Modine Manufacturing LM Installation And Service Manual page 4

A A I I R R R R E E Q Q U U I I R R E E M M E E N N T T S S / / I I N N S S T T A A L L L L A A T T I I O O N N
V V e e n n t t i i l l a a t t i i o o n n / / C C o o m m b b u u s s t t i i o o n n A A i i r r R R e e q q u u i i r r e e m m e e n n t t s s - -
U U n n v v e e n n t t e e d d A A p p p p l l i i c c a a t t i i o o n n s s
Maintain positive air displacement of 4 cfm per 1000 Btu/hr for
natural gas and 5 cfm per 1000 Btu/hr for propane. The fresh
air supply must be located in the immediate proximity of the
unit(s). Fresh air intake openings are typically located high on
the building sidewalls at a comparable level to the heaters.
One square inch of net free inlet area per 1000 Btu/hr is
required. Multiple inlets, well distributed, should be used and
should direct air upward to prevent drafts at floor level. Inlets
are typically limited to 1 to 2 square feet in size.
Modine recommends that units be interlocked with mechanical
exhaust fans for unvented applications. Mechanical exhaust
fans are typically located at high points of the building. For flat
roof areas, a series of small exhausters should be distributed
over the roof areas and interlocked with various heating zones.
U U t t i i l l i i z z i i n n g g O O u u t t s s i i d d e e C C o o m m b b u u s s t t i i o o n n A A i i r r ( ( O O p p t t i i o o n n a a l l ) )
1. If utilizing outside combustion air, an accessory
combustion air intake collar is required.
2. All units may utilize a maximum of 20' of 4" O. D. fresh air
intake pipe with two (2) 90° elbows.
3. A minimum of 24" of intake pipe is recommended for
optimum operation.
4. Keep intake opening at least 5 feet from any exhaust vent
opening.
5. Insure that combustion air cap is protected from snow
blockage.
6. If utilizing outside combustion air, Modine recommends
using insulated pipe or schedule 40 PVC pipe to provide
fresh air and limit condensation from forming on outer
surface. A screened combustion air intake cap is required.
I I n n s s t t a a l l l l a a t t i i o o n n
U U n n i i t t B B t t u u / / h h r r C C o o n n v v e e r r s s i i o o n n
If installing an infrared burner kit, ensure that the unit is
converted per kit instructions 9-559, latest revision, before
continuing with installation.
M M o o u u n n t t i i n n g g
Be sure the means of suspension is adequate to support the
weight of the unit (see Tables 12.1 and 12.2 for system
weights). Where permissible, Modine recommends flexible
mounting. Modine offers chain mounting sets as an accessory.
In the absence of this chain set, Modine recommends Number
1/0 Tenso chain (200 lb. working load). "S" hooks should be a
minimum ¼" in diameter and the ends must be closed after
installation.
Under no circumstances should the gas supply line or the
electrical supply line to the heater provide any assistance in the
suspension of the heater. Do not locate any gas or electric
service lines directly above or below the heater.
Insure that:
1. Clearances to combustibles (as shown on the rating plate
and in Table 4.1) are maintained.
2. In locations used for storage of combustible materials,
signs shall be posted to specify the maximum permissible
stacking height to maintain required clearances from the
heater to the combustibles. See Figure 4.2.
3. Both gas piping and suspension mounting are flexible to
prevent fatigue failure from vibration or thermal expansion.
4. Adequate clearances to sprinkler heads are maintained,
4 4
which are dependent upon the setting of each individual
sprinkler head. As a guideline, LM/HM certified minimum
distance to combustible material is based on the
combustible material surface not exceeding 160°F.
T T a a b b l l e e 4 4 . . 1 1
C C o o m m b b u u s s t t i i b b l l e e M M a a t t e e r r i i a a l l C C l l e e a a r r a a n n c c e e s s
M M i i n n i i m m u u m m C C l l e e a a r r a a n n c c e e s s t t o o C C o o m m b b u u s s t t i i b b l l e e M M a a t t e e r r i i a a l l s s
M M o o d d e e l l
N N o o . . T T o o p p
" " A A " "
L L M M 4 4 0 0 / / 5 5 0 0 9
LM M 6 6 0 0 9
L L M M 7 7 5 5 / / 8 8 5 5 / / 1 1 0 0 0 0 9
H H M M 1 1 2 2 5 5 12
H H M M 1 1 5 5 0 0 12
H H M M 1 1 7 7 5 5
12
H H M M 2 2 0 0 0 0 12
Clearance to each end and above the U-tube is 12 inches.
In unvented applications, clearance to vent cap is 36".
F F i i g g u u r r e e 4 4 . . 1 1
C C o o m m b b u u s s t t i i b b l l e e M M a a t t e e r r i i a a l l C C l l e e a a r r a a n n c c e e s s
"A"
"C"
"B"
0° Mounting Angle
F F i i g g u u r r e e 4 4 . . 2 2
S S t t a a c c k k i i n n g g H H e e i i g g h h t t
Minimum Clearance to
Combustible Materials
Mounting
Stacking
Height
Height
Stacking Height = Mounting Height – Minimum Clearance to
Combustible Material
( ( I I n n c c h h e e s s ) )
B B o o t t t t o o m m S S i i d d e e F F r r o o n n t t
" " B B " " " " C C " " " " D D " "
40 12 40
52 12 52
66 36 66
72 36 72
96 36 96
112 42 112
112 42 112
"A"
"C"
"D"
1° to 45° Mounting Angle
"C"