Specifications
Table Of Contents
- Introduction
- Installation Procedures
- Commissioning Procedures
- Troubleshooting Procedures
- Overview
- Checking for Good Wire Runs
- Checking for Proper Termination
- Checking the End-of-Line Device Settings
- Checking for Proper Channel Selection
- Checking the N2 Device
- Checking the Number of Defined N2€Devices
- Checking the Length of N2€Bus
- Checking for “T” or “Y” Connections
- Checking for a Ground Loop
- Checking the Repeater
- Checking the Surge Protector
- Checking the Communication Terminal Board
- Checking Communication Faults
- Ordering Instructions
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