Desa TC250RNG User Manual
NATURAL GAS
CONSTRUCTION
HEATER
OWNER’S MANUAL
Model: TC250RNG
IMPORTANT: Read and understand this manual before assembling, starting, or servicing heater.
Improper use of heater can cause serious injury. Keep this manual for future reference.
GENERAL HAZARD 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 FIRE, 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.
IF YOU NEED ASSISTANCE OR HEATER INFORMATION SUCH AS AN INSTRUCTIONS MANUAL,
LABELS, ETC. CONTACT THE MANUFACTURER.
MODEL TC250RNG
NATURAL GAS CONSTRUCTION HEATER
SAFETY
INFORMATION
WARNINGS
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: NOT FOR HOME
OR RECREATIONAL VEHICLE
USE.
The heater is designed for use as a construction heater. Certain standards govern the
use of fuel gases and heating products for
specific uses. Your local authority can advise you about these. The primary purpose
of construction heaters is to provide temporary heating of buildings under construction, alteration or repair. Properly used, the
heater provides safe economical heating.
Products of combustion are vented into the
area being heated.
We cannot foresee every use which may be
made of our heaters. Check with your local
fire safety authority if you have questions
about heater use.
Carbon Monoxide Poisoning: Some
people are more affected by carbon monoxide than others. Early signs of carbon monoxide poisoning resemble the flu, with headaches, dizziness, and/or nausea. If you have
these signs, the heater may not be working
properly. Get fresh air at once! Check for
proper ventilation and have heater serviced.
Natural Gas: Natural gas has a distinctive
odor. This odor helps you detect a natural
gas leak. However, the odor may fade. Natural gas may be present even though no odor
exists.
Make certain you read and understand all
Warnings. Keep this manual for reference.
It is your guide to safe and proper operation
of this heater.
• Install and use heater with care. Follow
all local ordinances and codes. In the
absence of local ordinances and codes,
refer to the National Fuel Gas Code
Handbook, NFPA54/ANSI Z223.1 and
the Natural Gas Installation Code, CAN/
CGA B149.2. This instructs on the safe
storage and handling of flammable gases.
• Use only with natural gas. Do not attempt
to use with LP gas.
• Provide adequate ventilation. Before using heater, provide at least a three-squarefoot opening of fresh, outside air for each
100,000 Btu/Hr of rating. This heater
produces carbon monoxide, which is
listed by the State of California as a reproductive toxin under Proposition 65.
• For indoor use only. Do not use heater
outdoors.
• Do not use heater in occupied dwellings
or in living or sleeping quarters.
• Do not use heater below ground level.
• Keep appliance area clear and free from
combustible materials, gasoline, paint
thinner, and other flammable v apors and
liquids. Do not use heater in areas with
high dust content.
• Minimum heater clearances from combustible materials:
Sides: 6 Ft. Top: 5 Ft.
• Check heater for damage before each use.
Do not use a damaged heater.
• Check hose (if used) before each use of
heater. If highly worn or cut, replace before using heater.
• Locate heater on stable and level surface
if heater is hot or operating.
• Not intended for use on finished floors.
• Never block air inlet (bottom of shell) or
air outlet (top of shell) of heater.
• Keep heater away from strong drafts,
water spray, rain, or dripping water.
• Keep children and animals away from
heater.
• Do not leave heater unattended.
• Never move, handle, or service a hot or
operating heater. Severe burns may result. You must wait 20 minutes after turning heater off.
• T o prevent injury , wear glov es when handling heater.
• Never attach duct work to heater.
• Do not alter heater. Keep heater in its
original state.
• Do not use heater if altered.
• Turn off natural gas supply to heater
when not in use.
• Use only original replacement parts. This
heater must use design-specific parts. Do
not substitute or use generic parts. Improper replacement parts could cause
serious or fatal injuries.
UNPACKING
1. Remove all packing items applied to
heater for shipment. Keep plastic cover
caps (attached to valve inlet) for storage.
2. Remove all items from carton.
3. Check all items for shipping damage.
If heater is damaged, promptly inform
dealer where you bought heater.
Note:
A gas hose is not included. User
must supply hose or flexible connector.
THEORY OF
OPERATION
The Fuel System: The gas supply at-
taches to the heater by a minimum 3/8 inch
i.d. hose or flexible connector. User must
supply hose or flexible connector. The length
should be no more than 10 feet long. The
natural gas moves through the regulator (if
used) and through the control valve, then
out the nozzle.
The Ignition System: The piezo ignitor
lights the burner fuel supply.
The Automatic Control System: The
automatic control valve shuts off the heater
if the flame goes out.
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104133
OWNER’S MANUAL
PRODUCT
IDENTIFICATION
Emitter
Nozzle
Main Burner
Tube
Base Shell
Main Burner
Valve Handle
Top
Shell
Ignitor Electrode
Pilot Burner
Thermocouple
Piezo Ignitor Button
Regulator/Fuel
Tube Assembly
Installed
NATURAL GAS
SUPPLY
The user must furnish the natural gas supply
and the connections to the heater.
Regulate the natural gas supply down to
4 psi. If over 4 psi is supplied, then use the
supplied regulator on the heater. The natural
gas supply capacity should be able to supply
a minimum of 250 cubic feet of gas at
pressure for each heater connected to the
system.
Consult your natural gas supplier for proper
sizing of the natural gas supply lines.
Follow all local ordinances and codes. In
the absence of local ordinances and codes,
refer to the National Fuel Gas Code Hand-
book, NFPA54/ANSI Z223.1 and the Natural gas Installation Code, CAN/CGA B149.2.
VENTILATION
WARNING: Provide at least a
7.5 square foot opening of fresh,
outside air while running heater.
If proper fresh, outside air ventilation is not provided, carbon
monoxide poisoning can occur.
Provide proper fresh, outside air
ventilation before running heater.
Fresh Outside Air Opening
Requirements
Heater Size - 250,000 BTU/Hr
Square Feet Opening - 7.5
Automatic Control
Valve Button
Figure 1 - Product Identification
104133
Valve Inlet
SPECIFICATIONS
Rating(BTU/Hr) 250,000
Base
3
Fuel Natural Gas Only
Fuel Consumption 243 cubic ft/hr
Supply Pressure
Maximum (To regulator) 200 psi
Minimum (To heater) 4 psi
Maximum To Heater
Without Regulator 4 psi
Manifold Pressure 3.5 psi
Weight (Pounds) 33
Shipping Weight (Pounds) 40
Size - 46L x 16W x 16H (Inches)
MODEL TC250RNG
NATURAL GAS CONSTRUCTION HEATER
INSTALLATION
WARNING: Review and understand the warnings in the
Safety Information Section, page
2. They are needed to safely operate this heater. Follow all local
codes when using this heater.
WARNING: Test all gas piping and connections for leaks
after installation or servicing.
Never use an open flame to check
for a leak. Apply a mixture of
liquid soap and water to all joints.
Bubbles forming show a leak.
Correct all leaks at once.
1. Provide natural gas supply system.
2. Install plumbing from natural gas supply system to heater. Pro vide 4 psi gas
pressure to heater. If gas supply pressure is over 4 psi, use high pressure
regulator (provided).
3. Connect gas supply to heater using
minimum 3/8" i.d. hose. Maximum
hose length is 10 feet.
4. Connect hose or plumbing to 1/2" SAE
flare fitting at the valve inlet. Tighten
all fittings with a wrench.
5. Open natural gas supply valve slowly.
Check all connections for leaks. Never
use an open flame to check for a leak.
Apply mixture of liquid soap and water to gas joints. Bubbles forming show
a leak that must be corrected. Correct
all leaks at once.
6. Close natural gas supply valve.
Installing High Pressure
Regulator
If the inlet supply pressure is above 4 psi,
you must use the high pressure regulator
(supplied). Follow the instructions below to
install regulator.
1. Install pipe or flexible connector (not
supplied) from gas supply to high pressure regulator . Pipe or flexible connector must be a minimum of 3/8" i.d. with
a maximum lenth of 10 feet. Attach pipe
or flexible connector to inlet of regulator. The female threads of the regulator
are 1/2 npt.
ply must deliver 250 CFH of natural
Note:
The natural gas sup-
gas at 4 psi pressure for each heater
connected to the system.
2. Mount regulator to heater base below
piezo ignitor button (see Figure 2). Use
1/4-20 screws from hardware bag to attach regulator to heater . Mount regulator so the outlet with male connector
points toward the heater inlet .
3. Attach the 1/2" copper fuel tube (supplied) to male connector on regulator.
Attach other end of fuel tube to heater
inlet. Firmly tighten fuel tube flare nuts
onto each fitting.
4. Open natural gas supply valve slowly.
Check all connections for leaks. Never
use an open flame to check for a leak.
Apply mixture of liquid soap and water to gas joints. Bubbles forming show
a leak that must be corrected. Correct
all leaks at once.
5. Close natural gas supply valve.
6. Follow steps under To Start Heater in
the OPERATION section (page 5) of
this manual.
Regulator
Screws
Copper Fuel Tube
Figure 2 - Installing Regulator
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