HTP phoenix plus PHP260-119 - Power Venting, Indoor Combustion Air in Confined or Unconfined Space

LP-454 Rev. 004 Rel. 002 Date 12.1.17
23
Contractors must check state and local codes before installing
through an existing vent opening. State and local codes always take
precedence over manufacturer’s instructions. Failure to check state
and local codes before installing through an existing opening could
result in property damage and add signicantly to installation costs.
If an existing venting system is converted for use with this heater, the
installer must ensure that the existing venting system is clean and
free from particulate contamination that could damage the heater.
Failure to do so could result in property damage and heater failure.
Such failure IS NOT covered under warranty.
Concentric Venting Through an Existing System
NOTE: The following instructions refer only to venting through an
existing vent system, and not to venting with HTP’s optional concentric
vent kits. Refer to Concentric Vent Kit installation manual (LP-166) for
further information on venting with the optional concentric vent kits.
Concentric venting through an existing system must run vertically
through the roof. Use only the approved venting materials specied
in Table 5 for piping the system. All instructions listed in this Venting
section apply. See Figures 13-1 and 13-2 for venting demonstrations.
The upper and lower vent terminations as well as all joints in
the venting system must be properly sealed to ensure that all
combustion air is drawn properly and exhaust does not leak from
the system. Failure to properly seal the venting system will result in
property damage, serious personal injury, or death.
Chase Venting Through an Existing System
When venting as a chase, follow all instructions included in this
Venting section, including those in the previous Concentric Venting
Through an Existing System section. See Figure 13-3 for chase venting
demonstration.
AIR INTAKE
W/ SCREEN
Exhaust
Intake
Concentric Venting Through an Existing System
1
Exhaust
Intake
Concentric Venting Through an Existing System
2
Exhaust
Intake
AIR INTAKE
W/ SCREEN
EXISTING
VENT
INTAKE
Chase Venting Through an Existing System
3
Intake
Exhaust
Figure 13 - 1, 2 - Concentric Venting Through an Existing System, 3, Chase Venting Through an Existing System
NOTE: These drawings are meant to demonstrate system venting only. The installer is responsible for all equipment and detailing required
by local codes.
3. Power Venting, Indoor Combustion Air in Conned or
Unconned Space
This heater requires fresh, uncontaminated air for safe operation
and must be installed in a mechanical room where there is adequate
combustion and ventilating air. NOTE: To prevent combustion air
contamination, see Table 2.
Combustion air from the indoor space can be used if the space has
adequate area or when air is provided through a duct or louver to
supply sucient combustion air based on the water heater input.
Never obstruct the supply of combustion air to the water
heater. If the water heater is installed in areas where indoor air is
contaminated (see Figure 14) it is imperative that the water heater
be installed as direct vent so that all combustion air is taken directly
from the outdoors into the water heater intake connection.
Unconned space is space with volume greater than 50 cubic feet
per 1,000 Btu/hour (4.8 cubic meters per kW) of the total input
rating of all fuel-burning appliances installed in that space. Rooms
connected directly to this space, through openings not furnished
with doors, are considered part of the space.
Conned space is space with volume less than 50 cubic feet per
1,000 Btu/hour (4.8 cubic meters per kW) of the total input rating of
all fuel-burning appliances installed in that space. Rooms connected
directly to this space, through openings not furnished with doors,
are considered part of the space.
When drawing combustion air from inside a conventionally
constructed building to a conned space, such space should be
provided with two permanent openings: one located 6” (15 cm)
below the space ceiling, the other 6” (15cm) above the space oor.
Each opening should have a free area of one square inch per 1,000
Btu/hr (22cm2/kW) of the total input of all appliances in the space,
but not less than 100 square inches (645cm2).
If the conned space is within a building of tight construction, air for
combustion must be obtained from the outdoors as outlined in the
Venting section of this manual. See Figure 15.