B&D Mfg Multizone User Manual

MULTIZONE FLOW CENTER

INSTALLATION INSTRUCTIONS

Fig. 1.

26-99 Pump Center Flow Chart

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

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.

These instructions cover the installation of the Multizone Flow Center Part No. CFCB-XXXX-XX and CFCC-XXX-XX. The
Multizone Flow Center is a prepackaged pumping station to be used with closed-loop, ground source heat pumps. The
package contains a water vessel, an air-eliminating 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

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.

Fig. 2.
26-116 Pump Center Flow Chart

WARRANTY

INTRODUCTION

SAFETY CONSIDERATIONS

Fig. 3.

NRF36 Pump Center Flow Chart

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 Multizone is designed to work with up to four heat pumps or four heat pump 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.

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 Schematic (For Use With

Internal Headers)

Fig. 5. Recommended Schematic (For Use with
Underground Headers; Flush Cart Required)

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 Multizone 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.

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.

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.

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

NOTE: Incorrect piping may not eliminate the air pockets.

1. It is recommended that the loop field is filled, flushed and purged with a flush cart.

NOTE: Properly isolate the flow center with a valve before and after the canister prior to flushing and
purging the loop field.

2