19
IOM, XT Models
Enertech Global
Flush Cart Design
The Enertech Manufacturing flush cart has been
designed to effectively and efficiently flush the
earth loop and to facilitate injecting and mixing of
the antifreeze. The single most important element
in flow 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 flush 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
Flushing & Charging a Pressurized Flow
Center
Once piping is completed between the unit, flow
center, and the earth loop, final purging and
charging of the system is needed. A flush cart (at
least a minimum of 1.5 hp pump motor or larger)
is needed to achieve adequate flow 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 flush
ports located on the flow center are access to the
piping system for the flush cart. See figure 7 for
connection details.
The 3-way valves on the flow center include
direction indicators on the valves which determine
the flow path. 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.
Figure 9: Enertech Flush Cart
Section 5: Unit Piping Installation
Step 1: Flushing the Earth Loop
1. Connect flush cart hoses to flow center flush
ports using proper adapters #AGAFP.
2. Connect water supply to hose connection on
return line of flush cart.
3. Turn both 3-way valves on flow center to flush
ports and loop position.
4. Turn on water supply (make sure water is of
proper quality).
5. As the reservoir fills up, turn the pump on and off,
sucking the water level down. Do not allow the
water level to drop below intake fitting to the
pump.
6. Once the water level remains above the water
outlet in the reservoir leave the pump running
continuously.
Figure 10: Flush Cart Pump Curve
0 10 20 30 40 50 60 70 80 90
CAPACITY - U.S. GPM
120
110
100
90
80
70
60
50
40
30
20
10
Total H
ead in F
eet
SUCTION LIFT
25’
20’
15’
Meyers QP-15
1-1/2 HP Self-Priming
Centrifugal Pump