Flushing & charging

All Flushing of earth loops should be performed using a

1.5HP or larger pump (as specified by IGSHPA). Flushing can be accomplished using three different methods. The first flushing method applies a one-step installation of the loop, unit and inside piping. The second method allows a

Loop Contractor to use flush cart when installing the loop, and at a later date, the dealer can install the unit to the loop using only domestic water to flush the unit. The third procedure shown is used when replacing the pump, coaxial refrigerant to water coil, or unit. The following are step-by- step procedures. Be careful not to rotate the 3-way valves into a position where air can be introduced into the loop. Reflushing will be required if this occurs. Valve position can be verified by looking on the end of the valve stem for the pattern position.

Consult the IGSHPA for more complete flushing and antifreeze instructions.

Flush in one direction for one hour, deadheading in increments - checking site glass for air pockets. Reverse flow in opposite direction, again for one hour, deadheading in increments - checking site glass for air pockets.

The presence of air can be detected by “deadheading” the pump. To deadhead the pump, close off the return to the pump and watch the water level site glass. Once you have no more than 1/2" to 3/4" drop in the site glass, you will have achieved complete air removal.

Power flushing can be achieved using the home’s city water supply (or well water) connected to the flush cart. This uses the combined pressure of the flush cart pump and the home’s water system for faster flushing.

After flushing is complete, but prior to unit start up, remove the large screw from the center of the flow center pump(s) to allow air to escape (water will drip out). Replace the screw after pump has filled with fluid.

For final pressurization, run the unit in heating or cooling for a period of 20 minutes. Following this 20 minute run time, pressurize the loop using the flush cart to 50-75 psig in winter or 40-50 psig in summer.

In areas where entering loop temperatures drop below 40°F (5°C) or where piping will be routed through areas subject to freezing, antifreeze is needed to prevent the loop from freezing inside the pipe or heat exchanger. Alcohols and glycols are commonly used as antifreeze, however, you should consult with your distributor for assistance in selecting the antifreeze best suited for your region.

Procedures for adding antifreeze

1.Flush cart should be half full of water.

2.Add measured amount of antifreeze through hose below the water level (calculate based upon loop).

3.Add antifreeze to loop side only (see valve position in

Figure 9A).

4.Pump and dump (discharge).

5.Turn off pump; close discharge valve.

6.Repeat the procedure to add remaining antifreeze to loop.

Manual	2100-518B
Page	18 of 30

DORFC-1, DORFC-2 specifications

AMABILIA DORFC-2 and DORFC-1 are two innovative technologies designed to enhance connectivity and improve communication systems. These frameworks are particularly useful in environments where traditional network infrastructure may be lacking or impractical. Both models come equipped with several key features that distinguish them from their predecessors and competitors in the field.

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AMABILIA DORFC-2, DORFC-1 Flushing & charging, Procedures for adding antifreeze

Models: DORFC-1 DORFC-2