Lochinvar 81 - 286 Install vent and combustion air piping, PVC/CPVC vent piping materials

Installation & Operation Manual

3 General venting

Install vent and combustion air piping

￿DANGER The Knight boiler must be vented and supplied with combustion and ventilation

air as described in this section. Ensure the vent and air piping and the combustion air supply comply with these instructions regarding vent system, air system, and combustion air quality. See also Section 1 of this manual.

Inspect finished vent and air piping thoroughly to ensure all are airtight and comply with the instructions provided and with all requirements of applicable codes.

Failure to provide a properly installed vent and air system will cause severe personal injury or death.

PVC/CPVC vent piping materials

￿WARNING Insulation should not be used on PVC or CPVC venting materials. The use of

insulation will cause increased vent wall temperatures, which could result in vent pipe failure.

Requirements for installation in Canada

1.	Installations must be made with a vent pipe system
	certified to ULC-S636.
	IPEX is an approved vent manufacturer in Canada
	supplying vent material listed to ULC-S636.
2.	The first three (3) feet of plastic vent pipe from the
	appliance flue outlet must be readily accessible for visual
	inspection.
3.	The components of the certified vent system must not be

￿WARNING

NOTICE

￿WARNING

NOTICE

￿WARNING

16

Use only the materials listed in Table 3A for vent pipe, and fittings. Failure to comply could result in severe personal injury, death, or substantial property damage.

Installation must comply with local requirements and with the National Fuel Gas Code, ANSI Z223.1 for U.S. installations or CSA B149.1 for Canadian installations.

For closet and alcove installations, CPVC or stainless steel material MUST BE used in a closet/alcove structure. Failure to follow this warning could result in fire, personal injury, or death.

All PVC vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of a 1/4 inch per foot back to the boiler (to allow drainage of condensate).

This appliance requires a special venting system. The vent connection to the appliance must be made with the starter CPVC pipe section provided with the appliance if PVC/CPVC vent is to be used. For stainless steel venting use an adapter from Table 3B (page 19) that corresponds with the intended vent manufacturer to be used and discard the CPVC starter piece. The field provided vent fittings must be cemented to the CPVC pipe section using an “All Purpose Cement” suitable for PVC and CPVC pipe. Use only the vent materials, primer, and cement specified in this manual to make the vent connections. Failure to follow this warning could result in fire, personal injury, or death.

interchanged with other vent systems or unlisted
pipe/fittings. For concentric vent installations, the inner
vent tube must be replaced with field supplied certifiedvent
material to comply with this requirement.
4. The 3" Concentric Vent Kit available from Lochinvar (see
Section 4 – Sidewall Termination – Optional Concentric
Vent) and the 3" Concentric Vent Kit available from IPEX
are both approved for use on the Knight boiler. Both
kits are listed to the ULC-S636 standard for use in Canada.
￿ CAUTION	Improper installation of PVC or CPVC
	systems may result in injury or death.

Installing vent and air piping

NOTICE	Use only cleaners, primers, and solvents that
	are approved for the materials which are
	joined together.

1.Work from the boiler to vent or air termination. Do not exceed the lengths given in this manual for the air or vent piping.

2.Cut pipe to the required lengths and deburr the inside and outside of the pipe ends.

3.Chamfer outside of each pipe end to ensure even cement distribution when joining.

4.Clean all pipe ends and fittings using a clean dry rag. (Moisture will retard curing and dirt or grease will prevent adhesion.)

5.Dry fit vent or air piping to ensure proper fit up before assembling any joint. The pipe should go a third to two-thirds into the fitting to ensure proper sealing after cement is applied.