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12.

A qualified service agency must check for proper
operating gas pressure upon installation of the
heater.

13.

Light according to instructions on heater or within
owner's manual.

14. It is extremely important to use the proper size and

type of gas supply line to assure proper functioning of
the heater.  Contact your fuel gas supplier for proper
line sizing and installation.

15. This heater can be configured for use with either L.P.

gas vapor withdrawal or natural gas.  Consult the
dataplate, located on interior of the burner end or
motor end door, for the gas configuration of the
specific heater.  Do not use the heater in an L.P. gas
liquid withdrawal system or application.  If you are in
doubt, contact the L.B. White Co., Inc.

16. Eventually, like all electrical/mechanical devices, the

thermostat can fail.  Thermostat failure may result in
either an underheating or overheating condition
which may damage critical products and/or cause

animal injury or death.  Critical products and/or
animals should be protected by a separate back-up
control system that limits high and low temperatures
and also activates appropriate alarms.

17. Take time to understand how to operate and maintain

the heater by using this Owner’s Manual.  Make sure
you know how to shut off the gas supply to the
building and also to the individual heater.  Contact
your fuel gas supplier if you have any questions.

18. Any defects found in performing any of the service or

maintenance procedures must be eliminated and
defective parts replaced immediately.  The heater
must be retested by properly qualified ser vice
personnel before placing the heater back into use.

19.

Do not exceed input rating stamped on the dataplate
of the heater.  Do not exceed the burner manifold
pressure stated on the dataplate.  Do not use an
orifice size different than specified for the specific
input rating of this heater, fuel type configuration and
altitude.

1.

Optional air diverters can be installed in the heater
outlet to provide direction to the heated air as it exits
the heater.  Installation options include installing the
diverters in such a way as to broadly distribute the air
in two 45 degree paths or to focus the air flow in one
45 degree direction.  See Fig. 2.

2.

The air diverters may require hand forming prior to
installation.  Make 90 degree bends utilizing the
performations provided.  Diverter should then have
the shape shown in Fig. 2.

3.

The air diverter’s tabs on each half will pop into the
b l owe r   o u t l e t   b e t we e n   t h e   i n s i d e   o f   t h e   c a s e
assembly and the blower housing outlet.  If the
notched tabs do not pop into the blower outlet,
loosen (do not remove) the blower outlet screws.
Doing this provides a gap into which you can insert
the tabs.  Retighten the screws after installation.  

FIG. 2 

(Typical installation allowing two directions of air movement.)

(Accessory)

AIR DIVERTER 

INSTALLATION INSTRUCTIONS

Alternate Air Diverter Installations

TABS

DIVERTER 
HALVES

OUTLET
SCREWS

FORMED 
OUTLET GUARD

NOTCHES IN MOUNTING TABS

9

Summary of Contents for GUARDIAN Smart Sense AD250

Page 1: ...ding Heaters with Smart Sense Automatic Variable Rate Heat For Use with SmartBox Controller ATTENTION ALL USERS This heater has been designed tested and evaluated by L B White Co Inc as a direct gas f...

Page 2: ...line solvents paint thinner dust particles or unknown chemicals Failure to follow these instructions may result in a fire or explosion Fire or explosions can lead to property damage personal injury or...

Page 3: ...B White distributor dealer or the L B White Company Contact your local L B White distributor or the L B White Co Inc for assistance or if you have any questions about the use of the equipment or its...

Page 4: ...ed to Support Combustion CFM Burner Manifold Pressure in W C Net Weight lbs Shipping Weight lbs Electrical Supply Volts Hz Phase Amp Draw Starting Amps Includes Igniter Dimensions Inches L x W x H Min...

Page 5: ...environment controller is required for further operation See Fig 1 for a typical system diagram Each SmartBox controls two zones of heat two heaters er zone One sensor may be used for each zone of he...

Page 6: ...ht the appliance for you WARNING Do not use this heater for heating human living quarters Do not use in unventilated areas The flow of combustion and ventilation air must not be obstructed Proper vent...

Page 7: ...ving switch Never operate this heater with any safety device that has been bypassed Do not operate this heater unless all of these features are fully functioning 6 Do not operate the heater with its d...

Page 8: ...eep foreign materials from entering the gas valve and protect the safe functioning of that important safety component 10 Any heater connected to a piping system must have an accessible approved manual...

Page 9: ...fects found in performing any of the service or maintenance procedures must be eliminated and defective parts replaced immediately The heater must be retested by properly qualified service personnel b...

Page 10: ...TIONS SEDIMENT TRAP ASSEMBLY NIPPLE HOSE ADAPTER TEE NIPPLE CAP TO GAS CONTROL VALVE INLET EYEBOLT NUT FLATWASHER CAGE NUT CHAIN CASETOP NOTE REGULATORS SHOULD ALWAYS BE MOUNTED OUTDOORS IF CIRCUMSTAN...

Page 11: ...suitable for use with L P gas or natural gas on the threaded connections 2 Assemble the components together according to the figure This view is to show general assembly of the components only The reg...

Page 12: ...1 and 2 FIG 7 B Wiring from SmartBox to the heater s Smart Sense variable rate gas control valve a Connect Smart Sense gas control valve wiring for Zones 1 and 2 at SmartBox leads as shown in Fig 8 F...

Page 13: ...onnel shall service or repair the heater 5 On a call for heat 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 ign...

Page 14: ...ee of dust c When washing with water observe and obey the Warning within these Cleaning Instructions This same Warning is also supplied on the heater 14 Cleaning Instructions Maintenance Instructions...

Page 15: ...and must be replaced Do not operate the heater with the switch jumpered Replace the part immediately An alternate method for checking the components is to perform a continuity check 5 Do not jumper t...

Page 16: ...off briskly rub the sensor rod with emery cloth or steel wool to remove any build up Restart the heater Ensure the igniter gap is 1 8 3 16 in and the igniter tip is positioned over the burner port ac...

Page 17: ...bout a minute before firmly pressing the reset button on the switch 6 Check for electrical continuity across the switch terminals to make sure the contacts have closed 7 Reinstall the switch back into...

Page 18: ...2 Do the readings at the inlet and outlet pressure gauges agree with that specified on the dataplate If so then no further checking or adjustment is required Proceed to section D 3 If the inlet press...

Page 19: ...s is essential as it will relate directly to problem solving provided by the flow charts The ignition control module is self diagnostic The red light on the module will flash a specific pattern depend...

Page 20: ...control terminal PS2 Ignition control powers the igniter and igniter sparks Ignition control sends 24 volts from terminal MV to gas control through high limit switch Ignition occurs Igniter continues...

Page 21: ...ive Replace ignition module Is proper voltage supplied to transformer Check electrical connections and power supply to transformer Repair as necessary No Yes 21 Heater does not cycle above minimum hea...

Page 22: ...seconds off repetitively for 15 minutes Heater has attempted three ignition trials Heater is in a 15 minute wait period before attempting three more trials for ignition If ignition is not achieved aft...

Page 23: ...efective motor or capacitor Replace motor Yes Remove obstruction Clean as necessary No Is fan wheel plugged with dirt No Is there an obstruction in blower outlet preventing air proving switch closure...

Page 24: ...o heater and check with a gauge No Remove orifice and burner casting Blow out with compressed air or clean with a soft brush No No No No No Is flame sensor insulator cracked No Is flame sensor properl...

Page 25: ...blems in three time flash pattern 1 The ignition control sends and receives voltages throughout the entire operation sequence The ignition control s terminals should also be checked for delivering pro...

Page 26: ...ROUND POWER CORD WHITE FAN MOTOR GAS CONTROLVALVE L1 IND L E D MV PS2 PS1 W FS R X C COM GREEN YELLOW BLACK DSI CONTROL TRANSFORMER IGNITER FLAME SENSOR HIGH LIMIT SWITCH AIR PROVING SWITCH BLACK BLAC...

Page 27: ...ical circuit to the gas control valve in event of overheat situation Ignition Control Module Controls the ignition sequence and operation of the heater as well as monitoring the safety sevices A major...

Page 28: ...28 Parts Identification PARTS SCHEMATIC 29 27 14 15 16 17 19 18 20 21 22 23 24 25 26 13 12 11 10 9 8 28 7 6 5 4 3 2 1...

Page 29: ...Orifice burner Propane Gas 570053 Natural Gas 572876 10 Burner 570655 11 Burner mounting hardware 570211 12 Igniter and sensor assembly 22473 13 High limit switch 505566 14 Heat chamber 570200 15 Case...

Page 30: ...urchase 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 b...

Page 31: ......

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