B&D Mfg EA-KFC - Manual (Page 2)

The recommended piping schematic is usable with all types of closed-loop, ground source heat pump systems, vertical
bore holes, horizontal loops, slinky, outside headers or inside headers. This recommended method allows for isolating
the heat pump or the loop field for separate flushing and purging. Additionally, the flow through the loops can be
reversed, which may be required when using external headers.
NOTE: The EA
®
Flow Centers are designed to work with one common loop field. More than one flow
center on a common loop field will not work properly. Call B&D Mfg., Inc. for information on equipment
designed for multiple heat pumps.
Fig. 4 Illustrates a recommended piping schematic that can be utilized when an internal header is used and separate
purging of the heat pump and the ground loop is not required.
It is recommended that a tee with a threaded plug is located between the heat pump and the ground loop. This
plug allows the air to be vented from the system piping and will help remove air from the system during start up.
NOTE: Loops should not contain any dirt or debris prior to connecting to the flow center.
Fig. 5 Illustrates a recommended piping schematic for a system with underground headers.
Piping is similar for either schematic with the exception of Fig. 3 showing all earth loops penetrating the mechanical area
of the interior wall. Provide ball valves and P/T ports where indicated. Ball valves shall be the same as pipe size or
greater. The flow center should be fastened to the wall with the bracket provided and all piping should be adequately
supported. All piping shall be properly sized for the flow rate (GPM) required by the system. Reduce pipe size only at
flow center and heat pump as necessary to make connections.
PROCEDURE 1—FILL AND FLUSH A NEW SYSTEM
On systems where the ground loop has been filled and flushed by the loop installer, skip to Procedure 3.
Ensure that all piping is installed according to one of the piping schematics.
NOTE: Incorrect piping may not eliminate the air pockets.
1. Open the top of the canister and fill with clean potable water.
2
INSTALLATION
The EA
®
has two separate pumping circuits designed to work with two heat pumps or a large dual stage heat pump with
two circuits. Each pumping circuit shall be checked with the performance curves (See Fig. 1 ,2 & 3). To ensure adequate
flow, the selection must be based on your specific system design. Total system flow shall be no greater than 28 GPM.
The flow center must be located between the heat pump and the ground source system heat exchanger. Location should
be selected on the basis of ease of installation and future service. The flow center is used for filling, flushing, air
elimination, adding anti-freeze and operating the system. This flow center should never be pressurized.
Fig. 4. Recommended Piping Schematic For
Maximum Flexibility (Required With
Internal Headers)
Fig. 5. Recommended Schematic (For Use with
Underground Headers; Flush Cart
Required)