Communications wiring
Fan Coil
CARRIER CORPORATION ©2020
Integration Guide
All rights reserved
13
Johnson N2
To set up the Fan Coil for N2
1
Turn off the power for the Fan Coil by disconnecting power terminals.
2
Using the rotary switches, set a unique address. Set the
Tens
(
10's
) switch to the tens digit of the address,
and set the
Ones
(
1's
) switch to the ones digit.
EXAMPLE
If the controller’s a
ddress is 25, point the arrow on the
Tens
(
10
's) switch to 2 and the arrow on
the
Ones
(
1
's) switch to 5.
10's
1's
1
3
45
2
7
8
9
6
0
1
3
45
2
7
8
9
6
0
3
Set communications selector for
EIA-485
.
4
Set both DIP switches
1
and
2
OFF for 9600 bps.
NOTE
Use the same baud rate for all devices on the network segment.
5
Set the DIP switches
3
ON and
4
OFF
for N2.
The following example is set for 9600 bps and N2.
6
Connect the communications wiring to the
Comm
port in the screw terminals labeled
Net +
,
Net -
, and
Shield
.
Wire specifications
○
A dedicated 22 AWG shielded twisted pair wire (EIA 485)
○
Maximum wire length 2000 feet (610 meters) or 32 nodes
○
Devices should be daisy-chained and not star-wired
○
Attach the drain/shield wire to both ends of the network segment and through every controller
NOTE
Use the same polarity throughout the network segment.
7
Turn on the power for the Fan Coil by connecting power terminals.
Summary of Contents for Fan Coil
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