Lochinvar Crest 1.5 Installation Instructions

INSTALLATION INSTRUCTIONS

GRUNDFOS MAGNA 3 VARIABLE SPEED PUMP WITH LOCHINVAR BOILERS

FOR CREST 1.5 - 5.0 AND KNIGHT 400 - 801

INS90011 Rev B

Installation and Setup Procedure 

IMG00960

POWER CONNECTION

DETAIL A

A

Figure 1 Wiring Connections

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. 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 to the pump as shown in the 

“Wiring” section of the boiler installation manual.

4.  Reference Tables 1A and 1B on this instruction sheet to 

determine the setpoint percentage of the pump.

98624665

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 to assign a setpoint based on the 

information provided in FIG. 2, on page 2.

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 set-up to control the variable speed 

pump. Follow the instructions for variable speed pump 

setup in the boiler installation manual.