Specifications

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10.1 General Considerations
Perform tasks outlined in Section 5 of • freewatt PLUS
boiler Installation, Operation and Maintenance Manual,
section “Removal of Existing Boiler from Common Vent
System” if system will be replacing Category I type
boiler connected to chimney serving other appliances.
Vent installations shall be in accordance with ANSI •
Z223.1/NFPA 54, CSA-B149.1 and B149.2, or authority
having jurisdiction.
Provisions for combustion and ventilation air shall be •
in accordance ANSI Z223.1/NFPA 54, CSA-B149.1 and
B149.2, or authority having jurisdiction.
Hydronic • freewatt PLUS System has two separate
components requiring combustion air and discharge of
combustion products.
Boiler component requires dedicated direct vent •
system. All air for boiler’s combustion is taken
directly from outdoors through combustion air intake
pipe. All combustion products are discharged to
outdoors through vent pipe.
Honda MCHP takes combustion air from interior •
open space and all combustion products are
discharged to outdoors through vent pipe.
See installation instructions in boiler and HONDA MCHP •
manuals for combustion air and vent pipe roof and
sidewall termination (Roof termination is preferred).
Combustion air and vent pipes for freewatt PLUS
Boiler must terminate together in same atmospheric
pressure zone as shown. Boiler and MCHP exhaust
vents need not be in same general location on exterior
of building. Construction through which vent and air
intake pipes may be installed is maximum 24 inches,
minimum ¼” thickness.
Combustion air and vent pipe fi ttings must conform •
to American National Standards Institute (ANSI) and
American Society for Testing and Materials (ASTM)
D1784 (schedule 40 CPVC), D1785 (schedule 40 PVC),
D2665 (PVC-DWV), D2241 (SDR-21 and SDR-26 PVC),
D2661 (ABS-DWV), or F628 (schedule 40 ABS). Pipe
cement and primer must conform to ASTM standards
D2564 (PVC) or D2235 (ABS). In Canada construct
all combustion air and vent pipes for system of CSA or
ULC certifi ed schedule-40 CPVC, schedule-40 PVC, PVC-
DWV or ABS-DWV pipe and pipe cement. SDR pipe is
not approved in CANADA.
Combustion air pipe and vent connections on boiler are •
2” pipe size. Installed combustion air pipe and vents for
boiler must be 3” size and, 2” to 3” pipe coupling must
be used at boiler connections. MCHP vent connection
size is 2”. 2” or 1-1/2” vent size is permitted. Refer
to freewatt PLUS Boiler Installation, Operation and
Maintenance Manual and MCHP IOM for specifi c venting
instructions.
Exhaust transition from 2” pipe to 3” pipe must •
be made in vertical run. Transition pieces are not
included. (See boiler installation manual for more
details.)
10.2 Combustion and Vent Piping Length
Refer to direct vent and non-direct combustion air and vent
sections outlined in installation guides for boiler and Honda
MCHP for specifi c installation procedures and specifi cations.
10.3 Installation
Refer to direct vent and non-direct combustion air and •
vent sections outlined in installation guides for boiler
and HONDA MCHP for specifi c installation procedures
and specifi cations. General guidelines for air intake
and vent piping are found in FW95M-200 Boiler
Installation, Operation and Maintenance
Manual.
Use of periscopes on air intake and venting are allowed. •
Insulate periscopes with proper weather-resistant pipe
insulation if extend over 24” in length, straight length.
10.4 freewatt PLUS System Combustion Air
and Venting
Combustion air and venting installation procedures and
specifi cations are based on installation specifi cations of
boiler and MCHP. Installers are required to follow specifi c
installation requirements found in boiler and MCHP
installation manuals, following guidelines are taken from
these manuals.
10.5 United States Direct Vent System
Requirements
Boiler direct vent exhaust shall be installed in United States
in accordance with following requirements. Allowable
direct vent intake and exhaust piping lengths for boiler
are found in FW95M-200 Boiler Installation, Operation and
Maintenance Manual.
10 - COMBUSTION AIR AND VENT PIPE
WARNING
Read, understand and follow all instructions. Failure
to properly vent or supply combustion air to boiler
can cause carbon monoxide poisoning, or an
explosion or fi re, personal injury or loss of life.
!