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TURBOPOWER 99
WATER HEATER
PV500-12 08/12 9
7 VERTICAL AND HORIZONTAL REMOTE AIR
7.1 Vertical or Horizontal Remote Air Option
The vertical or horizontal remote air system requires a factory or site installed remote combustion air inlet option
package. If your water heater does not include this optional equipment, contact your PVI sales representative to
purchase the Remote Air Kit. The air inlet termination cap supplied with combustion air inlet option must be
installed. Do not fabricate this from locally available parts as it may cause unsafe operation. Combustion air
supplied from outdoors must be free of contaminants.
7.2 Remote Air Piping Design
The water heater can obtain remote air either vertically, through a ceiling or roof, or horizontally through a wall.
Locally obtained solid PVC pipe must be attached to the remote air inlet. Larger solid PVC pipe may be
substituted; however a PVC increaser must be used.
When the remote combustion air inlet and flue gas outlet are located on the same roof top surface, the cap must
terminate at least 3 feet lower than the flue gas outlet, if located within a 10 foot radius.
Locate the remote combustion air inlet and the flue gas vent outlet in a wall or roof with similar wind pressure.
Install the inlet cap at least one foot above the rooftop or at least 18" above grade and at least one foot above
normal snow levels.
WARNING: Locate the termination of the combustion air inlet outdoors to minimize flue gas recirculation
and to minimize the opportunity for products of combustion to enter the building. Recirculation of flue
gas (products of combustion drawn from the flue gas outlet into the combustion air inlet) can cause
operational problems, premature unwarranted product failure or unsafe operation producing carbon
monoxide. Exposure to carbon monoxide can result in property damage, personal injury or death.
7.3 Maximum Allowed Combustion Air Vent Length (Equivalent Length)
Water
Heater
Prefix
Input, Btu/h
W/Remote
Air
Input, Btu/h
100 equivalent
feet, vent
diameter:
225 equivalent
feet, vent
diameter:
742 500,000 500,000 6” 10”
1485 999,000 950,000 6” 10”
2228 1,500,000 1,500,000 8” 12”
2971 1,950,000 1,850,000 8” 12”
For maxim allowed remote air lengths (equivalent length) longer than those shown above, contact the factory.
7.4 Remote Air Piping of Multiple Units
Each unit must have a dedicated remote combustion air duct. Combining multiple-unit combustion air ducts into a
common duct or breeching is not allowed.
VENT PIPE FITTINGS EQUIVALENT (in feet)
90º Elbow 14 feet
90º Long Radius Elbow 12 feet
45º Elbow 6 feet