Lochinvar KNIGHT 399 User Manual download pdf (Page 21)

Installation & Operation Manual

Model Kit Number

Equivalent

Vent Length

399 CVK3007 5 Feet (1.5 m)

500 CVK3007 30 Feet (9 m)

600 CVK3007 30 Feet (9 m)

3 General venting (continued)

Vent, air piping and termination:

The Knight XL vent and air piping can be installed through the

roof or through a sidewall. Follow the procedures in this

manual for the method chosen. Refer to the information in this

manual to determine acceptable vent and air piping length.

Removing from existing vent

Follow the instructions in Section 1, page 12 of this manual

when removing a boiler from an existing vent system.

Vent and air piping

Vent and air system:

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.

You must also install air piping from outside to the boiler air

intake adapter. The resultant installation is direct vent (sealed

combustion).

You may use any of the vent/air piping methods covered in this

manual. Do not attempt to install the Knight XL using any

other means.

DO NOT mix components from different

systems. The vent system could fail, causing

leakage of flue products into the living

space. Use only approved stainless steel,

PVC or CPVC pipe and fittings. For

PVC/CPVC use with primer and cement

specifically designed for the material used.

NOTICE

 WARNING

Table 3E Concentric Vent Kit Equivalent Vent Lengths

The appliance output rating will reduce by

up to 1.5% for each 25 feet (68 m) of vent

length.

NOTICE

Minimum / Maximum allowable

combustion air and vent piping lengths

are as follows:

Combustion Air = 12 equivalent feet (3.7 m) minimum / 100

equivalent feet (30.5 m) maximum

Ven t = 12 equivalent feet (3.7 m) minimum / 100 equivalent

feet (30.5 m) maximum

When determining equivalent combustion air and vent

length, add 5 feet (1.5m) for each 90° elbow and 3 feet (.9 m)

for each 45° elbow.

EXAMPLE: 20 feet (6 m) of PVC pipe + (3) 90° elbows + (3)

45° elbows + (1) concentric vent kit (CVK3007) = 49

equivalent feet (15 m) of piping.

Model Air Intake Vent

399 - 600 4 inches (102 mm) 4 inches (102 mm)

700 - 800 4 inches (102 mm) 6 inches (152 mm)

The Knight XL uses model specific combustion air intake and

vent piping sizes as detailed in Table 3D below.

Table 3D Air Intake/Vent Piping Sizes

Increasing or decreasing combustion air

or vent piping is not authorized.

NOTICE

Optional room air

Commercial applications utilizing the Knight XL boiler may be

installed with a single pipe carrying the flue products to the

outside while using combustion air from the equipment room.

In order to use the room air venting option the following

conditions and considerations must be followed.

• The unit MUST be installed with the appropriate

room air kit (Table 3F).

• The equipment room MUST be provided with

properly sized openings to assure adequate

combustion air. Please refer to instructions provided

with the room air kit.

• There will be a noticeable increase in the noise level

during normal operation from the inlet air opening.

• Using the room air kit makes the unit vulnerable to

combustion air contamination from within the

building. Please review Section 1, Prevent

Combustion Air Contamination, to ensure proper

installation.

• Vent system and terminations must comply with the

standard venting instructions set forth in this manual.

NOTICE

Optional room air is intended for

commercial applications. Combustion air

piping to the outside is recommended for

residential applications.

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