Fastrax Hellfire 900, Installation, Operation & Maintenance Instructions Manual

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H. HEATER SPECIFICATIONS
H.1 Performance
• Clears ice and snow from switches with up to 40-foot points or
longer. (Recommended heating, 10,000 to 22,500 BTU/hr per
foot of track coverage, based on severity of local climate).
• 2000 scfm of heated air delivered via a duct system, point
nozzles and track duct vents.
• Heat output range 204,000 to 900,000 BTU/hr LPG or 230,000
to 900,000 BTU/hr NG, field adjustable.
• Output air temperature limited to 193°C (380°F) maximum.
• Burner efficiency, minimum 95%.
• SCADA network connectivity via RS-485 communications port.
H.2 Gas Firing
Table 15 – Gas Firing
Propane Natural Gas
Input rating, BTU/hr
(kW)
204,000 - 900,000
(60 - 264)
230,000 - 900,000
(67 - 264)
Manifold pressure,
inches of water (kPa)
2.5 - 9.0
(0.62 - 2.24)
3.5 - 16.0
(0.87 - 3.99)
Supply pressure,
psig 1,2 (kPa)
5 - 20
(34 - 138)
1 With no more than 20% pressure drop, with all connected loads operating.
2 Inlet gas fitting, 1” NPT female.
H.3 Gas Conversion
1. Heaters are factory set for use with propane gas.
2. To convert to natural gas adjust gas pressure to within
nameplate rating. If higher output is required, select and
change the main gas pressure regulator spring, with
one supplied separately, and adjust within specifications
detailed above. Affix separate gas type plate supplied.
Reverse procedure to change back to original gas.
H.4 Electrical
Table 16 – Electrical
Voltage Phase Wiring
Running
Amps
1,2,3
Frequency
(Hz)
240 1 3 wire, L1, L2, N 12.5 60
208 3 4 wire, L1, L2, L3, N 10.3 60
460 3 3 wire, L1, L2, L3 4.8 60
575 3 3 wire, L1, L2, L3 3.9 60
1 On start up, peak in rush current is usually 6-8 times the running amp.
2 Current drops to running amperage after 4 seconds.
3 Three horsepower fan drive motor for all configurations.
H.5 Controls
Table 17 – Controls
Feature Description
Remote Start
Provide dry contract, rated for 24
V AC
0.5 amp.
Run and Alarm Indication
Contacts
Maximum 240
V AC
or 24V DC, 10 amp.
Magnetic Motor Starter
Coil voltage 120
V AC
.
Motor Thermal Overload
Protection
Single phase, reset located on motor.
Three phase, thermal overload relay
fastened to contactor.
Thermostatically limited output
air temperature, cycling
193°C (380°F) maximum, open on rise,
automatic reset.
Thermostatically limited output
air temperature, high limit
216°C (420°F) maximum, close on rise,
manual reset.
Flame Safety Relay
Honeywell Burner Control, RM7895A,
continuous pilot.
SCADA RS-485, MODBUS ASCII
Rail Thermostat
9°C (49°F) close on rise, automatic
reset.
H.6 Wiring Terminations
Table 18 – Wiring Terminations
Function Size Range Termination Type
Power
#14 to #2 AWG
copper
Barrier Terminal Block, Tubular
with clamping screw.
Control #22 to #4 AWG
AAR terminal posts, #14-24
UNS
RS-485
Communications
#22 to #4 AWG or
#26-#12 AWG
AAR terminal posts, #14-24
UNS or PCB plug in connector.
Tubular with clamping screw.
H.7 Safety Features
1. Minimum Air Pressure: Upon start up and request for
heat, the trial for ignition does not start until adequate
air pressure is developed. Burner is extinguished
immediately upon loss of air pressure.
2. High Temperature Limit: In the event the heated air
temperature exceeds 216°C (420°F), the burner is
extinguished, the heater is shut down and locked out. A
manual reset is required.
3. Loss of Flame: If, upon start up and request for heat,
the trial for ignition fails to light the burner, or the flame
signal is lost while heating, the burner is extinguished
immediately.
4. Ductwork Electrical Isolation: As per, AAR standards part
14.5.1D, “Recommended Design Criteria for Assembly and
Test of Insulated Track Fittings, Dielectric Requirements”,
ducting and nozzle connections are electrically isolated
to withstand a maximum of 3000V AC for 60 seconds to
eliminate possible interference with track circuits.