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PARTS LIST

31

AT125

24737

24859
24587
24586
24589
26804
26805
24592
22299
08255
08347
22301
26806
81218

26137
26140

08257

40’                50’

572339             572340

572338

09242
24924
26836
26837

572348
572345

26810

22076

22078

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24963
24964
24598
26809

24947

24590
24962
24848

07715

24849
09104

25745

24867
24868
24591

25746

09199

20713

05548

07148

06553
00815
24864
24858
24856

24975
24857
24861

26129

AT150

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50’

572337
572338

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572349
572346

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Item

Description

1

Air Turbulation Strip

2

Vent Hood

3

Tube, Uncoated, 4 in. x 10 ft.

4

Tube, Aluminized, 4 in. x 10 ft.

5

Clamp

6

Cover, Burner Box, w/Hinges & LEDs       Single Stage

Two Stage

7

Amber LED

8

Red  LED

9

Window, Plug

10

O-Ring

11

Ignition Control

12

Igniter w / Bracket

13

Transformer

14

Harness,Wire

15

Ignition Cable

16

Hinge

17

Burner Assembly

LP
NG

18

Nut

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

26

Switch, Differential Air Pressure w/ Orifice

27

Tube, Pressure Switch

29

Ceramic Gasket

30

Tube, Swaged, 8 in. w/ Flange

31

Chain

32

Open Eye Bolt

33

S-Hook

34

Open Eye Lag Screw

35

Hanger

36

End Cap, Reflector

37

U-Clip

38

Reflector

39

Support, Reflector

40

Latch

41

Hose, w / Adapter, Rigid x Swivel

42

Shut off Valve

43

Nipple 1/2 x 3 in.

44

Regulator, Second Stage, LP Gas

45

Sediment Trap

46

Bracket, Gas Control Valve

47

Flex Tube, 4 in. Dia. x 8 ft.

48

Tube, Air Inlet

49

Coupling / Flange Assembly

50

Clamp, Flex Tube

51

Air Inlet End Cap

52

Power Cord

NOTE:

Gasket for fan housing discharge is Part # 24850
Complete gasket kit for burner box is Part # 26746
Complete motor and fan assembly is Part # 24961

AT100

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30’                40’

572343             572341

572344             572342

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572347

570053

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572350

572351

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572352
572353

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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