Direct Vent; Installation Guidelines - Goodman GRL SERIES Installation Instructions Manual

TABLE 2
UPFLOW UNITS FOR DIRECT VENT APPLICATIONS - AIR FOR COMBUSTION
PROVIDED FROM OUTDOORS
MAXIMUM ALLOWABLE LENGTH IN FEET OF EACH EXHAUST PIPE AND INTAKE AIR PIPE
FURNACE PIPE
TERMINATION
INPUT SIZE
Standard/Concentric
45,000 2"
Alternate
Standard/Concentric
2"
Alternate
60,000
Standard/Concentric
3"
Alternate
Standard/Concentric
90,000 3"
Alternate
NOTES:
1. N.R. - NOT RECOMMENDED.
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 OR 22.5 DEGREE ELBOW IS CONSIDERED ONE ELBOW.
4. CONCENTRIC TERMINATION NO. RXGY-E03 IS FOR THRU-THE-ROOF OR THRU-THE-WALL VENTING.
5. USE KITS RXGY-DO2 (2") OR RXGY-D03 (3") FOR STANDARD OR ALTERNATE THRU-THE-WALL VENTING.
6. NO SCREENS MAY BE USED TO COVER COMBUSTION AIR AND EXHAUST.

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.
18
VENT TERMINATION
KIT RECOMMENDED
(RXGY-D0* Kits for
Horizontal Venting Only)
RXGY-D02/RXGY-E03/RXGY-G01
RXGY-D02
RXGY-D02/RXGY-E03/RXGY-G01
RXGY-D02
RXGY-D03/RXGY-E03/RXGY-G01
RXGY-D03
RXGY-D03/RXGY-E03/RXGY-G01
RXGY-D03
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. Minimum 3 ft. clearance
required between combustion air
inlet and any other exhaust.
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, pipe length is
5 feet for combustion air and
exhaust.
7. Do not install elbows back to
back. Allow at least 15" between
elbows.
Size the exhaust and combustion air
intake pipes as specified in Table 2.
This table lists the maximum allowable
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).
NOTE: Extend the exhaust a minimum
of 18" from the furnace top plate
before turning vent.
8. The maximum exposed vent
/ inch
1
4
length (above the roof line) is 30".
NUMBER OF ELBOWS
45° or 90°
Medium / Long Radius ONLY
1 - 2 3 - 4 5 - 6
65 60 55
55 50 45
40 35 30
20 15 10
120 120 120
110 105 100
110 105 95
50 40 35
COMBUSTION AIR FOR
DIRECT VENT
INSTALLATIONS
THE COMBUSTION AIR SYSTEM
DESIGNED FOR THIS FURNACE
MUST BE USED.
When this furnace is installed as a
direct vent forced air furnace, all
combustion air is supplied directly to
the burner through a special air inlet
system outlined in these instructions.
This system consists of field-supplied
Schedule 40 or 26 SDR-PVC pipe
and one of the following horizontal
vent termination kits: RXGY-D02,
RXGY-D03, or RXGY-E03.
NOTE: Schedule 40 ABS-DWV pipe
and fittings may be used as an
alternate to PVC pipe for the
combustion air inlet and vent pipes.
The combustion air for this furnace is
supplied directly from the outdoors
through the combustion air inlet
system.
When the furnace is installed in the
same space with other gas
appliances, such as a water heater,
be sure there is an adequate supply
of combustion and ventilation air for
the other appliances. Do not delete or
reduce the combustion air supply
required by the other gas appliances
in this space. See Z223.1, National
Fuel Gas Code (NFPA54) for deter-
mining the combustion air
requirements for gas appliances. An
unconfined space must have at least
50 cubic feet (volume) for each
1,000 BTUH of the total input of all
appliances in the space. If the open
space containing the appliances is in
a building with tight construction
(contemporary construction), outside
air may still be required for the
appliances to burn and vent properly.
Outside air openings should be sized
the same as for a confined space.
STANDARD TERMINATIONS
STANDARD VERTICAL
TERMINATIONS
COMBUSTION AIR PIPING
Use two medium-radius sweep
elbows to keep the inlet downward to
prevent entry of rain. See Figure 14
for the proper relationship of
combustion air to exhaust
termination.
STANDARD HORIZONTAL
TERMINATIONS
COMBUSTION AIR PIPING
When 3-in. pipe is used between the
furnace and outside wall, reduce it