Weil-McLain GV 3, GV 4 User Manual

GOLD

GV

Water Boiler — Series 3 & 4

Venting Supplement

Z-Vent II

Special gas vent system vent and combustion air supplement

Z-Flex®, Inc. Z-Vent II AL29-4C® Stainless Steel Special Gas Vent System may be used in new
installations of GV-3 through GV-6 boilers.

Hazard definitions

The following defined terms are used throughout these Instructions to bring attention to the
presence of hazards of various risk levels or to important information concerning the life of
the product.

Indicates presence of hazards that will cause severe personal injury, death
or substantial property damage.
Indicates presence of hazards that can cause severe personal injury, death
or substantial property damage.
Indicates presence of hazards that will or can cause minor personal injury
or property damage.
Indicates special instructions on installation, operation or maintenance that
are important but not related to personal injury or property damage.

To the installer:

This Venting Supplement must only be used by a qualified installer/service
technician. Read these Instructions completely before beginning the
installation. Failure to follow all instructions can cause severe personal injury,
death or substantial property damage.

To install a new vent system follow instructions in:

• This Venting Supplement.

• GV Boilers Vent/Air Intake Termination Assembly Instructions, if
using Weil-McLain Vent/Air Intake Termination Kit. — OR —

• GV Water Boiler Series 3 & 4 Direct Vent Through-Roof or Through­Unused-Chimney Venting Supplement, if using Weil-McLain
Through-Roof or Through-Unused-Chimney Termination Kit.

• Z-Vent II manufacturer’s instructions supplied with vent material.

For installations above 5,500 feet use only direct vent (ducted combustion
air) when sidewall venting. All of the vertical (through-roof or through­unused-chimney) methods in this Venting Supplement are acceptable and
can result in severe personal injury, death or substantial property damage
if ignored.

Part number 550-110-266/0601

GOLD GV Series 3 & 4 — Z-Vent II Venting Supplement

Combustion air supply

Special note

Refer to GV Boiler Manual for sizing free area of combustion/ventilation air openings.
All boilers experience some condensation in section assembly during start-up. Unlike most conventional boilers,
condensation is minimized in the GV Boiler by a built-in mixing system, maintaining boiler return water
temperature above 130 0F, during steady state operation.
Flue gas condensate is slightly acidic. In most cases pH level is not harmful to vents or drains. When combustion
air is contaminated by vapors from products and areas, listed in Table 1 below, condensate acidic levels increase.
Higher acidic levels attack many materials, including stainless steel commonly used in high efficiency systems.
You may choose to use outside combustion air for any of the following reasons:

• Installation is in an area containing contaminants listed in Table 1 below, which will induce acidic
contamination.

• You want to reduce infiltration into your home through openings around windows and doors.

T able 1 Corrosive contaminants

Products to avoid Areas likely to have contaminants

Spray cans containing chloro/fluorocarbons Dry cleaning/laundry areas and establishments

Permanent wave solutions Swimming pools

Chlorinated waxes/cleaners Metal fabrication plants

Chlorine-based swimming pool chemicals Beauty shops

Calcium chloride used for thawing Refrigeration repair shops

Sodium chloride used for water softening Photo processing plants

Refrigerant leaks Auto body shops

Paint or varnish removers Plastic manufacturing plants

Hydrochloric acid/muriatic acid Furniture refinishing areas and establishments

Cements and glues New building construction

Antistatic fabric softeners used in clothes
dryers

Chlorine-type bleaches, detergents, and clean­ing solvents found in household laundry rooms

Remodeling areas

Garages with workshops

Adhesives used to fasten building products and
other similar products

To prevent the potential of severe personal injury or death, check for areas and products listed
above before installing boiler. If found:

• remove products permanently — OR —

• provide outside combustion air

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Part number 550-110-266/0601

GOLD GV Series 3 & 4 — Z-Vent II Venting Supplement

Vent termination

Venting method definitions

Direct vent — Uses outside combustion air with

combustion air connector piping sealed at all joints and
seams. Also known as “sealed combustion”.

Non-Direct vent — Uses inside combustion air with no

combustion air connector piping.

Properly locate vent termination

Follow instructions on this page
when determining vent location to
avoid possibility of severe personal
injury, death or substantial property
damage.

1. When using direct vent method — Refer to separate
instructions packed with Weil-McLain direct vent
termination kit and vent pipe manufacturer's
instructions for additional locations.

2. For location of non-direct vent vertical termination,
see vent pipe manufacturer's instructions.

3. Gases will form white plume in winter. Plume could
obstruct window view.

4. Prevailing winds could cause freezing of condensate
and water/ice buildup on building, plants or roof.

5. Locate or guard vent to prevent accidental contact
by people or pets.

6. Do not terminate vent in window well, stairwell,
alcove, courtyard, or other recessed areas.

7. Non-Direct vent installations only — Vent must

terminate more than 4 feet below or to side of all doors or windows.

8. Vent must terminate more than 1 foot above grade or anticipated snow
line. In addition, vent termination must be at least 7 feet above public
walkway and 3 feet above any forced air intake within 10 feet. Stay well
away from trees, shrubs, and decorative items. Site conditions may
dictate greater clearances. See Figure 1.

9. Vent must terminate at least 4 feet horizontally, and in no case above
or below, unless a 4 foot horizontal distance is maintained, from electric
meters, gas meters, regulators, relief valves, and other equipment.

10. Locate or guard vent to prevent condensate from damaging exterior
finishes.

11. Do not extend exposed vent pipe outside of building. Condensate could
freeze and block vent pipe.

12. Vent must terminate at least 6 feet away from adjacent walls.

13. Do not terminate vent closer than 5 feet below roof overhang.

14. Do not terminate vent above any door or window. Condensate can
freeze, causing ice formations.

15. Do not use existing chimney as raceway if another appliance or fireplace
is vented into or through chimney.

16. Do not connect:

• Any other appliance to vent pipe.

• Multiple boilers to a common vent pipe.

17. Do not wrap or insulate vent pipe and fittings.

18. Canadian installations — See B149.1 or B149.2 Installation Code.

19. A gas vent extending through an exterior wall shall not

terminate adjacent to the wall or below building
extensions such as eaves, parapets, balconies or decks.
Failure to comply could result in severe personal injury,
death or substantial property damage.

Figure 1 Vent termination locations

3 feet

If within 10 feet

7 feet

Public Walkway

Part number 550-110-266/0601

Forced

air intake

26607

1 foot

1 ft

1 ft

1 ft

Snow

26608

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