.

Submittal DataVariable Speed Dual Circuit Non-pressurized Flow Center

Project Name:Contractor:Engineer:Order Number:Additional Information:

Technical Data

Electrical Data Approved Antifreeze

Mounting

Pump Power Curves**

Circulator:Cabinet:Tank:Insulation:Valves:

Grundfos Magna GEO* (variable spd.) and/or UPS26-99 (3 spd.)Powder coated galvanized steel Polyvinyl chloride (PVC)CFC-free polyurethane foamQuantity six 1”, 3-way, 4-position flushing and isolation/service valves. Four bottom valves have composite body and spool; Top valves have brass body and spool. All valves utilize NBR seals and stainless steel retaining ring.

Max. fluid temp.: 140°F [60°C]Min. fluid temp.: 20°F [-7°C] Max. operating press.: 13 psig [89.6 kPa]Max. ambient air temp.: 104°F [40°C]

Propylene GlycolMethanolEthanol

Flow center is designed for indoor installation only.

Flow center must be installed in an upright position as shown to the right.

The pump terminal box must be located in one of the following orientations:

Motor: 208-230V, 60 Hz, single phase, 2-pole, UL and CSA approved, internal thermal overload protection, insulation class F

GEO-FLO PRODUCTS CORPORATION905 Williams Park DriveBedford, IN 47421 U.S.A.PH: 812-275-8513; FAX: 812-275-8523www.geo-flo.com

SD 1334-1335-1336-1334N-1335N-1336N rev. 22SEP2015

NP 1 NP 2 NP V NP V2 NP Series

Pump  Motor Speed

Nominal  HP Volts Amps* Watts* Capacitor

Pump  Housing  (Volute)

Magna  GEO Variable 1/6 208-‐230 0.09  to  1.7 5  to  230 N/A Cast  IronHigh 0.9 196

Medium 0.8 179Low 0.7 150

*All  data  is  per  pump  at  230V

1/6UPS26-‐99 230 5μF/400V Cast  Iron

Pow

er in

Wat

ts

Flow Rate in GPM [l/s]

[0.13 0.25 0.38 0.50 0.63 0.76 0.88 1.00 1.14 1.26 1.39 1.51 1.64 1.77 1.89 2.02 2.15 2.27]

**Power is per pump.Page 1 of 4

Variable Speed

Constant Speed

*Available with standard or inverse profile PWM signal. Add “N” to part number for inverted profile (e.g. 1335N). Cable and/or controller required.

Models NPDV2A (1334 & 1334N), NPDV2B (1335 & 1335N), NPDV3 (1336 & 1336N)

Pump Performance Curves

Grundfos Pump Performance Curves: Magna GEO and UPS26-99(NPDV2: Magna GEO on LH side; UPS26-99 on RH side -- two pumps in parallel)

Head

(Fee

t) [k

Pa]

Flow (U.S. GPM) [l/s]

[30]

[60]

[90]

[119]

[15]

[45]

[75]

[105]

[149]

[135]

Curve when both pumps are operating

Maximum Curve for Magna GEO

[0.13 0.25 0.38 0.50 0.63 0.76 0.88 1.00 1.14 1.26 1.39 1.51 1.64 1.77 1.89 2.02 2.15 2.27]

UPS26-99 HI NPDV-2 (L) GEO (R) 99

2 6 10 14 18 22 26 30 34

Grundfos Pump Performance Curves: Magna GEO Variable Speed(NPDV2: one pump on LH side; one pump on RH side -- two pumps in parallel)

Head

(Fee

t) [k

Pa]

Flow (U.S. GPM) [l/s]

[0.13 0.25 0.38 0.50 0.63 0.76 0.88 1.00 1.14 1.26 1.39 1.51 1.64 1.77 1.89 2.02 2.15 2.27]

[30]

[60]

[90]

[119]

[15]

[45]

[75]

[105]

[149]

[135]

Magna GEO (Max)

DESIGN NOTES:1. The dual circuit flow center includes a pump(s) for each heat pump. The pump(s) for unit A is in parallel with the pump(s) for

unit B. If one side has two pumps (e.g. NDP3 or NDP4), the two pumps on each side are in series. Page 4 shows a transparent view of the flow center with internal piping.

2. When sizing pumps for a dual circuit flow center, a pressure drop calculation should be done for the entire system when both heat pumps are running. Pump selection must be based upon both units running. For example, if the left side is a 3 ton heat pump with one pump, and the right side is a 2 ton heat pump with one pump; the pumps in parallel must be able to provide adequate flow and head when both units are running. Verify with online Calculators at www.geo-flo.com, or to manually select pumps, use the curves below, which include parallel operation.

3. The internal check valves and 3-way valves must be added to the system pressure drop before selecting pumps. Page 3 includes a chart based upon the flow rate for each heat pump.

4. All pump curves are manufacturer’s reported averages using water at 68°F [20°C].

Page 2 of 4

NPDV2AMagna GEO (L)UPS26-99 (R)

NPDV2B - Magna GEO

The NPDV2A (P/Ns 1334 & 1334N) flow center uses one pump on each side. The chart to the left provides curves for a Magna GEO (variable speed)* and a UPS26-99 (constant speed) pump operating in parallel. Use these curves to determine pump selection when both heat pumps are operating. Two non-identical pumps in parallel creates a curve that is the sum of the two curves (gray line). Internal check valves are factory-installed to prevent short circuiting.

The NPDV2B (P/Ns 1335 & 1335N) flow center uses two Magna GEO (variable speed) pumps, one on each side. The chart to the left provides maximum* curves for these two pumps operating in paral-lel. Use these curves to determine pump selection when both heat pumps are operating. Two pumps in parallel provide twice the flow rate, but the head of only one pump. Internal check valves are factory-installed to prevent short circuiting.

*Above curves for Magna GEO are maximum operating curves. The Magna GEO can operate between its minimum and maximum curves, depending upon flow rate and pressure drop requirements.

SD 1334-1335-1336-1334N-1335N-1336N rev. 22SEP2015

[0.13 0.25 0.38 0.50 0.63 0.76 0.88 1.00 1.14 1.26 1.39 1.51 1.64 1.77 1.89 2.02 2.15 2.27]

Magna GEO+UPS26-99Hi

Head

(Fee

t) [k

Pa]

Flow (U.S. GPM) [l/s]

Maximum Curve,Magna GEO+26-99H

Maximum Curve for Magna GEO

[30]

[60]

[90]

[119]

[149]

[179]

[209]

[239]

Grundfos Pump Performance Curves, Magna GEO (NPDV3: Magna GEO+UPS26-99 (Hi Spd) on LH side; Magna GEO on RH side -- two sets in parallel)

Curve when all three pumps are operating

Pump Performance Curves

Page 3 of 4

NPDV3

The NPDV3 (P/Ns 1336 & 1336N)flow center uses a Magna GEO (variable speed) in series with a UPS26-99 (constant speed) on one side and a Magna GEO on the other side. The chart to the left provides curves for these two sets of pumps operating in parallel.* Use these curves to determine pump selection when both heat pumps are operat-ing. Two pumps in parallel with one pump creates a curve that is the sum of the two curves (gray line). Internal check valves are factory-installed to prevent short circuiting.

Use the chart on the left to account for the pressure drop of the internal components of the dual circuit flow center.

*Above curves for Magna GEO are maximum operating curves. The Magna GEO can operate between its minimum and maximum curves, depending upon flow rate and pressure drop requirements.

SD 1334-1335-1336-1334N-1335N-1336N rev. 22SEP2015

Dimensional Data

Flow (U.S. GPM) [l/s]

Grundfos Pump Performance Curves (single UPS26-99)

Head

(Fee

t) [k

Pa]

UPS26-99 high spd UPS26-99 med spd UPS26-99 low spd

[0.13 0.25 0.38 0.50 0.63 0.76 0.88 1.00 1.14 1.26 1.39 1.51 1.64 1.77 1.89 2.02 2.15 2.27]

[14.9]

[29.8]

[44.8]

[59.7]

[74.6]

[89.5]

[104.5]

[119.4]

A B C D E F G H I K Weight Lbs KgNPDV2A* NPDV2B* NPDV3 All  Models NPDV2A* 85 38.6

Inches 48-‐1/8 10 11-‐1/8 15-‐7/8 49-‐3/4 5 9-‐3/8 11 9-‐1/8 10-‐7/8 11 10-‐7/8 NPDV2B* 89 40.4CM 122.2 25.4 28.3 40.3 126.3 12.7 23.7 27.9 23.2 27.6 27.9 27.6 NPDV3 95 43.1

3/8"  DRIVE  SOCKET

UnitsAll  Models

J

NOTE: All connections require Flo-Link™ (double O-ring) transition fittings. Internal check valves are factory-installed.

LH Side RH Side FrontNPV2A

Pump Performance Curves

Page 4 of 4

The pump curves below represent the pumps on each side of the dual circuit flow center. For operation when only one heat pump is running, the curves below show a single pump or two pumps in series. For proper flow center selection, operation when both heat pumps are running must also be considered (previous pages).

All pump curves are based upon manufacturer’s reported averages using water at 68°F [20°C].

Flow (U.S. GPM) [l/s]

Grundfos Magna GEO 32-140 and UPS26-99 (pumps in series)

Pumps operate in seriesbetween these curves*to maintain flow rateor temperature diff.

Magna GEO + UPS26-99 (high speed)

Magna GEO (maximum curve -- highest flow/head)

Magna GEO (minimum curve -- lowest flow/head)

[0.32 0.63 0.95 1.26 1.58 1.89 2.21 2.52 2.84 3.15] 0 5 10 15 20 25 30 35 40 45 50

0

101520253035404550556065707580

[134]

[15]

[30]

[45]

[60]

[75]

[90]

[105]

[119]

[149]

[164]

[179]

[194]

[209]

[224]

[239]

Head

(Fee

t) [k

Pa]

5

*UPS26-99 is a constant speed pump; Magna GEO is a variable speed pump. When both pumps are running, the Magna GEO operates between min.-max. curves shown below to maintain set flow rate or temperature difference.

Dimensional data provided for informational purposes, and is rounded to the nearest 1/8”. Metric data is a simple conversion, and should not be considered more accurate.

SD 1334-1335-1336-1334N-1335N-1336N rev. 22SEP2015

*Pumps:2A = Magna GEO (Left), UPS26-99 (Right)2B = Magna GEO (both sides)

Models NPDV2A (1334 & 1334N), NPDV2B (1335 & 1335N), NPDV3 (1336 & 1336N)

FrontNPV3

FrontNPV2B

TopGEO-FLO PRODUCTS CORPORATION905 Williams Park DriveBedford, IN 47421 U.S.A.PH: 812-275-8513; FAX: 812-275-8523www.geo-flo.com

To tank

From tankFrom tank

Ground Loop or Flushing Connec� ons

From/ToHeat Pump #2

PipingArrangment ...

From/ToHeat Pump #1

Ground Loop or Flushing

Connec� ons

FromHPs