Lochinvar EnergyRite ER302 - Manual (Page 20)

Installation & Operation Manual
20
4
Vertical venting
The venting system shall terminate at least 4 feet below, 4 feet
horizontally from, or 1 foot above any door, window, or gravity
air inlet into any building.
Do not terminate the vent in a window well, stairwell, alcove,
courtyard, or other recessed area. The vent cannot terminate
below grade. The bottom of the vent terminal shall be located at
least 12 inches above grade.
To avoid a blocked flue condition, keep the vent cap clear of
snow, ice, leaves, debris, etc. Flue gases will form a white plume
in winter. Plume could obstruct window view.
Flue gas condensate can freeze on exterior surfaces or on the
vent cap when a pool heater is operated in the winter months.
Frozen condensate on the vent cap can result in a blocked flue
condition. Flue gas condensate can cause discoloration of
exterior building surfaces. Adjacent brick or masonry surfaces
should be protected with a rust resistant sheet metal plate.
Masonry chimney installation
A masonry chimney must be properly sized for the installation
of a high efficiency gas fired appliance. Venting of a high
efficiency appliance into a cold or oversized masonry chimney
can result in operational and safety problems. Exterior masonry
chimneys, with one or more sides exposed to cold outdoor
temperatures, are more likely to have venting problems. The
temperature of the flue products from a high efficiency
appliance may not be able to sufficiently heat the masonry
structure of the chimney to generate proper draft. This will
result in condensing of flue products, damage the masonry
flue/tile, insufficient draft and possible spillage of flue products
into an occupied living space. Carefully inspect all chimney
systems before installation. If there is any doubt about the sizing
or condition of a masonry chimney, it must be relined with a
properly sized and approved chimney liner system.
Inspection of a masonry chimney
A masonry chimney must be carefully inspected to determine its
suitability for the venting of flue products. A clay tile lined
chimney must be structurally sound, straight, and free of
misaligned tile, gaps between liner sections, missing sections of
liner or any signs of condensate drainage at the breaching or
clean out. If there is any doubt about the condition of a
masonry chimney, it must be relined. An unlined masonry
chimney must not be used to vent flue products from this high
efficiency appliance. An unlined chimney must be relined with
an approved chimney liner system when a new appliance is
being attached to it. Metallic liner systems (Type “B” double-
wall or flexible or rigid metallic liners) are recommended.
Consult with local code officials to determine code requirements
or the advisability of using or relining a masonry chimney.
The directaire vertical vent system
A vertical negative draft venting system
with a combustion air pipe from a sidewall
or rooftop inlet cap
Follow all requirements in the General Venting section and
Conventional Negative Draft Venting for venting flue products to
the outdoors and general installation instructions.
The DirectAire Vertical vent system requires the installation of
two pipes directly to the unit, one vertical pipe with a rooftop
termination for the flue products and one pipe for combustion
air. The combustion air pipe may terminate horizontally with a
sidewall air inlet or vertically with a rooftop air inlet. Vent
connection is made directly to the unit after the outdoor vent
cap assembly is removed and the conventional flue outlet and
direct air inlet adapters are installed. No additional draft
diverter or barometric damper is required on single unit
installations with a dedicated stack and a negative draft
maintained between 0.02 to 0.08 inches water. The flue may be
combined with the vent from any other negative draft,
Category I appliance. Multiple unit installations common
vented with other negative draft appliances require that each
pool heater MUST have a barometric damper installed to
regulate draft within the proper range. The common vent and
connectors from multiple pool heaters must be sized per the
requirements of the venting tables for Type “B” double-wall
vents in the latest edition of the National Fuel Gas Code, ANSI
Z223.1 or in Canada, CAN/CGA - B149 Installation Codes.
The DirectAire sidewall or vertical rooftop combustion air
supply system has specific material and installation
requirements. The air inlet pipe connects directly to the pool
heater to supply combustion air. In most installations, the
combustion air inlet pipe will be a dedicated system with one air
inlet pipe per pool heater. Multiple air inlets for DirectAire
systems may be combined if the guidelines in the Combined Air
Inlet Points section on page 22 are followed. The air inlet pipe
will be connected to a combustion air inlet cap as specified in
this section.
Combustion air supplied from outdoors must be free of
contaminants (see Combustion and Ventilation Air Requirements
in the Determine Pool Heater Location section).