GOLD GV Water boiler series 3 — manual
If Prepare boiler location — air openings
GV combustion air options
Using inside air — non-direct vent
The GV boiler can use inside air if no contaminants are present in the boiler space.
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 (also referred to as sealed combustion).
Sizing air openings
Air openings to the GV boiler space are always required, regardless whether combustion air is taken from inside or outside. These air openings provide for ventilation (as well as combustion air) to prevent overheating of the boiler controls and boiler space. Air is also needed for other appliances located in the same space.
Use Figure 3, cases a through d, depending on how the air is supplied and whether the space contains only the GV or other appliances as well. The air opening sizing of Figure 3 is based on ANSI Z223.1, National Fuel Gas Code, intended for natural draft appliances. The GV boiler is not natural draft, so its requirements differ.
Air openings must be sized to handle all appliances and air movers (exhaust fans, etc.) using the air supply.
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.
Single air opening option
A single air opening within 12 inches of the ceiling may be used where the GV boiler is installed in a large space (clearances per Figure 1) with other appliances.
The other appliances must all be installed with at least 1 inch clearance from the sides and back, and 6 inches from the front. The GV boiler must have minimum clearances as shown in Figure 1.
The single air opening may be connected from outside to the appliance space by any of the methods of Figure 3.
The free area of the opening must also be at least equal to the combined area of all appliance vent connectors OR sized per the following, whichever result is larger:
GV direct vent — large shared space — single air opening
Size the single air opening for 1 square inch of free opening for each 3,000 Btuh of all appliances other than the GV. No additional air opening is needed for the GV.
GV inside air — large shared space — single air opening
Size the air opening for 1 square inch of free opening for each 3,000 Btuh of all appliances, including the GV.
GV without other appliances
If the GV boiler is installed in a space by itself, with no other appliance or air mover using air from the space, and with clearances around the boiler no less than those shown in Figure 1 for large space installations:
GV with other appliances
If the GV boiler is installed in a large space (clearances per Figure 1) providing air for a water heater or other gas appliance, size the air openings as follows:
GV direct vent — large shared space
Provide two openings per Figure 3, based only on the size of the other appliances and air movers. No additional air opening area is required for the GV boiler.
GV inside air — large shared space
If the GV combustion air comes from the inside space, size two air openings for the total of all appliances and air movers, including the GV boiler. Use the formula from the appropriate case in Figure 3.
GV direct vent — large space — alone
Air is needed only for ventilation. Size the air openings for any of the cases of Figure 3 for a free area of at least:
1 square inch per 8,000 Btuh of GV input
for each of the two openings. (If a single opening within 12 inches of the ceiling is used, size the opening for 1 square inch of free area for each 3,000 Btuh of GV input.)
GV inside air — large space — alone
Size the air openings for any of the cases of Figure 3 for a free area of at least:
1 square inch per 4,000 Btuh of GV input
for each of the two openings. (If a single opening within 12 inches of the ceiling is used, size the opening for 1 square inch of free area for each 3,000 Btuh of GV input.)
14 | Part number |
