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si (metric) conversion factors / unit location
si (metric) conversion factors
table 3.1
to convert
"W.C.
(inches water column)
psig
subtract 32 and then
°F
multiply by 0.555
inches
feet
CFM
CFH
btu/ft 3
pound
btu/hr
gallons
unit location
dANGER
Appliances must not be installed where they may be exposed
to a potentially explosive or flammable atmosphere.
cAUTION
Appliances are designed for outdoor installation only. DO NOT
LOCATE APPLIANCES INDOORS.
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 and availability of gas and electrical supply.
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. For HFG units, be sure clearances are
maintained to the combustion air/vent cap. For HFP units,
be sure clearances are maintained to the combustion air
inlet louvers and power exhauster discharge cover. Units
are designed for installation on non-combustible surfaces or
combustible surfaces with the minimum clearances shown in
Figure 3.1, Table 3.2, and Table 3.3.
multiply by
to obtain
0.24
kPa
6.893
kpa
°C
25.4
mm
0.305
meters
m 3 /min
0.028
m 3 /min
1.699
mJ/m 3
0.0374
0.453
kg
0.000293
kW/hr
3.785
liters
figure 3.1
combustible material and service clearances
TOP VIEW
HFP
A
ACCESS
SIDE
➀
➀ Minimum clearance to combustibles is 0.0'' from bottom of unit mounting rail or
3'' from bottom of sheet metal of unit casing.
➁ Minimum clearance to combustible for HFP is 1.0'' from rooftop.
table 3.2
combustible material clearances
model
front
size
& rear (b)
Hfg
75
0"
100/125
0"
150/175
3"
200/225
4"
250/300
5"
350/400
11"
table 3.3
service clearances
recommended
model
access
size
side
(a)
75
18"
100/125
20"
150/175
25"
200/225
27"
250/300
30"
350/400
41"
5-571.4
AIR FLOW
B
B
36"
27"
HFG
➁
C
clearance to
combustible materials
front
non-access
& rear (b)
side (c)
HfP
Hfg/HfP
3"
0"
3"
0"
3"
0"
4"
0"
5"
0"
11"
0"
service
clearance
non-
access
side (c)
6"
6"
6"
6"
6"
6"
NON-
ACCESS
SIDE
access
side (a)
Hfg
HfP
0"
3"
0"
3"
0"
3"
0"
3"
0"
3"
0"
3"
3
3
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