Series AA250
Page 18
LT252 Oct 2019
MAINTENANCE INSTRUCTIONS
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 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
reliable.
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. Review all heater markings (i.e. warnings, start-up/shutdown, electrical wiring, diagrams, etc.) for legibility.
Ensure that none are cut, torn, or otherwise damaged.
6. Inspect gas hoses for nicks, cuts, or corroded fittings. Replace the complete gas hose assembly if defects
are found.
7. Inspect the heater’s electrical connections. Replace any terminals that are corroded.
CLEANING INSTRUCTIONS
1. Before cleaning, close fuel supply valve to heater and disconnect electrical supply.
2. The heater should have dirt or dust removed periodically:
a. After each flock or between building re-population, give the heater a general cleaning using
compressed air or a soft brush on its interior and exterior. At this time, dust off the motor case to
prevent the motor from over-heating and shutting the heater down.
b. At least once a year, give the heater a thorough cleaning. At this time, remove the fan and motor
assembly and brush or blow off the fan wheel, giving attention to the individual fan blades. Additionally,
make sure the burner air inlet venturi ports and the throat of the casting are free of dust accumulation
and the area between the heat chamber top and inside case is also free of dust.
c. When washing with water, observe all warnings supplied on the heater.
SERVICE INSTRUCTIONS
1. Close the fuel supply valve to the heater and disconnect the electrical supply before servicing unless
necessary for your service procedure.
2. Clean the heater’s orifice 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 combustion or ignition problems. Replace the
orifice if it cannot be cleaned properly.
3. If the heater is not lighting, one possible cause is a defective high limit switch. It can be tested by:
o
Disconnecting the leads at the component, and jumping the leads together.
o
Reconnect the electrical supply and open fuel supply valves
o
If the heater lights, the component is defective and must be replaced.
o
Do not leave jumper on or operate the heater if the part is defective. Replace the part immediately.
o
An alternative method for checking the components is to perform a continuity check.
4. Test the air proving switch for continuity. If defective, replace the switch.
5. Open the respective case panel for access to burner or fan related components. Open the control box for
access to the ignition controller, and transformer.
6. Disconnect the appropriate electrical leads when replacing components.
7. For reassembly, reverse the respective service procedure. Ensure gas connections are tightened securely.
8. After servicing, start the heater to ensure proper operation and check for gas leaks.
