Ruffneck FX6-SD Series Explosion Proof Electric Air Heaters User Manual

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

1. Before using the FX6SD Series ExplosionProof Electric Air Heaters, ensure that you have read and understood the user manual and safety instructions.
2. Verify that the voltage and phase of the heater match your power supply.
3. Install the heater in a suitable location as per the installation conditions mentioned in the user manual.
4. Connect the heater to the power supply and ensure that all electrical connections are tight and secure.
5. If using an optional thermostat, connect it to the terminals provided in the heater.
6. Turn on the power supply and set the thermostat to the desired temperature, if applicable.
7. The heater will start heating the air and maintain the desired temperature until turned off or until the thermostat reaches the set temperature.
8. In case of any abnormality or malfunction, turn off the power supply and refer to the troubleshooting section in the user manual.
9. 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.

1. Minimum conductor size for 86°F (30°C) ambient. Derate conductor for ambient temperature. Use minimum 90°C (194°F) insulation.
2. Heater is functioning normally if at rated voltage the amp draw is within 10% of the value in this table.
3. Operation at lower voltage will result in reduced heat output and amp draw.
4. Add ”T” to model number when adding a built-in thermostat.
5. Add ”D” to model number when adding a built-in disconnect switch.
6. Add ”C” to model number for units with Heresite® coating.
7. Add ”A” to model number for units with stainless-steel cabinet.
8. 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.

1. Minimum conductor size for 86°F (30°C) ambient. Derate conductor for ambient temperature use minimum 194°F (90°C) insulation.

2. Heater is functioning normally if at rated voltage the amp draw is within 10% of the value in this table.

3. 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.

4. Add ”T” to the model number when adding a built-in thermostat.

5. Add ”D” to the model number when adding a built-in disconnect switch.

6. Add ”C” to the model number for units with Heresite® coating.

7. Add ”A” to the model number for units with stainless-steel cabinets.

8. 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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