Cooling F
ans
E-136
ORIENTAL MOTOR GENERAL CATALOG
2009/2010
Features E-134
/
Product Line E-134
Control the Number of Constant Speed Fans in Operation
●
The use of two thermostats enables switching the number of
fans being operated to change the air flow in accordance with
temperature.
This helps save energy and reduce noise.
This control method is effective with densely mounted equipment.
●
Application Example
◇
MU1238
AM1-WA1
AM1-XA1
Connection Example
◇
AC Power Supply
■
Temperature of Lower
Set Temperature: 25°C (77°F)
■
Temperature of Upper
Set Temperature: 40°C (104°F)
AM1-WA1
AM1-XA1
ON
OFF
ON
OFF
Time
Upper
No Operation
Inside
Temperature
Operation
Operation
Max. Load of System
40˚C (104˚F)
33˚C (91˚F)
25˚C (77˚F)
18˚C (64˚F)
Lower
No Operation
Notes:
Connect the lead wire to the thermostat as shown in the diagrams, regardless of how many fans are used or of the fan's wire diameter.
●
When connecting multiple fans, always use a terminal block. Don't connect the lead wires of multiple fans directly to the thermostat.
●
When using variable flow fan, don't connect the lead wires for connecting variable resistor directly to the thermostat.
●
Recommended Crimp Terminal
●
Crimp terminal is not included. When crimp terminal is required for connecting, use the crimp terminal shown below.
Phoenix Contact Inc: Al 1-8
Applicable lead wire size: AWG18
MU1238
●
Type Multiple Switching Control
Temperature
Number of
Fans
Input
W
Noise Level
dB (A)
High
40
˚
C
(104
˚
F)
6
84
51
Low
25
˚
C
(77
˚
F)
3
42
48
