Johnson Controls MS2 Installation Bulletin

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 Controls
Product Bulletin, LIT-125502, 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.
© 1999 Johnson Controls, Inc.
Part No. 24-7664-1814, Rev. A
Code No. LIT-125504
I
NSTALLATION
MS2 Two Stage Electronic Control
Pressure Controls Section P
B
ULLETIN
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.
Refer to Rating Table for more information.
➁
➀ C2
C1
➀ ➁
Stage
Stage
Terminal
Binary Input
Not Used
Figure 1: MS2 Panel Mount Wiring
Sensor Sensor Common
Binary Input
+
VO S1 SC
V1 V2 C1
Power Supply Stage
Refer to Rating Table for more information.
Figure 2: MS2 DIN Rail Mount Wiring
FANs 125, 121
Installation Bulletin
Issue Date 1199
Internal to Control
SC
V1 V2 D
VO
+
Power
Supply
Binary /
Sensor
Sensor
Common
Binary
Common
➁
Stage
➁
D CD C2
Internal
to Control
➀
Terminal
Not Used
➀
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