NOTE: THIS ITEM IS MADE TO ORDER AND NOT RETURNABLE. 

Temperature Code T3B [329°F (165°C)]

The FX5-SD is the next generation Ruffneck™ explosion-proof electric air heater, built for severe duty applications that can lead to accelerated wear of electrical components and damage to the heater core. The FX5-SD is specifically designed for severe duty applications including locations with:

• Fluctuating power quality
• Temporary power generation
• High vibration
• Dirty or corrosive atmospheres or
• Extended maintenance intervals

Only the Ruffneck™ FX5-SD incorporates a dedicated shunt trip circuit breaker which operates independent of the control circuit. It is triggered by a redundant heater core high temperature limit enabling primary interruption of line power to safely protect the heater core. Additional standard features include a definite purpose high capacity contactor, explosion-proof Arctic Duty motor and heavy gauge wiring to make the FX5-SD the safest and most robust explosion-proof unit heater available. FX5-SD heaters are CULUS approved for use in hazardous locations.

Class I, Division 1 & 2, Groups C & D
Class II, Division 1, Groups E, F & G
Class II, Division 2, Groups F & G
Class I, Zones 1 & 2, Groups IIA & IIB

Features

Motor Type Explosion-proof. Thermally protected TEFC Arctic Duty. Permanently lubricated ball bearings. Add “B” to model coding for certified use at low temperature -50°C (-58°F).

Fan Aluminum blade. Steel spider and hub with 5/8" (15 mm) bore

Fan Guard Split design with close wire spacing. 1/4" (6.3 mm) diameter probe will not enter

Mounting Holes Four 5/8" (15.9 mm) diameter holes at the top of heater

Heating Elements Long-life metal-sheathed elements

Temperature High-Limit Primary automatic reset type, snap-action bimetal, open on temperature rise. Rated 100,000 cycles at 15 amp, handles 0.128 amps/Secondary automatic reset type, snap‑action bimetal, close on temperature rise. Rated 100,000 cycles at 15 amp, handles 0.128 amps

Control Circuit 120 V, 0.128 amps, 15 VA. (Grounded)

Contactor Multiple voltage primary, 120 V secondary, 50 VA

Heat Transfer Fluid Propylene glycol and water

Cabinet Material 12-gauge (0.315" / 2.60 mm) epoxy powder coated steel. Optional Heresite® coating available for corrosive atmospheres with an optional stainless-steel casing (Call for assistance)

Core HD Core (Propylene Glycol) charge under vacuum

Conduit Material Heavy wall, 0.122" (3.1 mm), steel

Junction Box 10.25" (230 mm) x 8.00" (180 mm) x 9.12" (205 mm)

Circuit Protection Industrial duty line circuit breaker with shunt trip

Field Connection Two 1" NPT

Overpressure Protection Preset 100 psig (690 kPa) pressure relief valve, aluminum body, no serviceable parts

Operational Temperature Limitations -4ºF to 104ºF (-20ºC to 40ºC); for “B” units -58°F to 104°F (-50°C to 40°C)

Storage Limitations -58°F to 176°F (-50°C to 80°C), short term to 248°F (120°C). Do not immerse in water. Do not expose to rain or snow.

Weight (for 15 kW Unit) 170 lbs (77.27 kg)

Weight with Disconnect (for 15 kW Unit) 182 lbs (82.73 kg) W

Optional Built‑in Disconnect Switch DS5 for use only on heaters with total current not exceeding 48 amps. Lockout handle accepts 1/4" diameter padlock shackle 

Optional Built-in Thermostat Explosion-proof 36ºF to 82ºF (2°C to 28°C)

Optional Built-in Thermostat DS5 uses x-Max® construction.