© Munters Corporation, August 2021
22
QM1231r10
All wiring should be installed in accordance with National, State, and Local electrical codes. Fans used to
ventilate livestock buildings or other rooms where continuous air movement is essential should be connected to
individual electrical circuits, with a minimum of two circuits per room. For electrical connection requirements, refer
to diagram on motor nameplate and to information enclosed with the Munters environmental control to be used.
Single Phase Fans
: motor overload protection should be provided for each fan. A Circuit Breaker Switch or slow
blow motor type fuses must be used,
See Figure 21A. See form QM1400 for proper size
.
Three Phase Fans
: motor overload protection should be provided for each fan. A three-pole motor starter or slow
blow motor fuses must be used.
See Figure 21B
.
If a frequency drive (inverter) is used, confirm that motors are rated for inverter duty at the voltage used. The
installation of line reactors is recommended to reduce voltage spikes and harmonic distortion. Supplemental
motor overload protection is also recommended.
NOTE
: A safety cut-off switch should be located adjacent to each fan.
Figure 21A
Single Phase - Motor Overload Protection with Disconnect
(SY2000 or Equivalent)
120 or 240 VAC
Power Supply for
Fan
L1 (H)
L2 (N)
G
T1 (H)
T2 (N)
G
120 or 240 VAC
Power Out
to Fan
L1 (H)
L2 (N)
T1 (H)
T2 (N)
KEY:
L1=Line 1
L2=Line 2
L3=Line 3
H=Hot
N=Neutral
G=Ground
NOTE:
Information in parenthesis refers to 120 VAC control.
Three Phase Power
Supply for Fan
L1
L2
G
T1
T2
G
Three Phase
Power Out
to Fan Motor
L1
L2
T1
T2
L3
T3
L3
T3
Figure 21B
Three Phase - Motor Overload Protection with Disconnect
Safety cut-o
ff
switch
Motor Starter
Electrical Wiring
3.
Circuit Breaker Switch
