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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.
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Application Example
MU1238
AM1-WA1
AM1-XA1
◇
Connection Example
Inside
No Operation
Operation
Temperature
40˚C (104˚F)
33˚C (91˚F)
25˚C (77˚F)
18˚C (64˚F)
ON
Upper
OFF
ON
Lower
OFF
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.
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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.
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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
E-136
ORIENTAL MOTOR GENERAL CATALOG 2009/2010
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MU1238
Type Multiple Switching Control
Number of
Input
Noise Level
Temperature
Fans
W
40˚C
High
6
84
(104˚F)
25˚C
Low
3
42
(77˚F)
AM1-WA1
AM1-XA1
AC Power Supply
■Temperature of Lower
Set Temperature: 25°C (77°F)
■Temperature of Upper
Set Temperature: 40°C (104°F)
Max. Load of System
Operation
No Operation
Time
dB (A)
51
48
Features E-134
/
Product Line E-134
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