Maintenance; Routine Maintenance And Inspection - Modine Manufacturing MRL Series Installation And Service Manual

6.0

Maintenance

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Routine Maintenance and Inspection

6.0 Maintenance
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 Maintenance and 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
ensure 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.
• Clearances 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 the 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: 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.
• Heat Exchangers: Check the integrity of the heat exchangers. Replace if there are signs of structural
failure. Check for corrosion and/or buildup within the tube exchanger passageways.
• Burner: Check for proper ignition, burner flame, and flame sense. Flame should extend directly
outward from burner without floating or lifting.
• Wiring: Check electrical connections for tightness and/or corrosion. Check wires for damage.
• 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.
WARNING
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MRL Series