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1.

Have your gas supplier check all gas piping annually
for leaks or restrictions in gas lines.  Also, at this time
have your gas supplier clean out the sediment trap on
the zone control panel of any debris that may have
accumulated.

2.

The heater’s surrounding area shall be kept clear
and free from combustible materials, gasoline, and
other flammable vapors and liquids.

3.

Regulators can wear out and function improperly.
Have your gas supplier check the date codes on all
regulators installed and check delivery pressures to
the appliance to make sure that the regulator is
suitable for continued use.

4.

Regulators must be periodically inspected to make
sure the regulator vents are not blocked.  Debris,
insects, insect nests, snow, or ice on a regulator can
block vents and cause excess pressure at the
appliance.

5.

For safety as well as for optimum performance at the
heater, it is necessary to keep the outside of the
heater free of dust, dirt or any combustible material.
If any operational component shows signs of rust or
corrosion, replace the component immediately.  

6.

If any warning or instruction labels, dataplates, etc.
b e c o m e   l o s t   o r   h a rd   to   r e a d ,   r e p l a c e   t h e m
immediately.  Do not operate the heater until you
have all instructions and can read and understand
them.

7.

Check overall condition of heater for cracked or
damaged components, loose screws or bolts,nicked
or cut electrical leads, etc.  Replace any suspect
components.

8.

Check all hose and tubing assemblies for cracks,
abrasions or ruptures.  Replace any hoses that are
suspect.

9.

Ensure relfector supports and 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 suspect.

11.

At least once a year, check the air inlet assembly.
Ensure the air inlet assembly and its duct are free of
blockages.

Maintenance Instructions

Service Instructions

1.

Close the fuel supply valve to the heater and
disconnect the heater’s electrical supply before
servicing unless it is necessary to have the valve
open and electrical supply connected for your service
procedure.

2. O p e n   t h e   b u r n e r   b ox   fo r   a c c e s s   to   c o n t ro l

components.  Close and latch after servicing.

3. For reassembly, reverse the respective ser vice

procedure.  Ensure gas connections are tightened
securely.

4. Clean the heater’s burner orifice and pressure switch

orifices with compressed air or a soft, dry rag.  Do not
use files, drills, broaches, etc. to clean the orifice
hole.  Doing so will enlarge the hole, causing ignition
or combustion problems.  Replace the orifice if it
cannot be cleaned properly.

5. Disconnect appropriate component electrical leads

when servicing.

5. After servicing, light the heater to ensure proper

operation and check for gas leaks.

WARNING

Fire and Explosion Hazard

Do not disassemble or attempt to repair any heater
components or gas train components.

All component parts must be replaced if defects are
found.

Failure to follow this warning will result in fire or
explosions, causing property damage, injury, or death.

WARNING

Burn Hazard

Heater surfaces are hot for a period of time after the
heater has been shut down.

Allow the heater to cool before performing service,
maintenance, or cleaning.

Failure to follow this warning will result in burns
causing injury.

GENERAL

17

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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