10 | Installation, Operating, and Maintenance Manual
Rev. 05JUL2016
Wiring the Controller (0-10 VDC Output)
WARNING: OPEN THE POWER SUPPLY DISCONNECT SWITCH AND SECURE IT IN AN OPEN
POSITION PRIOR TO PERFORMING ELECTRICAL WORK. VERIFY THAT POWER HAS BEEN
DISCONNECTED PRIOR TO WIRING THE CONTROLLER. FAILING TO SECURE THE ELECTRI-
CAL SUPPLY COULD RESULT IN SERIOUS INJURY OR DEATH. THIS EQUIPMENT SHOULD BE
INSTALLED AND SERVICED BY QUALIFIED PERSONNEL ONLY.
NOTE: The Grundfos Magna3 (or other pump receiving 0-10 VDC output from this controller) must be powered
independently. This controller is not designed to power the pump.
24
VAC
Input
to
P
owe
r
Cont
roll
er
(N
ote
3
)
24VAC
Input
Signal
(N
ote
2)
24VAC
Input
Signal
(N
ote
1)
0-10 VDC Output
Grundfos
D
irec
t
Se
nsor
Inpu
ts
1-
10
VD
C
Input
Ea
rt
h
Ground
Thermistor
Inputs
E
Entering
W
at
er
Therm
(f
rom
loop
)
Leaving
W
at
er
T
he
rm
(to
loop
)
Thermistors
Common
4-
pi
n
conn
ector
from
Grundfos
Flo
w
S
en
so
r
on
e
ith
er
Entering
O
R
Leaving
W
at
er
s
id
e
R C
LWT
EWT
OUT IN REF
PWM
HP IN1 HP IN2
LWT
EWT
C
THERMS
+
-
1-10 DCIN
24VAC INGND
AUXILIARY
L1
L2
N1 N2
OUT
OUT IN
IN
BRN BLK BLU
C
(Note B)
(Note C)
Signal
(IN)
(Note A)
Magna3
(not used)
NOTES:
A.
0-10 VDC Output (labeled “PWM”): Connect 0-10 VDC output from the OUT (BRN) and REF (BLU) terminals
to the pump being controlled (Grundfos Magna3 terminal connections shown above).
B.
HP IN1: Used for pump enable. Left terminal receives 24 VAC input to activate controller based upon con-
troller setting, flow rate or ΔT. Controller will send 0-10 VDC output to the pump to maintain flow rate or
ΔT when enabled. If the application requires constant pump operation (or a minimum flow rate), terminals
HP and IN1 should be jumpered to enable controller/pump continuous operation. IMPORTANT: If using 24
VAC from a nearby heat pump, some heat pump accessory relay contacts are not isolated from the 24 VAC
heat pump transformer, and may create a “dirty” power signal, especially heat pumps with thermostat-
controlled ECM fan motors (symptom includes variable speed pump not shutting off). An isolation relay as
shown in Figure 5 will be required for these situations. Terminal E is 24 VAC; terminal C is common.
C.
24VAC IN: Left terminal connected to “R”; right terminal connected to “C” from external transformer or
heat pump.
Figure 5: Wiring Diagram
for 0-10VDC output
