Weil-McLain Gold Plus 40, User Manual, Page: 62 / 124

Part number 550-100-090/0809
gas
-
fired water boiler
— Boiler Manual
62
Vent/air piping — options
Vent and air pipe termination options
Vent and air piping must terminate out the sidewall or through 1.
the roof of the building, using only one of the methods described
in this manual.
Sidewall options (see
2. Figure 67, left side):
TOP: Weil-McLain termination cap (kit included with a.
boiler) — see page 18 for instructions.
MIDDLE: Concentric PVC pipe (requires special kit,
b.
page 113).
BOTTOM: Separate air pipe and vent pipe.
c.
Vertical options (
3. Figure 67, right side):
TOP: Concentric PVC pipe (requires special kit, a. page 113).
BOTTOM: Separate air pipe and vent pipe. b.
Vent and air pipe diameters
Vent and air pipe diameters can be as specified in 1. Figure 66.
Vent and air pipe options — summary
Figure 66
Ultr
a model
V
en
t or air
pipe siz
e
• Maximum equivalent feet of piping
• Number of elbows allowed at these lengths
(All applications include allowance for the termination.)
Sidewall
with
W-M Cap
Sidewall
with
separate
pipes
3” PVC Concentric
Sidewall or Vertical
(Use only PVC pipe DO
NOT use CPVC or ABS)
Vertical
with
separate
pipes
Length Ells Length Ells Length Ells Length Ells
80/105
2” * 100
(ab)
2 100 2 100
(ab)
1 100 1
3” 100 2 100 2 100 1 100 1
155 3” 100 2 100 2 100 1 100 1
230
3” 30
(c)
2 30
(c)
2 30
(c)
1 30
(c)
1
4” 100
(d)
2 100 2 70
(d)
1 100 1
299 4” 100 2 100 2 70
(d)
1 100 1
399 4” 100 2 100 2 NA 100 1
Equivalent feet for elbows — deduct from maximum equivalent length of piping:
• 7 feet per for each 4-inch elbow & 2 or 3-inch 90° long-radius or 45° elbow
• 16 feet for each 2- or 3-inch short-radius elbow
a — Use 3"x2" reducer at boiler b — Use 3”x2” PVC reducers at termination
c —
Use 4”x3” reducer at boiler
d —
Use 4"x3" PVC reducers at termination
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 termination.
* Ultra-80 and 105 boilers installed with 2-inch vent piping automatically derate
due to the pressure loss in the vent and air piping. The derate ranges up to 10% for
the Ultra-80 at 100 feet or 15% for the Ultra-105 at 100 feet.
Vent and air pipe minimum length
Vent pipe and air pipe must each be 1.
at least 2 feet long
, with
2 elbows if sidewall venting or 1 elbow if vertical venting.
Vent and air pipe installation sequence
Install the boiler.
Step 1
Determine the termination method — sidewall or vertical,
Step 2
concentric or separate pipes, etc.
Vent and air termination options Figure 67
Sidewall
termination
Weil-McLain sidewall
termination plate
(See page 18)
Weil-McLain
3” PVC concentric
termination
(See page 63)
Sidewall termination
with separate vent
and air pipes
(See page 66)
Vertical
termination
Weil-McLain
3” PVC concentric
termination
(See page 69)
Vertical termination
with separate vent
and air pipes
(See page 73)
Determine proper location for wall or roof
Step 3
penetration for each termination.
Install termination assembly as described in
Step 4
this manual.
Install air and vent piping from boiler to ter-
Step 5
mination.
Install pipe supports and brackets as required.
Step 6