Trane WC-IOM-7 manual Pre-Start, Verifying Proper Air Flow Units with Belt Drive Indoor Fan

Page 36

Pre-Start

Verifying Proper Air Flow

(Units with Belt Drive Indoor Fan)

Much of the systems performance and reliability is closely associated with, and dependent upon having the proper airflow supplied both to the space that is being conditioned and across the evaporator coil.

The indoor fan speed is changed by opening or closing the adjustable motor sheave.

Before starting the SERVICE TEST, set the minimum position setpoint for the economizer to 0 percent using the setpoint potentiometer located on the Economizer Control (ECA), if applicable.

ReliaTel Control

Using the Service Test Guide in Table 5, momentarily jump across the Test 1 &

Test 2 terminals on LTB1 one time to start the Minimum Ventilation Test.

Once the supply fan has started, check for proper rotation. The direction of rotation is indicated by an arrow on the fan housing.

With the fan operating properly, determine the total system airflow (CFM) by;

1.Measuring the actual RPM,

2.Measure the amperage at the supply fan contactor and compare it with the full load amp (FLA) rating stamped on the motor nameplate.

a. Calculate the theoretical BHP

Actual Motor Amps X Motor HP

Motor Nameplate Amps

b.Using the fan performance tables in the unit Service Facts, plot the actual RPM (step 1) and the BHP (step 2a) to obtain the operating CFM.

3.If the required CFM is too low, (external static pressure is high causing motor HP output to be below table value),

a.Relieve supply and/or return duct static.

b.Change indoor fan speed and repeat steps 1 and 2.

•To Increase Fan RPM; Loosen the pulley adjustment set screw and turn sheave clockwise.

•To Decrease Fan RPM; Loosen the pulley adjustment set screw and turn sheave counterclockwise.

•If the required CFM is too high, (external static pressure is low causing motor HP output to be above table value), change indoor fan speed and repeat steps 1 and 2.

•To stop the SERVICE TEST, turn the main power disconnect switch to the “Off” position or proceed to the next component start-up procedure. Remove electro mechanical test mode connections (if applicable).

36	Packaged Heat Pump • WC-IOM-7

Image 36

Contents Packaged Heat Pump DecemberModel Number Description Contains Refrigerant Hazardous Voltage w/CapacitorsEquipment Damage From Ultraviolet UV Lights Contents Contents Model Number Description General Information Clogged Filter Switch Optional General InformationRlci ReliaTel LonTalk Communication Interface Optional Rtom ReliaTel Options Module OptionalCompressor Disable CPR1/2 Power Exhaust Control OptionalLow Pressure Control High Pressure Control OptionalLead/Lag Control Dual Circuit Only Zone Sensor Module ZSM BAYSENS007BZone Sensor Module ZSM BAYSENS009B Zone Sensor BAYSENS011BHigh Temperature Sensor BAYFRST001A Remote Zone Sensor BAYSENS013CRemote Zone Sensor BAYSENS014C Remote Zone Sensor BAYSENS016AUnit Inspection Smoke Detector Sensor OptionalFiberglass Wool First Aid MeasuresStorage Unit Clearances Unit Dimensions Unit Dimensions Unit Dimensional Data 12 1/2 Ton, 15 TonUnit Dimensional Data 20 Ton Horizontal Duct Dimensional Data 12 1/2 Ton, 15 Ton Heavy Objects Improper Unit LiftRigging Installation If a Curb Accessory Kit is not usedHorizontal Units DuctworkInstallation Factory Installed EconomizerMain Electrical Power Requirements Low Voltage Wiring AC & DC RequirementsCondensate Drain Configuration Filter InstallationField Installed Power Wiring Main Unit Power Standard WiringOptional Tbue Wiring Through the Base Electrical Option Use Copper Conductors OnlyField Installed Control Wiring Control Power TransformerHazardous Voltage Controls using 24 VAC Rtrm Smoke Detector Customer Low Voltage Wiring Smoke detector wiringInstallation Space Temperature Averaging Temperature vs. Resistance Voltage Imbalance Electrical Phasing Three Phase Motors Live Electrical ComponentsCompressor Crankcase Heaters Optional ReliaTel Controls Pre-Start Test ModesPre-Start Verifying Proper Air Flow Units with Belt Drive Indoor FanReturn Air Smoke Detector Start Up Economizer Start-UpRotating Components Compressor Start-UpStart Up Heating Start-UpScroll Compressors Final System Setup Maintenance Fan Belt Adjustment Belt Drive UnitsMaintenance Monthly Maintenance Hazardous VoltageReturn Air Smoke Detector Maintenance Cooling SeasonFilters Coil Cleaning Heating SeasonHazardous Pressures Final ProcessSample maintenance log Troubleshooting Hazardous Service ProceduresReliaTel Control Troubleshooting System Status Checkout ProcedureSystem Failure MethodResetting Cooling and Heating Lockouts Heat FailureCool Failure Zone Temperature Sensor ZTS Service Indicator Clogged Filter SwitchFan Failure Switch Test Cooling Set Point CSP and Heating Set Point HSP ZtempTest System Mode and Fan Selection Testing serial communication voltageProgrammable & Digital Zone Sensor Test ReliaTel Refrigeration Module Rtrm Default Chart Unit Operation without a Zone SensorUnit Economizer Control ECA Troubleshooting ReliaTel Control Wiring Diagrams Drawing Number DescriptionWarranty Heat PumpWarranty Page WC-IOM-7