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

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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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Contents Installation Instruction Table of Contents General Safety Considerations Product NomenclatureInspection InstallationAgency Approvals Location Rigging and HandlingDuctwork Fixed Outdoor AIR Intake DamperCondensate Drain Service AccessPower and Control Wiring CompressorsGAS Piping Control Wire SIZES1Combustion Discharge GAS ConnectionControlwiring Pipe SIZING1 External Supply Connection External SHUT-OFFVent and Combustion AIR Hoods Power EXHAUST/BAROMETRIC Relief Damper and Rain Hood OptionEnthalpy SET Point Adjustment Enthalpy Setpoint Adjustment Minimum Clearances Physical DataDHG Voltage LIMITATIONS1 DHG Electrical DataUnit Dimensions DHG180 & 240 Front View Unit Dimensions DHE/DHG180 & 240 Rear View Utilities EntryDHG180 Bottom Duct CONNECTIONS1 230/460 Volt and High Speed Drive AccessoryDHG 15 TON Supply AIR Blower Performance Volt and Standard DriveDHG240 Bottom Duct CONNECTIONS1 Volt and High Speed Drive AccessoryDHG 20 TON Supply AIR Blower Performance Blower Motor and Drive Data Power Exhaust PerformanceStatic RESISTANCES1 Cooling System Safety ControlsOperation Preliminary Operation CoolingHeating System Intermittent BlowerStart UP Pilot Checkout Manifold GAS Pressure AdjustmentPOST-START Check List GAS To Shut DownBurner AIR Shutter Adjustment Checking Supply AIR CFMSecure OWNER’S Approval Checking GAS InputGAS Rate Cubic Feet PER HOUR1 Belt Drive BlowerCleaning Flue Passages and Heating ELE- Ments MaintenanceNormal Maintenance Troubleshooting Typical Flue Baffle INSTALLA- Tion035-17233-000-C-0702 Unitary

DHG180, DHG240 specifications

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