Unitary products group PT9-UP Installationshandbuch PDF herunterladen (Seite 13)

035-20417-001 Rev. C (0904)

Unitary Products Group 13

EXTERNAL HORIZONTAL VENT DRAIN

When installing the furnace with a horizontal vent configuration it will be

necessary to install an external drain tee in the horizontal portion of the

vent pipe. The drain tee should be as close as possible to the furnace.

This is recommended to prevent accumulation of excess condensate in

the inducer blower or vent pipe during operational cycles. Refer to Fig-

ure 18 for recommended external vent drain configuration and connec-

tions.

COMBUSTION AIR SUPPLY

All installations must comply with Section 5.3, Air for Combustion and

Ventilation of the National Fuel Gas Code, ANSI Z223.1 or Sections

7.2, 7.3 or 7.4 of CAN/CGA B149.1 or .2 Installation Code - latest edi-

tions.

This furnace is certified to be installed with one of three possible com-

bustion air intake configurations.

1. OUTDOOR COMBUSTION AIR:

This is a sealed combustion air

configuration where the combustion air is supplied through a PVC

or ABS pipe that is connected to the PVC coupling attached to the

burner box and is terminated in the same atmospheric zone as the

vent. This type of installation is approved on all models. Refer to

Figure 19.

2. AMBIENT COMBUSTION AIR:

Combustion air is supplied from

the area surrounding the furnace through vents or knockouts in the

furnace casing. The combustion air and the vent pipes are not ter-

minated in the same atmospheric zone. Refer to Figure 13 for vent

terminations. Refer to “AIR SOURCE FROM INSIDE THE BUILD-

ING” and “VENT AND SUPPLY AIR SAFETY CHECK” for proper

installation. Refer to Figure 20.

3. VENTILATED COMBUSTION AIR:

Combustion air is supplied

through a PVC or ABS pipe that is connected to the PVC coupling

attached to the burner box and is terminated in a ventilated attic or

crawl space. The combustion air and the vent pipes are not termi-

nated in the same atmospheric zone. Refer to Figure 22 for attic

and crawl space termination. Only the combustion air intake may

terminate in the attic. The vent must terminate outside.

Outdoor Combustion Air

Combustion Air Intake/Vent Connections

This installation requires combustion air to be brought in from outdoors.

This requires a properly sized pipe (Shown in Figure 19) that will bring

air in from the outdoors to the furnace combustion air intake collar on

the burner box. The second pipe (Shown in Figure 19) is the furnace

vent pipe.

The combustion air intake pipe should be located either through the

wall (horizontal or side vent) or through the roof (vertical vent). Care

should be taken to locate side vented systems where trees or shrubs

will not block or restrict supply air from entering the terminal.

Also, the terminal assembly should be located as far as possible from a

swimming pool or a location where swimming pool chemicals might be

stored. Be sure the terminal assembly follows the outdoor clearances

listed in Section #1 “Outdoor Air Contaminants.”

FIGURE 15: Double Horizontal Sealed Combustion Air and Vent

Termination

FIGURE 16: Double Vertical Sealed Combustion Air and Vent

Termination

FIGURE 17: External Horizontal Vent Drain

VENT

2”

COMBUSTION AIR

6”

VENT PIPE

FIELD SUPPLIED

EXTERNAL VENT

DRAIN

3” MINIMUM

LOOP DIAMETER

MANUFACTURER

SUPPLIED PVC

WYE AND VENT DRAIN

VENT TRAP

VENT DRAIN

TEE

FIGURE 18: Sealed Combustion Air Intake Connection and Vent

Connection

CONNECTS TO

COLLAR ON TOP

OF BURNER BOX

VENT PIPE CEMENTS

INTO SOCKET JUST

ABOVE TOP PANEL

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 23 24

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