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Related Manuals for Geo-Flo NP Series
Summary of Contents for Geo-Flo NP Series
- Page 1 NP Base Non-Pressurized Flow Centers Installation, Operating, and Maintenance Manual Geo-Flo Corporation Main Number: 812-275-8513 905 Williams Park Drive Toll Free: 800-784-8069 Bedford, Indiana 47421, U.S.A. Fax: 888-477-8829...
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Page 3: Table Of Contents
For the most up-to-date information, please visit our website, or contact our Customer Service Department. Statements and other information contained in this document are not express warranties and do not form the basis of any bargain between the parties, but are merely Geo-Flo’s opinion or commendation of its products. - Page 4 General Description Ground Loop to Flow Center The NP Series is a family of non-pressurized flow centers used for closed-loop geothermal (ground source) heat pump systems. The NP Series flow centers utilize a water column to provide the neces- sary suction head for the circulator pump, and to ensure a flooded pump volute.
- Page 5 NPB Series Non-Pressurized Flow Centers | Available Models The NP Series of flow centers are available in several models to meet the requirements of the specific instal- lation and contractor preference. The following is a brief description of each NP product. Note that each NP product has a specific installation manual.
- Page 6 | Installation, Operating, and Maintenance Manual NP Plus (NPP) Flow Center The NP Plus has the same features as the NP but also includes an external 3-way flushing/purging valve, and a set of Flo-Link X 1-1/4” HDPE socket fusion ground loop adapters (Figures 4 and 5). This ad- ditional external 3-way valve allows the ground loop to be flushed separately from the heat pump.
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Page 7: Npb Series Non-Pressurized Flow Centers
NPB Series Non-Pressurized Flow Centers | NP Multi Circuit (NPM) Flow Center The NPM is a family of multi-circuit non-pressurized flow centers that are used for two or more geothermal heat pumps sharing the same ground loop. Since there are large number of available options for the NPM, please consult our website or the NPM literature for detailed descriptions. -
Page 8: Flow Center Pump Sizing
Flow Center sizing: Performance curves The specific NP Series flow center should be selected based on the system pressure drop (including the geo- thermal heat pump, ground loop piping, and interior piping). Calculators to assist with pressure drop deter- mination and pump selection are available at www.geo-flo.com/calculators. The flow center selected should provide at least the minimum amount of flow recommended by the heat pump manufacturer for the heat pump selected. -
Page 9: Installation
Installation Mounting the unit The NP Series flow center must be mounted on a level surface near the ground source heat pump. The unit can be placed on the floor or on an isolation pad such as a small piece of expanded... - Page 10 | Installation, Operating, and Maintenance Manual Plumbing Options: External Headers Figure 11: Plumbing diagram- external headers Plumbing Options: Internal Headers Figure 12: Plumbing diagram- internal headers...
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Page 11: Flushing And Purging
This preventable issue is a common mode of failure for circula- tors. Although the NP Series flow centers do have the ability to separate air from the loop fluid, its pumps are not powerful enough to guarantee that all air and debris can be flushed from every type of loop during the initial loop installation. - Page 12 NOTE: For detailed flushing and purging information, refer to the Flush Cart Operation Manual for the cart being used. Geo-Flo provides detailed instructions on operating the flush cart manufactured by Geo-Flo. 1. Close all three isolation valves on the NPB.
- Page 13 NPB Series Non-Pressurized Flow Centers | 10 8. Open the pump discharge isolation valve on the NPB and flush the heat pump piping with the flush cart (ensure suction isolation valve is closed). Note that you should start with the flush cart dead-head/return valve closed due to the high flow rate.
- Page 14 11 | Installation, Operating, and Maintenance Manual Flushing with Inside Headers CLOSE CLOSE FLUID SUPPLY FLUID SUPPLY Figure 16: Flushing internal headers Many contractors employ non-pressurized flow centers and internal headers to flush the ground loop when a flush cart is not available. Ball valves must be installed on each circuit to allow the flow center pump to flush one circuit at a time.
- Page 15 NPB Series Non-Pressurized Flow Centers | 12 7. Close Circuit #1 and repeat for the remaining circuits. 8. After the final circuit has been filled open the bypass valves to allow the heat pump piping to fill. 9. Close the NPB discharge valve and open the NPB suction valve. Allow fluid to push through the pumps and fill the tank 10.
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Page 16: Start Up
5. Verify the performance of the heat pump per the manufacturer’s literature by calculating the heat of extraction and/or rejection (HE-HR). The Geo-Flo website has a free calculator to assist in this calculation. Go to www.geo-flo.com, select Design Calculators then HE-HR Calculator. The HE-HR should be within the range specified by the heat pump manufacturer. - Page 17 (Figure 18). If the pressure drop is off the manufacturer’s chart, the flow rate can be determined using a free on- line calculator available on Geo-Flo’s website. Go to www.geo-flo.com, Flow gpm select Design Calculators then Flow Rate Calculator.
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Page 18: Maintenance
15 | Installation, Operating, and Maintenance Manual Maintenance There is no regularly scheduled maintenance required for the NP Series flow center. However, the fluid level in the tank should be monitored, particularly during the first several days after installation or service has been performed. - Page 19 The Residential Pressure Drop calculator available at www.geo-flo.com provides information on percent antifreeze, freeze protection level, and specific gravity for ethanol, methanol, and propylene glycol.
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Page 20: Pump High Voltage Wiring
17 | Installation, Operating, and Maintenance Manual Pump High Voltage Wiring WARNING: OPEN THE MAIN POWER SUPPLY DISCONNECT SWITCH AND SECURE IT IN AN OPEN Pump #3 Pump #4 POSITION PRIOR TO PERFORMING ELECTRICAL WORK. VERIFY THAT POWER HAS BEEN DISCON- Wiring for Wiring for and NPD... -
Page 21: Optional Pressure Relief Piping
NPB Series Non-Pressurized Flow Centers | 18 Optional Pressure Relief Piping All NP flow centers include pressure relief and vacuum relief. NP Base flow centers include vacuum relief built into the cap, but pressure relief is separate as shown in Figure 22. A dust cover is installed at the factory and typically does not need to be removed. -
Page 22: Troubleshooting
Water l eaks o ut v alve f ace Debris i n v alve Rotate v alve 3 60 d egrees t o dislodge d ebris Remove ... - Page 23 NPB Series Non-Pressurized Flow Centers | 20 Manual Updates Table Date Description of Changes Pages 30MAR2021 First published...
- Page 24 888-477-8829 Geo-Flo Corporation is continually working to improve its products. As a result, the design and specifications of products in this catalog may change without notice and may not be as described herein. For the most up-to-date information, please visit our website, or contact our Customer Service department.
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