Installation & Operation Manual

4 Sidewall direct venting (continued)

2.Place wall penetrations to obtain minimum clearance of 12 inches (305 mm) between vent pipe and adjacent air inlet, as shown in FIG. 4-4 for U.S. installations. For Canadian installations, provide clearances required by CSA B149.1 Installation Code.

3.The air inlet of a Crest is part of a direct vent connection. It is not classified as a forced air intake with regard to spacing from adjacent boiler vents.

Figure 4-4Multiple Vent Terminations (must also comply with Figure 4-1)

 

VENT

 

AIR

 

12"

36" MIN

 

48" MAX

36"

 

12"

12" MIN

 

Figure 4-5Direct Vent Terminations

DIRECT VENT TERMINATIONS

Air Inlet

Vent Termination

Dryer Inlet

Straight

Figure 4-6Room Air (Direct Exhaust Terminations)

ROOM AIR (DIRECT EXHAUST TERMINATIONS)

Vent Termination

23° Elbow

45° Elbow

90° Elbow

Room air

The Crest boiler may be installed with a single pipe carrying the flue products to the outside while using combustion air from the equipment room.

Follow the requirements in the General Venting, Sidewall Direct Venting, and Vertical Direct Venting sections for vent material specifications, vent length requirements, and vent termination requirements.

Install the air inlet cover (shipped loose with the boiler) per FIG. 4-7. Combustion and ventilation air must be supplied to the equipment room per the requirements on pages 12 and 13 of this manual for proper operation of the Crest boiler when utilizing the single pipe method.

Figure 4-7Room Air Installation

AIR INLET COVER

90° Elbow

Mitered

23° Elbow

23

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Lochinvar 3.5, 2.5 service manual Room air, 4Multiple Vent Terminations must also comply with Figure

3, 2, 3.5, 2.5 specifications

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