Navien NPE-180A, Руководство по установке

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28 Installing the Water Heater
Provide two openings to allow for circulation of combustion air 2.
as specified by ANSI Z223.1/NFPA 54 or CAN/CGA B-149.1:
NPE-180A
NPE-180S
NPE-210A
NPE-210S
NPE-240A
NPE-240S
Maximum Input
(BTU/H)
150,000 180,000 199,900
Outdoor
make up air
is provided, a
minimum free
area of 1 in
2
, per
4,000 BTU/H
40 in
2
10" (W) x
4" (H) or
3" round
45 in
2
10" (W) x
5" (H) or
3" round
50 in
2
10" (W) x
5" (H) or
3" round
Indoor make up
air is provided,
a minimum free
area of 1 in
2
per
1,000 BTU/H
150 in
2
12 1/4"
(W) x
12 1/4" (H)
180 in
2
13 1/4"
(W) x
13 1/4" (H)
199 in
2
14 1/4"
(W) x
14 1/4" (H)
Non-Direct Venting (Single Pipe)
If, at any time, the installation location could experience negative
pressure, there is a possibility of back drafting cold air through
the water heater’s heat exchanger. This situation could lead to
the freezing of the heat exchanger and malfunction of the water
heater.
However, building codes in most jurisdictions disallow negative
pressures in residences. In a home with a well-balanced air supply,
the heat exchanger should not be in danger of freezing. Because
the cause of back drafting is not considered a manufacturing
problem, any freezing damage which occurs from back drafting
will not be covered by the Navien warranty. If there is any question
about the possibility of back drafting in the installation location,
use a direct venting system for the water heater.
When installed in a manufactured home (mobile home), all
combustion air must be supplied from the outdoors as described
on page 26.
When using non-direct venting, maintain non-direct vent
clearances shown on page 29 as required by ANSI Z21.10.3 and
the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and CAN/
CSA B149.1 Natural Gas And Propane Installation Code.
To use non-direct venting for the water heater:
Insert the termination end cap into the intake air duct. Do not 1.
glue the end cap, to allow for easy removal and cleaning of the
cap.
Vent termination cap 2"
Coupling 2"
Pipe 2"