Flow center initial startup

1.Check to make sure the loop and unit isolation valves are completely open and the flush ports are closed and sealed (see Figure 9D).

2.Geothermal units have two low pressure switches installed. One switch is intended for Ground Water Applications (default factory wired - blue wires), and the second is intended for Ground Loop Applications

(yellow wires). Remove the “blue” wires from the LPS terminals of the compressor control module internal of the control panel of the geothermal heat pump and replace with the yellow low pressure switch

wires (see unit wiring diagram).

3.Check and record the earth loop pressure (use P/T ports at geothermal heat pump).

Loop Pressure_____IN_____OUT

4.Check and record flow rate.

FLOW RATE - _____GPM

5.Check performance of unit. (Refer to Geothermal Heat Pump Installation Manual.)

procedure for pressurizing the system

1.Once system is completely flushed and antifreeze is added, it can then be pressurized. Perform this by deadheading the pump by closing the return hose ball valve. This will increase the pressure on the loop via the flush cart pump. As the pressure will fluctuate with the seasons (set higher in winter and lower in summer), it is suggested that the initial loop pressure be 50-75 psig in winter and 40-50 psig in summer. If you cannot reach these pressures with the flush cart pump alone, turn on the fresh water feed to the cart while still deadheading the pump. The potable water pressure, along with the pump, will increase the amount of pressure in the loop.

2.Bleed any air from the inside of the pump. This can be done by removing the bleed screw from the center of the pump motor head, allowing a small amount of fluid to drip out. Replace the bleed screw.

3.Rotate the flow center valves to isolate the flush cart from the rest of the system (see Figure 9D).

4.Turn off the flush cart pump, relieve the pressure on the hoses and remove them.

5.Replace flow center access plugs and caps.

NOTE: If the flow center is mounted in the horizontal position, the supply hose must be connected to the lower flushing port to allow air to pass out of the upper port during the final flushing.

pressure/temperature plugs

The pressure/temperature plugs (P/T plugs) supplied with the ground water connectors are provided as a means of measuring flow and temperature (see Figure 10). The waterflow through the unit can be checked by measuring the incoming water pressure at the supply pressure P/T and subtracting the leaving water pressure at the return water P/T plug. Comparing the differential to the pressure drop/ flow chart (Table 3) will determine the flow rate through the heat pump.

Example: Model GV51S1 with a measured pressure drop of 5.1 psig is equivalent to 9 GPM flow.

GPM rates higher than the required minimum flow rates will not be detrimental to performance. However, insufficient flow can significantly reduce capacity, efficiency and create nuisance trips of safety controls, and possibly damage to components in extreme conditions.

NOTE: Pressure/Temperature probes should be lubricated with a water-based lubricant prior to gently pushing the probes into the P/T ports to prevent internal damage. Thermometers, probes and gauges are available for conducting these tests.

Manual	2100-518B
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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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