MAINTENANCE
NORMAL MAINTENANCE
CAUTION: Prior to any of the following maintenance proce- dures, shut off all power to the unit to prevent personal injury.
Periodic maintenance normally consists of changing or cleaning filters and (under some conditions) cleaning the main burners.
FILTERS - Inspect once a month. Replace disposable or clean permanent type as necessary. DO NOT replace permanent type with disposable.
MOTORS - Indoor fan and outdoor fan motors are permanently lubricated and require no maintenance. Ventor motor is factory lubricated for an estimated 10 year life.
OUTDOOR COIL - Dirt should not be allowed to accumulate on the outdoor coil surface or other parts in the air circuit. Cleaning should be as often as necessary to keep coil clean. Use a brush, vacuum cleaner attachment, or other suitable means. If water is used to clean coil, be sure power to the unit is shut off prior to cleaning.
NOTE: Exercise care when cleaning the coil so that the coil fins are not damaged.
Do not permit the outdoor air discharge to be ob- structed by overhanging structures of shrubs.
BURNER & PILOT - Periodically (at least annually at the beginning of each heating season) make a visual check of the pilot and main burner flame. If necessary, adjust main burner primary air shutters so that no yellow flame is observed as explained under “BURNER AIR SHUTTER ADJUSTMENT”. If it is not possible to adjust for the proper flame, the burners may need cleaning.
TO CLEAN BURNERS - Remove them from the furnace as explained in “Burner Instructions”. Clean burners with hot water applied along top of the burner.
COMBUSTION AIR DISCHARGE - Visually inspect discharge outlet periodically to make sure that the buildup of soot and dirt is not excessive. If necessary, clean to maintain adequate combustion air discharge.
The manufacture recommends that the furnace system be inspected once a year by a qualified service person.
CLEANING FLUE PASSAGES AND HEATING ELEMENTS
With proper combustion adjustment the heating element of a gas fired furnace will seldom need cleaning. If the element should become sooted, it can be cleaned as follows:
1.Remove the burner assembly as outlined in “BURNER INSTRUCTIONS”.
2.Remove the roof over the gas heat section.
3.At the top front of the heat section, remove the screws holding the top of the flue collector box. Carefully remove the top of the flue collector box without ripping the adjacent insulation.
4.Lift out the flue diverter baffle.
5.On the inside of the flue collector box, remove the screws holding the flue baffle. Remove the flue baffle.
6.Using a wire brush on a flexible wand, brush out the inside of each heat exchanger from the burner inlet and flue outlet ends.
7.Brush out the inside of the flue collector box and the flue baffles.
8.Run the wire brush down the vent tube from the flue collector end.
9.If soot
10.After brushing is complete, blow all brushed areas with air or nitrogen. Vacuum as needed.
11.Replace parts in the order they were removed in Steps 1 to 5.
12.When replacing the top of the flue collector box, be careful so as not to tear the adjoining insulation.
13.Assure that all seams on the vent side of the combustion system are air tight. Apply a high temperature (+500°F) sealing compound where needed.
TROUBLESHOOTING
WARNING: Troubleshooting of components necessarily re- quires opening the electrical control box with the power connected to the unit. Use extreme care when working with live circuits! Check the unit nameplate for the correct line voltage and set the volt meter to the correct range before making any connections with line terminals.
CAUTION: The wire number or color and terminal designations referred to may vary. Check the wiring label inside the control box access panel for the correct wiring.
1.Draft motor operates and furnace lights but supply air blower does not start after a short time delay with room thermostat fan switch set to “AUTO”.
a.Set fan switch to “ON”. If blower motor runs, go to Step f. If it does not, check to see if line voltage is being supplied to the contacts of the blower relay, “BR”, and if the blower relay is pulled in. Check for loose wiring.
b.If “BR” is pulled in, touch the supply air blower motor housing. If it is hot the motor may be off on inherent protection. Disconnect power to the unit and check the blower motor capacitor. If it is defective, replace it with one of equal capacitance and voltage.
c.If “BR” is pulled in and the blower motor still does not run, replace the blower motor.
d.If “BR” is not pulled in check for 24 volts at the “BR” coil. If 24 volts is present, replace the “BR” relay.
e.If 24 volts is not present at the “BR” coil, check for loose 24 volt wiring back to the relay board. Check control wiring to the room thermostat. If all is fine, replace the relay board.
f.If the blower motor runs with the fan switch in the “ON” position but does not run soon after the furnace has ignited with the fan switch in the “AUTO” position, check for loose 24 volt wiring between the relay board in the main control box.
g.If all control wiring is fine, check for 24 volts at the relay board. If 24 volts is present, replace the relay board. If 24 volts is not present, replace the “BT” or "ETD".
NOTE: The furnace may shut itself down on a high tempera- ture condition during the procedure but this will not effect the test if it is done within 5 minutes of furnace
Unitary Products Group | 19 |
