Grundfos MAGNA3 Series Installation Instructions

98624665
GRUNDFOS MAGNA 3 VARIABLE SPEED PUMP WITH LOCHINVAR BOILERS
FOR KNIGHT 400 - 801, FTXL 400 - 850 AND CREST 751- 6001
Installation and Setup Procedure
1. Refer to the installation manual provided by the pump
manufacturer to install the pump. NOTE: The boiler
MUST be installed in the Primary / Secondary piping
configuration. A system supply sensor MUST be installed
in the Primary (building) loop. Refer to the installation
and operation manual provided by the boiler manufacturer
to ensure the proper system piping configuration.
2. Reference FIG. 1 to connect wiring to the boiler's low
voltage control board on the "Boiler Pump Out" terminal:
a) Connect the (+) wire from the boiler to "In"
connection on the pump 0-10V wiring terminal.
b) Connect the (-) wire from the boiler to the ground
terminal on the pump 0-10V wiring terminal.
3. Connect line voltage by supplying it directly to the pump.
For Knight and FTXL Models: Wire the boiler pump dry
contacts located on the boiler's line voltage terminal
directly to the Magna 3 start/stop connection.
For Crest Models: Wire a relay to the 115V boiler pump
connections on the boiler's line voltage terminal. Connect
the relay to the Magna 3 start/stop connection.
This method of line voltage supply allows the pump screen
to stay on even when the boiler is in Standby mode. For
additional information always reference the "Wiring"
section in the boiler installation and operation manual.
Figure 1 Wiring Connections
INSTALLATION INSTRUCTIONS
4. Reference Tables 1A, 1B and 1C on this instruction sheet
to determine the setpoint percentage of the pump.
5. Follow the procedure below to apply the pump setpoint:
a) From the pump Home screen use the arrow keys to
select [Setpoint].
b) Select [OK] to go to the Setpoint screen.
c) Use the arrow keys to assign a setpoint based on the
information provided in FIG. 2, on page 3.
d) Select [OK] to save the setting.
e) Select the [Home] button to return to the Home
screen.
6. The pump is pre-programmed for 0-10V operation, but
the boiler will require setup to control the variable speed
pump. Follow the instructions for variable speed pump
setup in the boiler installation manual.
A
POWER CONNECTION
2000505834_Rev C
DETAIL A
IMG00960