Conventional Venting - Lochinvar EnergyRite ER202 Installation & Operation Manual

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Conventional venting

A conventional negative draft venting system
Figure 3-1_Conventional Negative Draft Vertical
Venting with Combustion Air Louvers
The outdoor vent cap assembly must be removed before
any connection to a conventional negative draft vent
system can be made. A conventional vent adapter kit
must be installed on the pool heater's flue outlet. The
conventional vent kit includes the flue adapter and an air
inlet cover. Mount the air inlet cover over the combustion
air inlet opening on the rear of the jacket. No additional
draft diverter or barometric damper is required on single
unit installations with a dedicated stack and a negative
draft within the specified range of a negative 0.02 to
0.08 inches water. If the draft in a dedicated stack for a
single unit installation exceeds the maximum specified
draft, a barometric damper must be installed to control
draft. Multiple unit installations with combined venting or
common venting of this pool heater with other Category
I negative draft appliances requires that each pool heater
must have a barometric damper installed to regulate draft
within the proper range.
TABLE - 3A
CONVENTIONAL VENT DATA
Model Conventional Vent
Number Flue Size
ER152 5"
ER202 5"
ER252 6"
ER302 6"
ER402 6"*
*On the ER402 model you MUST have at least 8 feet of
vertical vent to use a 6" vent , if less than 8 feet the vent size
must increase to 7".
Conventional Vent
Kit Number
100140481
100140481
100140482
100140483
100140483
Installation & Operation Manual
The negative draft in a conventional vent installation must
be within the range of a negative 0.02 to 0.08 inches water
to ensure proper operation. All draft readings are made
while the unit is in stable operation (approximately 2 to
5 minutes). Remember that the draft in a conventional
negative draft vent may vary seasonally. A pool heater
with a high draft when operating in the winter months
may have a much lower draft in the summer. Initial
set-up of a vent system with a draft of not more than
a negative 0.05 inches water will generally ensure that
increased draft in the winter months will not exceed the
specified maximum. Maximum draft can not exceed a
negative 0.08 inches of water.
On a conventionally vented, negative draft pool heater, the
connection from the vent to the stack or vent termination
outside the building must be made with listed Type "B"
double-wall (or equivalent) vent connectors and must be
direct as possible with no reduction in diameter. Use the
National Fuel Gas Code venting tables for double-wall
vent to properly size all vent connectors and stacks. The
Type "B" vent and accessories, such as firestop spacers,
thimbles, caps, etc., must be installed in accordance with
the manufacturer's instructions. The vent connector and
firestop must provide correct spacing to combustible
surfaces and seal to the vent connector on the upper and
lower sides of each floor or ceiling through which the vent
connector passes.
Any vent materials specified must be listed by a nationally
recognized test agency for use as vent material.
Locate the pool heater as close as practicable to chimney
or gas vent.
Avoid long horizontal runs of the vent pipe, 90° elbows,
reductions and restrictions. Horizontal portions of the
venting system shall be supported to prevent sagging.
Horizontal runs must slope upwards not less than 1/4 inch
per foot from the appliance to the vent terminal.
Do not use an existing chimney as a raceway for a flue
pipe if another appliance or fireplace is vented through
the chimney.
The weight of the venting system must not rest on the
unit. Adequate support of the venting system must
be provided in compliance with local codes and other
applicable codes. All connections should be secured with
rustproof sheet metal screws.
Vent connectors serving appliances vented by natural
draft MUST NOT be connected to any portion of a
mechanical draft system operating under positive
pressure. Connection to a positive pressure stack may
cause flue products to be discharged into the living space
causing serious health injury.
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