Greenheck Fan 45, HRE-20, 90, 55 manual Troubleshooting for evaporative module, Symptom Solution

Page 15

Troubleshooting for evaporative module

Symptom

Solution

 

Insufficient water

A. Check water level in base pan.. The

 

volume or recirculation

level should be at 1 inch..

 

pump not operating

B. Check the pump filter at the inlet..

C

 

Clean the filter if clogged or dirty.

 

 

C.If pump is not operating, check wiring for loose connections and proper voltage..

D.Clogged or worn out pump..

 

E. Clogged header..

Header

 

F. Water flow adjustment device

Detail

Irregular water

Water distribution header, orifices or media partially blocked or plugged..

distribution on cooling

Remove evaporative cooler from unit..

 

media

Disassemble and clean distribution header, orifices and media..

 

 

 

Scale and mineral

A. Increase bleed rate..

 

deposit formation on

B. Increase water flow rate.. Media is self-cleaning with flow rate of 11/2 to 2

gpm per square foot of media top area.. Generally this flow rate prevents

face of media

dissolved solvents from collecting on the media.. To prevent further

 

 

trouble, flush and clean the system more frequently..

 

C.Check water flow across the face of the media.. Irregular water distribution must be corrected (see above)

D.If this condition persists, chemicals may need to be added.. Water pH should be maintained between 6 and 8..

Water Carry-Over

A. Irregular water distribution on face of media (see above)..

 

 

B. Average face velocity exceeds 550 fpm.. Decrease fan rpm and airflow..

 

C. Localized face velocities exceeding 550 fpm.. Air filters or media face area

 

is partially blocked.. Clean or replace air filters and media..

 

 

D. Check the overflow for blockage..

 

 

Inadequate cooling

A. Irregular water distribution over face of media (see above)..

 

 

B. Check for uniform airflow..

 

 

 

C. Check outside wet-bulb temperature.. High wet-bulb temperatures can

 

decrease performance.

 

 

 

D. Check water flow rate over media.. Flow rate should be 11/2 to 2 gpm per

 

square foot of media top area..

 

 

Excessive water

A. Check the water bleed off rate and make sure that it is not excessive..

discharge into drain

B. Check water level in base pan.. The level should be at 1 inch..

 

Poor performance

Pad installed backwards.. To get the

 

45°

after cooling pad

performance from the cooling pads,

 

 

 

replacement

they must be installed properly.. The

 

 

pads are manufactured with 15/45

 

 

 

 

 

 

degree flute angles.. The pads must

Entering Air

Leaving Air

 

always be installed with the steeper

 

 

 

 

flute angle sloping down toward the

 

 

 

entering air side.. See figure on right..

 

 

 

 

 

15°

15

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Contents Read and Save These INSTRUCTIONS461248 Indirect Evaporative CoolerDirect Evaporative Cooler TABLE OF Contents StorageBasic Operation Installation Safety WarningLifting Roof Curb Mounting Exhaust Weatherhood Rail MountingDuctwork Connections Supply WeatherhoodElectrical Information Exploded Detail Terminal Strip TYPICAL CONTROL CENTER COMPONENTSService Clearances / access panel locations HRE-20 HRE-45HRE-55 HRE-90 Dimensional data Dimensional Data / Access Door DescriptionsModel Exterior Dimensions HRE-20 Overall Exterior Dimensions ModelEvap Module START-UP Evap Module InstallationStandard Trap and Supply Line Configuration Evaporative Cooling ModulesWater Flow Adjustment DevicePump and Float Components HRE Water SUPPLY CONNECTION LocationTop View Auto Drain and Fill with Freeze Protection EvaporativeEvaporative FreezeTimer ProtectionTrap & Supply Line Configuration with Auto Drain and Fill Water Control Options for Evaporative CoolingDrain Trap Drain and Overflow Connection Locations Symptom Solution Troubleshooting for evaporative moduleEvaporative Cooling Maintenance Post-Heater Control Panel Optional accessoriesElectric Heater Application/Operation Electric PreheaterFrost Control Application/Operation Frost Threshold TemperaturesTimer TestingModulating the Wheel Enthalpy Sensor With Override Economizer Application/OperationYaskawa Yaskawa E7 Variable Frequency Drives for BlowersFactory Setpoints Modulating Control 0-10 VDC for FAN Speed Variable Frequency Drives for Energy Recovery WheelTransformer Wiring DiagramDirty Filter Sensor Rotation SensorService Outlet CO2 SensorVapor Tight Lights Remote Control Panel and Wiring Schematics Optional AccessoriesIndicator Lights powered by the ER Unit Remote Panel Wiring SchematicsHeating/Cooling Switches and Night Setback Switch/Timer Sensors Mounted by Factory Temperature Sensors 1K Ohm RTDStart-Up Checklist for unit Safety DangerSafety Caution Start-Up Checklist Start-Up Checklist for Evaporative CoolerSpecial Tools Required Variable Frequency Drives section Optional Accessories ChecklistOptional Accessories section Economizer Application / Operation sectionFan Belt Drives Unit start-upFans Forward Curved Type Fan Performance ModificationsRotation Direction Direction of Fan Wheel RotationFan RPM VibrationDrive Belt Air SealsInside layout of HRE unit Date Routine maintenanceFan Motors LubricationDampers Fan BeltsBearings External Filter MaintenanceInternal Filter Maintenance Door Seal MaintenanceEnergy Recovery Wheel Maintenance Access to wheel through Outdoor air filter doorWheel segment removed Wheel Bearing Wheel Belt & PulleyModel HRE Parts ListWinter Operation Sequence of OperationBasic Unit Summer OperationMeasured Airflow Pressure Drop Across Energy Recovery WheelTest and Balance Report Design AirflowSymptom Possible Cause Corrective Action TroubleshootingWarranty
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45, 55, 90, HRE-20 specifications

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