Gv Combustion Air Options; Sizing Air/Ventilation Openings; Direct Exhaust Installations — Gv Without Other Gas Appliances; Air Opening Requirements When Direct Exhaust Venting - Weil-McLain Gold GV Manual

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Prepare boiler location — air openings

GV combustion air options

Using inside air — direct exhaust venting
The GV boiler can use inside air if no contaminants are
present in the boiler space. No pipe is connected to the air
intake fitting.
Using outside air — direct vent
Combustion air can be ducted directly from outside to
the GV boiler air intake fitting. The installation is defined
as
direct vent
Sizing air/ventilation
openings
No other gas appliances in same space
Provide air openings into the boiler space as described in
this section and the National Fuel Gas Code, ANSI Z223.1.
Direct exhaust installations require air for combustion
and ventilation. Direct vent installations may require air
openings for ventilation (to prevent overheating of boiler
controls and boiler space).
When other gas appliances share same space:
For air openings into spaces containing other appliances
in addition to the GV boiler(s) refer to the National Fuel
Gas Code, ANSI Z223.1 for sizing.
Louver allowance
The free area of openings means the area after reduction
for any installed louvers or grilles. Be sure to consider
this reduction when sizing the air openings.
Direct exhaust installations —
GV without other gas appliances
If direct-exhaust vented GV boilers are installed in a space
with no other appliances, size the combustion/ventilation
air openings using Figure 3.
You may also refer to the National Fuel Gas Code for
combustion/ventilation air opening sizing.
Notice the exception given in Figure 3 for large spaces
(volume at least 50 cubic feet per 1,000 Btuh input) in
buildings other than those with tight constructions (as
described on page 15).
14
GOLD GV W GOLD GV W
GOLD GV Water Boiler — Series 4 GOLD GV W GOLD GV W
(also referred to as sealed combustion).
Air openings must be sized to handle
all appliances and air movers
(exhaust fans, etc.) using the air
supply.
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Figure 3 Air opening requirements when
direct exhaust venting
Part number 550-141-856/0703