Trane Gas Unit Heaters Installation Manual download pdf (Page 12)

12 GHND-SVX01C-EN

Installation: Mechanical

Since the unit is equipped with an automatic gas ignition

system, the unit heaters 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 (refer to Figure 7). Basic rules are

as follows:

Mounting Height. Unit heaters must be installed at a

minimum of 8 feet (2.4 m) above the floor, measured to the

bottom of the unit. At heights above 8 feet (2.4 m), less

efficient air distribution will result. Occasionally unit

heaters must be mounted at heights of 12 to 16 feet (3.7 to

4.9 m) in order to clear obstacles. When this is the case, it

is advisable to use centrifugal blower unit heaters.

Aircraft Hangers. Unit heaters must be installed in

aircraft hangars and public garages as follows: in aircraft

hangars, unit heaters must be at least 10 feet (3.0 m) above

the upper surface of wings or engine enclosures of the

highest aircraft to be stored in the hangar, and 8 feet

(2.4 m) above the floor in shops, offices 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

located at least 8 feet (2.4 m) above the floor. Refer to the

latest edition of NFPA 88B, Repair Garages.

In parking structures, unit heaters must be installed so that

the burner flames are located a minimum of 18 inches

(457 mm) above the floor or protected by a partition not

less than 18 inches (457 mm) high. However, any unit

heater mounted in a parking structure less than 8 feet

(2.4 m) above the floor 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 CSAB149 “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 flows 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, p. 12 and

Figure 8.

NOTICE:

Equipment Damage!

Do not install unit heaters in corrosive or flammable

atmospheres! Premature failure of, or severe damage to

the unit could 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 could occur!

Figure 7. Heater location

Table 2. Standard applications approximate heat throw distances (see Figure 8)

“H”

(a)

Unit Size Btu/h (kW)

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 60657075808590105110120

(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)

Note: NR = Not recommended.

(a) H = Distance from floor to bottom of the unit.

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Trane Gas Unit Heaters Installation Manual Page 12

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