Lochinvar EnergyRite ER202 Installation & Operation Manual page 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.
20
Installation & Operation Manual
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).