Sterling QVSF User Manual download pdf (Page 5)

INSTALLATION

Do not install unit heaters in corro-

sive 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.

NOTICE: Location of unit heaters is related directly to

the selection of sizes (refer to Figure 2). Basic rules

are as follows:

Figure 2 - Heater Location

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

efficient air distribution will result. Occasionally unit

heaters must be mounted at heights of 12 to 16 feet (3.66

to 4.88m) in order to clear obstacles. When this is the

case, it is advisable to use centrifugal blower unit heaters.

If the unit heater to be mounted below 8 feet (2.4m) above

the ﬂ oor, the unit heater must be equipped with an OSHA

approved fan guard.

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 (3.0m)

above the upper surface of wings or engine enclosures

of the

highest aircraft to be stored in the hangar and

8 feet (2.4m) 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.

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 flames are located a minimum of

18 inches (457mm) above the floor or protected by a

partition 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 to 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 Table 2, and Figure 2A.

Figure 2A - Heat Throw Distances

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

UNIT SIZE BTU/Hr (kW)

“H”

NR = Not recommended H = Distance from ﬂ oor to bottom of the unit.

D2787

“H”

Unit

Heater

Floor Line

Table 2 - Standard Applications Heat Throw Distances (see ﬁ gure 2A)

1 2 3 4 5 6 7 8 9 10 ... 31 32

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Sterling QVSF User Manual Page 5

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