Pfannenberg FLH-TF Data Sheet

ELECTRO-TECHNOLOGY FOR INDUSTRY

Instruction Sheet for Pfannenberg FLH-TF Fan Heater w/ T-Stat

Pfannenberg Inc.

Subsidiary of the Pfannenberg Group

68 Ward Road --- Lancaster, NY 14086 --- Phone: [phone] --- Fax: [phone]

Internet: http://www.pfannenbergusa.com

ELECTRO-TECHNOLOGY FOR INDUSTRY

Dimensional Information:

Model Number	“A”	“B”	“C”
FLH-TF 125	5” (127mm)	4 3/16” (106mm)	5 ½” (140mm)
FLH-TF 200	5” (127mm)	4 3/16” (106mm)	5 ½” (140mm)
FLH-TF 400	7” (178mm)	6 3/16” (157mm)	7 ½” (191mm)
FLH-TF 800	7” (178mm)	6 3/16” (157mm)	7 ½” (191mm)

Heater Selection

The wattage requirement is determined from a consideration of the surface area, insulation properties of the enclosure or space and the temperature difference between the ambient and the enclosure. For small enclosures (less than 100 ft2 surface area) conservative values for heat losses are as shown in Table 1.

Example: To find wattage requirements in an uninsulated enclosure 2’ x 3’ x1’, which must be held at 40°F in a 10°F outdoor ambient, with internal electrical components that generate 80 watts.

Surface Area = 2[(2’ x 3’) + (2’ x 1’) + (3’ x 1’)] = 22 ft 2

From Table 1, an uninsulated outdoor enclosure requires 7 watts per square foot for each 10°F temperature difference. Temperature Difference = 40°F - 10°F = 30°F

Wattage Required = (30°F ÷ 10°F) x 7 W/ft 2 x 22 ft 2 = 462 watts

Heater Wattage = Wattage required - component wattage = 462 - 80 = 382 watts

Use one FLH-TF 400 rated at 400 watts. For enclosures requiring more than 800 watts, two or more PH heaters may be used.

TABLE 1 - WATTS/FT2 PER 10°F TEMPERATURE DIFFERENCE

	INDOORS	OUTDOORS
UNINSULATED	5	7
INSULATED (MIN. 1")	1	1.2

Pfannenberg Inc.

Subsidiary of the Pfannenberg Group

68 Ward Road --- Lancaster, NY 14086 --- Phone: [phone] --- Fax: [phone]

Internet: http://www.pfannenbergusa.com