Delta PG PLUS-25 Operations Instructions download pdf (Page 35)

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Venting and Combustion Air Installation

- Must maintain 4 feet of clearance

below and horizontally from doors and

windows. See dimension A Fig. 17.

If the venting application is a vertical direct

or non-direct vent application:

- The vent must terminate at least 3 feet

above the roof and at least 2 feet higher

than any portion of the building within

10 feet.

Multiple Vent Terminations

For multiple unit installation venting horizon-

tally, it is recommended to vent as direct vent

using the Horizontal Wall Thimble Kit or

Horizontal Concentric Kit. The terminations

of these installations must maintain the same

horizontal centerline and be spaced a minimum

18 inches from center to center.

For multiple unit installation venting vertically,

it is recommended to vent as direct vent using

Triangle Tube Vertical Concentric Vent Kit.

The concentric vent / combustion air termina-

tions must maintain a minimum 18 inch spac-

ing from vent centerline to vent centerline.

Locating the Combustion Air Inlet

When ducting outside combustion air directly

to the appliance the installer must use the fol-

lowing guidelines:

1. The total equivalent length of the air inlet

duct should not exceed 100 feet as given in

Table 2, page 33.

2. The installer must consider the following

when determining the location of the com-

bustion air inlet:

- The air inlet must terminate at least 12

inches above grade or projected snow

line.

- The combustion air inlet must be locat-

ed a minimum 12 inches from the vent

termination. This does not apply to

Horizontal Concentric Direct Venting

applications using the Horizontal Wall

Thimble kit . See Fig. 23 page 35

- The combustion air inlet should not be

located above the vent termination.

- The combustion air inlet must be locat-

ed in the same pressure zone as the vent

termination.

Venting Option - Non Direct Vent / Vertical

In this vent application the PERFORMANCE

PLUS is vented vertically through the roof or

an unused chimney using only approved 3 inch

stainless steel vent material and using room air

for combustion.

The installer should consider the following

when choosing this vent option:

a. The vent system must contain a con-

densate trap located no higher than 2

feet above the unit. As shown in Fig. 19

page 34.

b. The vent system must pitch back to the

unit 1/4 inch per foot or as specified by

the vent manufacturer.

c. Clearance to combustibles must be

maintained per the vent manufacturer’s

requirements. Refer to the vent manu-

facturer’s installation instructions for

additional details.

d. At a minimum, a 3-inch elbow should

be placed on the combustion air inlet of

the unit. This will prevent an acciden-

tal blockage should anything be placed

on top of the unit.

When using an unused chimney as a

means of a raceway for the 3 inch vent,

the surrounding space cannot be used to

draw combustion air.

NOTICE

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