Modine Manufacturing DJE Installation And Service Manual page 6

I I N N S S T T A A L L L L A A T T I I O O N N
! CAUTION
D D O O N N O O T T E E X X C C E E E E D D M M A A X X I I M M U U M M T T E E M M P P E E R R A A T T U U R R E E R R I I S S E E
S S H H O O W W N N I I N N T T A A B B L L E E 7 7 O O N N P P A A G G E E 1 1 3 3 . .
Less than the minimum air flow (CFM) through the furnace
will cause the air temperature rise to exceed the maximum
allowed.
F F I I N N A A L L A A I I R R T T E E M M P P E E R R A A T T U U R R E E
The maximum allowable final air temperature is 150
degrees F. The maximum allowable air temperature rise is
85 degrees F. (The maximum allowable air temperature rise
for size 300 and 350 is 100°F.)
V V e e n n t t i i n n g g
! CAUTION
Gas duct furnaces must be vented — do not operate
unvented.
A built-in draft diverter is provided — additional external
diverters are not required or permitted.
Units using single-stage gas controls can be installed with a
Category I vent system.
Units which are supplied with two-stage, or modulating gas
controls require a Category II vent system. Refer to Figure 5
to determine the vent category required for each size duct
furnace.
Gas-fired heating equipment which has been improperly
vented, or which experiences a blocked vent condition may
have flue gases accidentally spilled into the heated space.
See page 18 for specific information about the blocked vent
safety switch supplied on the unit.
T T h h e e i i n n s s t t a a l l l l a a t t i i o o n n m m u u s s t t c c o o n n f f o o r r m m w w i i t t h h l l o o c c a a l l b b u u i i l l d d i i n n g g c c o o d d e e s s o o r r i i n n
t t h h e e a a b b s s e e n n c c e e o o f f l l o o c c a a l l c c o o d d e e s s , , w w i i t t h h t t h h e e N N a a t t i i o o n n a a l l F F u u e e l l G G a a s s C C o o d d e e , ,
A A N N S S I I Z Z 2 2 2 2 3 3 . . 1 1 l l a a t t e e s s t t e e d d i i t t i i o o n n , , o o r r i i n n C C a a n n a a d d a a C C A A N N / / C C G G A A - - B B 1 1 4 4 9 9 . . 1 1
" " I I n n s s t t a a l l l l a a t t i i o o n n C C o o d d e e f f o o r r N N a a t t u u r r a a l l G G a a s s B B u u r r n n i i n n g g A A p p p p l l i i a a n n c c e e s s " " a a n n d d
C C A A N N / / C C G G A A - - B B 1 1 4 4 9 9 . . 2 2 " " I I n n s s t t a a l l l l a a t t i i o o n n C C o o d d e e f f o o r r P P r r o o p p a a n n e e B B u u r r n n i i n n g g
A A p p p p l l i i a a n n c c e e s s " " . .
The following suggestions should be observed:
1. Comply with local code venting regulations.
2. Select size of vent pipe to fit opening at rear of unit (see
page 17 for dimensions). Do not use a vent pipe smaller
than the vent on the unit. Vent pipe should be galvanized
steel or other suitable corrosion-resistant material. Follow
the National Fuel Gas Code for minimum thicknesses of
vent material; minimum thicknesses for vent connectors
vary depending on pipe diameter. Use an approved-type
chimney when the vent passes through a floor or roof.
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3. Keep vent pipe connector at least 6" from combustible
material.
The minimum distance from combustible material is
based on the combustible material surface not exceeding
160°F. Clearance from the top of the unit may be required
to be greater than 6" if heat damage, other than fire (such
as material distortion or discoloration) may occur to
materials above the unit heater at the temperature
described.
Insulate carefully around section of vent pipe passing
through combustibles. Where vent passes through floor or
roof an opening 4" greater than vent diameter is
necessary. If there is 6' or more of vent pipe in the open
space between the duct furnace and where the vent pipe
passes through floor or roof, the opening in the floor or
roof need only be 2" greater than the diameter of the vent
pipe.
4. Category I and II duct furnaces are defined as having
non-positive pressure vent systems and must not be
common vented with positive pressure vent systems
serving Category III and IV appliances.
5. Category II vent systems must be installed to prevent
accumulation of condensation in the vent system, and
shall have a means provided for drainage of vent
condensate. The drip leg should be cleaned annually.
6. A Category II vent system shall be water tight.
For Category II vent systems, use either .025 inch thick
aluminum or .018 inch thick stainless steel for exhaust
vent. Seal the joints with a metallic tape suitable for
temperatures up to 350°F (3M Company tapes 433 or
363 are acceptable). Wrap the tape two full turns around
the vent pipe.
7. Limit vent pipe horizontal runs to 75% of vertical height
with a minimum upward slope from unit of
suspend securely from overhead structure at points no
greater than 3 feet apart. For best venting, put as much
vertical vent as close to the unit as possible. Fasten
individual lengths of flue together with metal screws.
8. Keep vent pipes as straight as possible, avoiding sharp
bends.
1 / " per foot and
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