Minimum Steady
Maximum Heat
State Thermal
Release (BTU
Efficiency
Per Square Foot
(Percent)
of Heating
Surface
Single-Burner
80
2,900
Vacuum Vented
Heater
Multiple-Burner
85
2,100
Vacuum Vented
Heater
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Provide sufficient radiant heating surface to attain a minimum steady-state
thermal efficiency of [80] [85] percent and a maximum heat release of
[31,350] [33,060] [23.940] kJ per square meter [2,750] [2,900] [2,100] Btu
per square foot.
2.2.4
Electric Infrared Heater
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NOTE: Check if Section 15768, "Electric Space
Heating Equipment," covers electric unit heater.
Recommend to cover unit heaters exclusively in this
section. Avoid redundant statement.
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Self-contained, factory assembled, and UL listed and including the heating
element, reflector, heater housing, mounting brackets, element holders,
wire guards, and high-temperature internal wiring.
2.2.4.1
Heating Element
Minimum 9 1/2 mm 3/8 inch diameter quartz tube or metal sheath with coiled
resistor wire. Element operating temperature range shall be 649 to 982
degrees C 1200 to 1800 degrees F.
2.2.4.2
Heater Housing
[Weatherproof] [aluminum-clad steel] [stainless-steel] [aluminum] [or]
[low-carbon steel] construction. Provide a baked enamel finish over a
corrosion-resistant primer. Provide a chrome-plated or stainless-steel
wire guard to prevent heating elements from accidental damage. Furnish
swivel brackets to position heater in any horizontal angle.
2.2.4.3
Reflector
Polished [aluminum] [or] [stainless steel].
2.2.4.4
Wiring
Fully enclosed internal wiring. Provide minimum 152 mm 6 inchslack fixture
(heater) wire for connection to branch circuit wiring.
SECTION 15760N
Page 12
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