Greenheck TSU Base Unit Manual (464441) - Manual (Page 16)

Make-Up Air Unit 16
®
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.
Start-Up - Evaporative Cooling
Recirculating (optional)
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.
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 to 45ºF
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
NOTE
If too much water is flowing
to the media, the flow can be
adjusted using the manual ball
valve. If flow adjustments are
made, verify that sufficient water
is still being supplied to the
media to keep the entire pad wet
during normal operation. Too
high of a water flow can cause
water carryover problems.
Manual Ball Valve
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.
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.
8. Put the Unit into Service
Remove the jumper and energize the blower(s). Verify
proper operation.
Auto Drain and Flush Timer
T1
Settings
T2
Settings
Timer
Scale
Timer
Scale
Timer
Settings