Lochinvar KNIGHT 399 User Manual download pdf (Page 18)

Installation & Operation Manual

3 General venting

6. Priming and Cementing:

a. Handle fittings and pipes carefully to prevent

contamination of surfaces.

b. Apply a liberal even coat of primer to the fitting

socket.

c. Apply a liberal even coat of primer to the pipe end to

approximately 1/2" beyond the socket depth.

d. Apply a second primer coat to the fitting socket.

e. While primer is still wet, apply an even coat of

approved cement to the pipe equal to the depth of

the fitting socket.

f. While primer is still wet, apply an even coat of

approved cement to the fitting socket.

g. Apply a second coat of cement to the pipe.

h. While the cement is still wet, insert the pipe into the

fitting, if possible twist the pipe a 1/4 turn as you insert

it. NOTE: If voids are present, sufficient cement was

not applied and joint could be defective.

j. Wipe excess cement from the joint removing ring or

beads as it will needlessly soften the pipe.

Table 3A Vent Pipe, and Fittings

PVC/CPVC air intake/vent connections

1. Combustion Air Intake Connector (FIG.’s 3-9 and 3-10) - 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 3-9 and 3-10) - Used to provide a passageway for conveying combustion gases to the outside.

Transition fittings are provided with 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.

6” COUPLING

(FIELD SUPPLIED)

6” CPVC

STARTER

PIECE

(FACTORY SUPPLIED)

VENT

AIR

THE 6” STAINLESS STEEL ADAPTER SUPPLIED

WITH THE BOILER MUST BE USED FOR VENT

CONNECTION TO PVC/CPVC. THE 6” CPVC

STARTER PIECE MUST BE USED FOR PVC ONLY.

Figure 3-10 Near Boiler PVC/CPVC Venting -

Models 700 - 800

VENT

AIR

4" CPVC PIPE SUPPLIED WITH

BOILER MUST BE USED FOR VENT CONNECTION

NOTE: CPVC VENT PIPE AND VENT FITTINGS MUST BE USED IN

CLOSET AND ALCOVE INSTALLATIONS.

* 4” CPVC STREET ELBOW

MAY BE SUBSTITUTED

Figure 3-9 Near Boiler PVC/CPVC Venting - Models 399 - 600

All vent pipe materials and fittings must comply with the following:

Item Material

Standards for installation in:

United States Canada

Vent pipe and fittings

PVC schedule 40 ANSI/ASTM D1785

CPVC and PVC venting must be ULC-

S636 Certified. IPEX is an approved

manufacturer in Canada supplying vent

material listed to ULC-S636.

PVC-DWV ANSI/ASTM D2665

CPVC schedule 40/80 ANSI/ASTM F441

AL29-4C UL1738 ULC-S636

Pipe cement/primer

PVC ANSI/ASTM D2564

IPEX System 636

Cements & Primers

CPVC ANSI/ASTM F493

NOTICE: DO NOT USE CELLULAR (FOAM) CORE PIPE

Approved Stainless Steel Vent Manufacturers

Make Model

ProTech Systems (Simpson Dura-Vent Co.) FasNSeal Vent / FasNSeal Flex* Vent

Z-Flex (Nova Flex Group) Z-Vent

Heat Fab (Selkirk Corporation) Saf-T Vent

*Use of FasNSeal Flex smooth inner wall vent is to be used in vertical or near vertical sections only, taking precaution to ensure

no sagging occurs of the vent system. Connect to the FasNSeal rigid vent using specially designed adapters and sealing method,

see manufacturer’s instructions.

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