035-17233-000-C-0702

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 col- lar, then pull straight out of the tube. Refer to Figure 20.

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 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 hous- ings.

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 through 4.

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.

FIGURE 21 : TYPICAL FLUE BAFFLE INSTALLA- TION

TROUBLESHOOTING

Label all wires prior to disconnection when servic- ing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.

Troubleshooting of components necessarily requires 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.

Prior to any of the following maintenance proce- dures, shut off all electric power to the unit to pre- vent personal injury.

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.)

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Unitary Products

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Energy Tech Laboratories DHG240, DHG180 installation instructions Troubleshooting, Typical Flue Baffle INSTALLA- Tion
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DHG180, DHG240 specifications

Energy Tech Laboratories has made significant strides in the realm of energy efficiency and renewable technologies with the introduction of their innovative models, the DHG240 and DHG180. These advanced devices are designed to optimize energy consumption, minimize environmental impact, and enhance overall energy management.

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