Modine Manufacturing DJE Installation And Service Manual page 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
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 A A N N D D M M A A I I N N T T E E N N A A N N C C E E I I N N S S T T R R U U C C T T I I O O N N S S I I N N T T H H I I S S
M M A A N N U U A A L L M M U U S S T T B B E E F F O O L L L L O O W W E E D D T T O O P P R R O O V V I I D D E E S S A A F F E E , , E E F F F F I I C C I I E E N N T T
A A N N D D T T R R O O U U B B L L E E - - F F R R E E E E O O P P E E R R A A T T I I O O N N . . I I N N A A D D D D I I T T I I O O N N , , P P A A R R T T I I C C U U L L A A R R
C C A A R R E E M M U U S S T T B B E E E E X X E E R R C C I I S S E E D D R R E E G G A A R R D D I I N N G G T T H H E E S S P P E E C C I I A A L L
P P R R E E C C A A U U T T I I O O N N S S L L I I S S T T E E D D B B E E L L O O W W . . F F A A I I L L U U R R E E T T O O P P R R O O P P E E R R L L Y Y
A A D D D D R R E E S S S S T T H H E E S S E E C C R R I I T T I I C C A A L L A A R R E E A A S S C C O O U U L L D D R R E E S S U U L L T T I I N N
P P R R O O P P E E R R T T Y Y D D A A M M A A G G E E O O R R L L O O S S S S , , P P E E R R S S O O N N A A L L I I N N J J U U R R Y Y O O R R D D E E A A T T H H . .
1. Disconnect power supply before making wiring connections to
prevent electrical shock and equipment damage. All units must be
wired strictly in accordance with wiring diagram furnished with the
unit.
2. Turn off all gas before installing duct furnace.
3. Gas pressure to duct furnace controls must never exceed 14" W.C.
Testing Piping System. The appliance and its individual shutoff
valve must be disconnected from the gas supply piping system
during any pressure testing if the test pressure is in excess of 1/2
psi.
The appliance must be isolated from the gas supply piping system
by closing its individual manual shutoff valve during any pressure
testing of the gas supply system at test pressures equal to or less
than 1/2 psi.
4. Check gas supply pressure at unit upstream from pressure
regulator. For the purpose of adjustment, the supply pressure
should be 6"-7" W.C. on natural gas or 11"-14" W.C. on propane
gas. Supply pressure with any gas may never exceed 14" W.C.; if
so, install an additional special pressure regulator upstream of the
combination gas valve to provide 11"-14" W.C. gas supply pressure
for propane units and 6"-7" W.C. supply pressure for natural gas
units. Purging of gas piping should be performed as described in
ANSI Z223.1 – Latest Edition or in Canada in CAN/CGA-B149
codes. See page 6 for proper venting instructions.
5. All units must be vented to the outside atmosphere.
6. Do not install in potentially explosive or flammable atmospheres
laden with grain dust, sawdust, or similar air-borne materials. In
such applications a duct furnace in a separate room with ducting,
including appropriate back flow prevention dampers to the dust-
laden room is recommended.
7. Installation of units in high humidity or salt water atmospheres will
cause accelerated corrosion resulting in a reduction of the normal
life span of the units.
8. Duct furnace must be installed on the positive pressure side of the
air-circulating blower.
9. To prevent premature heat exchanger failure d d o o n n o o t t l l o o c c a a t t e e A A N N Y Y
g g a a s s - - f f i i r r e e d d u u n n i i t t i i n n a a r r e e a a s s w w h h e e r r e e c c h h l l o o r r i i n n a a t t e e d d , , h h a a l l o o g g e e n n a a t t e e d d o o r r a a c c i i d d
v v a a p p o o r r s s a a r r e e p p r r e e s s e e n n t t i i n n t t h h e e a a t t m m o o s s p p h h e e r r e e . .
10. To prevent burned-out heat exchanger, or definitely shorter
equipment life, provide uniform and sufficient air distribution over
heat exchanger.
11. Avoid installing units in extremely drafty locations. Drafts can cause
burner flames to impinge on heat exchangers which shortens life.
12. Do not locate units in tightly sealed rooms or small compartments
without provision for adequate combustion air and venting.
Combustion air must have access to the confined space through a
minimum of two permanent openings in the enclosure, at least one
near the bottom. They should provide a free area of one square
inch per 1000 BTU per hour input rating of the unit with a minimum
of 100 square inches for each opening.
13. Do not install unit outdoors.
14. Do not locate unit closer to combustible materials than 6 inches.
15. The maximum allowable temperature rise through any Modine duct
furnace is 85°F (DJE300 and 350 have a 100°F maximum). The
maximum allowable final air temperature is 150°F. Do not exceed
either of these temperature limits.
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S S P P E E C C I I A A L L P P R R E E C C A A U U T T I I O O N N S S
16. Allow at least 6" clearance at the sides and rear to provide ample
air for combustion.
17. Duct furnace is designed for installation on non-combustible floors
with a minimum of 6" clearance from sides, bottom, top and flue to
combustible materials.
18. 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, may occur to materials above the duct
furnace at the temperature described.
19. Modine duct furnaces are designed for use in heating applications
with ambient temperatures between 32°F and 90°F. If an
application exists where ambient temperatures can be expected to
fall outside of this range, contact factory for recommendations.
20. To assure that flames do not impinge on heat exchanger surfaces,
the unit must be suspended in a vertical and level position. Failure
to suspend unit property may shorten the life of the duct furnace.
21. Do not lift duct furnace by gas controls, or gas manifold.
22. Be sure no obstructions block draft diverter of duct furnace.
23. Do not enclose draft diverter in duct.
24. Provide room at either right hand or left hand side of unit for burner
removal. Clearance must equal width of unit. See page 17 for
dimensions.
25. 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.
26. When a fan switch is installed with the furnace, it must be adjusted
to start the blower motor within 30 seconds after burner ignition.
This fan switch should be electrically timed rather than thermally
controlled.
27. In aircraft hangars, keep the bottom of the unit at least 10' from the
highest surface of the wings or engine enclosure of the highest
aircraft housed in the hangar and in accordance with the
requirements of the enforcing authority and/or NFPA No. 409 –
Latest Edition.
28. In garages or other sections of aircraft hangars such as offices and
shops which communicate with areas used for servicing or storage,
keep the bottom of the unit at least 7' above the floor. In public
garages, the unit must be installed in accordance with the Standard
for Parking Structures NFPA No. 88A and the Standard for Repair
Garages NFPA No. 88B. In Canada, installation of duct furnaces in
airplane hangars must be in accordance with the requirements of
the enforcing authority, and in public garages in accordance with
the current CAN/CGA-B149 codes.
29. Consult piping, electrical, and venting instructions in this manual
before final installation.
30. When the duct furnace is installed downstream from refrigeration
systems, condensate may form and provisions should be made to
dispose of the condensate. To prevent condensation on the furnace
casing, duct furnaces installed downstream of cooling coils may
require insulation on outer surfaces if the duct furnace is installed in
an unconditioned space. Insulation must be installed according to,
and meet the requirements of, NFPA No. 90A - Latest Edition.
31. All literature shipped with your unit should be kept for future use for
servicing or service diagnosis. Do not discard any literature shipped
with your unit.
32. When servicing or repairing this equipment, use only Modine-
approved service replacement parts. A complete replacement parts
list may be obtained by contacting Modine Manufacturing
Company. Refer to the rating plate on the unit for complete unit
model number, serial number and company address. Any
substitution of parts or controls not approved by Modine will be at
owner's risk.