York 66386-YUM-C-1011 manual Explain Unit Function, General Maintenance, Heating System Inspection

66386-YUM-C-1011

EXPLAIN UNIT FUNCTION

When the system is functioning properly, show the owner the location of all disconnect switches and the thermostat. Explain how to start and stop the unit and how to adjust tem- perature settings within the limitations of the system. Advise that the flue exhaust hood surface and the immediate area will experience high temperatures during the heating cycle, and that all unauthorized personnel and debris must be kept away from this area.

GENERAL MAINTENANCE

In order to insure long and trouble free service from your sys- tem, we recommend periodic inspection, cleaning, lubrication and adjustment by your installing Dealer/Contractor. Be sure to ask about this service. For those who prefer to do-it-your- self, please follow the instructions listed below to care for your system.

Snow or debris should not be allowed to accumulate in or around the unit. Do not permit overhanging structures or shrubs to obstruct outdoor air discharge, combustion air inlets or vent outlets on your unit. These provide air for com- bustion and ventilation. Adequate air is important to the safe and proper operation of the unit.

HEATING SYSTEM INSPECTION

It is the owner's responsibility to insure that an annual inspec- tion of the entire heating portion of the unit is made by a qual- ified service technician. This should include inspection of the burner, heating element and flue for any corrosion or soot accumulation which may require cleaning and also checking of burner and controls for proper operation.

In addition, at least once during the heating season, the owner shall make a visual inspection of the flue outlet for evi- dence of black soot or blockage of flue outlet by leaves or other debris. If any soot is found, it is recommended a quali- fied service technician be called immediately. If any blockage is found, it must be cleared immediately.

Check for obvious signs of deterioration of the unit. Check that the return and supply ducts attached to the unit are sound and air tight. Check that the unit's physical support, concrete slab or roof curb, is sound and not in need of repair. Make sure there are no gaps between the roof curb and the unit where rain could leak into the building.

Start the furnace. The vent motor should start, the igniter will start to spark and ignite the burner. If it does not, contact a qualified service technician for assistance. Check the appear- ance of the main burner flame. The flame should have a blue appearance. (See Figure 3.)

HEATEXCHANGERTUBE

GAS
SUPPLY		BURNERFLAME
PIPE	BURNER
		(BLUEONLY)
BURNERBRACKET
	IGNITOR

FIGURE 3- TYPICAL FLAME

BURNER CHECK

Periodically (at least annually at the beginning of each heat- ing season) make a visual check of the main burner flame to determine if the burners need cleaning.

CLEANING BURNERS

Remove them from the furnace as explained the in BURNER/ ORIFICE INSTRUCTIONS section in the Unit Installation Instructions. Clean burners with wire brush and vacuum as needed.

CLEANING FLUE PASSAGES & HEATING ELEMENTS

With proper combustion adjustment, the heat exchanger tubes of a gas-fired furnace will seldom need cleaning. If the tubes should become sooted, they can be cleaned as follows:

1.Remove the burner assembly as outlined in “BURNER/ ORIFICES INSTRUCTIONS” of the unit Installation Instructions.

2.Remove the screws holding the flue collector box. Care- fully remove the flue collector box.

3.Remove the flue baffles from the tube interiors.

4.Using a wire brush on a flexible wand, brush out the inside of each heat exchanger from the burner inlet and flue outlet ends.

5.Brush out the inside of the flue collector box and the flue baffles.

6.Run the wire brush into the flue exhaust tube from the flue collector end. Do not damage the flue exhaust screen, remove if necessary.

7.If soot build-up is particularly bad, remove the draft motor and clean the wheel and housing.

8.After brushing is complete, blow away all brushed areas with air or nitrogen. Vacuum as needed.

9.Replace parts in the reverse order that they were removed in Steps 1 through 3.

10.Assure that all seams on the vent side of the combustion system are airtight. Apply a high temperature (500°F+) sealing compound where needed.

4 Johnson Controls Unitary Products