Greenheck ERCH (476054) - Manual (Page 51)

General Description - NOT model specific Model ERCH Energy Recovery Ventilator
®
51
Symptom Possible Cause Corrective Action
Insufficient water
volume or recirculation
pump not operating
Water level in sump pan too low.
Check water level in sump pan. Water level should be
maintained at greater than one inch.
Pump filter clogged.
Check the pump filter at the inlet. Clean the filter if
clogged or dirty.
Pump not getting power.
If pump is not operating, check wiring for loose
connections and proper voltage.
Clogged header.
Remove media from unit
and remove media cover
to visually inspect header
assembly. Clear holes
with drill if necessary.
Water flow adjustment device improperly set. Check water flow adjustment clamp for proper setting.
Irregular water
distribution on cooling
media Clogged header.
Water distribution header, orifices or media partially
blocked or plugged.
Water flow adjustment device improperly set. Check water flow adjustment clamp for proper setting.
Scale and mineral
deposit formation on
face of media
Water mineral concentration too high. Increase bleed rate.
Water flow rate too low.
Increase water flow rate. Media is self-cleaning with
flow rate of 1-1/2 to 2 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.
Header partially clogged.
Check water flow across the face of the media. Irregular
water distribution must be corrected (see above).
Poor quality supply water.
If this condition persists, chemicals may need to be
added. Water pH should be maintained between
6 and 8.
Water Carryover
Header partially clogged. Irregular water distribution on face of media (see above).
Unit moving too much air volume.
Average face velocity exceeds 550 fpm. Decrease fan
rpm and airflow.
Non-uniform airflow across entering media
face.
Localized face velocities exceeding 550 fpm. Air filters
or media face area is partially blocked. Clean or replace
air filters and media.
Sump overflow drain not operating. Check the overflow for blockage.
Inadequate cooling
Header partially clogged.
Irregular water distribution over face of media (see
above).
Unit moving too much air volume.
Average face velocity exceeds 550 fpm. Decrease fan
rpm and airflow.
Poor weather conditions for application.
Check outside wet-bulb temperature. High wet-bulb
temperatures can decrease performance.
Water flow rate too low.
Check water flow rate over media. Flow rate should be
1-1/2 to 2 gpm per square foot of media top area.
Excessive water
discharge into drain
Bleeder valve improperly adjusted.
Check the water bleed off rate and make sure that it is
not excessive.
Water level in sump pan too low.
Check water level in sump pan. The level should be at
one inch.
Troubleshooting – Evaporative Cooling
C