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Installation – Sterling QVEB User Manual

Page 5

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PUBLIC GARAGES: In repair garages, unit heaters
must be at least 8 feet (2.4m) above the fl oor. Refer to
the latest edition of NFPA No. 88B, Repair Garages.

In parking structures, unit heaters must be installed
so that the burner fl ames are located a minimum of 18
inches (457mm) above the fl oor or protected by a partion
not less than 18 inches (457mm) high. However, any unit
heater mounted in a parking structure less than 8 feet
(2.4m) above the fl oor must be equipped with an OSHA
approved fan guard. Refer to the latest edition of NFPA
88A, Parking Structures.

In Canada, installation must be in accordance with the
latest edition of CSA-B149 “Installation Codes for Gas
Burning Appliances and Equipment.”

AIR DISTRIBUTION: Direct air towards areas of

maximum heat loss. When multiple heaters are involved,
circulation of air around the perimeter is recommended
where heated air fl ows along exposed walls. Satisfactory
results can also be obtained where multiple heaters are
located toward the center of the area with heated air
directed toward the outside walls. Be careful to avoid
all obstacles and obstructions which could impede the
warm air distribution patterns. Heat throw distances are
presented in Figure 3 and Table 2.

Figure 3 - Heat Throw Distances

5

INSTALLATION

Do not install unit heaters in

corrosive or fl ammable atmospheres! Premature
failure of, or severe damage to the unit will result!

Avoid locations where extreme

drafts can affect burner operation. Unit heaters
must not be installed in locations where air
for combustion would contain chlorinated,
halogenated or acidic vapors. If located in such
an environment, premature failure of the unit
will occur!

Since the unit is equipped with an automatic gas ignition
system, the unit heater must be installed such that the gas
ignition control system is not directly exposed to water
spray, rain or dripping water.

NOTE: Location of unit heaters is related directly to
the selection of sizes. Basic rules are as follows:

MOUNTING HEIGHT: Unit Heaters must be installed at
a minimum of 8 feet (2.4m) above the fl oor, measured
to the bottom of the unit. At heights above 8 feet (2.4m),
less effi cient air distribution will result. Occasionally unit
heaters must be mounted at heights of 12 to 16 feet
(3.7 to 4.9m) in order to clear obstacles. When this is
the case, it is advisable to use centrifugal blower unit
heaters.

AIRCRAFT HANGARS: Unit Heaters must be installed
in aircraft hangars and public garages as follows: In
aircraft hangars, unit heaters must be at least 10 feet
(3.05m) above the upper surface of wings or engine
enclosures of the highest aircraft to be stored in the
hangar and 8 feet (2.44m) above the fl oor in shops,
offi ces and other sections of the hangar where aircraft
are not stored or housed. Refer to current ANSI/NFPA
No. 409, Aircraft Hangars. In Canada, installation is
suitable in aircraft hangars when acceptable to the
enforcing authorities.

NR = Not recommended

ft. 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000

(m) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5)

(117.1)

8

60 65 70 75 80 85 90 105

110

120

(2.4)

(18.3) (19.8) (21.3) (22.9) (24.4) (25.9) (27.4) (32.0) (33.5) (36.6)

10

54 56 60 64 68 72 78 90 95 100

(3.0)

(16.5) (17.1) (18.3) (19.5) (20.7) (21.9) (23.8) (27.4) (29.0) (30.5)

12

44 46 49 57 61 65 68 80 84 90

(3.7)

(13.4) (14.0) (20.7) (17.4) (18.6) (19.8) (20.7) (24.4) (25.6) (27.4)

15

NR NR 45 49 52 56 60 70 74 80

(4.6) NR

NR (22.6) (14.9) (15.8) (17.1) (18.3) (21.3) (22.6) (24.4)

20

NR NR NR NR 46 50 54 63 66 70

(6.1) NR

NR

NR

NR (14.0) (15.2) (16.5) (19.2) (20.1) (21.3)

“H”
Distance From
Floor to Bottom
of Unit

UNIT SIZE BTU/Hr (kW)

Table 2 - Standard Applications - Heat Throw Distances (Approximate)