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Propane gas and natural gas has man-made odorant added specifically for detection of fuel gas leaks.
If a gas leak occurs, you should be able to smell the fuel gas.  
THAT’S  YOUR  SIGNAL  TO  GO  INTO  IMMEDIATE  ACTION!

Do not take any action that could ignite the fuel gas.  Do
not operate any electrical switches.  Do not pull any
power supply or extension cords.  Do not light matches
o r   a ny   ot h e r   s o u rc e   o f   f l a m e .     D o   n ot   u s e   yo u r
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 at the meter if you
use natural gas.

Propane 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.  

Natural gas is lighter than air and can collect around
rafters or ceilings.

Use your neighbor’s phone and call your fuel gas
supplier and your fire department.  Do not re-enter the
building or area.

Stay out of the building and away from the area until
declared safe by the firefighters and your fuel gas
supplier.

FINALLY, 

let the fuel gas ser vice person and the

firefighters check for escaped gas.  Have them air out
the building and area before you return.  Properly
trained service people must repair the leak, check for
further leakages, and then relight the heater for you.

Some people cannot smell well.  Some people cannot
smell the odor of the man-made chemical added to
propane or natural gas.  You must determine if you
can smell the odorant in this fuel gas.  

Learn to recognize the odor of propane gas or natural
gas.  Local propane 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 confinement buildings can mask fuel gas odor.

The odorant in propane 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 filter the odorant.  

Propane gas odor may differ in intensity at different
levels.  Since propane 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.

FUEL GAS ODOR

ODOR FADING -- NO ODOR DETECTED

ATTENTION -- CRITICAL POINTS TO REMEMBER!

Propane gas and natural gas has a distinctive odor.
Learn to recognize this odors.  (Reference “Fuel Gas
Odor” and “Odor Fading” sections above.

If you have not been properly trained in repair and service
of propane gas and natural gas fueled heaters, then do
not attempt to light the heater, perform service or repairs,
or make any adjustments to the heater on a propane gas
or fuel system.

Even if you are not properly trained in the service and
repair of radiant heaters, ALWAYS be consciously aware
of the odors of propane gas and natural gas.

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.  DO NOT WAIT!

6

WARNING

Do not use this radiant heater for heating human living
quarters.

Do not use in unventilated areas.

The flow of combustion and ventilation air must not be
obstructed.

Proper ventilation must be provided to support the
combustion air requirements of the heater being used.

Refer to the specification section of the Owner’s
M a n u a l ,   h e a te r ’ s   d a t a p l a te ,   o r   c o n t a c t   t h e  

L.B. White Company to determine combustion air
ventilation requirements of the heater.

Lack of proper ventilation air will lead to carbon
monoxide poisoning in humans leading to serious
injur y or death.  Symptoms of carbon monoxide
poisoning can include headaches, dizziness and
difficulty in breathing.

Symptoms of improper ventilation affecting livestock
can be disease, lower feed conversion, or death.

Asphyxiation Hazard

Safety Precautions

Summary of Contents for Sentinel AT 100

Page 1: ...ments you may have call us toll free at 800 345 7200 ATTENTION ALL USERS This heater has been tested and evaluated by C S A International in accordance with the requirements of standard ANSI Z83 20 20...

Page 2: ...charge For assistance contact L B White at 800 345 7200 FOR YOUR SAFETY If you smell gas 1 Open windows 2 Don t touch electrical switches 3 Extinguish any open flame 4 Immediately call your gas suppl...

Page 3: ...f the heater or its application The L B White Co Inc has a policy of continuous product improvement It reserves the right to change specifications and design without notice SECTION PAGE General Inform...

Page 4: ...ation Air Required to Support Combustion Minimum Safe Distances of Heater From Nearest Combustible Materials See Fig 1 on page 5 Amp Draw Starting Amps Include Igniter Motor Characteristics 1 02 Tempe...

Page 5: ...LINE WATER LINES FEED LINE INSTALL SENSOR APPROX 15 FT DOWN FROM BURNER BOX SENSOR LITTER 12 18 FIG 2 TEMPERATURE SENSOR LOCATION OR IN PROXIMITY INSIDE WATER LINE SENSOR TO AN IN FEED LINE SENSOR LOC...

Page 6: ...l 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 filter the odorant Propane gas odor may diff...

Page 7: ...r soft brush or dry cloth to clean the interior of the heater and it s components After external washdown do not operate this heater until it is completely dry In any event do not operate the heater f...

Page 8: ...ng Inlet Air From Attic Use L B White air inlet kit 24950 Drawing Inlet Air Through Side Walls 4 The heater is approved for indoor use only 12 IN MIN FROM INSIDE OF ROOF 12 IN MIN ABOVE INSULATION ROO...

Page 9: ...cannot be stopped Ensure all gas leaks have been identified and repaired before proceeding 12 Install a sediment trap at the gas valve inlet to prevent foreign materials pipe compound pipe chips and s...

Page 10: ...hown in Fig 1 3 From the burner box chain measure the distances shown in Fig 6 Aligning to the center of the burner box discharge hang chains at these points using open eye hooks FIG 5 FIG 6 INITIAL S...

Page 11: ...Clamp bolts must be tight Tighten both bolts firmly Tighten both bolts to 35 ft lbs Finish tightening bolts to 65 ft lbs 3 Slide on hangers and connect to chains 4 Connect and hang remaining tubes F F...

Page 12: ...cap is up against burner box 3 Slide remaining reflectors over tubes Overlap the reflectors 2 3 inches Non notched ends overlap notched ends 4 Attach remaining end cap to last reflector with U clips 5...

Page 13: ...must always be mounted so its vent regardless of location on the regulator is always pointed downward Ensure hose is positioned away from the heater 2 Tighten all connections securely and check for g...

Page 14: ...iring of thermostat as shown or refer to electrical diagram on heater 3 Building Controller Connections See Fig 15 Remove wire nut from yellow and orange wires Connect controller contacts as shown B H...

Page 15: ...for heat the red status LED will come on The motor will start up and run for five 5 seconds This pre purge is a safety feature and a normal operational characteristic prior to ignition taking place A...

Page 16: ...el is closed and securely latched Water spray nozzle shall not discharge within 6 feet of the burner box and its tubes The water pressure does not exceed 45 PSIG for 10 seconds on each side of burner...

Page 17: ...d hangers are secure reflectors do not sag and are properly located 10 Check all gasketing on burner box and fan housing discharge Ensure all is in good condition Replace any gasket material if suspec...

Page 18: ...8 in See Fig 22 2 Clean the electrode and ground rod using emery cloth FIG 22 IGNITER 1 8 IN GAS CONTROL VALVE 1 Brush or blow off any dust in area of the gas control valve 2 Disconnect the gas hose...

Page 19: ...ssary FIG 25 5 When reinstalling the burner ensure larger opening between burner vanes is directed to the access door of the burner box See Fig 26 FIG 26 BURNER ORIFICE MOTOR AND FAN ASSEMBLY 19 NUTS...

Page 20: ...sure switch See Fig 32 Remove respective orifice from switch Hold up to light if blocked clean the orifice Ensure orifices are securely pushed backed into proper location on switch FIG 31 Servicing th...

Page 21: ...l 5 Remove the plug from the connector near the power cord and route the gauge tubing through the connector See Fig 33 Keep the connector s plug FIG 33 6 If connector is occupied by thermostat wiring...

Page 22: ...e has opened to second stage and the gas pressure will increase Verify second stage gas pressure according to dataplate If different the HI heat regulator must be adjusted Turn clockwise or counterclo...

Page 23: ...nostic light is flashing A One Time 25 B Two Times 25 C Three Times 26 D Four Times 26 E Five Times 26 Components should be replaced only after each step has been completed and replacement is suggeste...

Page 24: ...y Check circuit breakers in building electrical system Check power cord for continuity Replace thermostat Are 24 volts supplied from transformer Replace transformer No No No No Yes Are 24 volts suppli...

Page 25: ...r voltage Check electrical supply circuit breakers etc Is proper voltage supplied to heater Yes No Red LED Flashing One Time Differential air pessure switch contacts are closed before fan motor starts...

Page 26: ...ad connected No No Connect high voltage lead Yes A Check high voltage lead for continuity and tight connections Replace if defective B Defective improperly gapped or dirty igniter Replace regap or cle...

Page 27: ...Electrical Connection and Ladder Diagram SINGLE STAGE THERMOSTAT GAS CONTROL 27...

Page 28: ...HI LO TWO STAGE THERMOSTAT GAS CONTROL 28...

Page 29: ...o modulate from a first stage minimum heat position to a second stage maximum heat position if needed to satisfy the temperature requirements of the building This results in less temperature variation...

Page 30: ...Parts Identification PARTS SCHEMATIC 30 24 35 34 22 36 37 33 32 30 27 23 26 25 50 41 45 29 28 31 49 43 44 38 51 52 14 48 40 42 39 18 15 8 10 5 4 13 11 12 3 6 9 16 20 19 2 46 7 21 1 47 50 50 33 31 5...

Page 31: ...t 19 Spacer 19A Fitting Pressure 19B Copper Pressure Tube with fittings 20 Burner Orifice LP NG 21 Manifold 22 Gas Control Valve Single Stage LP NG Two Stage LP NG 23 Motor 24 Fan Housing 25 Fan Wheel...

Page 32: ...rchase by the end user Warranty is automatic if a component is found defective within 12 months of the date code marked on the part If the defect occurs more than 12 months later than the date code bu...

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