Johnson Controls AS-CVTPROx00-1 - Manual (Page 4)

4 AS-CVTPROx00- 1 Zone Bus/N2 Bus Interface Converter Installation Instructions
Connecting the CVTPRO Converter to a Controller
with N2 Screw Terminals
To connect the CVTPRO converter to a controller with
screw terminals (Figure 6):
1. Disconnect the three N2 wires from the controller
screw terminals and temporarily isolate the
individual bare wires with insulating tape.
2. Remove the 4-pin N2 socket from the CVTPRO
N2 cable to expose the three wires (Figure 6 and
Figure 7).
3. Connect the exposed N2+ (blue), N2- (white), and
Ref (red) wires from the CVTPRO N2 cable to the
controller screw terminals. Observe proper
polarity.
4. Connect the 6-pin RJ11 phone plug on the
opposite end of the CVTPRO N2 cable to the
CVTPRO converter (Figure 3 and Figure 5).
CVTPRO N2 Cable
3-Pin N2 Plug
cvtunt.cdr
Wire Directly to
Controller Terminals
N2+ (Blue)
N2- (White)
Ref (Red)
Cable to the
6-Pin RJ11 Phone Plug
and CVTPRO Converter
Remove
4-Pin N2
Socket
Figure 6: CVTPRO N2 Connection to Controllers
with Screw Terminals
Connecting the CVTPRO Converter to a Controller
with a N2 Jack
To connect the CVTPRO converter to a controller with
a removable N2 plug:
1. Remove the 3 or 4-pin N2 plug from the controller.
2. Plug the 3-pin plug CVTPRO N2 cable into the
jack on the controller (The Variable Air Volume
Modular Assembly [VMA] has 4-pin jack, and other
N2 controllers have 3-pin jacks). Observe proper
polarity (N2+ is blue, N2- is white, Ref is red).
3. Connect the 6-pin RJ11 phone plug on the
opposite end of the CVTPRO N2 cable to the
CVTPRO converter (Figure 3).
Note: Figure 7 shows the possible connections with
a VMA controller with a removable 4-pin N2 plug.
To scan a N2 Bus:
1 Disconnect the N2 Bus from the N2 master
controller.
2 Remove the N2 plug (with attached N2 wires) from
the controller (4-pin plug on the VMA and 3-pin
plug on other controllers).
3 Connect the 3-pin or 4-pin N2 plug that was
disconnected from the controller in Step 2, to the
4-pin N2 socket on the CVTPRO converter cable.
(See Figure 7.) Observe proper polarity (N2+ is
blue, N2- is white, Ref is red).
4 Connect the 6-pin RJ11 phone plug on the
opposite end of the CVTPRO N2 cable to the
CVTPRO converter (Figure 3 and Figure 5).
N2 REF
N2-
N2+
N2+
N2-
N2 REF
REF N2- N2+ SH
LD
N
2
+ N
2
- R
E
F S
H
L
D
To
Next
N2
Device
To
Next
N2
Device
4-Pin N2 Plug
Unplugged
from the VMA
VMA
4-Pin Jack
CVTVMA
4-Pin N2 Socket on the
CVTPRO N2 Cable
CVTPRO N2 Cable
3-Pin N2 Plug
Cable to the
6-Pin RJ11 Phone Plug
and CVTPRO Converter
Connect these
components
to communicate
with the controller
via the CVTPRO
Converter.
Connect these
components
to scan the N2 Bus
via the CVTPRO
Converter.
Figure 7: CVTPRO N2 Connection to a VMA with a
Removable N2 Plug