Greenheck ERCH (476054) - Manual (Page 38)

General Description - NOT model specific Model ERCH Energy Recovery Ventilator
®
38
7. Set the Optional Auto Drain and Flush. This
system will automatically drain the sump tank and
fill it with fresh water at the field-adjustable intervals,
typically once every 24 hours. This flushes mineral
build-up and debris from the tank to promote low
maintenance and increase media pad life.
In addition, the system will protect the evaporative
cooler from freezing by draining the sump tank and
supply line when the outside temperatures fall below
the set point of the outside air sensor. This is set
to 45° F and is not adjustable. The auto drain and
fill outdoor air sensor should be installed in an area
that is shaded from direct sunlight so the outside air
sensor probe will detect an accurate air temperature.
Evaporative Cooler
1. Check the Installation. The media may have been
removed during installation, so its orientation should
be double
checked. The
media should
be installed
with the
steeper flute
angle sloping
down towards
the entering
air side.
Verify that the stainless steel caps and distribution
headers are in place. The headers should be located
over the media towards the entering air side. The
caps should be placed over the headers.
2. Check the Pump Filter. Check that the pump filter is
around the pump inlet.
3. Fill the Sump and Adjust the Float. Turn on the
water supply and allow the sump tank to fill. Adjust
the float valve to shut-off the water supply when the
sump is filled to within one inch of the bottom of the
overflow.
4. Break-In the Media. Open the bleed-off valve
completely and saturate the media with the blower(s)
off for no less than 20 minutes.
5. Check the Flow Rate. The pumps should provide
enough water to saturate the media in 45 to 60
seconds. Consult the factory if adequate flow is not
achieved.
6. Adjust the Water Bleed-Off Rate. The water bleed-
off rate is dependent on the water’s mineral content.
The bleed-off should be adjusted based on the
media’s mineral deposits after two weeks of service.
Leaving Air Entering Air
45º
15º
Media Orientation
IMPORTANT
Check the media for minerals after two weeks of
service and adjust the bleed-off rate accordingly.
Bleed-Off
Valve
Overflow
Pump
Filter
Threaded Float
Adjustment
Supply
Connection
Float
Valve
Evaporative Cooler Set-Up
NOTE
A jumper will need to be installed in the control center
to power the evaporative pumps with the blower(s)
off. Reference the unit’s ladder diagram to determine
proper terminals.
Set the Timer Scale and Settings dials:
• t timer setting set to 10 and timer scale set to
1d for 1 day of operation
• T2 timer setting set to 10 and the timer scale set
to 10m for 10 minutes of drain time
8. Put the Unit into Service. Remove the jumper, and
energize the blower(s). Verify proper operation.
Timer
Scale
Timer
Scale
Timer
Settings
T1
Settings
T2
Settings
Auto Drain and Flush Timer