Energy Tech Laboratories DHG240 POST-START Check List GAS, Manifold GAS Pressure Adjustment

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035-17233-000-C-0702

5.Set room thermostat to desired temperature.(If thermo- stat set temperature is above room temperature, pilot burner ignition will occur and, after an interval to prove pilot flame, main burners will ignite).

TO SHUT DOWN:

1.Turn off electric power to unit.

2.Depress knob of gas valve while turning to off position.

POST-START CHECK LIST (GAS)

After the entire control circuit has been energized and the heating section is operating, make the following checks:

1.Check for gas leaks in the unit piping as well as the sup- ply piping.

2.Check for correct manifold gas pressures. See Checking Gas Input.

3.Check the supply gas pressure. It must be within the lim- its shown on rating nameplate. Supply pressure should be checked with all gas appliances in the building at full fire. At no time should the standby gas line pressure exceed 13", nor the operating pressure drop below 5.0" for natural gas units. If gas pressure is outside these lim- its, contact the local gas utility for corrective action.

MANIFOLD GAS PRESSURE ADJUSTMENT

Small adjustments to the high-fire gas flow may be made by turning the pressure regulator adjusting screw on the auto- matic gas valve. Refer to Figure 16.

On-Off Control

High Fire Adj.

(Under Screw)

Pilot Adj.

(Under Screw)

FIGURE 16 : TYPICAL GAS VALVE

Adjust as follows:

1.Remove the cap on the regulator. It's located next to the push-on electrical terminals.

2.To decrease the gas pressure, turn the adjusting screw counterclockwise.

3.To increase the gas pressure, turn the adjusting screw clockwise.

NOTE: The correct manifold pressure for these furnaces is 3.5 IWG 0.3.

PILOT CHECKOUT

The pilot flame should envelope the end of the flame sensor. Refer to Figure 16. To adjust pilot flame, (1) remove pilot adjustment cover screw, (2) increase or decrease the clear- ance for air to the desired level, (3) be sure to replace cover screw after adjustment to prevent possible gas leakage.

Put the system into operation and observe through complete cycle to be sure all controls function properly.

BURNERASSEMBLYBRACKET

FLAMESENSORBULB

1/8"GAPBETWEENCARRY-OVER TUBE ANDFLAMESENSORBULB

CARRY-OVERTUBE

FIGURE 17 : PROPER FLAME ADJUSTMENT

BURNER INSTRUCTIONS

To check or change burners, pilot or orifices, CLOSE MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALL ELEC- TRIC POWER TO THE UNIT.

1.Remove the screws holding either end of the manifold to the burner supports.

2.Open the union fitting in the gas supply line just upstream of the unit gas valve and downstream from the main manual shut-off valve.

3.Remove the gas piping closure panel.

4.Disconnect wiring to the gas valves and spark ignitors. Remove the manifold-burner gas valve assembly by lift- ing up and pulling back.

Burners are now accessible for service.

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Unitary Products

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Contents Installation Instruction Table of Contents General Safety Considerations Product NomenclatureAgency Approvals InstallationInspection 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-OFFEnthalpy SET Point Adjustment Power EXHAUST/BAROMETRIC Relief Damper and Rain Hood OptionVent and Combustion AIR Hoods 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 DriveDHG 20 TON Supply AIR Blower Performance Volt and High Speed Drive AccessoryDHG240 Bottom Duct CONNECTIONS1 Static RESISTANCES1 Power Exhaust PerformanceBlower Motor and Drive Data 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 BlowerNormal Maintenance MaintenanceCleaning Flue Passages and Heating ELE- Ments Troubleshooting Typical Flue Baffle INSTALLA- Tion035-17233-000-C-0702 Unitary

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