Weil-McLain GV90+ Installation and operating instructions

Part number 550-100-154_0517
This addendum must only be used by a qualified heating installer/service technician. Read all instructions, including
the GV90+ Series 2 boiler manual and all other information shipped with the boiler, before installing. Perform steps in
the order given. Failure to comply could result in severe personal injury, death or substantial property damage.
Manual Addendum — Venting
Series 2
Gas-Fired Water Boilers
This Addendum needs to be used in conjunction with the GV90+ Series 2
Boiler Manual P/N 550-142-903_1016.
ATTENTION to installers and homeowners of GV90+ boilers.
KEEP THIS ADDENDUM WITH BOILER MANUAL
Polypropylene Vent Systems Approval

Part number 550-100-154_0517
2
GV90+ Series 2 gas-fired water boiler - Manual Addendum - Venting
REPLACES MANUAL PAGE 29
GV90+ Boilers must be vented and sup-
plied with combustion and ventilation air
using piping and methods described in
this manual.
Every boiler must have its own vent. DO
NOT common vent with any other appliance.
See page 16.
Inspect finished vent and air piping thor-
oughly to ensure all are airtight and comply
with the instructions provided and with all
requirements of applicable codes.
Failure to provide a properly-installed vent
and air system will cause severe personal
injury or death.
Venting/combustion air piping - Installations
must provide provisions for combustion and
ventilation air in accordance with the section
“Air for Combustion and Ventilation,” of
the National Fuel Gas Code - ANSI Z223.1/
NFPA54 – latest edition, or Sections 8.2, 8.3,
or 8.4 of Natural Gas and Propane Installa-
tion Code - CAN/CSA B149.1, or applicable
provisions of the local building codes.
Use only the materials listed in this manual
for vent and air pipe and fittings. Failure to
comply could result in severe personal injury,
death or substantial property damage.
If used, a masonry chimney can ONLY be used
as a PIPE CHASE for vent and air pipes —
The vent and air piping must be installed as
instructed in this manual and all joints must
be sealed. The chimney must be used only
for GV90+ boilers. NO OTHER appliance or
fireplace can be connected to the chimney.
The chimney must be straight, with no offsets,
and the vent and air piping materials must
comply with this instruction manual.
The chimney must be fitted with a sealed ac-
cess opening, through which the interior of
the chimney can be inspected.
The chimney and liner must be inspected at
least once annually to verify condition.
Failure to comply could result in severe per-
sonal injury, death or substantial property
damage.
Venting & air piping — general

Part number 550-100-154_0517 3
GV90+ Series 2 gas-fired water boiler - Manual Addendum - Venting
REPLACES MANUAL PAGE 32
Venting & air — general (cont.)
GV90+ Model
Maximum vent and air pipe lengths
(Minimum length for all applications is 2 feet)
(All applications include allowance for the termination fittings)
DIRECT VENT
(combustion air piped to boiler from outside)
DIRECT EXHAUST
(combustion air from inside)
SIDEWALL
termination VERTICAL termination SIDEWALL termination VERTICAL termination
Weil-McLain
vent/air cap
3”
Separate pipes
3”
Concentric
[Note 1]
3”
Separate pipes
3”
Concentric
[Note 1]
3”
Coupling or
W-M Cap
3”
Coupling
See page 37 See page 39 See page 41 See page 43 See page 45 See page 51 See page 53
Max.
Length
(feet)
Max.
Length
(feet)
Max.
Length
(feet)
Max.
Length
(feet)
Max.
Length
(feet)
Max.
Length
(feet)
Max.
Length
(feet)
-3 100 100 100 100 100 100 100
-4 100 100 100 100 100 100 100
-5 100 100 100 100 100 100 100
-6 100 100 100 100 100 100 100
Equivalent feet for elbows — deduct from maximum equivalent length of piping (does not apply to termination fittings)
PVC • 7 feet per for each 3-inch 90° long-radius or 45° elbow
• 16 feet for each 3-inch short-radius elbow
Centrotherm 3” = 6’ 4” = 20’ Duravent 3” = 17’ 4” = 22’
Note 1:
Use only PVC or Polypropylene pipe DO NOT use CPVC or ABS with concentric termination kits.
IPEX 3” PVC concentric vent kits can be used with standard PVC pipe, ttings and cement (ANSI/ASTM D1785) except where ULC
S636 compliance is required. For ULC S636 compliance, all pipe, ttings and cement must be IPEX System 636. When using IPEX
kits, use only IPEX product code 196006 for 3” venting.
Contact Weil-McLain for ordering information and availability of Weil-McLain venting kits.
Polypropylene - Separate pipe and concentric termination by respective manufacturers.
Figure 39 GV90+ Vent and air piping materials — OPTIONS and PIPING LIMITS

GV90+ Series 2 gas-fired water boiler - Manual Addendum - Venting
Part number 550-100-154_0517
REPLACES MANUAL PAGE 33
Figure 40 Vent and air piping materials — Use only the materials listed below, ensuring that all materials meet local codes
ALL vent and air pipes require a BIRD SCREEN at each termination. Most kits do not
include the bird screens. Purchase bird screens separately from Weil-McLain or vent
kit supplier if not included.
Item Material
Standards for installations in:
United States Canada
Plastic piping materials
Vent or air pipe
&
fittings
PVC schedule 40 ANSI/ASTM D1785
Plastic vent pipe must be certified to
ULC S636 when required. (Note 2)
Air pipe can be any of those listed at
left if acceptable for local codes.
PVC-DWV (Note 1) ANSI/ASTM D2665
CPVC schedule 40 (Note 1) ANSI/ASTM F441
ABS-DWV schedule 40 (Note 1) ANSI/ASTM D2661
PVC & ABS pipe
cement & primer
PVC ANSI/ASTM D2564 & F656
CPVC (Note 1) ANSI/ASTM F493
ABS (Note 1) ANSI/ASTM D2235
Polypropylene
vent pipe, ttings,
terminations and
cement
Simpson-Duravent — Obtain all materials from
M&G Simpson-Duravent (3" Appliance adapter part
#3PPS-03PVCM-3PPF)
Centrotherm Eco Systems InnoFlue®
Single-wall — Obtain all materials from
Centrotherm (3" Appliance adapter part #ISAAL0303)
See manufacturer’s literature for detailed
information
MUST USE LOCKING COLLAR
ON EVERY JOINT
ULC S636
AL29-4C piping materials
Vent pipe
AL29-4C
stainless
steel
Heat Fab, Inc. — Saf-T-Vent®
Z-Flex, Inc. — Z-Vent II
Dura-Vent — FasNSeal™
Metal-Fab, Inc. — CORR/GUARD
Certified for Category IV and direct vent
appliance venting —
Weil-McLain bird screens (purchase separately)
Weil-McLain
bird screens
3” vent screen:
W-M part number 383-500-105
Note 1: DO NOT use DWV, CPVC or ABS when using concentric vent termination. Use ONLY PVC schedule 40.
Note 2: IPEX PVC concentric terminations utilize PVC pipe/fittings certified to ULC S636. Where ULC S636 compliance is required, use
only IPEX System 636 pipe, fittings and cement.
AL29-4C vent piping — Install a PVC-to-stainless adapter supplied by the vent pipe manufacturer at the boiler vent connection
and at the termination (when using Weil-McLain plate or concentric PVC termination). DO NOT mix piping from different vent
pipe manufacturers unless using adapters specifically designed for the purpose by the manufacturer.
Plastic piping — Do not attempt to connect different types of plastic piping together.
DO NOT use cellular core pipe.
Venting & air piping— options
4