Railway Equipment 955 User manual

P/N R9550-0100 1 © 2018 RAILWAY EQUIPMENT CO.
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OPERATING MANUAL
MODEL NO. 955 STANDARD
&
MODEL NO. 954 LOW PROFILE
3 HP
230V 1 PHASE
230V 1 PHASE AC DRIVE
460V/575V 3 PHASE
GAS FIRED HOT AIR BLOWER
TRACK SWITCH SNOW MELTER
WITH STEEL TIE DUCT
MANUFACTURED
BY
RAILWAY EQUIPMENT COMPANY
15400 MEDINA ROAD
PLYMOUTH, MINNESOTA 55447
TEL. [phone]
FAX. [phone]
E-Mail:
Technical Support: [email protected]
Sales: [email protected]

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CAUTION
GENERAL HAZARD WARNING
FAILURE TO COMPLY WITH THE PRECAUTIONS AND INSTRUCTIONS
PROVIDED WITH THIS HEATER, CAN RESULT IN DEATH, SERIOUS INJURY
AND PROPERTY LOSS OR DAMAGE FROM HAZARDS OF FIRE,
EXPLOSION, BURN, ASPHYXIATION, CARBON MONOXIDE POISONING,
AND/OR ELECTRICAL SHOCK.
ONLY PERSONS WHO CAN UNDERSTAND AND FOLLOW THESE
INSTRUCTIONS SHOULD USE OR SERVICE THIS HEATER.
IF YOU NEED ASSISTANCE OR HEATER INFORMATION, SUCH AS
INSTRUCTION MANUALS, LABELS, ETC., CONTACT THE
MANUFACTURER.
CAUTION
WARNING: FIRE, BURN, INHALATION, AND EXPLOSION HAZARD.
KEEP SOLID COMBUSTIBLES, SUCH AS BUILDING MATERIALS, PAPER OR
CARDBOARD, A SAFE DISTANCE AWAY FROM THE HEATER AS
RECOMMENDED BY THE INSTRUCTIONS. NEVER USE THE HEATER IN
SPACES WHICH DO OR MAY CONTAIN VOLATILE OR AIRBORNE
COMBUSTIBLES, OR PRODUCTS SUCH AS GASOLINE, SOLVENTS, PAINT
THINNER, DUST PARTICLES OR UNKNOWN CHEMICALS.

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CAUTION
NOT FOR HOME OR RECREATIONAL VEHICLE USE
The heater is designed and approved for use as a construction heater under ANSI
Z83.7
We cannot anticipate every use which may be made of our heaters.
CHECK WITH LOCAL FIRE SAFETY AUTHORITY IF YOU HAVE QUESTIONS
ABOUT APPLICATIONS.
Other standards govern the use of fuel gases and heat producing products in specific
applications. Your local authority can advise you about these.

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PLEASE READ THIS INSTRUCTION MANUAL ENTIRELY BEFORE
HANDLING THIS MATERIAL OR ATTEMPTING TO INSTALL, OPERATE
OR SERVICE THIS HOT AIR BLOWER SYSTEM.
PLEASE READ THE WARNINGS AND CAUTIONS LISTED BELOW.
CAUTION
CAUTION
CAUTION
CAUTION
CAUTION
SHEET METAL EDGES MAY BE VERY SHARP AND CAN
CAUSE SEVERE CUTS OR LACERATIONS. PROTECTIVE
GLOVES AND CLOTHING SHOULD BE WORN. USE
CAUTION WHEN HANDLING ALL SHEET METAL
COMPONENTS.
THE HOT AIR BLOWER TRACK SWITCH SNOW MELTER
SYSTEM CAN BE OPERATED REMOTELY OR BY A SNOW
DETECTOR SYSTEM. THEREFORE, OPERATION MAY
BEGIN UNEXPECTEDLY. USE CAUTION WHEN IN THE
AREA.
SYSTEM OPERATES WITH VARIOUS VOLTAGE LEVELS
UP TO 600VAC. CONTACT WITH ELECTRICITY CAN BE
HAZARDOUS OR LETHAL. MAKE SURE THAT THE MAIN
CIRCUIT BREAKER IS TURNED OFF BEFORE
ATTEMPTING TO SERVICE THIS SYSTEM. EVEN WITH
CIRCUIT BREAKER OFF LINE VOLTAGE IS PRESENT AT
THE TOP CIRCUIT BREAKER CONNECTIONS.
THIS SYSTEM CONTAINS A HIGH SPEED AIR FAN
WHICH ROTATES AT UP TO 3600RPM AND CREATES
FORCEFUL SUCTION WHEN OPERATING. DO NOT
OPERATE THE BLOWER SYSTEM IF ANY OF THE
DUCTWORK COMPONENTS HAVE BEEN REMOVED.
THIS SYSTEM OPERATES WITH NATURAL GAS OR
PROPANE. BOTH ARE GASES WHICH ARE FLAMMABLE
AND EXPLOSIVE. USE EXTREME CAUTION WHEN
WORKING IN THE AREA. AVOID ANY OPEN FLAME,
SPARKS OR OTHER SOURCE OF IGNITION.

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CAUTION
A HIGH TEMPERATURE LIMIT SYSTEM HAS BEEN INCORPORATED INTO ALL
RAILWAY EQUIPMENT COMPANY GAS SNOW MELTER SYSTEMS BEGINNING IN
1999. RAILWAY EQUIPMENT COMPANY ALSO HAS A HIGH TEMPERATURE LIMIT
MODIFICATION KIT THAT CAN BE ADDED TO GAS SNOW MELTER SYSTEMS
MANUFACTURED PRIOR TO 1999. IT IS RECOMMENDED THAT THIS HIGH
TEMPERATURE LIMIT SYSTEM BE INSTALLED AND USED. CONSULT RAILWAY
EQUIPMENT TO ORDER THE HIGH TEMPERATURE MODIFICATION KIT, OR IF
YOU NEED ASSISTANCE REGARDING THE HIGH TEMPERATURE LIMIT SYSTEM.
THIS SNOW MELTER SYSTEM HAS BEEN DESIGNED TO PROVIDE DEPENDABLE
EFFECTIVE OPERATION IN ALL WEATHER CONDITIONS WITHOUT SWITCH COVERS.
SWITCH COVERS MAY CAUSE HIGHER AIR TEMPERATURES. IF SWITCH COVERS
ARE USED, YOU MUST DETERMINE A SAFE OPERATING AIR TEMPERATURE AND
ADJUST BURNER PARAMETERS ACCORDINGLY. ADJUSTMENT OF BURNER
PARAMETERS MAY NEGATIVELY AFFECT BURNER PERFORMANCE AND
COMBUSTION CHARACTERISTICS TO THE EXTENT THAT THE BURNER MAY BE
UNABLE TO MAINTAIN COMBUSTION. CONSULT RAILWAY EQUIPMENT COMPANY
REGARDING BURNER OPERATING PARAMETERS.
TWO (2) COMPLETE INSTRUCTION MANUALS HAVE BEEN INCLUDED WITH THIS
SNOW MELTER SYSTEM. PLEASE KEEP ONE OF THE MANUALS WITH THE SYSTEM
AFTER INSTALLATION. ANYONE OPERATING OR SERVICING THIS SNOW MELTER
SYSTEM SHOULD READ THE MANUAL ENTIRELY BEFORE PROCEEDING.
IF YOU HAVE ANY QUESTIONS CONCERNING THE MANUFACTURE, DESIGN,
FUNCTION, INSTALLATION, OPERATION OR MAINTENANCE, CONTACT
RAILWAY EQUIPMENT COMPANY BEFORE PROCEEDING.
THE OUTLET AIR TEMPERATURE FROM THIS GAS
SNOW MELTER SYSTEM SHOULD NOT EXCEED 375°F
FROM ANY NOZZLE OR DUCT. DO NOT OPERATE
THIS BLOWER SYSTEM IF THE OUTLET
TEMPERATURE EXCEEDS 375°F. AN ACCURATE
THERMOMETER SHOULD BE USED TO REGULARLY
CHECK THE OUTLET AIR TEMPERATURE. IF THE
OUTLET TEMPERATURE EXCEEDS 375°F, CHECK TO
MAKE SURE THAT THE FLOW OF AIR IS NOT
RESTRICTED AT ANY POINT, THAT THE
BLOWER/MOTOR ARE OPERATING PROPERLY, THAT
THE CORRECT ORIFICE IS USED FOR THE TYPE OF
FUEL USED, AND THAT THE REGULATOR(S) ARE
PROPERLY ADJUSTED FOR THE FUEL BEING USED.
CONSULT RAILWAY EQUIPMENT COMPANY IF YOU
ARE UNABLE TO OPERATE THIS GAS SNOW MELTER
SYSTEM BELOW 375°F.

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TABLE OF CONTENTS
I. GENERAL INFORMATION 8
A. MODEL NUMBER DESCRIPTION 8
B. STANDARD FEATURES 8
II. COMPONENT DESCRIPTION 10
A. MAIN HAB UNIT 10
B. STANDARD DUCTWORK 11
C. OPTIONAL DUCTWORK 12
III. INSTALLATION 14
A.TIEDUCT 14
B.MAINHABUNIT 15
C. POINT NOZZLES AND TRACK DUCTS 16
D.GASCONNECTION 17
E. CHANGING THE GAS ORIFICE 21
F. ELECTRICAL CONNECTION 22
IV. CONTROL MODULE 24
A.DESCRIPTION 24
B. SET-UP AND ADJUSTMENTS 25
C. LED STATUS INDICATING LIGHTS 33
D. OPERATION 34
E. FAULT CONDITIONS 35
V. SEASONAL MAINTENANCE 38
VI. LOW PRESSURE REGULATOR ADJUSTMENT 39
VII. TROUBLESHOOTING 40
A. UNIT DOES NOT START 40
B. UNIT DOES NOT MAINTAIN OPERATIONS 40
C. LOW HEAT LEVEL 40
D.LOWAIRFLOW 41
E.GASVALVE 41
F. HIGH HEAT LEVEL 41
VIII. SNOW DETECTOR 42
A.INSTALLATION 42
B.OPERATION 43
C.MAINTENANCE 43
D. TROUBLESHOOTING 44

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IX.SPECIFICATIONS 45
X.DRAWINGS 46
XI. LIMITED WARRANTY 47

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I. GENERAL INFORMATION
A. MODEL NUMBER DESCRIPTION
OPTIONS
0= STANDARD
1= GE IN TIE SWITCH
2= GE SNF IN TIE SWITCH
3= TRACK DUCT NOZZLES FOR SNF DUCT
4= 3/5 PANEL CONFIGURED
10X10 ADAPTOR FLANGE
AND NOZZLE (NO TIE DUCT)
5= 2HP PANEL CONFIGURED
10X10 ADAPTOR FLANGE
AND NOZZLES (NO TIE DUCT)
6= 2HP USING 10X10 TIE DUCT
7= STANDARD WITH FLEX NOZZLES
REVISION
LEVEL
XXX X X X 9 XXX
GAS
ASSEMBLY
3= DUAL STAGE WITH SENSORS
4= DUAL STAGE WITH SENSORS
AND TANK LEVEL
OUTLET DUCT
K= STEEL TIE DUCT WITH 115# PLATES 9'
N = STEEL TIE DUCT WITH 136# PLATES 9'
G= STEEL TIE DUCT WITH 115# PLATES FOR SNF
H= STEEL TIE DUCT WITH 136# PLATES FOR SNF
T= NO TIE DUCT
C- CUSTOM TIE DUCT
9= LARGE TRACK
DUCT NOZZLE
OPENING
TRACK DUCT LENGTH
0 = NO TRACK DUCT
1= 10' TRACK DUCT
2= 20' TRACK DUCT
3= 30' TRACK DUCT
4= 40' TRACK DUCT
5= 15' TRACK DUCT
MODEL
950 2HP High Profile
951 2HP Low Profile
952 5HP Low Profile
953 5HP High Profile
954 3HP Low Profile
955 3HP High Profile
960 2HP Bungalow Enclosed
963 5HP Bungalow Enclosed
2009 Gas Hot Air Blowers
2.13.09 TM
INCOMING
POWER
2= 230VAC 1PH
3 = 230VAC 3PH
4= 480VAC 3PH
5= 575VAC 3PH
6= 230VAC 1PH
with 3PH Drive
B. STANDARD FEATURES OF TRACK SWITCH HOT AIR BLOWER
1. GHAB complies with AREMA 12.6.10.
2. Gas fired operation, allows for both propane and natural gas
(convertible in the field)
3. Two stage operation that allows savings on fuel costs. Second stage runs
at 50% output of the first stage.
4. Direct drive motor, totally enclosed fan cooled.
5. High efficiency, quiet operation blower.
6. Remote operation via contact closure (low voltage, low current) with
timed shut off.
7. Built-in snow detector system (requires Snow Detector assembly option).
8. Auto-Off-Local switch.
9. High temperature limit thermostat/shut off.
10. Adjustable air temperature control.
11. Adjustable rail temperature control.
12. Reply indication via GHAB contact closure.
13. Fail indication via GHAB contact closure.
14. Main circuit breaker.
15. Audible tone before blower startup
16. Weather tight gasketed control enclosure
17. Status indicating lights for all control functions

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18. Start delay timer for sequential startup
19. Run timer for timed operation
20. Selectable "Transparent" snow detector operation
21. Snow detect timer
22. All ductwork and nozzles are thermally and electrically isolated from
tracks
23. Quick-release track duct
24. Blower motor starter with overload protection
25. Remote auxiliary gas valve (115vac) supplied connection
26. Gas line accessories:
A. Manual gas valve
B. Gas line strainer
C. Low pressure regulator
D. Flexible gas line connection pipe
27. Elevated air intake
28. Adjustable delay for start up (10 Sec. -5 Min.)
29. Complete flame safeguard control:
A. Pre-ignition air purge.
B. Air flow proving switch
C. Direct spark ignition
D. Flame proving sensor
E. Post shut off air purge 4 Min.
F. Automatic shut off on loss of flame or air flow
G. Leaky gas valve detection
H. Automatic retry on flame loss
I. Automatic reset on flame safeguard control
J. All flame safeguard controls CSA listed.
30. All components mounted and wired within main unit – no external wiring
required except for remote control, indications, optional snow
detectors, external gas valve and rail temp sensor.
31. Galvanized case constructed of 14-gauge steel, high temperature powder
coated finish.
32. Convenient panel access to high efficiency burner, flame sensor and spark
igniter.
33. Galvanized steel adjustable mounting foundations.
34. Standard ductwork: flame duct with straight insulated flexible
duct and heavy duty insulated offset duct connects to main tie duct
electrically insulated between rails, 24 inch (minimum) switch point
nozzles.
The following items are recommended for use with propane gas service:
Tank "pigtail" with POL/POL fittings (P/N 45038-12” or 60127-36”)
High pressure regulator (P/N 45103)
Gas line strainer (P/N 45040)
Remote solenoid valve (P/N 45036) OR
Complete Propane Package (P/N 9458-0100)

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II. COMPONENT DESCRIPTION
A. MAIN HOT AIR BLOWER (HAB) UNIT
1. MAIN CIRCUIT BREAKER: Provides main over-current protection and
manual on-off control of electrical power.
2. MOTOR CONTACTOR: Provides automatic blower motor control, with high
current contacts.
3. MOTOR OVERLOAD RELAY: Protects the blower motor from an over-
current condition.
4. CONTROL MODULE: Provides complete control of operation. See separate
description and details, section IV.
5. CONTROL TRANSFORMER: Provides control power for the control module
and other control components. The multi-tapped secondary provides, 36VAC CT
and 17VAC CT. The primary has 115VAC input plus a 230VAC step-up winding
and 12.6 VAC CT windings.
6. IGNITION TRANSFORMER: Provides 6000VAC to the spark igniter during
the ignition sequence.
7. AIRFLOW SWITCH: Located in the flame duct, the pressure switch indicates
proper airflow before and during burner operation.
8. BURNER: Contains the actual flame. Also holds the spark igniter and the flame-
sensing rod.
9. PROPANE/NATURAL GAS ORIFICE PLATE: Controls the rate of flow of
gas to the burner.
10. SPARK IGNITER: The spark plug type igniter provides spark for the burner.
The spark igniter is momentary - sparks only until the flame has been established.
11. FLAME DETECTION ROD: The flame detection rod monitors the flame at the
burner nozzle using the rectification principle. This provides a signal to the
control module if a proper flame exists.
12. AIR TEMPERATURE SENSOR: This is a thermocouple sensor for monitoring
the ambient air temperature. The flexible magnetic end of the sensor should be
placed so it is shaded by the GHAB unit, generally on the north side.

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13. RAIL TEMPERATURE SENSOR: This is a thermocouple sensor for
monitoring the actual rail temperature.
14. GAS VALVE: These are electric solenoid valves which control the flow of gas
for burner operation. It is controlled directly from the control module.
15. BLOWER MOTOR: The motor is totally enclosed and fan cooled.
16. BLOWER: The high efficiency blower wheel is dynamically balanced for
smooth and quiet operation.
17. BUZZER: The buzzer will sound a 10-second tone immediately before the
motor contactor is energized.
B. STANDARD DUCTWORK
1. HEAT DUCT: The first section of ductwork attached to the main HAB unit.
This duct contains the burner, air flow switch, spark igniter and the duct pressure
sensor.
2. FLEX DUCT: Connects the heat duct to the offset duct. It is a section of
flexible duct, enclosed in an insulated sheet metal wrapper.
3. HEAVY DUTY OFFSET DUCT: Connects the flex duct to the tie outlet duct.
This duct provides an 8” offset and encloses the air mixer.
4. TIE OUTLET DUCT: The outlet duct extends under the rails in place of a tie
and directs the airflow to the point nozzles and track ducts. The rail attaches to
the duct using tie plates and E clips. The tie plates are electrically insulated from
the rail using an insulating kit. There are six openings in the top for point nozzles
and track duct nozzles. Refer to the drawing page for the duct layout.
5. TRACK DUCTS: These ducts rest on brackets on the ties and the outlet duct.
They are installed over the track duct nozzles. The track ducts consist of a 5’
point, a 5’ mid, and 10’ sections to complete the desired length.
6. TRACK DUCT NOZZLE: Attaches to the inner two rectangular openings on
the top of the outlet duct. Directs airflow down the length of the switch through
the track ducts.
7. TRACK DUCT NOZZLE ISOLATING KIT: This is an electrically insulating
gasket with insulating washers and hardware to provide isolation between the
nozzles and the outlet duct. Refer to drawing 9278-0027 for proper installation.

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8. QUICK CHANGE NOZZLE PLATE: This plate allows for quick removal or
installation of nozzles to the tie duct, by simply loosening of four bolts the nozzle
assembly can be removed or installed.
9. TRACK DUCT SUPPORT BRACKET: These brackets are used to secure the
track duct in position. Refer to drawing 92774.
10. SWITCH POINT NOZZLE: These nozzles direct heated air down the switch
point. They are mounted on the outlet duct. They can be adjusted for proper
airflow direction. Nozzles may be shortened by up to 10” for proper fit.
11. POINT NOZZLE ISOLATING KIT: This is an electrically insulating gasket
with insulating washers and hardware to provide isolation between the nozzles
and the outlet duct. Refer to drawing 9278-0021 for proper installation.
C. OPTIONAL DUCTWORK
1. EXTENSION DUCTS: Extension ducts of various lengths are available to meet
specific requirements. These are insulated and enclosed in a metal wrapper.
Make sure the duct is mounted in the correct orientation, as there is an access
opening underneath the insulating wrapper cover. If additional duct extensions
are required, this assembly can be added between the outlet duct and the offset
duct.
2. 7’ TRACK DUCT: These track ducts are seven feet long. They are often
mounted outside of the track near the switch machine. A kit is available (P/N
9278-0270) that includes a 7’ track duct, a track duct nozzle and a track duct
isolation kit.
OTHER DUCTWORK ASSEMBLIES ARE AVAILABLE. CONSULT THE
FACTORY FOR SPECIAL DUCTWORK NEEDS.

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(INTENTIONALLY LEFT BLANK)

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III. INSTALLATION
INSTALLATION SHOULD BE DONE IN THIS ORDER:
A. TIE DUCT OUTLET DUCT/OFFSET DUCT
B. MAIN HAB UNIT/FLEX DUCT
C. POINT NOZZLES AND TRACK DUCTS
D. GAS
E. CHANGING THE GAS ORIFICE
F. ELECTRICAL
A. TIE DUCT
1. Remove the appropriate tie. Choose the tie that will result in the point nozzles
being as close to the switch point as possible without interfering with normal
switch operation. The distance from the center of the tie duct to the end of the
point nozzles is 33”. If necessary, up to 10” may be cut off each point nozzle.
2. Remove sufficient ballast to provide at least 14” clearance from the bottom of the
rails.
3. Carefully slip the tie duct under the rails and position it so that the rails are
directly above the tie plates. Ensure that the tie duct is centered between the
adjacent ties.
4. Place a rubber pad on the tie plate, then using a suitable lever, raise one end of the
tie duct until the rail lies correctly on the pad on the tie plate. Place two e-clip
insulators, one on each side of rail, in place and then fasten the rail to the tie plate
using two of the four 927248 rail clips. Use a heavy hammer or maul to drive the
clips securely into place.
5. While keeping the tie duct supported in place, firmly pack ballast under the tie
duct from the rail out to the end.
6. Repeat steps 4 and 5 for the other end of the tie duct.
7. a. Remove the end flange plate nearest the HAB by loosening the six
retainer bolts.
b. Install the two-foot heavy duty offset duct (P/N 9278-3403) to the tie duct
using hardware and gasket supplied with the offset duct.
PLEASE READ THROUGH THE ENTIRE
INSTRUCTIONS BEFORE BEGINNING INSTALLATION.

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8. Firmly repack ballast under the entire tie duct.
B. MAIN HAB UNIT
1. The main HAB unit has four slotted mounting holes on 15-1/2” x 34-1/2” centers.
2. Refer to Foundation Assembly drawing for the assembly of the optional
mounting foundation.
3. Use the provided GHAB positioning drawings to determine the approximate
position and height of the mounting foundation. The top of the foundation should
be placed 4"-6" below the height of the ties. This will allow final adjustment of
the HAB unit. NOTE: The drawing shows a standard HAB unit, but can be
used for the low profile series, also.
4. Excavate and place the foundation in its proper location.
5. Refer again to the drawing of the Foundation Assembly, detail A, showing the
mounting bolt arrangement. Attach four 3/4-10 x 8" hex bolts in the slotted holes
of the blower base, using a washer on each side of the blower base and a hex nut.
6. Thread a hex nut about halfway onto each bolt.
7. Place the blower unit on the foundation using a flat washer on the top and bottom
of the foundation and another hex nut on the bottom. The slotted holes in the
foundation will allow for side-to-side adjustment, and the slotted holes in the
HAB base will allow front-to-back adjustment. However, do not tighten the
mounting nuts yet.
8. Install the 30” flex duct onto the HAB flame duct.
9. Now adjust the HAB unit side to side, up or down, and forward or backward to
obtain the proper alignment of the heat duct to the offset duct. It may be
necessary to adjust the position of the offset/outlet duct assembly. The
adjustments should be made so that there is no stress on any of the ductwork, also
flex duct should measure 30”. Again, leave the mounting nuts loose for now.
10. Connect the other end of the flex duct to the HD offset duct.
11. With all components in the proper position, the foundation nuts may
now be tightened.
12. The fill can now be replaced around the mounting foundations.

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13. Adjustable air intake screens. To start the GHAB in a new location, set the
intake screens in the closed position. If there is a moisture problem, where frost
builds up on the intake screens, the intake screens can be set in the open position
to improve the airflow into the blower.
C. POINT NOZZLES AND TRACK DUCTS
REFER TO THE GHAB POSITIONING DRAWING FOR TRACK DUCT
AND POINT NOZZLE POSITIONS.
LH AND RH POINT/TRACK NOZZLE ASSEMBLIES
1. Attach point/track nozzle assembly RH (P/N 9508-4000) and point/track nozzle
assembly LH (P/N 9508-4001) to the openings in the tie duct. Position
assemblies for proper airflow direction.
2. Assemble the individual track duct sections into two complete track duct sections.
The mid and heel sections contain splices wrapped around the outside of the duct.
Unhook the clips to remove the three cover pieces. The bottom can now be
removed from the duct.
To assemble the splice:
a. Center the bottom splice piece on the seam between the two track
ducts.
b. Connect the center cover piece over the seam. (NOTE: The center
cover piece has slots to contain the bolts on the track duct).
c. Finally, connect the two end cover pieces.
4. Lay the track ducts on the rail ties alongside where they will be installed.
5. Refer to the drawing 92774. Place the track duct support brackets in position on
the ties so that one is near the heel end and one near each joint. Use the lag bolts
to fasten the brackets in place. Lay the track duct on the bracket bases. Place the
hold-down straps over the track ducts. Attach the hold-down strap to the track
duct support brackets by inserting the spring clip into the strap.
6. Push in the square knockouts in the track ducts where airflow is desired. The
knockout should be pushed in and bent completely so that no portion of the
knockout obstructs the airflow in the duct. Knockout tabs that are not bent back

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completely will obstruct the airflow as it moves through the track duct resulting in
reduced air pressure and airflow further along the track duct.
D. GAS CONNECTION
CAUTION
1. The following items are shipped in a carton marked "GAS LINE
ACCESSORIES", along with various pipe fittings, so that they may be arranged
to fit the particular installation. Refer to Instruction Sheet R9500-0027 included
with Gas Line Accessories for the proper placement of these components.
Flexible pipe
Y strainer (s)
Manual shutoff valve
Low pressure regulator
Regulator Spring, if included.
2. The following items are available as optional items
* High pressure regulator (P/N 45103)
* 36" Gas tank "pigtail" (P/N 60127)
* 12" Gas tank "pigtail" (P/N 45038)
* Remote gas valve (P/N 45036)
NOTE: A propane package is available (P/N 9458-0100) that includes a 36" tank
pigtail, high pressure regulator, gas line strainer, gauge, remote solenoid
valve in a pole mount enclosure, and a 4X4X8’ post.
FOR NATURAL GAS INSTALLATION PROCEED TO STEP 5
3. *Install the copper "pigtail" to the propane tank. Each end of the pigtail is a
reverse thread.
4. *Install the high pressure (red) regulator to the pigtail. Remember reverse thread
on the pigtail connection.
5. Install the "Y" strainer downstream (but near) the high pressure regulator, or
natural gas source.
6. *Install the remote gas valve downstream (but near) the "Y" strainer. Electrical
connections from the remote gas valve are made to terminal posts TS1-10
When tightening gas line fittings or components to the HAB
unit be sure that you do not rotate the pipe that enters the
blower unit. This could cause the gas control valve inside the
blower unit to rotate also. Please reference the label attached
just above the pipe that enters the blower unit.

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(115vac) and NEUTRAL on the HAB unit. The valve must be mounted with the
inlet and outlet horizontal, and the coil upwards.
7. Install adequate size gas pipe from the remote tank location to the main HAB unit.
Check with local gas supplier for sizing recommendations.
8. The remaining gas line components are attached to the HAB unit, as shown on the
drawing, layout, GHAB Gas Line. Remember to position the regulator vent
fitting facing sideways so that moisture will not enter the regulator.
9. If you are having problems adjusting the gas pressure low enough on two HP
units, the spring in the low pressure regulator must be changed. To change the
spring, complete the following steps:
a. Try adjusting the low pressure regulator for proper fuel
pressure. If it can’t be adjusted, follow instructions listed
below for changing the regulator spring.
b. Turn power off and close manual gas valve.
c. Remove the plug on top of the regulator.
d. Turn the plug inside the regulator counter-clockwise
until it can be removed.
e. Replace the red spring with the violet spring provided in
the gas accessory kit.
f. Replace the top plug.
g. Go to gas pressure menu to adjust.
h. Turn the manual gas valve to “ON” position and turn
power on.
i. Place the AUTO/OFF/LOCAL switch (SS1) in the
“LOCAL” position.
j. Place the burner control select in the hi-only position.
k. After the 30-second pre-purge period, the unit will
ignite. Check the gas pressure display. Adjust the white
plug in regulator until the display reads 11” water
column for propane or 7” water column for natural gas.
NOTE: Clockwise to increase pressure, counter-
clockwise to decrease pressure.
l. Let the GHAB run for a 10 minute period.
m. After the 10 minute period, take temperature readings at

P/N R9550-0100 19 © 2018 RAILWAY EQUIPMENT CO.
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both point nozzles.
n. Determine the ambient temperature at the location and
subtract the ambient temperature from the point nozzle
reading. This temperature should not exceed 250˚F for
optimum efficiency.
o. If the temperature is above 250˚F, adjust the gas
pressure at the low pressure regulator down (1” w.c. at
a time) until you reach the desired temperature.
p. Replace the top plug.
* OPTIONAL ITEMS AVAILABLE FROM RAILWAY EQUIPMENT CO.

P/N R9550-0100 20 © 2018 RAILWAY EQUIPMENT CO.
REV I
11/18
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