12
FLOW CENTER INSTALLATION AND LOOP FLUSHING MANUAL
Flushing and Filling Earth Loop and Unit(s) Together
All air and debris must be removed from the earth loop piping system before operation. Flush the loop with a high vol-
ume of water at a high velocity (.6 m/s) (2 fps in all piping). The manufacturer has a fl ush cart available which performs this
function. The steps below must be followed for proper fl ushing.
Connect the unit and loop to the fl ow center.
Assemble and attach the pressure measurement adapters to the access ports located on the fl ow center.
Connect the fl ush cart hoses to the adapters on the fl ow center.
Fill closed loop (outside) evenly with domestic water and discharge the return water by adding water to the fl ush cart
until water returns to the reservoir. The return water should be fi ltered or discharged to remove debris.
Fill the cart 2/3 full for initial fl ushing.
Flush in one direction only.
Flush the lowest portion of the system fi rst. Depending upon the individual layout, this could be the loop or the unit.
Restart pump. Once you have a steady fl ow of water on the return side from the system, deadhead the pump by closing
the ball valve on the hose returning to the reservoir. This will generate maximum pressure on the system. While the
return ball valve is closed, note the fl uid level in the reservoir. If all the air is purged from the system, the level will drop
only 1-2 inches in a fl ush cart with an 8-inch PCV reservoir (about 1/2 gallon), since water is not compressible.
This is
the only way to tell if the air is purged from the system.
Open valve quickly. Wait one minute, then deadhead again.
Repeat this process until all air is purged from the system.
Repeat step 8 for the higher elevation side of the system.
After fl ushing both sides of the system, reset fl ow control valves to fl ush the entire system. Repeat Step 8.
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Flushing & Charging (cont.)
Figure 9a: FPT Style
Figure 9b: GL Style
HEAT PUMP
CONNECTIONS
GROUND LOOP
CONNECTIONS
Valve Positioning
