Part number 550-143-010/1021
29
GV90+
series
2
gas-fired water boiler – boiler manual
Venting & air — general
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 thoroughly
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 Com-
bustion 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 Pro-
pane Installation 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 access
opening, through which the interior of the chim-
ney can be inspected.
The chimney and liner must be inspected at least
once annually to verify condition.
Failure to comply could result in severe personal
injury, death or substantial property damage.
Use ONLY the venting materials and venting
manufacturers’ components and systems ap-
proved by Weil-McLain. Follow all instructions
provided by the venting component and system
manufacturer. Failure to do so can cause flue gas
spillage and carbon monoxide emissions, resulting
in severe personal injury or death.
When removing a boiler from an
existing common vent system
The GV90+ boiler cannot be common vented with
any other appliance.
When an existing boiler is replaced
with a GV90+ boiler, the GV90+ boiler CANNOT use the ex-
isting common vent. The GV90+ boiler requires its own vent
and air piping, as specified in this manual. This may cause a
problem for the appliances that remain on the old common vent,
because the vent may be too large. The following test, required
by ANSI Z21.13/
CSA 4.9 — latest edition
, is intended to check
for proper operation of the appliances remaining on the old
common vent system.
Vent system verification
At the time of removal of an existing boiler, the following steps
shall be followed with each appliance remaining connected
to the common venting system placed in operation, while the
other appliances remaining connected to the common venting
system are not in operation. Seal any unused openings in the
common venting system.
Existing vent test procedure
(The following is intended to test whether the
appliances remaining on an existing vent system
will operate satisfactorily.)
1. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion or other deficiencies which
could cause an unsafe condition.
2. Test vent system — Insofar as is practical, close all build-
ing doors and windows and all doors between the space in
which the appliances remaining connected to the common
venting system are located and other spaces of the building.
Turn on clothes dryers and any appliance not connected to
the common venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they will operate
at maximum speed. Do not operate a summer exhaust fan.
Close fireplace dampers.
3. Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust thermostat so appliance will
operate continuously.
4. Test for spillage at draft hood relief opening after 5 minutes
of main burner operation. Use the flame of a match or candle,
or smoke from a cigarette, cigar, or pipe.
5. After it has been determined that each appliance remaining
connected to the common venting system properly vents
when tested as outlined herein, return doors, windows,
exhaust fans, fireplace dampers, and any other gas-burning
appliance to their previous conditions of use.
Any improper operation of common venting system should be
corrected so the installation conforms with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 — latest edition. Correct by
re-sizing to approach the minimum size as determined using
the appropriate tables in Part 13 of that code. Canadian instal-
lations must comply with Natural Gas and Propane Installation
Code, B149.1 or B149.2.
