York 66441-YUM-D-1011 manual Cleaning Burners, Cleaning Flue Passages Heating Elements

66441-YUM-D-1011

CLEANING BURNERS

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

12.When replacing the center and top of the flue collector box, be careful not to tear the adjoining insulation.

13.Ensure that all seams on the vent side of the combustion system are air tight. Apply a high temperature (+500°F) sealing compound where needed.

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” of the unit installation instructions.

2.Remove the unit roof from over the gas heat section.

3.Remove the top plate and the top draft blower wheel from the upper draft blower housing.

4.Remove the screws holding the top of the flue collector box. Carefully remove the top of the flue collector box with- out 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 baf- fles 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. Refer to Figure 4.

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 col- lector end.

9.If soot build-up is particularly bad, remove the vent motor and clean the wheel and housings. Run the wire brush down the flue extensions at the outlet of the vent housings.

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 thru 5.

FIGURE 4 - TYPICAL FLUE BAFFLE INSTALLATION

AIR FILTERS

All units contain 2" filters. Filters can be installed in the build- ing at a suitable return air location if an economizer or outside air accessory is not used. Filters must always be used. They should be inspected once a month and thoroughly cleaned or replaced if it appears they are beginning to accumulate excessive dirt. Filter sizes and quantities are shown in the fol- lowing table.

	QUANTITY PER UNIT (Nom, Tons)
THROWAWAY
	15 TON	15, 20, 25		15 - 25
FILTER		TON REHEAT	25 TON	TON
	STD
SIZES		20 TON	STD	ULTRA
	& HIGH
(Inches)		STD & HIGH	EFF.	HIGH
	EFF.
		EFF.		EFF.
12 x 24	-	-	12	12
16x 20	-	4	-	-
16 x 25	-	4	-	-
18 x 24	5	-	-	-

To install the filters, remove the filter access panel located to the left of the condensate drain connection as shown in Fig- ure 5.

NOTE: Filters must be installed with “Air Flow” arrows point- ing inward -- toward the indoor coil. In the event the spacers in the filter section are removed, they must be reinstalled in their original position.

Slide filters all the way into the filter racks provided. When more than one filter in a filter rack is required, they must butt each other when sliding into position. Replace the filter access panel.

Johnson Controls Unitary Products 5