Greenheck Fan HRE-90, HRE-20, HRE-45 Trouble Shooting for Evaporative Module, Symptom Solution

Page 9

TROUBLE SHOOTING FOR EVAPORATIVE MODULE

Symptom

Solution

 

Insufficient water

A. Check water level in base pan. The level should be at 2 inches.

 

volume or recirculation

B. Check the pump filter at the inlet. Clean the filter if clogged or dirty.

pump not operating

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

 

voltage.

 

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. Check water flow across the face of the media. Irregular water distribution

deposit formation on

must be corrected (see above)

 

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

face of media

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

 

 

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

 

flush and clean the system more frequently.

 

 

C. 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 650 fpm. Decrease fan rpm and airflow.

 

C. Localized face velocities exceeding 650 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 air flow.

 

 

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 2 inches.

 

Poor performance after

Pad installed backwards. To get the

 

cooling pad

performance from the cooling pads,

 

replacement

they must be installed properly. The

45°

pads are manufactured with 15/45

 

 

 

 

degree flute angles. The pads must

 

 

always be installed with the steeper

 

 

flute angle sloping down toward the Entering Air

Leaving Air

 

entering air side. See figure on right.

 

 

 

15°

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Contents Read and Save These Instructions INSTALLATION, Operation and Maintenance ManualTable of Contents StorageGeneral Installation LiftingRecommended Roof Opening Duct Work Connections Roof Curb MountingSupply Weatherhood Exhaust WeatherhoodInstallation Electrical ConnectionsTypical Control Center Components TOP View Service Clearances / Access Panel Locations for Model HREEvap Module Start-Up Evaporative Cooling ModulesWater Control Options for Evaporative Cooling Symptom Solution Trouble Shooting for Evaporative ModuleEvaporative Cooling Maintenance Water Coil Application Recommendations Electric Preheater Electric Heater APPLICATION/OPERATIONFrost Control APPLICATION/OPERATION Dirty Filter Switch SetupAuto DRY Cycle Economizer APPLICATION/OPERATIONPre-Start Check List Start UP ChecksEnergy Recovery Wheel FAN RPMCoils FAN Belts Routine MaintenanceMotors Wheel and FastenersExternal Filter Maintenance Internal Filter MaintenanceVibration Water Coil Maintenance Coil MaintenanceFilters Maintenance of the Energy Recovery Wheel Routine Energy Recovery Wheel MaintenanceRemoving the Energy Recovery Wheel Segments Model HRE Parts ListTrouble Shooting Warranty Trouble Shooting
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