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EKW FX10 INSTALLATION MANUAL
Earth-Coupled Systems with Flow Center
Once piping is completed between the unit, flow center and the earth loop, final purging and charging of the loop is
needed. A flush cart (at least a 1.5 HP or 1.12 kW 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. Maintain the pH in
the 7.6-8.2 range for final charging.
Flush the system adequately to remove as much air as possible. Then, pressurize the loop to a static pressure of 50-75
psi [345-517 kPa]. This is normally adequate for good system operation. Ensure that the flow center provides adequate
flow through the unit by checking pressure drop across the heat exchanger and by comparing it to the figures shown in
the tables on page 36. Usually, 3 GPM/ton [0.054 L/s/kW] or minimum 2.25 GPM/ton [0.04 L/s/kW] of cooling capacity is
needed in closed loop earth-coupled applications.
Line Voltage
Disconnect
Earth-Coupled Loop
Piping with Insulation
Unit Connector Kits
with Insulation
Vibration Absorbing
Mesh or Air Pad
Load Liquid
Connections
P/T Plugs
Figure 7: Typical Closed Loop Earth-Coupled Installation