MAINTENANCE
If the actual input is not within 5% of the furnace rating (with allowance being made for the permissible range of the regulator setting), replace the orifice spuds with spuds of the proper size.
NOTE To find the Btu input, multiply the number of cubic feet of gas consumed per hour by the Btu content of the gas in your particular locality (contact your gas company for this information - it varies widely from city to city.)
GAS HEATING UNITS
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 to give a distinct, sharp blue flame as explained under “BURNER AIR SHUTTER ADJUSTMENT”. If it is not possible to adjust for the proper flame, the burners may need cleaning.
NORMAL MAINTENANCE
CAUTION: Prior to any of the following maintenance proce- dures, shut off all electric 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. The dimensional size of the replacement filter must be the same as the replaced filter.
MOTORS
Outdoor fan motors are permanently lubricated and require no maintenance.
Ventor motor is factory lubricated for an estimated 10 year life.
Indoor Blower Motor and Drive - The indoor blower motor features ball bearings that do not require periodic lubrication. Periodic lubrication of the motor and bearings can extend the life of components but is optional.
CAUTION: Damage can occur if the bearings are overlubri- cated. Use grease sparingly.
WARNING: Perform all maintenance operations on the blower motor with electric power disconnected from the unit. Do not attempt to lubricate bearings with the unit in operation.
On an annual basis, check the motor for accumulations of dust, etc. that may block the cooling slots in the motor shell. Check for loose, damaged or misaligned drive components. Check that all mounting bolts are tight. Replace defective parts as required.
If desired, every three years remove both pipe plugs at each end shell and clean out any hardened grease or foreign matter. Replace one plug on each end with a clean grease fitting. Using a low pressure grease gun, pump grease (Chevron
Units are supplied with blower shaft bearings that do not require maintenance but may be relubricated if desired. Every three years, using a low pressure grease gun, pump grease into the bearing grease fitting until grease just begins to show at the seals. Do not over lubricate. Use any lithium base grease recommended for ball bearing service.
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 electric 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 hot condenser air discharge to be obstructed by overhanging structures of shrubs.
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.
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 plate from the top draft blower housing and the top draft blower wheel.
4.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. Then remove the center divider plate separating the upper and lower flue boxes.
5.On the inside of the flue collector box, remove the flue baffles from the tube interiors. Note the last bend of the baffle fits tightly against the tube forcing the end of the baffle to lock into the tube collar. This collar is formed when the tube is expanded into the end sheet. To remove, move the end of the baffle toward the center of the tube releasing the end of the baffle from the tube collar, then pull straight out of the tube.
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 hoods from the flue collector end.
9.If soot
FIG. 19 - TYPICAL FLUE BAFFLE INSTALLATION
20 | Unitary Products Group |
