Energy Tech Laboratories DHG180, DHG240 Burner AIR Shutter Adjustment, Checking Supply AIR CFM

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1

Loosennut(A)(topandbottom).

035-17233-000-C-0702

3

Neverloosennuts(C)fromeachother.

heat exchanger.

2Adjustthe

byturningbolt(B).

 

4.Usebelttensioncheckertoapplyaperpendicularforcetoonebeltatthe

 

 

midpointofthespanasshown.Thedeflectionforceshouldbeapplied

Reverse the above procedure to replace the assemblies.

 

untilspecificdeflectiondistanceof4mm(5/32")isobtained.Todetermine

Procedureforadjustingbelttension:

 

 

thedeflection

fromnormalposition,useastraightedgefrom

Make sure that burners are level and seat at the rear of the

 

sheavetosheavedistanceasreferenceline.Therecommendeddeflectionforce

BURNER AIR SHUTTER ADJUSTMENT

 

isasfollows:

DEFLFORCE

Adjust burner shutters so no yellow flame is observed in the

 

heat exchanger tubes. Refer to Figure 17.

 

 

CHECKING SUPPLY AIR CFM

 

 

The RPM of the supply air blower will depend on the required CFM, the unit accessories or options and the static resis- tances of both the supply and the return air duct systems. With this information, the RPM for the supply air blower and the motor pulley adjustment (turns open) can be determined from the blower performance data in Tables 11 and 12.

High speed drive accessories (containing a smaller blower pulley and a shorter belt) are available for applications requir- ing the supply air blower to produce higher CFM's and/or higher static pressures. Use Model 1LD0416 for 15 ton units and Model 1LD0417 for 20 ton units. Refer to Table 15 for

blower motor and drive data.

Tnsionnewbelts

*Never(B)Loosen

the(A)max.deflectionforce(C)*rcommendedforthebelt

s

.Checkthebelttensionatleasttwotimsduringthefirst24hoursof

operati

.Anyreatnsioningshouldfallbetwenthee

min.andmax.

deflectionforcevalues.

 

5.Afteradjusting,retightennuts(A).

 

FIGURE 19 : BELT ADJUSTMENT

FIGURE 18 : TYPICAL FLAME APPEARANCE

Note the following:

1.The supply air CFM must be within the limitations shown in Table 2.

2.Pulleys can be adjusted in half turn increments.

3.The tension on the belt should be adjusted as shown in Figure 19.

Start the supply air blower motor. Adjust the resistances in both the supply and the return air duct systems to balance the air distribution throughout the conditioned space. The job specifications may require that this balancing be done by someone other than the equipment installer.

To check the supply air CFM after the initial balancing has been completed:

1.Remove the two 5/16" dot plugs from the blower motor and the filter access panels shown in Figure 10.

2.Insert at least 8" of 1/4 inch tubing into each of these holes for sufficient penetration into the air flow on both sides of the indoor coil.

NOTE: The tubes must be inserted and held in a position per- pendicular to the air flow so that velocity pressure will not affect the static pressure readings.

3.Using an inclined manometer, determine the pressure drop across a dry evaporator coil. Since the moisture on an evaporator coil may vary greatly, measuring the pres- sure drop across a wet coil under field conditions would be inaccurate. To assure a dry coil, the compressors should be deactivated while the test is being run.

4.Knowing the pressure drop across a dry coil, the actual CFM through the unit and clean 2" filters, can be deter- mined from the curve in Figure 20.

After readings have been obtained, remove the tubes and

reinstall the two 5/16" dot plugs that were removed in Step 1.

Failure to properly adjust the total system air quan- tity can result in extensive blower damage.

NOTE:De-energize the compressors before taking any test measurements to assure a dry indoor coil.

Unitary Products

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Contents Installation Instruction Table of Contents Product Nomenclature General Safety ConsiderationsInspection InstallationAgency Approvals Rigging and Handling LocationFixed Outdoor AIR Intake Damper DuctworkCompressors Service AccessPower and Control Wiring Condensate DrainGAS Connection Control Wire SIZES1Combustion Discharge GAS PipingControlwiring External Supply Connection External SHUT-OFF Pipe SIZING1Vent and Combustion AIR Hoods Power EXHAUST/BAROMETRIC Relief Damper and Rain Hood OptionEnthalpy SET Point Adjustment Enthalpy Setpoint Adjustment DHG Electrical Data Physical DataDHG Voltage LIMITATIONS1 Minimum ClearancesUnit Dimensions DHG180 & 240 Front View Utilities Entry Unit Dimensions DHE/DHG180 & 240 Rear ViewVolt and Standard Drive 230/460 Volt and High Speed Drive AccessoryDHG 15 TON Supply AIR Blower Performance DHG180 Bottom Duct CONNECTIONS1DHG240 Bottom Duct CONNECTIONS1 Volt and High Speed Drive AccessoryDHG 20 TON Supply AIR Blower Performance Blower Motor and Drive Data Power Exhaust PerformanceStatic RESISTANCES1 Preliminary Operation Cooling Safety ControlsOperation Cooling SystemIntermittent Blower Heating SystemStart UP To Shut Down Manifold GAS Pressure AdjustmentPOST-START Check List GAS Pilot CheckoutChecking Supply AIR CFM Burner AIR Shutter AdjustmentBelt Drive Blower Checking GAS InputGAS Rate Cubic Feet PER HOUR1 Secure OWNER’S ApprovalCleaning Flue Passages and Heating ELE- Ments MaintenanceNormal Maintenance Typical Flue Baffle INSTALLA- Tion Troubleshooting035-17233-000-C-0702 Unitary

DHG180, DHG240 specifications

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