Greenheck DG/DGX Pilot Ignition (470651_IOM) - Manual (Page 19)

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 1 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. 8. Put the Unit into Service
Remove the jumper, and energize the blower(s). Verify
proper operation.
Start-Up - Evaporative Cooling
Recirculating (optional)
Leaving Air Entering Air
45º
15º
Media Orientation
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.
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.
7. Set the Optional Auto Drain and Fill
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
Bleed-Off
Valve
Overflow
Pump
Filter
Threaded Float
Adjustment
Supply
Connection
Float
Valve
Evaporative Cooler Set-Up
to 45º 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.
Set the Timer Scale and Settings dials:
• T1 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
IMPORTANT
Check the media for minerals after two weeks of
service and adjust the bleed-off rate accordingly.
Auto Drain and Flush Timer
T1
Settings
T2
Settings Timer
Scale
Timer
Scale
Timer
Settings
Model DG / DGX Pilot Ignition Make-Up Air 19
®