Com Bust Ion Air And Vent Piping; General - UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual

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W ARN I N G
Fire, explosion, and asphyxiat ion hazard.
I m proper inst allat ion could result in deat h or
serious inj ury. Read t hese inst ruct ions and
underst and all requirem ent s before beginning
inst allat ion.
!
W ARN I N G
ABS/ PVC vent ing shall not t o be used t his
product .
Use of DWV plum bing pipes t o vent t his boiler
shall be prohibit ed.
Use of cellular core PVC ( ASTM F891) , cellular
core CPVC, or Radel® ( polyphenolsulfone) in
vent ing syst em s shall be prohibit ed.
Covering non-metallic vent pipe and fittings with
t herm al insulat ion shall be prohibit ed.
Failure t o follow t hese inst ruct ions could result in
deat h or serious inj ury.
Follow vent ing m anufact urer's
N o t e
equivalent lengths for specialty fittings.
5 .1 Genera l
• I nst allat ions shall com ply wit h Aut horit y having
j urisdict ion and in absence of such wit h:
» U.S. ANSI Z223.1 / NFPA 54 in t he Unit ed St at es
» CSA B149.1 in Canada.
• This boiler requires a dedicat ed direct vent syst em .
• Vent connect ions serving appliances vent ed by
nat ural draft shall not be connect ed int o any port ion
of m echanical draft syst em s operat ing under posit ive
pressure.
• Use only m anufact urer approved vent ing m at erials or
vent ing m at erials prim er and glue approved t o: ULC
S636 in Canada, or UL 1738 in t he U.S.
• Mat erials used in t he U.S. shall com ply wit h Aut horit y
having j urisdict ion and in absence of such wit h:
ANSI / ASTM D1785, ANSI / ASTM F441, ANSI / ASTM
F493.
• Vent syst em m ust have unrest rict ed m ovem ent
t hrough walls, ceilings and roof penet rat ions.
• Check for proper j oint const ruct ion when j oining pipe
to fittings.
• If vent is penetrating ceilings and floors, openings
must have means of fire stopping in joist areas and
proper fire-stop spacer assemblies installed.
• Standard roof flashing methods must be used to
install roof flashing.
• Fram e wall and roof openings t o provide support for
at t achm ent of t erm inat ion assem blies.
5 - COM BU STI ON AI R AN D V EN T PI PI N G
• Support piping in accordance wit h pipe
m anufact urer's inst ruct ion and aut horit y having
j urisdict ion. I n absence of m anufact urer's inst ruct ion
use pipe hooks, pipe st raps, bracket s, or hangers of
adequat e and st rengt h locat ed at int ervals of 3 ft (1 m )
or less. Allow for expansion/ cont ract ion of pipe.
• Vent ing shall be support ed adj acent t o each j oint
using st eel st rapping or equivalent . See Figure 5- 1.
• Support horizont al sect ions of vent pipe t o prevent
sags capable of accum ulat ing condensat e.
• Assem ble vent m at erials in accordance wit h vent ing
m anufact urer's inst ruct ions.
• Slope exhaust pipe m inim um of 1/ 4" per foot , or
vent m anufact urer's recom m endat ion, whichever is
great er; back t oward t he boiler.
• Any "in line" elbows in flue system must be taken
int o considerat ion. First elbow on t he t op of t he
boiler is included in equivalent lengt h calculat ions.
• Use U.V. st abilized polypropylene when it will be
exposed t o sunlight , wind, or prone t o freeze ups.
• Check for proper j oint const ruct ion when j oining pipe
to fittings.
• Manufact urer requires use of an approved
m echanical fast ener, which m ay vary per vent pipe
manufacturer, at every push-fit gasket connection
when using a single wall polypropylene vent syst em .
• Refer to specific vent manufacturer's manual for
addit ional support .
Figu r e 5 - 1 - Ve n t in g Su ppor t
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240013503 REV A, [ 03/ 15/ 2022]