Flow Controller 3
R e v. : F e b u r a r y 9 , 2 0 1 6
10
G e o t h e r m a l H e a t P u m p S y s t e m s
Flushing the Earth Loop
Figure 10a: Valve Position A - Loop Fill
Unit
Garden
Hose
Flow
Controller
Loop
Valve
Position
Flush Cart
Figure 9a: Typical Cleanable Flush
Cart Strainer (100 mesh [0.149mm])
Figure 9b: Cam Fittings for Flush Cart Hoses
Attach
to Flow
Controller
Flush Port
Connect
to Flush
Cart Hose
(1 of 2)
NOTICE:
A hydrostatic pressure test is recommended on ALL
piping, especially underground piping before final backfill per
IGSHPA and the pipe manufacturers recommendations.
Front of F
.C.
Valve Position
�
WARNING!
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Once piping is completed between the unit, Flow Controller
and the ground loop, final purging and charging of the loop
is needed.
A flush cart (at least a 1.5 hp [1.1kW] pump) is needed to
achieve adequate flow velocity in the loop to purge air and
dirt particles from the loop itself. Antifreeze solution is used
in most areas to prevent freezing. All air and debris must be
removed from the earth loop piping system before operation,
Flush the loop with a high volume of water at a high velocity
(2 fps [0.6 m/s] in all piping), both directions using a filter
in the loop return line, of the flush cart to eliminate debris
from the loop system. See charts 6a through 6e for flow rate
required to attain 2fps [0.6 m/s]. The steps below must be
followed for proper flushing.
Fill loop with water from a garden hose through flush cart
before using flush cart pump to ensure an even fill and
increase flushing speed. When water consistently returns
back to the flush reservoir, switch to valve position B.
WARNING!
Disconnect electrical power source to prevent
injury or death from electrical shock.
