Weil-McLain Ultra Installation Manual page 3
Commercial gas-fired water boilers
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Also See for Ultra:
- Installation and start-up manual (113 pages) ,
- Manual (108 pages) ,
- Manual addendum (28 pages)
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Material checklist — vent and air piping
DIRECT EXHAUST
SIDEWALL
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DIRECT VENT
SIDEWALL
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DIRECT EXHAUST
VERTICAL
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SNORKELING OPTION — Vent pipe can
be extended up as shown at left. See
manual for details.
DIRECT VENT
VERTICAL
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SNORKELING OPTION — Vent pipe can
be extended up as shown at left. See
manual for details.
Venting
Direct exhaust (use inside air), sidewall or vertical
options:
Direct vent (pipe air to boiler), sidewall or vertical
(All applications include allowance for the termination.)
Sidewall with
separate pipes
Length
550
6"
100
6"
30
750
8" **
100
* Equivalent feet for elbows — Deduct 7 feet for each additional 6-inch or
8-inch elbow (90° or 45°) from maximum equivalent length of piping.
** Install a pipe reducer to adapt from 8" PVC to the 6" PVC pipe size re-
quired at the boiler. You do not have to reduce allowable pipe length for
the reducer. Install reducer directly at the boiler, oriented vertically.
Items
Material
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Plastic
PVC schedule 40
PVC-DWV
Vent or air pipe
& fittings
CPVC schedule 40
ABS-DWV schedule 40 ANSI/ASTM D2661
PVC
PVC & ABS pipe
CPVC
cement & primer
ABS
DO NOT use cellular core pipe for vent or air piping.
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Material — PVC
CPVC
Straight pipe
Elbows, 90-degree (include termination elbows as
needed)
Couplings (include termination, used for vertical vent
or sidewall vent if no external upwards extension)
Return bend, 180-degree (vertical air-pipe termina-
tion)
Reducers, 8"x6" (for Ultra-750 only when using
8-inch vent and/or air piping)
Louvers for ventilation openings, when specified in boiler manual
(required for all direct exhaust applications)
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— applies to all
Vertical with
separate pipes
Ells *
Length
Ells *
2
100
2
2
30
2
2
100
2
United States
Canada
piping material options
ANSI/ASTM D1785
ANSI/ASTM D2665
Plastic vent pipe
must be certified
ANSI/ASTM F441
to UL S636 when
required.
Air pipe can be any
of those listed at
ANSI/ASTM D2564
left if acceptable for
local codes.
ANSI/ASTM F493
ANSI/ASTM D2235
ABS
6"
8"
feet
1
1
(direct exhaust)
2
(direct vent)
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