Installation
20
GUNE-SVX001A-EN
Combustion Air
Notes:
•
Combustion and exhaust venting instructions below
describe two-pipe venting of a duct furnace configured
for separated combustion.
•
If converting the duct furnace to separated
combustion, use the air inlet conversion kit that
shipped loose with the unit.
•
If venting a separated combustion duct furnace
concentrically (through one roof or wall termination), a
Combustion Air Inlet Kit (X7) is required and
instructions included with the kit should be followed
with regards to vent pipe installation.
To convert the unit to separated combustion remove
screen and mounting plate from air inlet on top panel of
unit by removing four (4) screws. Secure ship loose inlet
collar and gasket to inlet opening re-using the four (4)
screws removed in previous step. The access panel must
also be sealed using the ship loose gasket. Cut gasket to
lengths listed in
. Remove paper backing and
adhere to access panel making certain that the entire
perimeter is covered (see
). After supply
power line is run to main control board, seal the gap
between cord and hole in rear panel with silicone sealant.
1.
\
In the United States, the combustion air system
installation must be in accordance with the latest
edition of ANSI Z223.1 (NFPA 54) National Fuel Gas
Code. In Canada, installation must be in accordance
with CSA-B149.1 “Installation Code for Natural Gas
Burning Appliances and Equipment” and CSA-B149.2
“Installation Code for Propane Burning Appliances and
Equipment.”
2. A Breidert Type L or Fields Starkap, furnished by the
customer, must be installed at the termination point of
the combustion air system. See
and
3. Each duct furnace MUST have its own combustion air
system. It MUST NOT be connected to other air intake
systems.
4. Combustion air intake duct may be PVC, CPVC, Type B
vent, single wall, double wall or other material
approved by local code authority. Never use duct size
other than diameter stated in these instructions.
5. Long runs of single wall combustion air piping passing
through an unheated space may require insulating if
condensation becomes noticeable.
6. The combustion air system must be installed to
prevent collection of condensate. Pitch horizontal
pipes downward 1/4 inches per foot (21 mm/m) toward
the inlet cap to facilitate drainage. Vertical combustion
air pipes should be piped as depicted in
7.
The equivalent length of the combustion air system
must not be less than 5 feet (1.5 m) and must not
exceed 50 feet (15.2 m). Equivalent length equals the
total length of straight pipe, plus 10 feet (3.05 m) for
each 90° elbow and 4 feet (1.22 m) for each 45° elbow.
Note:
For optimum performance keep the combustion air
system as straight as possible.
8. Each slip joint must be secured with at least three
corrosion resistant screws. Two full turns of 3M™ #425
Aluminum Foil Tape or its equivalent must then be
used to seal each joint. General Electric RTV-108,
Dow-Corning
®
RTV-732 or an equivalent may be used
instead of tape.
9. For horizontal combustion air systems longer than
5 feet (1.5 m), the system must be supported from
overheard building structures at 4 feet (1.22 m)
maximum intervals in the United States and at 3 feet
(1 m) maximum intervals in Canada.
WARNING
Carbon Monoxide Poisoning!
Never operate separated combustion duct furnaces
without combustion air and flue gas piping in place.
Each duct furnace MUST have its own combustion air
system and MUST NOT be connected to other vent
systems or to a chimney. Your venting system must not
be blocked by any snow, snow drifts, or any foreign
matter. Inspect your venting system to ensure adequate
ventilation exists at all times! Failure to follow these
instructions could result in Carbon Monoxide Poisoning
(symptoms include grogginess, lethargy, inappropriate
tiredness, or flu-like symptoms) which could result in
death or serious injury.
Table 8.
Gasket lengths
Unit
Size
Top/Bottom
Gasket Length (in) Qty
Right/Left
Gasket Length (in) Qty
010
8-3/4
2
28-1/8
2
015
12
2
28-1/8
2
020
15-1/4
2
28-1/8
2
025
18-1/2
2
28-1/8
2
030
21-3/4
2
28-1/8
2
035
25
2
28-1/8
2
040
28-1/4
2
28-1/8
2
