Chromalox Big Red Book

Heating Cable

2256 HTM 2266 HTM High Temperature Maintenance Self-Regulating Electric Traced Tubing (cont’d.)

Technical Specifications Electrical Specifications Heater Type

Self-Regulating

Heater Insulation Fluoropolymer Max. Continuous Exposure Temp. (Power-On) 250˚F (121˚C) Max. Exposure Temp (Power Off) 366˚F (185˚C) Circuit Length

240 feet @ 120 VAC 480 feet @ 240 VAC

Bus Wire Size (AWG)

16

Power Output

5 watts/foot @ 50˚F 120 VAC or 240 VAC

Alternate Voltage

240 VAC self-regulating heaters may be operated at alternative voltages.

Adjustment Factor

208 VAC 78% 277 VAC 109%

Temperature Rating per N.E.C. 500

T3

2256 Self Regulating Heater - HTM

160

140

1/4” Tube

120

3/8” Tube

100

1/2” Tube

80

Tube Temp (˚F)

3/4” Tube

60

40

-40 -20 0 20 40 60 80

AMBIENT TEMP (˚F)

Product Specifications 2256/2266 HTM/HTM

Tube O.D. 1/4” 3/8” 1/2” 3/4” 1/4” 3/8” 1/2” 1/4” 3/8” 1/2”

Standard Wall Thickness***

Working Pressure @200˚F

Nominal Bundle O.D.

Nom. Wt Lbs/ft.

Max. Bend Radius

Material (1)

ASTM

.030” .032” .035” .049” .035” .035” .035” .040” .062” .062”

#122 DHP Copper #122 DHP Copper #122 DHP Copper #122 DHP Copper

B-68 B-75 B-68 B-75 B-68 B-75 B-68 B-75

1270 psi 880 psi 710 psi 660 psi 4470 psi** 2860 psi** 2100 psi** 75 psi** 50 psi** 75 psi**

1.35” 1.40” 1.50” 1.65” 1.35” 1.40” 1.50” 1.35” 1.40” 1.50”

0.4 0.5 0.6 0.9

8” 9”

10” 12”

316/316L-S/S WLD A-269 316/316L-S/S WLD A-269 316/316L-S/S WLD A-269

0.56 0.60 0.65 0.50 0.53 0.60

8” 9” 8” 9”

10”

PFA PFA PFA

D-6867 D-6867 D-6867

10”

Notes: Minimum recommended installation temperature for PVC -25˚F (-32˚C) ** Values given are for welded, seamless slightly higher

Standard Jacket is Black, 105˚C lead free, LT-FRPVC Alternate Jacket Materials – 125˚C FR-TPE, FRPE, FR-Urethane

***Heavier wall thickness available upon request

LTM Product Rating: 185˚F (85˚C) HTM Product Rating: 250˚F (121˚C)

(1) Other tube materials available

G-108