Install Instructions (Venting)

Part number 550-100-103/1110
GAS-FIRED WATER BOILER — Manual addendum — Venting
A–6
Venting & air — general (cont.)
Figure 4 Vent and air pipe options and maximum allowable piping lengths
Ultra model
Vent or air
pipe size
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(All applications include allowance for the terminations.)
Direct vent
Sidewall
with
Weil-McLain
vent/air cap
Direct vent
Sidewall with
separate pipes
— or —
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(sidewall or vertical)
3” PVC Concentric
Sidewall or Vertical
(Use only PVC pipe
DO NOT use CPVC
or ABS)
[Note 1]
4” PVC Concentric
Sidewall or Vertical
(Use only PVC pipe
DO NOT use CPVC
or ABS)
[Note 1]
Direct vent
Vertical
with separate
pipes
Direct vent
Vertical exhaust
Sidewall air
Direct vent
only
Direct vent or
Direct exhaust
Direct vent
only
Direct vent
only
Direct vent
only
Direct vent
only
Length Ells Length Ells Length Ells Length Ells Length Ells Length Ells
80/105
2” * 100 (ab) 2 100 (a) 2 100 (ab) 1 NA 100 (a) 1 100 (a) 1
3” 100 2 100 2 100 1 NA 100 1 100 1
155 3” 100 2 100 2 100 1 NA 100 1 100 1
230
3” 30 (c) 2 30 (c) 2 30 (c) 1 30 (c)(d) 1 30 (c) 1 30 (c) 1
4” 100 (d) 2 100 2 70 (d) 1 100 1 100 1 100 1
299 4” 100 2 100 2 70 (d) 1 100 1 100 1 100 1
310 4” 100 2 100 2 70 (d) 1 100 1 100 1 100 1
399 4” 100 2 100 2 NA 100 1 100 1 100 1
Note 1:
IPEX 3” and 4” PVC concentric vent kits can be used with standard PVC pipe, fittings and cement (ANSI/ASTM D1785) except
where ULC S636 compliance is required. For ULC S636 compliance, all pipe, fittings and cement must be IPEX System 636. When
using IPEX kits, use only IPEX product code 196006 for 3” venting or IPEX product code 196021 for 4” venting.
Contact Weil-McLain for ordering information and availability of Weil-McLain venting kits.
Additional
notes
a —
Use 3”x2” reducer at boiler
C Use 3”x2” reducers at termination
c — Use 4”x3” reducer at boiler
d — Use 4”x3” reducers at termination
* Ultra-80 and 105 boilers installed with 2-inch vent piping automatically derate due to the pressure loss in the vent and air pip-
ing. The derate ranges up to 10% for the Ultra-80 at 100 feet or 15% for the Ultra-105 at 100 feet.
Equivalent feet for elbows — deduct from maximum equivalent length of
piping:
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Stainless (AL29-4C) vent pipe
install an adapter at the boiler for all applications. Also install an
adapter at the termination unless using separate-pipe termina-
tion.