Johnson Controls Metasys N2 User Manual

Network Communications—N2 Communications Bus
43
Notes:
For surge protector's hard ground (HG), use 12 AWG stranded wire, 4.57 m (15 ft) maximum length.
Soft ground (SG) the N2 Bus shield within one inch of entering the enclosure with a 560-1000 pF capacitor.
Make sure wires entering surge protector's enclosure are not close to wires leaving the enclosure.
SURGE3
AHU/LCP/UNT/VAV - Shielded N2 Bus
Metal Enclosure
Building One
2
4
6
8
10
1
3
5
7
9
Surge
Protector
Protected Unprotected
ASC
N2+
N2-
REF
REF
N2-
N2+
HRD GRD
NCM
HG
ASC
HG
Metal Enclosure
ASC
HG
Building Two
2
4
6
8
10
1
3
5
7
9
Surge
Protector
REF
N2-
N2+
ProtectedUnprotected
HG
Metal Enclosure
HG
N2 Bus
+
-
R
REF
N2-
N2+
N2 Bus N2 Bus N2 Bus
+
-
R
+
-
R
+
-
R
SG
S SSS
SG
Metal Enclosure
SG
HG
Figure 26: Installing Surge Protector for AHU/LCP/UNT/VAV

Johnson Controls Metasys N2 Specifications

General

Brand	Johnson Controls
Model	Metasys N2
Category	Cables and connectors
Language	English