Ruffneck FX6-SD Series Explosion Proof Electric Air Heaters User Manual
- June 10, 2024
- Ruffneck
Table of Contents
Ruffneck FX6-SD Series Explosion Proof Electric Air Heaters
Product Information
The FX6SD Series ExplosionProof Electric Air Heaters are the next generation RuffneckTM explosion-proof electric air heaters, designed for severe duty applications that can lead to accelerated wear of electrical components and damage to the heater core. The FX6-SD is specifically designed for harsh environments including locations with fluctuating power quality, temporary power generation, high vibration, dirty or corrosive atmospheres, or extended maintenance intervals. The FX6-SD incorporates a dedicated shunt trip circuit breaker which operates independently 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 FX6-SD the safest and most robust explosion-proof unit heater available. FX6-SD heaters are CULUS approved for use in hazardous locations. The heaters come with NEMA type 7 & 9 enclosures, 75 amp industrial contactor with the severe- duty coil, industrial duty line circuit breaker with shunt trip and manual reset, built-in control transformer, terminals for optional thermostat connection, automatic reset bimetal high-limit, shunt trip high limit, copper bus bars, built-in fuse protects contactor coil, spare fuse located in the convenient holder, Arctic Duty Motor, liquid-filled lower tank, printed circuit board, 100 psig (690 kPa) pressure relief valve, primary pressure relief valve, and standard secondary pressure relief device.
Product Usage
- Before using the FX6SD Series ExplosionProof Electric Air Heaters, ensure that you have read and understood the user manual and safety instructions.
- Verify that the voltage and phase of the heater match your power supply.
- Install the heater in a suitable location as per the installation conditions mentioned in the user manual.
- Connect the heater to the power supply and ensure that all electrical connections are tight and secure.
- If using an optional thermostat, connect it to the terminals provided in the heater.
- Turn on the power supply and set the thermostat to the desired temperature, if applicable.
- The heater will start heating the air and maintain the desired temperature until turned off or until the thermostat reaches the set temperature.
- In case of any abnormality or malfunction, turn off the power supply and refer to the troubleshooting section in the user manual.
- Regularly inspect and maintain the heater as per the maintenance instructions provided in the user manual to ensure safe and efficient operation.
The FX6-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 FX6-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™ FX6-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 FX6-SD the safest and most robust explosion-proof unit heater available. FX6-SD heaters are CULUS approved for use in hazardous locations.
Table 5 – Performance Data for 60 Hertz FX6-SD cULus Temperature Code T3B 329°F (165°C)
Nominal Wattage|
Model
|
Voltage
|
Phase
| Total Current| Optional Built-in Disconnect Switch|
Air Temperature Rise
|
Btu/hr
---|---|---|---|---|---|---|---
kW| | | | | °F| °C
| | | A|
3
| FX6-SD-208160-030| 208| 1| 14.4|
DS
|
19.0
|
10.5
|
10,250
FX6-SD-208360-030| 208| 3| 8.3
FX6-SD-240160-030| 240| 1| 12.5
FX6-SD-240360-030| 240| 3| 7.2
FX6-SD-480160-030º| 480| 1| 6.3
FX6-SD-480360-030| 480| 3| 3.6
FX6-SD-600360-030| 600| 3| 2.9
5
| FX6-SD-208160-050| 208| 1| 24|
DS
|
31.6
|
17.6
|
17,050
FX6-SD-208360-050| 208| 3| 13.9
FX6-SD-240160-050| 240| 1| 20.8
FX6-SD-240360-050| 240| 3| 12
FX6-SD-480160-050º| 480| 1| 10.4
FX6-SD-480360-050| 480| 3| 6
FX6-SD-600360-050| 600| 3| 4.8
7.5
| FX6-SD-208160-075| 208| 1| 36.1|
DS
|
27.9
|
15.5
|
25,600
FX6-SD-208360-075| 208| 3| 20.8
FX6-SD-240160-075| 240| 1| 31.3
FX6-SD-240360-075| 240| 3| 18
FX6-SD-480160-075º| 480| 1| 15.6
FX6-SD-480360-075| 480| 3| 9
FX6-SD-600360-075| 600| 3| 7.2
10
| FX6-SD-208160-100*| 208| 1| 48.1| Not Available|
37.2
|
20.6
|
34,100
FX6-SD-208360-100| 208| 3| 27.8|
DS
FX6-SD-240160-100| 240| 1| 41.7
FX6-SD-240360-100| 240| 3| 24.1
FX6-SD-480160-100º| 480| 1| 20.8
FX6-SD-480360-100| 480| 3| 12
FX6-SD-600360-100| 600| 3| 9.6
15
| FX6-SD-208360-150| 208| 3| 41.6| Not Available|
27.1
|
15.1
|
51,200
FX6-SD-240160-150*| 240| 1| 62.5|
DS
FX6-SD-240360-150| 240| 3| 36.1
FX6-SD-480160-150º| 480| 1| 31.3
FX6-SD-480360-150| 480| 3| 18
FX6-SD-600360-150| 600| 3| 14.4
20
| FX6-SD-480160-200º| 480| 1| 41.7|
DS
|
36.1
|
20.1
|
68,250
FX6-SD-480360-200| 480| 3| 24.1
FX6-SD-600360-200| 600| 3| 19.2
25
| FX6-SD-480360-250| 480| 3| 30.1|
DS
|
22.0
|
12.2
|
85,300
FX6-SD-600360-250| 600| 3| 24.1
30
| FX6-SD-480360-300| 480| 3| 36.1|
DS
|
26.4
|
14.6
|
102,350
FX6-SD-600360-300| 600| 3| 28.9
35
| FX6-SD-480360-350| 480| 3| 42.1|
DS5
|
30.7
|
17.1
|
119,450
FX6-SD-600360-350| 600| 3| 33.7
See Model Coding, page 16 and Installation Conditions, page 14. Consult Terms
& Conditions of Sale or FX6 Owner’s Manual for warranty information.
Note: Exceeds the 48 amp circuit limit of NEC 424-22 º 480 V 1 Phase
units are certified Class I, Div. 1, Group D and Class II, Div. 1, Groups F
and G.
- Minimum conductor size for 86°F (30°C) ambient. Derate conductor for ambient temperature. Use minimum 90°C (194°F) insulation.
- Heater is functioning normally if at rated voltage the amp draw is within 10% of the value in this table.
- Operation at lower voltage will result in reduced heat output and amp draw.
- Add ”T” to model number when adding a built-in thermostat.
- Add ”D” to model number when adding a built-in disconnect switch.
- Add ”C” to model number for units with Heresite® coating.
- Add ”A” to model number for units with stainless-steel cabinet.
- Add “U” to model number for continuous fan.
Table 6 – Performance Data for 50 Hz FX6-SD – 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. Temperature Code T3B 329°F (165°F)
Nominal
Wattage (kW)
| | | | | Optional Built-in Disconnect Switch| Air Temperature Rise|
---|---|---|---|---|---|---|---
Model| Voltage| Phase| Total Current (A)| | | Btu/hr
| | | | °F| °C|
2.5| FX6-SD-220150-025|
220
|
1
| 11.4|
DS
| 19.7| 11.0| 8,550
4.2| FX6-SD-220150-042| 19.1| 33.2| 18.4| 14,350
6.3| FX6-SD-220150-063| 28.6| 28.5| 15.7| 21,500
8.4| FX6-SD-220150-084| 38.2| 37.8| 21.1| 28,700
12.6| FX6-SD-220150-126*| 57.3| Not Available| 27.5| 15.2| 43,000
2.8| FX6-SD-230150-028|
230
|
1
| 12.20|
DS
| 22.1| 12.3| 9,550
4.6| FX6-SD-230150-046| 20.0| 36.4| 20.2| 16,000
6.9| FX6-SD-230150-069| 30.0| 31.1| 17.2| 23,550
13.8| FX6-SD-230150-138*| 59.9| Not Available| 30.1| 16.6| 47,100
2.5| FX6-SD-380350-025|
380
|
3
| 3.8|
DS
| 19.7| 11.0| 8,550
4.2| FX6-SD-380350-042| 6.4| 33.2| 18.4| 14,350
6.3| FX6-SD-380350-063| 9.6| 28.5| 15.7| 21,500
8.4| FX6-SD-380350-084| 12.8| 37.8| 21.1| 28,700
12.5| FX6-SD-380350-125| 19.0| 27.2| 15.1| 42,700
20.9| FX6-SD-380350-209| 31.8| 22.0| 12.1| 71,350
2.8| FX6-SD-400350-028|
400
|
3
| 4.0|
DS
| 22.1| 12.3| 9,550
4.6| FX6-SD-400350-046| 6.6| 36.4| 20.2| 15,700
6.9| FX6-SD-400350-069| 10.0| 31.1| 17.2| 23,550
9.3| FX6-SD-400350-093| 13.4| 42.0| 23.2| 31,750
13.9| FX6-SD-400350-139| 20.1| 30.2| 16.7| 74,450
18.5| FX6-SD-400350-185| 26.7| 40.2| 22.3| 63,150
23.1| FX6-SD-400350-231| 33.3| 24.2| 13.5| 78,850
3.7| FX6-SD-415350-037|
415
|
3
| 5.1|
DS
| 29.3| 16.3| 12,650
7.5| FX6-SD-415350-075| 10.4| 33.8| 18.7| 25,600
14.9| FX6-SD-415350-149| 20.7| 32.5| 18.1| 50,850
22.4| FX6-SD-415350-224| 31.2| 23.5| 13.1| 76,450
4.2| FX6-SD-440350-042|
440
|
3
| 5.5|
DS
| 33.2| 18.4| 14,350
8.4| FX6-SD-440350-084| 11.0| 37.8| 21.1| 28,700
16.8| FX6-SD-440350-168| 27.5| 36.5| 20.3| 57,350
20.9| FX6-SD-440350-209| 27.5| 22.1| 12.2| 71,350
Note:
Exceeds the 48 amp. circuit limit of NEC 424-22.
-
Minimum conductor size for 86°F (30°C) ambient. Derate conductor for ambient temperature use minimum 194°F (90°C) insulation.
-
Heater is functioning normally if at rated voltage the amp draw is within 10% of the value in this table.
-
Operation at lower voltage will result in reduced heat output and amp draw.
Installation Conditions
- The FX6-SD Series Electric Air Heaters are for dry indoor use only. Do not immerse in water. Do not store or use in areas exposed to rain or snow.
- The FX6-SD heaters are to be used only in atmospheres having an ignition temperature higher than 329°F (165°C).
- Altitude restrictions apply – see specifications on next page.
-
Add ”T” to the model number when adding a built-in thermostat.
-
Add ”D” to the model number when adding a built-in disconnect switch.
-
Add ”C” to the model number for units with Heresite® coating.
-
Add ”A” to the model number for units with stainless-steel cabinets.
-
Add “U” to the model number for continuous fan.
- Heaters should be connected to a fixed power supply and must be permanently mounted in a level, upright position during operation.
- Read and be aware of the terms of our Warranty located in the owner’s manual.
- For more information please refer to the owner’s manual.
Table 7 – Specifications for 50 Hz FX6-SD
| Nominal kW
---|---
2.5| 3.7 & 4.6| 6.3 & 7.5| 8.4| 12.5 & 12.6| 14.9 & 16.7| 20.9| 22.4| 35
Maximum Altitude
| ft| 12,000| 8,000| 10,000| 7,000| 10,000| 7,000| 10,000| 7,000| 6,000
m| 3,658| 2,438| 3,048| 2,134| 3,048| 2,134| 3,048| 2,134| 1,829
Air Flow
| @ 70°F (CFM)| 400| 700| 1,450| 3,000
@ 21°C (m3/hr)| 679| 1,189| 2,463| 5,096
Horizontal Air
Throw
| ft| 13| 25| 35| 60
m| 4.0| 7.6| 10.7| 18.2
Maximum Mounting Height
(to underside)
| ft| 7| 10| 20
m
|
2.1
|
3.0
|
6.1
Minimum
Motor Power
| HP| 1/2
kW| 0.373
Fan Diameter
| in| 12| 16| 20
mm| 305| 406| 508
Net Weight
| without DS| lbs| 148| 177| 212
kg| 67.1| 80.2| 96.2
with DS
| lbs| 160| 189| 224
kg| 72.5| 95.6| 101.6
Shipping Weight
| without DS| lbs| 202| 227| 263
kg| 91.6| 103.9| 119.3
with DS
| lbs| 214| 239| 275
kg| 97| 108.3| 124.7
Note: For specifications common to all FX6-SD models, see Model Coding, page 16. Weights are an approximate maximum. Manufacturer reserves the right to replace motors with suitable alternates.
Table 8 – Specifications for 60 Hz FX6-SD
| Nominal kW
---|---
3| 5| 7.5| 10| 15| 20| 25| 30| 35
Maximum Altitude
| ft| 12,000| 8,000| 10,000| 7,000| 10,000| 7,000| 10,000| 7,000| 6,000
m| 3,658| 2,438| 3,048| 2,134| 3,048| 2,134| 3,048| 2,134| 1,829
Air Flow
| @ 70°F (CFM)| 500| 850| 1750| 3600
@ 21°C (m3/hr)| 850| 1444| 2973| 6116
Horizontal Air
Throw
| ft| 15| 30| 40| 70
m| 4.6| 9.1| 12.2| 21.3
Maximum Mounting Height
(to underside)
| ft| 7| 10| 20
m
|
2.1
| 3.0| 6.1
Minimum
Motor Power
| HP| 1/2
kW| 0.373
Fan Diameter
| in| 12| 16| 20
mm| 305| 406| 508
Net Weight
| without DS| lbs| 148| 177| 212
kg| 67.1| 80.2| 96.2
with DS
| lbs| 160| 189| 224
kg| 72.5| 95.6| 101.6
Shipping Weight
| without DS| lbs| 202| 227| 263
kg| 91.6| 103.9| 119.3
with DS
| lbs| 214| 239| 275
kg| 97| 108.3| 124.7
Note: For specifications common to all FX6-SD models, see Model Coding, page 16. Weights are an approximate maximum. The manufacturer reserves the right to replace motors with suitable alternates.
Model Coding
Reminder: This nomenclature illustration is intended primarily to explain how a product part number is defined. Not all voltage and/or wattage combinations are available – please consult the Performance Data chart(s) for product availability.
General Specifications
1. Hazardous Location Rating| 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, Group IIA & IIB
Temperature Code T3B 329ºF (165ºC)
---|---
2. Motor Type| Explosion-proof. Thermally protected TEFC Arctic Duty.
Permanently lubricated ball bearings.
3. Fan| Aluminum blade. Steel spider and hub with 5/8″ (15 mm) bore
4. Fan Guard|
Split design with close wire spacing. 1/4″ (6.3 mm) diameter probe will not enter
5. Mounting Holes
|
Four 5/8″ (15.9 mm) diameter holes at the top of heater
6. Heating Elements| Long-life metal-sheathed elements
7. 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
8. Control Circuit| 120 V, 0.128 amps, 15 VA. (Grounded)
9. Optional Built-in Thermostat| Explosion-proof 36ºF to 82ºF (2°C to 28°C)
10. Optional Built-in Thermostat| DS uses x-Max ® construction.
11. Contactor| Multiple voltage primary, 120 V secondary, 50 VA
12. Heat Transfer Fluid| Proprietary heat transfer fluid.
13. 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
14. Core| Steel with integral aluminum fins, vacuum charged and hermetically
sealed
15. Conduit Material|
Heavy wall, 0.122″ (3.1 mm), steel
16. Junction Box| 10.25″ (230 mm) x 8.00″ (180 mm) x 9.12″ (205 mm)
17. Circuit Protection| Industrial duty line circuit breaker with shunt trip
18. Field Connection| Two 1″ NPT
19. Overpressure Protection| Preset 100 psig (690 kPa) pressure relief valve,
no field serviceable parts. Preset 300 PSIG (2070 KPa) rupture disk, no field
servicable parts.
20.Operational Temperature Limitations| -58°F to 104°F (-50°C to 40°C)
21. Storage Limitations| -58°F to 176°F (-50°C to 80°C). Do not immerse in
water. Do not expose to rain or snow.
22. Weight (for 15 kW Unit)| 170 lbs (77.27 kg)
23.Weight with Disconnect (for 15 kW Unit)| 182 lbs (82.73 kg) W
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