Delta PG PLUS-25 Operations Instructions download pdf (Page 37)

31

Venting and Combustion Air Installation

Venting Option - Direct Vent / Horizontal

In this vent application the PERFORMANCE

PLUS is vented horizontally through a wall

using only approved 3-inch stainless steel vent

material and using outside air for combustion.

The installer should consider the following

when choosing this vent option:

a. The vent system should contain a con-

densate trap located near the unit as

shown in Figs. 22, 22A & 22B, page 34.

b. The vent system must pitch back to the

unit 1/4 inch per foot.

Although the vent system is allowed to

pitch away from the unit, it is recom-

mended that the vent system pitches

toward the unit with a condensate drain

installed as close to the unit as possible.

Opting to pitch the vent system away

poses potential damage to the building

exterior or to the surrounding landscape

and/or potential risks of icing if conden-

sate is formed.

c. Penetration at the wall requires a thimble.

d. Clearance to combustibles must be

maintained per the vent manufacturer’s

requirements. Refer to the vent manu-

facturer’s installation instructions for

additional details.

Maintain a minimum 2-inch clearance to

combustible wall and 1-inch clearance to

non-combustible in the absence of a

manufacturer’s recommended clearance

when penetrating a sidewall.

e. For a zero clearance concentric termina-

tion of the vent and combustion air refer

to the Horizontal Concentric, Horizontal

Single Wall Vent or Horizontal Wa l l

Thimble Kits.

There are two methods available for Direct

Venting - Horizontal:

Separate: The vent and the combustion air

inlet are run together and exit the structure sep-

arately with different terminations. See Fig. 23,

page 35.

The combustion air inlet and the vent

termination must reside in the same

pressure zone area of the building for

proper operation of the appliance.

Combination: The vent and combustion air ter-

minate at a single concentric point using the

Horizontal Concentric, Horizontal Single Wa l l

Vent or Horizontal Wall Thimble Kit. See Figs.

22, 22A & 22B page 34.

Horizontal Wall Thimble Kit

- Requires a 5 1/2 inch x 5 1/2 inch penetra-

tion through any type of wall.

- Allows zero clearance at the wall penetration.

- Maximum wall thickness is 11 inches.

- The use of a termination elbow for the

venting system is not recommended when

using the Horizontal Wall Thimble Kit.

To prevent potential nuisance lock-outs

or flue gas recirculation it is recom-

mended to terminate the vent with a hor-

izontal termination tee or side discharge

vent hood.

BEST PRACTICES

NOTICE

NOTICE

BEST PRACTICE

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