Enertech VS Series - Flushing & Charging a Pressurized Flow Center; Water Quality; Removing Debris During Flushing; Flush Cart Design

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Enertech Global IOM, VS/VT Models, Rev A
Flushing & Charging a Pressurized Flow Center
Once piping is completed between the unit, ow
center, and the earth loop, nal purging and
charging of the system is needed. A ush cart (at
least a minimum of 1.5 hp pump motor or larger)
is needed to achieve adequate ow velocity (2
fps in all piping) in the loop to purge air and debris
from the loop piping (unless the header manifold is
located inside and has isolation valves). All air and
debris must be removed from the system before
operation or pump failure could result. The ush
ports located on the ow center are access to the
piping system for the ush cart. See Figure 5 for
connection details.
The 3-way valves on the ow center include
direction indicators on the valves which determine
the ow path (see Figure 6). A 3/8” socket drive is
required to operate the 3-way valves. The valves
will turn in either direction, 360 degrees. Make sure
during this process that the valves are in the same
position so that air does not become trapped in the
system.
Water Quality
Even on a closed loop system water quality is an
issue. The system needs to be lled with clean water.
If the water on site has high iron content, high
hardness, or the PH is out of balance, premature
pump failure may result. Depending upon water
quality, it may need to be brought in from off site.
Removing Debris During Flushing
Most ow center or pump failures are a result of
poor water quality or debris. Debris entering the loop
during fusion and installation can cause noise and
premature pump failure. Enertech recommends a
double ush ltering method during purging. When
purging, use a 100 micron bag lter until air bubbles
are removed. Remove the 100 micron bag, replace
it with a 1 micron bag and restart the ushing.
Flush Cart Design
The Enertech Manufacturing ush cart has been
designed to effectively and efciently ush the
earth loop and to facilitate injecting and mixing of
the antifreeze. The single most important element
in ow center reliability is the ability to remove all
the air and debris from the loop and to provide the
proper working pressure.
Features of the ush cart:
• Cylinder: HDPE, SDR15.5, 10” dia. (10 Gallons)
• Pump: Myers High Head QP15, 1.5hp, 115V
• Hose connections: Cam Lock quick connects -
1-1/2” hoses
• Hand Truck: 600lb rating with pneumatic tires
• Wiring: Liquid Tight metal on/off switch
• Tubing: SDR11 HDPE
• Connections: 2 - 3/4” connections for antifreeze
and discharge
• Drain: one on the pump and the tank
Step 1: Flushing the Earth Loop
• Connect ush cart hoses to ow center ush
ports using proper adapters #AGAFP.
• Connect water supply to hose connection on
return line of ush cart.
• Turn both 3-way valves on ow center to ush
ports and loop position.
• Turn on water supply (make sure water is of
proper quality).
• As the reservoir lls up, turn the pump on and off,
sucking the water level down. Do not allow the
water level to drop below intake tting to the
pump.
• Once the water level remains above the water
outlet in the reservoir leave the pump running
continuously.
• Once the water level stays above the “T” in
the reservoir, turn off the water supply (this also
allows observation of air bubbles).
Section 5: Unit Piping Installation