FANs 125, 121
Temperature Controls Section
A
Installation Bulletin
Issue Date 1199
© 1999 Johnson Controls, Inc.
1
Part No. 24-7664-1725, Rev. A
www.johnsoncontrols.com
Code No. LIT-125209
IMPORTANT:
All MS2 controls are designed for
use
only
as operating controls.
Where an operating control
failure would result in personal
injury or loss of property, it is the
responsibility of the installer to
add devices (safety, limit
controls) or systems (alarm,
supervisory systems) that protect
against, or warn of, control
failure.
Refer to the
MS Series Multi-Stage Electronic
Temperature Controls Product Bulletin, LIT-125198,
for
necessary information on operation and performance
specifications for this product.
M
ounting
The MS2 control is not position-sensitive but should be
mounted for convenient wiring and adjustment.
To mount the DIN Rail Mount version, install the DIN
rail where appropriate. Snap the control onto the rail in
position.
To mount the Panel Mount version, ensure that there is
sufficient space behind the panel. At least
2-3/4 inches (70 mm) are needed. Make a cutout
1-3/16 by 2-13/16 inches (29 by 71 mm). Remove
retaining clip from control. Insert the control into the
hole. Install retaining clip and adjust for tightness.
W
iring
!
WARNING:
Risk of Electrical Shock.
Disconnect power supply before
making electrical connections to
avoid possible electrical shock or
equipment damage.
Follow these wiring guidelines:
All wiring must conform to the National Electric
Code and local regulations.
Make all wiring connections using adequate gauge
copper conductors only. Connectors are rated for
14-22 AWG wiring.
SC
D
V1 V2
Internal to Control
Process
Sensor
Binary
Input
Binary and Sensor Common
Power
Supply
C1
C2
Stage
Stage
Refer to Rating Table for more information.
Terminal Not Used
Figure 1: MS2 Panel Mount Wiring
Internal to Control
Process
Sensor
Binary
Input
Stage
Stage
Power
Supply
V1 V2
CD
C1
SC
C2
S1
D
Sensor Common
Binary
Common
Terminal Not Used
Refer to Rating Table for more information.
Figure 2: MS2 DIN Rail Mount Wiring
I
NSTALLATION
B
ULLETIN
MS2 Two Stage Electronic Temperature Control
