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STANDARD FEATURES - page 7 / 10

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Page __________

of

__________

Clearances to Combustibles

Model VR

Required clearances depend on the size of the heater (BTUH input), the position of the reflector, and the addition of an optional side shield. The side shield is a field-installed, modular shield (2 pieces per 10 ft. tube length). The shield hangs vertically on the “rear” side only, along the entire length of a straight tubular system. Refer to Clearance Orienta- tion Illustrations to define “Top”, “Below”, “Front”, and “Rear” clearances. The clearances listed are installation requirements. In addition, ANSI Z-223.1, Section 6.18, requires that signs be posted specifying the maximum permis- sible stacking heights to assure that the required clearances from the heater to combustibles are maintained.

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 

in. mm

50 66 1,676

75 66 1,676

100 66 1,676

125 78 1,981

150 78 1,981

175 84 2,134

200 84 2,134

in. mm

12 305

12 305

12 305

12 305

12 305

12 305

12 305

Recommendations

BELOW

for Efficient

TOP*

Location

SIZE

CLEARANCES TO COMBUSTIBLES

Application

When selecting the installation loca- tion, major factors to consider are (1) Personal and Property Safety, (2) Personal Comfort, and (3) Heating Ef- ficiency. Because of the unique fea- tures of radiant heat transfer, select- ing the most efficient location for in- frared equipment depends on the “floor” coverage of the emitted heat rays. Floor coverage distance can be figured as approximately two times the mounting height of the unit. How- ever, comfort level heating depends on the infrared intensity and on the balance of the radiant emission over the length of the system. Infrared in- tensity decreases with higher mount-

0 - 30° WITH

FRONT

SIDE SHIELD

REAR

in. mm in. mm

in. mm in. mm

in. mm in. mm in. mm

VENT

FRONT

  • 0

    -30°

REAR

in. mm in. mm in. mm

FRONT

REAR

EXHAUST END

WITH REFLECTOR POSITIONED

31 - 45°

BURNER END

ALL HEATERS

HORIZONTAL HEAT CLEARANCES EXCHANGER

24

24

610

610

36

36

914

914

24

24

610

610

6

6

152

152

30

30

762

762

30

30

762

762

48

48

1,219

1,219

18

18

457

457

36

36

914

914

12

12

305

305

24

30

610

762

36

48

914

1,219

24

24

610

610

6

6

152

152

30

42

762

1,067

30

42

762

1,067

48

66

1,219

1,676

18

32

457

813

36

42

914

1,067

12

12

305

305

30

30

30

762

762

762

48

48

48

1,219

1,219

1,219

24

24

24

610

610

610

6

6

6

152

152

152

42

54

54

1,067

1,372

1,372

42

54

54

1,067

1,372

1,372

66

78

78

1,676

1,981

1,981

32

36

36

813

914

914

42

54

54

1,067

1,372

1,372

12

12

12

305

305

305

ing heights and greater floor cover- age. IMPORTANT: Another factor

  • *

    If Model VR is unvented, top clearance is 18 inches (457mm).

when locating the heater in relation to people is that the heat emitted from the burner/combustion chamber end of a tubular infrared heater is more intense that the heat emitted from the exhaust end. Configurations including an optional “U” tube provide the best balance of radiant emission over the length of the system.

For space heating infrared applications, the location of the unit must be evaluated as part of the heater size selection. In order to select the proper heater size, determine the total BTUs required, the floor coverage required, and the mounting height. From this information, design a heater size and location plan that will provide the most complete floor coverage without excessive overlapping. In most cases, perimeter heaters should be located parallel to the wall. The distance from the wall to the unit is determined by whether the reflectors will be angled, horizontal, or with side shields.

For spot heating applications, the tubular system should be located to direct the rays toward the area requiring heat. Depending on the installation, this can be done from directly overhead or reflector angled from the side. U-tube configurations are often best suited to overhead spot heating applications. Use the mounting height, the size of the heater, the heater configuration, and the application conditions to determine the most efficient location for the heater.

WARNING: GAS-FIRED APPLIANCES ARE NOT DE- SIGNED FOR USE IN HAZARDOUS ATMOSPHERES CONTAINING FLAMMABLE VAPORS OR COMBUS- TIBLE DUST, OR ATMOSPHERES CONTAINING CHLORINATED OR HALOGENATED HYDROCAR-

BONS. INSTALLATIONS IN PUBLIC GARAGES OR AIR- PLANE HANGARS ARE PERMITTED WHEN IN ACCOR- DANCE WITH ANSI Z83.6B AND NFPA-408 AND 88 CODES OR CANI-B149 CODES AND ENFORCING AU- THORITIES.

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