DeWalt DXH125FAV User manual

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INSTRUCTION MANUAL
GUIDE DE’UTILISATION
MANUAL DE INSTRUCCIONES
INSTRUCTIVO DE OPERACION, CENTROS DE SERVICIO Y POLIZA
DE GARANTIA, ADVERTENCIA: LEASE ESTE INSTRUCTIVO ANTES
DE USAR EL PRODUCTO.
Forced Air Propane Construction Heater DXH125FAV, DXH150FAV
Forced Air Propane Chauffe-Construction DXH125FAV, DXH150FAV
Propano forzado calentador Construcción Aire DXH125FAV, DXH150FAV 3/13 40794 Rev13A
READ INSTRUCTIONS CAREFULLY: Read
and follow all instructions. Place instructions
in a safe place for future reference. Do
not allow anyone who has not read these
instructions to assemble, adjust or operate
the heater.
VEUILLEZ LIRE ATTENTIVEMENT LES INSTRUCTIONS :
Lisez et observez toutes les instructions. Conservez
ces instructions dans un endroit sécuritaire pour vous
y référer ultérieurement. Interdisez à quiconque n’ayant
pas lu les présentes directives d’assembler, de régler ou
de faire fonctionner cette fournaise.
LEA CUIDADOSAMENTE LAS INSTRUCCIONES:
Lea y siga todas las instrucciones. Conserve
estas instrucciones en un lugar seguro para futura
referencia. No permita que nadie que no haya
leído estas instrucciones arme, ajuste o use el
calentador.

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WARNING:
Combustion byproducts produced when using this product
contains carbon monoxide, a chemical known to the State of
California to cause cancer and birth defects (or other reproductive
harm).
This product contains chemicals known to the State of California to
cause cancer and birth defects or other reproductive harm.
WARNING: DO NOT OPERATE THIS HEATER UNTIL YOU READ
AND UNDERSTAND THIS INSTRUCTION MANUAL FOR SAFETY,
OPERATION, AND MAINTENANCE INSTUCTIONS. PLACE
INSTRUCTIONS IN A SAFE PLACE FOR FUTURE REFERENCE.
WARNING:
Failure to comply with the precautions and instructions provided with this
heater, can result in death, serious bodily injury and property loss or damage
from hazards of re, explosion, burn, asphyxiation, carbon monoxide
poisoning, and/or electrical shock.
Only persons who can understand and follow the instructions should use or
service this heater.
DANGER:
CARBON MONOXIDE CAN KILL YOU
This heater produces carbon monoxide. Do not use in occupied spaces.
Ventilate building, room or other enclosed spaces where heater has been
used before entering. Never use in a vehicle, camper or tent.
WARNING:
Not for home or recreational vehicle use. Do not use to cook or warm food.
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.
WARNING: IF THE INFORMATION IN THIS MANUAL IS
NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY
RESULT CAUSING PROPERTY DAMAGE, PERSONAL
INJURY OR LOSS OF LIFE.
• Do not use gasoline or other ammable vapors or liquids in the
vicinity of this or any other applicance.
• An LP cylinder not connected for use shall not be stored in the
vicinity of this or any other appliance.
• WHAT TO DO IF YOU SMELL GAS:
• Do not try to light appliance.
• Extinguish any open ame.
• Shut off gas to appliance.
• Service must be performed by a qualied service agency.
WARNING: RISK OF ELECTRICAL SHOCK
• Plug power cord into a properly grounded 3-wire receptacle.
• Do not operate in wet or damp conditions.
Definitions: Safety Guidelines
The denitions below describe the level of severity for each signal word. Please read the manual and pay attention to these symbols.
DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
NOTICE: Indicates a practice not related to personal injury which, if not avoided, may result in property damage.

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Specifications
CONTENTS
WARNINGS ........................................................................ 2-3
HEATER SPECIFICATIONS ................................................... 3
OPERATING PRECAUTIONS ................................................ 4
SAFETY PRECAUTIONS ....................................................... 4
ODOR FADE WARNING ..................................................... 5-6
OPERATING INSTRUCTIONS ............................................... 6
MAINTENANCE, STORAGE AND SERVICE ......................... 7
WIRING DIAGRAMS.............................................................. 8
PARTS LISTS/EXPLODED VIEWS.................................... 9-12
WARRANTY......................................................................... 13
INSTRUCTIONS FOR ORDERING PARTS .......................... 13
WARNING: RISK OF FIRE OR EXPLOSION
• Do not store or use gasoline or other ammable vapors and liquids in
the vicinity of this or any other appliance.
• WHAT TO DO IF YOU SMELL GAS:
• Open windows.
• DO NOT try to light any appliance.
• DO NOT operate any electrical switches.
• DO NOT use any telephone in building. Immediately call the
local gas supplier from an outside telephone. Follow the gas
supplier’s instructions.
• DO NOT touch any electrical switch; do not use any phone in your
building.
• If you cannot reach your gas supplier, call the Fire Department.
Model: DXH125FAV DXH150FAV
Rating: 75,000 - 125,000 Btu/Hr 110,000 - 150,000 Btu/Hr
(21.9 – 36.6 kW) (32.2 – 43.9 kW)
Fuel Consumption: 3.5 – 5.8 #/hr 5.1 – 6.9 #/hr
(1.59 – 2.63 kg/hr) (2.31 – 3.13 kg/hr)
Fuel Orifice Size 1.26 mm 1.40 mm
SPECIFICATIONS
Type of Gas: ..............For use with Propane Only
Gas Supply Pressure
to regulator .............Max.: Bottle Pressure
to regulator .............Min.: 5 psig (34.5 kPa)
regulator out ..........27.5" W.C. (6.84 kPa)
Electrical Input:..........115V, 60 Hz, 1Ø, 3a
Min. Operating Voltage: 100V
Ignition:......................Direct Spark
Primary
Flame Control: .........Thermocouple Operated Gas Valve
High Temperature
Control:....................240°F (116°C)
Min. Ambient Temp. Rating 0°F (-17.8°C)

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7. IMPORTANT Use only the hose and regulator assembly provided with the
heater. Match the color stripe on the hangtag attached to the hose assembly
with the color on the label located near the propane inlet fitting on the heater.
Inspect hose assembly before each use of the heater. If there is excessive
abrasion or wear, or hose is cut, replace with hose assembly listed on parts list
before using heater.
8. For indoor use only. Area must be well ventilated. Figure 1. (also see “Operating
Precautions”).
9. If at any time gas odor is detected, IMMEDIATELY DISCONTINUE operation
until the source of gas has been located and corrected. Read Odor Fade and
Propane information on page 5, for additional information about detecting
propane leaks.
10. Install the heater such that is is not directly exposed to water spray, rain and/or
dripping water.
11. Maintain minimum clearance from normal combustible material (like paper).
Figure 2.
12. Due to the high surface and exhaust temperatures, adults and children must
observe clearances to avoid burns or clothing ignition.
13. Operate only on a stable, level surface.
14. Do not use with duct work. Do not restrict inlet or exit.
15. Use only the electrical power specified. The electrical connection and grounding
must comply with National Electrical Code - ANSI/NFPA 70 (USA) and CSA
C22.1 Canadian Electrical Code, Part 1 (Canada).
16. Use only a properly grounded 3-prong receptacle or extension cord.
17. Do not move, handle or service while hot or burning.
18. Use only in accordance with local codes or, in the absence of local codes, with
the Standard for the Storage and Handling of Liquefied Petroleum Gases ANSI/
NFPA 58 and CSA B149.1, Natural Gas and Propane Installation Code.
Safety Precautions
1. Check the heater thoroughly for damage. DO NOT operate a damaged heater.
2. DO NOT modify the heater or operate a heater which has been modified from
its original condition.
3. Use only propane gas.
4. Use only VAPOR WITHDRAWAL propane supply. If there is any question about
vapor withdrawal, ask your propane dealer.
5. Mount the propane cylinders vertically (shutoff valve up). Secure them from
falling or being knocked over and protect them from damage.
6. Locate propane containers at least (USA) 7 ft. (2.13m), (Canada) 10 ft. (3m) from
the heater and do not direct exhaust toward containers.
Operating Precautions
This is a propane, direct-fired, forced air heater. It’s intended use is primarily
temporary heating of buildings under construction, alteration or repair.
Direct-Fired means that all of the combustion products enter the heated space.
Even though this heater operates very close to 100 percent combustion
efficiency, it still produces small amounts of carbon monoxide. Carbon
monoxide (called CO) is toxic. CO can build up in a heated space and failure to
provide adequate ventilation could result in death. The symptoms of inadequate
ventilation are:
• headache • dizziness
• burning eyes and nose • nausea
• dry mouth or sore throat
Be sure to follow advice about ventilation in the Safety Precautions section.
Forced Air means that a blower or fan pushes the air through the heater. Proper
combustion depends upon this air flow; therefore, the heater must not be
revised, modified or operated with parts removed or missing. Likewise, safety
systems must not be circumvented or modified in order to operate the heater.
When the heater is to be operated in the presence of other people the user is
responsible for properly acquainting those present with the safety precautions
and instructions, and of the hazards involved.
WARNING
WARNING

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Figure 2
MINIMUM CLEARANCE: From normal combustible material
Clearance DXH125FAV DXH150FAV
From floor..................................0 ft.........................0 ft.
From outlet ................................8 ft.........................8 ft.
From sides ................................3 ft.........................3 ft.
From top....................................6 ft.........................6 ft.
Locate 10 ft. from canvas or plastic tarpaulins or similar coverings
and secure them to prevent flapping or movement due to wind
action.
Figure 1
VENTILATION: Minimum openings required
Opening Opening
Heater near floor near ceiling
Forced air (
DXH125FAV, DXH150FAV )...........2 ft2....... ...........2 ft2
Fuel Gas Odor—Fuel Leaks
LP gas and natural gas have man-made odorants added specifically
for detection of fuel gas leaks. If a gas leak occurs you should be able
to smell the fuel gas. Since Propane (LP) is heavier than air you should
smell for the gas odor low to the floor. ANY GAS ODOR IS YOUR SIGNAL
TO TAKE IMMEDIATE ACTION!
WARNING
WARNING: RISK OF ASPHYXIATION
• Do not use in unventilated areas.
• The flow of combustion and ventilation air must not be obstructed.
• Proper ventilation air must be provided to support the combustion air
requirements of the heater being used.
• Refer to the specification section of the heater’s manual, heater dataplate,
or contact the factory to determine combustion air ventilation
requirements of the heater.
• Lack of proper ventilation air will lead to improper combustion.
• Improper combustion can lead to carbon monoxide poisoning leading to
serious injury or death. Symptom of carbon monoxide poisoning
can include headaches, dizziness and difficulty in breathing.
• Do not take any action that could ignite the fuel gas. Do not operate any
electrical switches. Do not plug in or disconnect any power supply or
extension cords. Do not light matches or any other source of ame. Do
not use your telephone.
• Get everyone out of the building and away from the area immediately.
• Close all propane (LP) gas tank or cylinder fuel supply valves, or the main
fuel supply valve located at the meter if you use natural gas.
• Propane (LP) gas is heavier than air and may settle in low areas. When
you have reason to suspect a propane leak, keep out of all low areas.
• Use your neighbor’s phone and call your fuel gas supplier and your re
department. Do not re-enter the building or area.
• Stay out of the building and away from the area until declared safe by the
reghters and your fuel gas supplier.
• FINALLY, let the fuel gas service person and the reghters check for
escaped gas. Have them air out the building and area before you return.
Properly trained service people must repair any leaks, check for further
leakages, and then relight the appliance for you.
Odor Fade Warning
Odor Fading—No Odor Detected
• Some people cannot smell the odor of the man-made chemical added
to propane (LP) or natural gas. You must determine if you can smell the
odorant in these fuel gases.
• Learn to recognize the odor of propane (LP) gas and natural gas. Local
propane (LP) gas dealers will be more than happy to give you a scratch and
sniff pamphlet. Use it to become familiar with the fuel gas odor.
• Smoking can decrease your ability to smell. Being around an odor for a
period of time can affect your sensitivity to that particular odor. Odors
present in animal connement buildings can mask fuel gas odor.

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• The odorant in propane (LP) gas and natural gas is colorless and the
intensity of its odor can fade under some circumstances.
• If there is an underground leak, the movement of gas through the soil
can lter out the odorant.
• Propane (LP) gas odor may differ in intensity at different levels. Since
Propane (LP) gas is heavier than air, there may be more odor at lower
levels.
• Always be sensitive to the slightest gas odor. If you continue to detect
any gas odor, no matter how small, treat it as a serious leak. Immediately
go into action as discussed previously.
• A periodic sniff test around the heater or at the heater’s joints; i.e. hose,
connections, etc., is a good safety practice under any conditions. If
you smell even a small amount of gas, CONTACT YOUR FUEL GAS
SUPPLIER IMMEDIATELY.
PREPARING FOR OPERATION
Operating Instructions
1. Check the heater for possible shipping damage. If any is found, immediately
notify the factory.
2. Follow all of the “Precautions”.
3. Connect the POL fitting of hose and regulator assembly to the propane
cylinder by rotating the POL nut counterclockwise into the propane cylinder’s
valve outlet and securely tighten with a wrench.
4. Connect the hose to the heater by rotating the hose fitting clockwise.
5. Securely tighten all gas connections.
6. Open the cylinder’s gas valve and check all gas connections with a soap
and water solution. DO NOT USE A FLAME.
7. Connect power cord to well-grounded 115V, 60 Hz,1Ø source of power.
8. When using an extension cord, make certain that it is a 3-wire (grounded)
cord of proper wire size.
1. Securely close valve on the propane cylinder.
2. Continue to operate heater until all fuel in the hose has burned.
3. Unplug the power cord.
START
1. Before heater ignition, always allow heater fan (blower) to run for 20 seconds
to purge fuel.
2. Slowly open the main valve at propane cylinder.
3. Depress the fuel valve button to light the heater.
4. After the heater lights, keep the gas valve button depressed for 15 seconds
then release and the heater will continue to operate.
5. Adjust burn rate by setting control knob to desired level.
6. Igniter continues to fire as long as power cord is plugged in.
7. No thermostat can be used with these units.
STOP
1. Securely close valve at propane cylinder. Unplug heater.
2. Wait 5 minutes.
3. Restart following “Start” procedure.
RESTART AFTER SAFETY SHUTDOWN

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1. The heater should be inspected before each use, and at least annually by a
qualified person.
2. Before each use, check the soft “O” ring seal at the bullnose of the POL
fitting. If the “O” ring is cut, scuffed, or otherwise damaged, replace it with
part number 73786.
3. Turn off the gas at the LP-gas supply cylinder(s) when the heater is not in
use.
4. When the heater is to be stored indoors, the connection between the
LP-gas supply cylinder(s) and the heater must be disconnected and
the cylinder(s) removed from the heater and stored out of doors and in
accordance with Chapter 5 of the standard for Storage and Handling of
Liquefied Petroleum Gases ANSI/NFPA 58 and CSA B149.1, Natural Gas and
Propane Installation Code.
MAINTENANCE AND STORAGE
Size and Capacity of Propane
Cylinders Required
The charts on the following page show the approximate size of the cylinder
required for these heaters. To use the chart:
1. Select the lowest air temperature expected (at the bottom of the chart).
2. Move straight up to time of operation desired (left side of chart).
3. Read the cylinder size required.
All heaters should have:
full cylinders
good air circulation
no frost on cylinders
A hazardous condition may result if a heater is used that has been modified or
is not functioning properly. When the heater is working properly:
• The flame is contained within the heater.
• The flame is essentially blue with perhaps some yellow tipping.
• There is no strong disagreeable odor, eye burning or other physical
discomfort.
• There is no smoke or soot internal or external to the heater.
• There are no unplanned or unexplained shut downs of the heater.
The parts lists and wiring diagram show the heater as it was constructed. Do
not use a heater which is different from that shown. In this regard, use only the
hose, regulator and cylinder connection fitting (called a POL fitting) supplied with
the heater. IMPORTANT Match the color stripe on the hangtag attached to the
hose assembly with the color on the label located near the propane inlet fitting
on the heater. Do not use alternates. For this heater, the regulator must be set as
shown in “specifications”. If there is any uncertainty about the regulator setting,
have it checked.
A heater which is not working right must be repaired, but only by a trained,
experienced service person.
In-warranty products will be repaired with no charge for either parts or labor.
Please include a brief statement indicating date, place of purchase, the nature of
the problem and proof of purchase.
Out-of-warrranty products will be repaired with a charge for parts and labor.
Servicing

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Wiring Diagrams DXH125FAV/DXH150FAV
125,000 BTU/HR (36.6 kW)
MAXIMUM OPERATING TIME - HOURS
AIR TEMPERATURE - oF (oC)
Use liquid
withdrawal
and a vaporizer
150,000 BTU/HR (43.9 kW)
NOTE: If any original wiring as supplied with the heater, must be replaced, It must be replaced with Type AWG
105° C wire or its equivalent, except as indicated (Type SF 2.200, **SGI-250° C)
40—
38—
36—
34—
32—
30—
28—
26—
24—
22—
20—
18—
16—
14—
12—
10—
8—
6—
4—
2—
0
3 cylinders
2 cylinders
1 cylinder
100# (45.4 kg)
60
(16)
40
(4.4)
20
(-6.7)
0
(-18)
-20
(-29)
100# (45.4 kg)
100# (45.4 kg)
MAXIMUM OPERATING TIME - HOURS
AIR TEMPERATURE - oF (oC)
Use liquid
withdrawal
and a vaporizer
40—
38—
36—
34—
32—
30—
28—
26—
24—
22—
20—
18—
16—
14—
12—
10—
8—
6—
4—
2—
0
3 cylinders
2 cylinders
1 cylinder
100# (45.4 kg)
60
(16)
40
(4.4)
20
(-6.7)
0
(-18)
-20
(-29)
100# (45.4 kg)
100# (45.4 kg)
HIGH LIMIT
SWITCH
MOTOR
THERMOCOUPLE
TO WIRE
IGNITION CONTROL
TEMP
MOTOR
VAC INPUT
HV TRANS
GND
SCREW
G
W
BLINE CORD
O**
G
SPARK PLUG
Y
B
Y
B
VAC INPUT
MOTOR
TEMP
HV TRANS
IGNITION
CONTROL
TO WIRE
TO WIRE
115V
60HZ
TO JUNCTION
SPARK
PLUG HIGH LIMIT
SWITCH
GND
SCREW
TEMP
MOTOR
VAC INPUT
MOTOR
B
W
COLOR CODE LEGEND
B BLACK
W WHITE
G GREEN
R RED
Y YEL
O ORG
FEMALE CONN.
RING CONN.
CONNECTION DIAGRAM SCHEMATIC DIAGRAM
Color Length From To
Yellow 18" (406mm) High Limit Ignition Control Temp. Terminal
Yellow 18" (406mm) High Limit Ignition Control Temp Terminal
WIRING CHART (Wire: Type AWG 150oC or equivalent (Type SF2-200, **SGI-250oC))

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Parts List DXH125FAV
R E F. # ..............ITEM#............ DESCRIPTION
1 ...................40896 ........... Guard, rear, assy
2 ...................40897............. Panel, guard, rear
3 ...................21652 ............ Motor, assy
4 ...................26086 ........... fan,blade
5 ...................40909 ........... Holder, flame
6 ...................26168 ............ High limit control, assy, 2
7 ...................40801 ............ Handle, DEWALT
8 ...................40904 ........... Electrode, ignition, DW, mesh
9 ...................26168 ............ High limit control, assy, 2
10 ...................40892 ........... Shield, radiation, assy
11 ...................40890 ........... Barrel, upper, assy
12 ...................40891 ............ Barrel, lower, assy
13 ...................26655 ........... Thermocouple
14 ...................40914 ............ Brkt, HLS,1
15 ...................27935 ............ High limit control, assy
R E F. # ..............ITEM#............ DESCRIPTION
16 ...................40901 ............ Tubing, gas, burner, assy
17 ...................23045 ........... bracket ignition/relay
18 ...................23276 ............ board, spark ignition
19 ...................40894 ........... Base, metal, assy
20 ...................40895 ........... base, metal, bottom, panel
21 ...................40879 ............ Knob, variable, valve
22 ...................40878 ............ Insert, plastic, controls
23 ...................40899 ........... Orifice
24 ...................40900 ........... Holder, orifice, assy
25 ...................40898 ........... Burner, mesh, assy
26 ...................40876 ............ Brkt, plastic, insert
27 ...................40902 ........... Valve, variable, assy
28 ...................40884 ........... Valve, gas, main
29 ...................40905 ........... Fitting, gas, inlet

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DXH125FAV