The following color code is recommended:
SIGNAL | CCN BUS CONDUCTOR | COMM1 PLUG |
TYPE | INSULATION COLOR | PIN NO. |
1 | RED | 1 |
GROUND | WHITE | 2 |
2 | BLACK | 3 |
NOTE: If a cable with a different color scheme is selec- ted, a similar color code should be adopted for the entire network.
At each system element, the shields of its communication bus cables must be tied together. If the communication bus is entirely within one building, the resulting continuous shield must be connected to a ground at one point only. If the communication bus cable exits from one building and enters another, the shields must be connected to grounds at the lightning suppressor in each building where the cable enters or exits the building (one point per building only).
To connect the unit to the network:
1.Turn off power to the control box.
2.Cut the CCN wire and strip the ends of the red (1), white (ground) and black (2) conductors. (If a different net- work color scheme is used, substitute appropriate colors.)
3.Remove the
a.Insert and secure the red (1) wire to terminal 1 of the
b.Insert and secure the white (ground) wire to terminal 2 of the
c.Insert and secure the black (2) wire to terminal 3 of the
4.Insert the plug into the existing
IMPORTANT: A shorted CCN bus cable will pre- vent some routines from running and may prevent unit from starting. If abnormal conditions occur, un- plug the connector. If conditions return to normal, check CCN connector, and run new cable if nec- essary. A short in one section of the bus can cause problems with all system elements on the bus.
| LEGEND |
CCN | Ð Carrier Comfort Network |
COM | Ð Common |
COMM | Ð Communications |
GND | Ð Ground |
RJ11 PLUG WIRING Ð Units on the CCN can be moni- tored from the space at the sensor through the RJ11 con- nector, if desired. To wire the RJ11 connector into the CCN (Fig. 30):
IMPORTANT: The cable selected for the RJ11 con- nector wiring MUST be identical to the CCN com- munication bus wire used for the entire network. Re- fer to Table 7 for acceptable wiring.
1.Cut the CCN wire and strip ends of the red (1), white (ground), and black (2) conductors. (If another wire color scheme is used, strip ends of appropriate wires.)
2.Insert and secure the red (1) wire to pin J2
3.Insert and secure the white (ground) wire to pin J3
4.Insert and secure the black (2) wire to pin J5
5.Connect the other end of the communication bus cable to the remainder of the CCN communication bus at the COMM1 plug located on the fuse and control circuit breaker bracket in the unit main control box.
Air Pressure Tubing Ð Before options such as supply fan VFD and modulating power exhaust can operate prop- erly, the pneumatic tubes for pressure sensing must be in- stalled. The recommended
The tubing must be run from the appropriate location in the building to the auxiliary control box in the unit. Figures 31 and 32 show the location and layout of the auxiliary control box in the 48/50MP unit. Figure 33 shows the connection locations for the tubing on the duct pressure (DP) controller for the VFD on the supply fan and on the building pressure (BP) controller for the VFD on the modu- lating power exhaust fan.
The tubing for the duct pressure control (DP) should sample supply duct pressure about 2¤3 of the way out from the unit in the main trunk duct. The tubing for the building pressure control (BP) should sample building pressure in the area near the entrance lobby so that location is controlled as closely to design pressures as possible.
*Constant volume applications only.
Fig. 30 Ð Space Sensor to Communication Bus Wiring
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