Lochinvar SNR200-100 Model, Air Intake, Vent, 2General venting, Installation & Service Manual

Models: SNA400-125 SNR150-100 SNA285-125 SNR200-100 SNA500-125

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Air intake/vent connections

TM

Installation & Service Manual

2General venting

Air intake/vent connections

1.Combustion Air Intake Connector (FIG.’s 2-5 and 2-6) - Used to provide combustion air directly to the unit from outdoors. A fitting is provided on the unit for final connection. Combustion air piping must be supported per guidelines listed in the National Mechanical Code, Section 305, Table 305.4 or as local codes dictate.

2.Vent Connector (FIG.’s 2-5 and 2-6) - Used to provide a passageway for conveying combustion gases to the outside. A transition fitting is provided on the unit for final connection. Vent piping must be supported per the National Building Code, Section 305, Table 305.4 or as local codes dictate.

Figure 2-5Near Water Heater Venting Models SNR150-100 - SNR200-100

Figure 2-6Near Water Heater Venting Models SNA285-125 - SNA500-125

AIR

VENT

4" CPVC PIPE INSTALLED IN THE WATER HEATER MUST BE USED FOR VENT CONNECTION

AIR

VENT

3" CPVC PIPE INSTALLED IN THE WATER HEATER MUST BE USED FOR VENT CONNECTION

NOTE: CPVC VENT PIPE AND VENT FITTINGS MUST BE USED IN CLOSET AND ALCOVE INSTALLATIONS.

NOTE: CPVC VENT PIPE AND VENT FITTINGS MUST BE USED IN CLOSET AND ALCOVE INSTALLATIONS.

Air inlet pipe materials:

The air inlet pipe(s) must be sealed. Choose acceptable combustion air inlet pipe materials from the following list:

PVC, CPVC or ABS

Dryer Vent or Sealed Flexible Duct (not recommended for rooftop air inlet)

Galvanized steel vent pipe with joints and seams sealed as specified in this section.

Type “B” double-wall vent with joints and seams sealed as specified in this section.

*Plastic pipe may require an adapter (not provided) to transition between the air inlet connection on the appliance and the plastic air inlet pipe.

The Shield water heater uses model specific combustion air intake and vent piping sizes as detailed in Table 2B below.

Table 2B Air Intake/Vent Piping Sizes

Model

Air Intake

Vent

 

 

 

SNR150-100 -- SNR200-100

3 inches

3 inches

 

 

 

SNA285-125 -- SNA500-125

4 inches

4 inches

 

 

 

NOTICE

Increasing or decreasing combustion air or vent piping is not authorized.

Models SNA400-125 and SNA500-125 will de-rate 1.75% per 25 feet of vent when installed as direct vent or 0.75% per 25 feet of vent when drawing combustion air from the room.

Models SNR150-100 through SNA285-125 will de-rate up to 1% per 25 feet of vent pipe when installed as direct vent, but will not de-rate when drawing combustion air from the room.

Air inlet pipe materials: 16 Table 2B Air Intake/Vent Piping Sizes

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Lochinvar SNR200-100 Model, Air Intake, Vent, 2General venting, Installation & Service Manual, Air intake/vent connections