Rheem GF951U Series Installation Instructions Manual page 22

Upflow & downflow/horizontal high efficiency condensing gas furnaces

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Table Of Contents

Table of Contents

DIRECT VENT

INSTALLATIONS

WARNING

READ AND FOLLOW ALL

INSTRUCTIONS IN THIS SECTION.

FAILURE TO PROPERLY VENT

THIS FURNACE CAN CAUSE

CARBON MONOXIDE POISONING

OR AN EXPLOSION OR FIRE,

RESULTING IN PROPERTY

DAMAGE, PERSONAL INJURY

OR DEATH.

Direct vent installations require a

dedicated combustion air and venting

system. All air for combustion is taken

from the outside atmosphere and all

combustion products are discharged

to the outdoors. Therefore, no

ventilation or combustion air

openings are required.

IMPORTANT: The plastic combustion

air and venting components are of

Schedule 40 PVC. If using ABS

piping ensure that the solvent cement

is compatible for joining PVC to ABS

components or use a mechanical

connection that can withstand the

vent temperatures and are corrosion

resistant.

INSTALLATION GUIDELINES

All exhaust piping must be installed in

compliance with Part 7, "Venting of

Equipment," of the latest edition of the

National Fuel Gas Code NPFA54/

ANSI Z223.1-, local codes or

ordinances and these instructions.

1. Vertical piping is preferred.

2. All horizontal piping must slope

upward a minimum of

per foot of run so that condensate

drains toward the furnace.

3. All horizontal runs must be

supported at least every 4 feet.

No sags or dips are permitted.

4. IMPORTANT: Do not common

vent with any other appliance. Do

not install in the same chase or

chimney with a metal or high

temperature plastic pipe from

another gas or fuel-burning

appliance unless the required

minimum clearances to

combustibles are maintained

between the PVC pipe and other

pipes.

TABLE 2

FOR DIRECT VENT APPLICATIONS - AIR FOR COMBUSTION PROVIDED FROM OUTDOORS

MAXIMUM ALLOWABLE LENGTH IN FEET OF EACH EXHAUST PIPE AND INTAKE AIR PIPE

FURNACE

INPUT

45,000

60,000

GF951U

75,000

GF951D

GF951U

90,000

GF951D

GF951U

105,000

GF951D

NOTES:

1. N.A. - NOT APPLICABLE.

2. MAXIMUM OF 6 ELBOWS MAY BE USED. DO NOT COUNT ELBOWS IN ALTERNATE TERMINATION KIT.

MEDIUM OR LONG SWEEP ELBOWS MAY BE USED.

3. A 45 DEGREE ELBOW IS CONSIDERED ONE ELBOW.

4. CONCENTRIC TERMINATION NO. RXGY-E03/RXGY-E03A IS FOR THRU-THE-ROOF OR THRU-THE-WALL

VENTING.

5. USE KITS RXGY-DO2/D02A (2"), RXGY-G02 (2"), OR RXGY-D03/D03A (3") FOR STANDARD OR ALTERNATE

THRU-THE-WALL VENTING.

6. USE KITS RXGY-D04/D04A FOR ALTERNATE VENTING OF 120,000 BTUH UNITS WITH LONG RUNS.

7. KIT NUMBERS CONTAINING SUFFIX "A" ARE APPROVED FOR INSTALLATION IN CANADA.

8. NO SCREENS MAY BE USED TO COVER COMBUSTION AIR AND EXHAUST.

⁄

inch

5. For horizontal runs where water

may collect, wrap the vent pipe

with self-regulating 3 or 5 watt

heat tape. The heat tape must be

U.L. listed and installed per the

manufacturer's instructions.

6. The minimum vent pipe length is

5 feet.

Size the exhaust and combustion air

intake pipes as specified in Table 2.

This table lists the maximum allow-

able length in feet of the exhaust and

combustion air intake pipes that may

be used for all furnace inputs as

related to the number of elbows

required and the termination (see

shaded area).

7. The maximum exposed vent

length (above the roof line) is

30 .

PIPE

TERMINATION

SIZE

Horizontal Venting Only)

Standard/Concentric

RXGY-D02/RXGY-D02A/RXGY-E03A/RXGY-G02

Alternate

Standard/Concentric

RXGY-D02/RXGY-D02A/RXGY-E03A/RXGY-G02

Alternate

Standard/Concentric