Si (Metric) Conversion Factors; Unit Location; Location Recommendations; Combustible Material And Service Clearances - Modine Manufacturing IFS Installation And Service Manual

SI (METRIC) CONVERSION FACTORS / UNIT LOCATION

SI (METRIC) CONVERSION FACTORS

Table 3.1
To Convert Multiply By To Obtain
"W.C. 0.24 kPa
psig 6.893 kPa
°F (°F-32) x 0.555 °C
inches 25.4 mm
feet 0.305 meters
CFM 0.028 m /min
3

UNIT LOCATION

DANGER
Appliances must not be installed where they may be exposed
to a potentially explosive or flammable atmosphere.
IMPORTANT
To prevent premature heat exchanger failure, do not locate
ANY gas-fired appliances in areas where corrosive vapors (i.e.
chlorinated, halogenated or acid) are present in the atmosphere.

Location Recommendations

1. When locating the furnace, consider general space and
heating requirements, availability of gas and electrical
supply, and proximity to vent locations.
2. Unit must be installed on the positive pressure side of the
circulating blower.
3. Be sure the structural support at the unit location site is
adequate to support the weight of the unit. For proper
operation the unit must be installed in a level horizontal
position.
4. Do not install units in locations where the flue products can
be drawn into the adjacent building openings such
as windows, fresh air intakes, etc.
5. Be sure that the minimum clearances to combustible
materials and recommended service clearances are
maintained. Units are designed for installation on non-
combustible surfaces with the minimum clearances shown
in Figure 3.1 and Table 3.2.
6. Units installed downstream of refrigeration systems, or
exposed to inlet air temperatures of 40°F or less, may
experience condensation. Therefore, provisions should
be made for disposal of condensate. Means have been
provided in the bottom pan of the unit to accommodate a
condensate drain line connection flange.
7. When locating units, it is important to consider that the
combustion air and exhaust vent piping must be connected
to the outside atmosphere, vent terminals should be located
adjacent to one another. The maximum equivalent lengths
are listed in Table 6.1 on page 6.
8. In garages or other sections of aircraft hangars such as
offices and shops that communicate with areas used for
servicing or storage, keep the bottom of the unit at least 7'
above the floor unless the unit is properly guarded to provide
user protection from moving parts. In parking garages, the
unit must be installed in accordance with the standard for
parking structures ANSI/NFPA 88A, and in repair garages
the standard for repair garages NFPA #88B. In Canada,
installation of unit heaters 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.
9. Do not install units in locations where gas ignition system is
exposed to water spray, rain, or dripping water.
To Convert Multiply By To Obtain
CFH 1.699 m 3 /min
Btu/ft 0.0374 mJ/m
3
pound 0.453 kg
Btu/hr 0.000293 kW/hr
gallons 3.785 liters
psig 27.7 "W.C.
Figure 3.1 - Combustible Material and Service Clearances
Access
Model
Side
Size
(A)
75 thru 175 1"
200 thru 400 2"
3
j
ACCESS
SIDE = A
j A 3'' minimum clearance to combustible material is required from the vent collar.
Table 3.2 - Recommended Service Clearances
Access Side
Model Size
75
100/125
150/175
200/225
250/300
350/400

UNIT SUSPENSION

Be sure the means of suspension is adequate to support the
weight of the unit (see Dimensional Data for unit weights).
For proper operation, the unit must be installed in a level
horizontal position. Combustible material and service
clearances as specified in Figure 3.1 and Table 3.2 must be
strictly maintained.
1. Four 1/2" - 13NC tapped holes in top of furnace are
provided to accept ceiling hangers. To assure that flames
are directed into the center of the heat exchanger tubes,
the furnace must be supported in a vertical position. Use a
spirit level to ensure that unit is suspended correctly.
2. NOTE: A pipe hanger adapter kit, shown in Figure 3.2, is
available as an accessory from the factory. One kit consists
of two drilled 3/4" IPS pipe caps and two 1/2 - 13 x 1-3/4"
capscrews to facilitate threaded pipe suspension. Two kits
are required for mounting all duct furnace models.
Figure 3.2 - Suspension Methods
(Threaded Rod)
AIR 5-593.9
TOP = 3"
NON-ACCESS
SIDE = 0
BOTTOM = 1"
Non-Access Top
(A) Side (B) (C)
18"
20"
25"
6" 10"
27"
30"
41"
(Pipe Adapter Kit)
Bottom
(D)
0"
C
3