Grundfos Geo-Flo MAGNA3 Bedienungsanleitung

Installation Information

Wiring

Plumbing

Start-Up

Control Mode Settings

Multi-Pump Setup

Faults

IM1542EW 04/15

MAGNA3 Insulated Pumps Installation Manual

MAGNA3

Insulated Pumps

MAGNA3 INSULATED PUMPS INSTALLATION MANUAL

Table of Contents

Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

General Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Determining the Pump Control Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Multi-Pump Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Antifreeze Selection and Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Pressure Drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

MAGNA3 INSULATED PUMPS INSTALLATION MANUAL

1 - 3

040 080 B

11 12

4 -10

M3S

Pump Series

M3S = Grundfos Magna3 single insulated pump

M3C = Grundfos Magna3 single insul. pump with check valve

Available Models

040-080 = 40-80 single head, 2” ball isol. valves, 2” NPT connections

040-120 = 40-120 single head, 2” ball isol. valves, 2” NPT connections

040-180 = 40-180 single head, 2” ball isol. valves, 2” NPT connections

Note: Use model M3C for two pumps in primary/backup or cascade mode

Standard/Special

C = Cast iron volute

Voltage

B = 208-230/1/60

Model Nomenclature

MAGNA3 INSULATED PUMPS INSTALLATION MANUAL

The MAGNA3 pump is mounted on a wood base for shipment. Remove the four bolts that attach the pump to the wood base. Always

install the pump with motor shaft horizontal and the control box with the Grundfos logo in vertical position as shown below.

To rotate the pump head control box, loosen the screw in the clamp holding the pump head and pump housing together with a 5 mm Allen

wrench. WARNING: If the screw is loosened too much, the pump head will be completely disconnected from the pump housing. Carefully

rotate the pump head to the desired location. Position the clamp so that either the hole or the gap in the clamp is in a downward position.

Due to the pressure sensor wiring it is not recommended to move the clamp to the other side. See figure 1. Tighten the screw to minimum

6 + / - 0.7 ft-lbs (8 + / - 1 Nm)



Figure 1: Clamp

General Installation Information

MAGNA3 INSULATED PUMPS INSTALLATION MANUAL

Determining the Pump Control Mode

The MAGNA3 has a number of control modes for a variety of applications. However, for geothermal installations there are only two

control modes that are applicable, Constant Pressure and Constant Curve. Most of the other modes are for boiler applications, and

are not recommended.

Constant Pressure:

A central variable speed pump is common for geothermal applications of three or more heat pumps due to the opportunity for

energy savings. Figure 2 provides an example piping diagram. The central pump is controlled based upon pressure differential.

As the water valves open and close based upon the operation of the heat pump, the system pressure changes, causing the

pump to adjust speed to attain the water flow needed. For example, if only one of five heat pumps is running, the pump speed

adjusts to the flow rate needed for the one heat pump, dramatically reducing pump Watts compared to when the pump is running

at maximum flow.

Constant Curve:

Because the MAGNA3 uses a very efficient motor, the pump may be used as a constant speed pump in applications where

variable speed is not necessary or desired.

FCV

T T T T

Modulating

Water Valve Automatic Flow

Control Valve Ball Valve

Heat

Pump

Ground Loop Piping

VFD

Expan.

Tank

Two-Pipe System, Variable Speed Pump:

The central pump is controlled based upon pressure differential.As the modulating water valves

open and close based upon the operation of the heat pump, the system pressure changes,

causing the pump to adjust speed to attain the water flow needed for the number of heat pumps running.

2” 3-way valves

with flush ports

(2) FPL8

Figure 2: Typical central pump application, using constant pressure control and modulating water valves.

MAGNA3 INSULATED PUMPS INSTALLATION MANUAL

Figure 3: Control Box Front Cover

Figure 4: Start/Stop Jumper

Remove the 5 screws on the front cover of the control box with a T20 Torx driver. The Start/Stop jumper and electrical connections are

located beneath the cover. Before attaching power, remove the Start/Stop jumper located inside the pump control module (remove the

entire green plug with the grey jumper). This will prevent the pump from starting when powered.

Complete the high voltage wiring to the pump. Locate the power supply plug and conduit adapter in the box supplied with the pump.

Connect wiring from pump disconnect to the pump terminal block as shown in Figure 5. Pump terminals are labeled L, N, and ground

(symbol). Connect L to L1 and N to L2. Wiring must meet all applicable code requirements, including requirements for wire protection, such

as conduit. Wire and breaker/fuse size must be determined based upon pump nameplate ratings.

Wiring

VERIFY PUMP NAMEPLATE VOLTAGE BEFORE CONNECTING HIGH VOLTAGE WIRING.

L (L1)

N (L2)

Figure 5: High Voltage Wiring

5x T20 Screws

Start/Stop Jumper

MAGNA3 INSULATED PUMPS INSTALLATION MANUAL

Wiring cont.

For ease of setting up the pump it is best to leave the start/stop jumper in place until after the pump starts is completed. Once the

pump start up is completed, the start/stop jumper can be removed and the S/S and ground connections made. For multi-pump

configurations the start/stop will be used on the secondary pump.

There are two options available to turn on and off the MAGNA3 pump. Depending on the application loop pump linking or the

MAGNA3RELAY can be used to turn on and off the MAGNA3 pump.

Loop Pump Linking – NOTE: This feature is not available with the Aurora Base Controls (ABC only). Loop pump linking

can be achieved by connecting the SL terminals on connector P2 in both units with 2-wire thermostat wire. These terminals

are polarity dependent (see figure 6). The MAGNA3 pump will turn on when any of the linked units sees a call. Once the

call from all of the linked units has went away the pump will turn off. The installer will need to supply a SPST 230VAC coil

relay and two-conductor 18AWG thermostat wire (see figure 7).

NOTE: If high voltage is connected to the MAGNA3 S/S and ground terminals damage may occur the pump.

AXB to

Electromechanical Units

ToElectromechanical Unit

AXB to Premier

Unit #2 with Premier

Unit #1

with AXB Board Unit #1

with AXB Board

Unit #2

with AXB Board

AXB to AXB

VSSLOSLI OUTIN C C

With pump

wired to

Unit 2

With pump

wired to Unit 1

VSSLOSLI OUTIN C C

With pump

wired to

Unit 1

With pump

wired to

Unit 2

VSSLOSLI OUTIN C C

Shut

Down CC

SL1

In SL1

Out

Figure 6: Loop Pump Linking

Two conductor thermostat wire

from N.O. relay contacts to Magna3

Start/Stop terminals (S/S and ground)

S/S

Two conductor thermostat

wire from terminal block PB1

in heat pump control box to

relay coil (230V coil)

230

VAC

PB1

IMPORTANT:

Must be 230VAC coil

SPST relay

(field supplied) Magna3

Figure 7

NOTE: If more than 2 heat pumps with AXB or Premier controls are loop pump linked, the remaining heat pumps will be daisy chained

together.

MAGNA3 INSULATED PUMPS INSTALLATION MANUAL

Wiring cont.

MAGNA3RELAY Board - The MAGNA3RELAY board is operated from a dry contact closure. The dry contact closure

can either be from the heat pump control accessory relay or from a SPST 230VAC coil relay. Wiring diagrams are shown

below for connecting to the accessory relay (Figure 8) or SPST 230VAC coil relay (Figure 7). Use two-conductor 18AWG

thermostat wire from the heat pump accessory relay to the relay board HP IN and OUT terminals. NOTE: When connecting

to the ABC accessory SW2-4 and SW2-5 must be in the “OFF” position (cycles with compressor).

HP-1 OUT

HP-1 IN

HP-2 OUT

HP-2 IN

HP-3 OUT

HP-3 IN

HP-4 OUT

HP-4 IN

HP-5 OUT

HP-5 IN

ACC NO

ACC COM

OUT

Figure 8: Accessory relay to MAGNA3RELAY board

MAGNA3 INSULATED PUMPS INSTALLATION MANUAL

Wiring cont.

Use two-conductor 18AWG thermostat wire to connect the MAGNA3RELAY dry contacts to the S/S and ground terminals

on the MAGNA3 pump (see figure 9).

Figure 9: MAGNA3RELAY board dry contacts to MAGNA3

24 VAC

DRY CONTACTS

PUMP RELAY

S/S

WARNING: MAKE SURE THAT POWER IS DISCONNECTED BEFORE WIRING PUMP ENABLE RELAY.

PUMP

RELAY

PUMP

RELAY

Not used with

MAGNA3 Pump

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