Lochinvar 51 operation manual Prepare wall penetrations Alternate Field Supplied Option

Installation & Operation Manual

4Sidewall direct venting (continued)

Prepare wall penetrations

1.Use the factory supplied wall plate as a template to locate the vent and air intake holes and mounting holes.

Air pipe penetration:

a.Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter.

Vent pipe penetration:

a. Cut a hole for the vent pipe. For either combustible or noncombustible construction, size the vent pipe hole with at least a 1/2 inch clearance around the vent pipe outer diameter:

•3½ inch hole for 2 inch vent pipe

•4½ inch hole for 3 inch vent pipe

Drill 3/16" diameter holes for inserting the plastic anchors into the wall.

2.Install the vent and air intake piping through the wall into the vent plate openings. Seal all gaps between the pipes and wall. Use RTV silicone sealant to seal the air pipe. Use the cement/primer listed in Table 3A on page 17 to seal the vent pipe.

3.Mount and secure the vent plate to the wall using stainless steel screws. Seal around the plate to the wall assuring no air gaps.

4.Assemble the vent cap to the vent plate (see FIG. 4-4A). Insert the stainless steel screws into the vent cap screw hole openings and securely attach the vent cap to the vent plate.

5.Seal all wall cavities.

Figure 4-4ASidewall Termination Assembly

	AIR PIPING
VENT PIPING	VENT PLATE
WALL PLATE	VENT CAP
GALVANIZED
THIMBLE

Prepare wall penetrations (Alternate - Field Supplied Option)

1.Air pipe penetration:

a.Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter.

2.Vent pipe penetration:

a.Cut a hole for the vent pipe. For either combustible or noncombustible construction, size the vent pipe hole with at least a 1/2 inch clearance around the vent pipe outer diameter:

•3½ inch hole for 2 inch vent pipe

•4½ inch hole for 3 inch vent pipe

b.Insert a galvanized metal thimble in the vent pipe hole as shown in FIG. 4-4B.

3.Use a sidewall termination plate as a template for correct location of hole centers.

4.Follow all local codes for isolation of vent pipe when passing through floors or walls.

5.Seal exterior openings thoroughly with exterior caulk.

Figure 4-4BAlternate Sidewall Termination Assembly w/Field Supplied Fittings

ELBOW

AIR PIPING

VENT PIPING

BIRD SCREEN

GALVANIZED	ELBOW
THIMBLE
	BIRD SCREEN
SIDEWALL
TERMINATION PLATE

Termination and fittings

1.The air termination coupling must be oriented at least 12 inches above grade or snow line as shown in FIG. 4-1A, page 21.

2.Maintain the required dimensions of the finished termination piping as shown in FIG. 4-1A, page 21.

3.If using the alternate sidewall termination do not extend exposed vent pipe outside of building more than shown in this document. Condensate could freeze and block vent pipe.

4.PVC/CPVC terminations are designed to accommodate any wall thickness of standard constructions per the directions found in this manual.

Multiple vent/air terminations

1.When terminating multiple Knight wall mount boilers terminate each vent/air connection as described in this manual (FIG. 4-5A).

￿WARNING All vent pipes and air inlets must terminate at the same height to avoid possibility of

severe personal injury, death, or substantial property damage.

2.Place wall penetrations to obtain minimum clearance of 12 inches between edge of air inlet and adjacent vent outlet, as shown in FIG. 4-5A for U.S. installations. For Canadian installations, provide clearances required by CSA B149.1 Installation Code.

3.The air inlet of a Knight wall mount boiler 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 4-5AMultiple Vent Terminations (must also comply with Figure 4-1A)

12" MIN. BETWEEN EDGE OF AIR INLET AND ADJACENT VENT OUTLET

VENT

AIR

VENT / AIR 23

TERMINATION