chemical fumes which may be corrosive when burned in the
boiler. Common chemicals which must be avoided are fluorocarbons and other halogenated compounds, most
commonly present as refrigerants or solvents, such as freon, trichlorethylene, perchlorethylene, chlorine, etc. These
chemicals, when burned, form acids which quickly attack the boiler and the boiler stack. The result is improper
combustion and premature boiler failure.
pressure. Particular care should be taken when exhaust fans, compressors, air-handling units or other
equipment may rob air from the boiler. Note that this equipment might be in rooms other than the boiler
room.
AL29-4C 316L SS
X
X
Under no circumstances shall the boiler room ever be under a negative
CPVC
X No
X No
Page 13
MACH® Gas-Fired Boiler
PVC
No
No