B&D Mfg XT User Manual

XT FLOW CENTER

INSTALLATION INSTRUCTIONS

PumpCurves

70

60

50

40

FTHD

30

20

10

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0 102030405060

FLOW GPM

NOTE: Read the entire instruction manual before starting the installation.

WARRANTY

This flow center is warranted for two years from date of sale. Alleged defective product must be returned to B&D Mfg.,
Inc., 901 9th Street, Scranton, Iowa 51462, for inspection via prepaid freight. Defective parts will be repaired or
replaced at the manufacturer’s discretion. No allowance for labor or property damage is implied. Warranty of
performance is limited to the table provided with the unit and only when being used in a closed-loop, heat pump system.
No warranty of performance is provided when pump(s) are provided by others.

INTRODUCTION

These instructions cover the installation of the XT Flow Center (Part 2-230XT-SS). The XT Flow Center is a prepackaged
pumping station to be used with closed-loop, ground source heat pumps. The package contains a water vessel, an air­eliminating dip tube, a pump protecting check valve, pump(s) and ball valves that allow the pump(s) to be removed for
service without loss of fluid to the system.

SAFETY CONSIDERATIONS

Installing and servicing of air conditioning and heating equipment can be hazardous due to system pressures and
electrical components. Only trained, qualified personnel should install, start-up and service this equipment.

Untrained personnel can perform basic maintenance functions such as cleaning coils or cleaning and replacing filters. All
other operations should be performed by trained service personnel.

When working on the equipment, observe precautions in the literature, tags, stickers and labels attached to the
equipment and to any other safety precautions that apply.

Follow all safety codes. Wear safety glasses and work gloves.

UP43‐100F

Series

Figure 1

Fig. 1.

B&D Mfg, Inc
901 9th Street
Scranton, IA 51462
Phone [phone]
Fax [phone]
www.bdmfginc.com

1

Patent No. 5,244,037

INSTALLATION

The XT Flow Center is designed to work with larger heat pumps, single coil, dual stage heat pumps. To ensure adequate
flow the head loss of the geothermal piping system must be calculated and verified with performance curve (see Fig. 1).

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. 2. Recommended Piping Schematic For
Maximum Flexibility (Required With
Internal Headers)

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 XT Flow Centers are designed to work with only one heat pump per loop field. More than
one XT 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. 2 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. 3 Illustrates a recommended piping schematic for a system with underground headers.

Piping is similar for either schematic with the exception of Fig. 2 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 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.

Fig. 3. Recommended Schematic (For Use with
Underground Headers; Flush Cart
Required)

2