Detroit Radiant Products Company LD3 Series - Manual (Page 56)

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LD3 Series 5.0 Maintenance • Routine Inspection
WARNING
!
Personal injury or death may result if maintenance is not performed by properly trained
gas installer or service personnel. Contact the installing distributor or place of purchase
for service.
Do not operate heating system if repairs are necessary.
Allow heater to cool prior to servicing.
Disconnect power to heater before servicing.
Use protective glasses when maintaining the heater.
Routine Inspection:
At least once per year, the heating system should be inspected and serviced by trained gas installation
and service personnel only. This inspection should be performed at the beginning of the heating season
to insure that all heater components are in proper working order and that the heating system operates
at peak performance. Particular attention should be paid to the following items.
• Clearance to Combustibles: Inspect the area near the unit to be sure there is no combustible
material located within the minimum clearance requirements listed in this manual. Under no
circumstances should combustible material be located within the clearances specified in this manual.
Failure to provide proper clearance could result in personal injury or equipment damage from fire.
• Gas Connection: Inspect the integrity of the gas connection to the heater. Check for leaks, damage,
fatigue or corrosion. Do not operate if repairs are necessary and turn off gas supply to the heater.
Contact service personnel.
To check gas tightness of the safety shut-off valves, turn off the manual valve upstream of the appliance
combination control. Remove the hex head plug on the inlet side of the combination control and connect a
manometer to that tapping.
Turn the manual valve on to apply pressure to the combination control. Note the pressure reading on the
manometer, then turn the valve off. Any loss of pressure indicates a leak. If leak is detected, use a soap
solution to check all threaded connection. If no leak is found, combination control is faulty and must be
replaced before putting appliance back in service.
• Blower Motor: Annual oiling of the blower motor with SAE oil will extend bearing life significantly.
Motors with sealed ball bearings (no oil ports) do not require oiling. Ensure that the squirrel cage in
the blower is kept clean. If dirt becomes a problem, installation of outside air intake ducts for
combustion is recommended.
Check lubrication instructions on motor. If oiling is required, add three or four drop of SAE 20 electric
motor oil.
• After three years or 25,000 hours (for light-duty operation).
• Annually after three years or 8,000 hours (for medium-duty operation).
• Annually after one year or 1,500 hours (for heavy-duty operation).
Never over-oil the motor, or premature failure may occur.
NOTICE