A.O. Smith 300 Series, Инструкция по эксплуатации

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24
BACK-FLOW PREVENTER
The air inlet of this heater includes a back-flow preventer (Illustration
shown above) that keeps moist, hot air from rising out of the heater
when it is off. This protects the heater from freeze-up caused by
cold combustion air. It must not be removed.
INTAKE VENT TERMINAL
BACKFLOW PREVENTER
Figure 16. Back-flow Preventer
POLYPROPYLENE INSTALLATIONS
The water heater has been approved to be installed with
Polypropylene vent material as shown in Table 4 and Table 5
. The
approved application of single wall, non-flexible, non-concentric
Polypropylene vent material is offered by two specific manufacturers
(Centrotherm ECO Systems and DuraVent Polypropylene). These
listed products must be installed by following the vent manufacturer’s
instructions. See Table 6 (page 25) to determine the maximum pipe
length and number of elbows that can be used.
Insulation should not be used on Polypropylene venting materials.
The use of insulation will cause increased vent wall temperatures,
which could result in vent pipe failure.
Use only the adapters and vent system listed in Tables below. DO
NOT
mix vent systems of different types or manufacturers. Failure
to comply could result in severe personal injury, death, or substantial
property damage.
Installations must comply with applicable national, state, and local
codes. For Canadian installation, Polypropylene vent must be listed
as a
ULC-S636 approved system. If Polypropylene vent is not required
by your local code, you may use either PVC or CPVC pipes for your
water heater that allows non-metallic venting material installations.
Polypropylene vent systems do not use cement to connect the pipe
and elbow sections but use a push together gasket seal method.
Do not attempt to connect Polypropylene with sealant cement. All
vent connections MUST be secured by the vent manufacturer’s joint
connector. The installer must use a specific vent starter adapter at
the flue connection. The adapter is supplied by the vent manufacturer
to adapt to its vent system.
In order to be in full compliance with
UL 1738
or
ULC-S636 and to meet
the requirements of the water heater manufacturer, you must use
the metal joint connector rings, available from the Polypropylene
vent manufacturer, to stiffen the joints of 2”, and 3” diameter pipes.
Table 4. M & G Duravent PolyPro
Nominal Pipe
Diameter
Flue Outlet Adapter
Adapter
Connector
Ring
Connector
90 Degree
Elbow
Vent Material
Terminal(s)
2” 2PPS-AD PPS-PAC 2PPS-LB 2PPS-E90
2PPS
2PPS & 2PPS-BG for Exhaust;
2PPS-E90 & 2PPS-BG for Intake (Direct Vent only)
3” 3PPS-AD PPS-PAC 3PPS-LB 3PPS-E90
3PPS
3PPS & 3PPS-BG for Exhaust;
3PPS-E90 & 3PPS-BG for Intake (Direct Vent only)
Table 5. Centrotherm InnoFlue SW
Nominal Pipe
Diameter
Flue Outlet Adapter
Adapter
Connector
Ring
Connector
90 Degree
Elbow
Vent Material
Terminal(s)
2”
ISAGL
0202
IAFC02 IANS02 ISELL0287 ISVL02
ISVL02 & IASPP02 for Exhaust;
ISELL0287 & IASPP02 for Intake (Direct Vent only)
3”
ISAGL
0303
IAFC03 IANS03 ISELL0387 ISVL03
ISVL03 & IASPP03 for Exhaust;
ISELL0387 & IASPP03 for Intake (Direct Vent only)
VENT PIPE TERMINATION
The first step is to determine where the vent pipe will terminate. See
Figure 17 (page 25)
,
Figure 19 (page 26), and Figure 20 (page 26)
.
The vent may terminate through a sidewall as shown in Figure 17
,
Figure 19
and
Figure 20
or through the roof as shown in
Figure 21
(page
27)
,
Figure 22 (page 27) and Figure 23 (page 27)
.
The vent system must terminate so that proper clearances are
maintained as cited in local codes or the current edition of the Natural
Gas and Propane Installation Code (CSA-B149.1)
. See
Figure 24 (page 28)
and Figure 25 (page 29)
.
Instructions on proper installation through a sidewall are provided
in
Figure 17
,
Figure 19 , and Figure 20
.
Plan the vent system layout so that proper clearances are maintained
from plumbing and wiring.
Vent pipes serving power vented water heaters are classified by
building codes as vent connectors. Required clearances from
combustible materials must be provided in accordance with
information in this manual under Locating The Water Heater (page 13)
and
Installation Requirements
(page 17), and with the
National Fuel Gas
Code and local codes.