Carrier 33ZCSECTRM Wall Mounted Relative Humidity Sensor, P/N 33AMSENRHS000, Recommended Cables

Fig. 21 — Wall Mounted Relative Humidity Sensor

(P/N 33AMSENRHS000)

7.Strip 1/4-in. of insulation from each conductor and equip each with a 1/4-in. female quick connect terminal.

8.Connect the RED wire to terminal +24v on the control board.

9.Connect the BLACK wire to terminal GND on the control board.

10.Connect the WHITE/CLEAR wire to terminal RH/IAQ on the control board.

11.Connect shield to ground (if shielded wire is used).

→Remote Occupancy Contact — The remote occu- pancy input (J4 pin 2) has the capability to be connected to a normally open or normally closed occupancy dry contact. Wire the dry contact as show in Fig. 23 between J4 Pin 2 and 24 VAC J1 Pin 1. The 24 VAC necessary to supply the ComfortID™ Controller remote occupancy contact input shall be supplied using the existing ComfortID Controller.

Connect the Outputs — Wire the zone controller’s outputs (fan, staged heat, valves) as shown in the applicable wiring diagrams in Fig. 8A-J.

Modulating Baseboard Hydronic Heating — In- stall the water valve on the leaving water end of the baseboad heater. See Fig. 24. Observe the fluid flow direction when mounting the valve. Be sure to properly heat sink the valve and direct the flame away from the actuator and valve body when sweating the valve connections. Install the leaving water tem- perature sensor (33ZCSENCHG) on the hydronic heating coil as shown. The sensor accommodates nominal copper pipe from 1/2 to 1-in. (OD sizes from 5/8 to 1.125 in.). It should be secured to the pipe with the clamp supplied. If piping is larger than 1-in. nominal size, a field-supplied clamp must be used. Use fiberglass pipe insulation to insulate the sensor assembly.

Refer to Fig. 8C and 8H to wire the modulating water valve and the sensor to the zone controller. Connect the leaving water temperature sensor to the controller using the wiring connec- tions shown for the SAT sensor. (NOTE: The leaving water temperature sensor replaces the SAT sensor in this application.) Use 18 or 20 AWG wire for all connections. The water valve actuator housing may be used as a junction box if the leaving water temperature sensor cable is not long enough and the sen- sor cable must be extended to reach the controller.

For modulating hydronic heating applications, the default configuration must be changed to properly control the valve.

801 26

Refer to the service configuration table and set the Heating Loop parameters as follows:

Proportional Gain = 20.0 Integral Gain = 0.5 Derivative Gain = 0.0 Start Value = 102.0

Also, set the Ducted Heat decision to YES and set the Max- imum Duct Temperature decision equal to the design (maxi- mum) boiler water temperature minus 20 degrees, but not greater than 200 degrees F.

Connect the CCN Communication Bus — The zone controllers connect to the bus in a daisy chain arrange- ment. The zone controller may be installed on a primary CCN bus or on a secondary bus from the primary CCN bus. Con- necting to a secondary bus is recommended.

At 9,600 baud, the number of controllers is limited to 128 zones maximum, with a limit of 8 systems (Linkage Coordina- tor configured for at least 2 zones). Bus length may not exceed 4000-ft, with no more than 60 devices on any 1000-ft section. Optically isolated RS-485 repeaters are required every 1000 ft.

At 19,200 and 38,400 baud, the number of controllers is limited to 128 maximum, with no limit on the number of Linkage Coordinators. Bus length may not exceed 1000 ft.

The first zone controller in a network connects directly to the bridge and the others are wired sequentially in a daisy chain fashion. Refer to Fig. 25 for an illustration of CCN Communi- cation Bus wiring.

The CCN Communication Bus also connects to the zone controller space temperature sensor. Refer to the Install the Sensors section for sensor wiring instructions.

COMMUNICATION BUS WIRE SPECIFICATIONS — The Carrier Comfort Network (CCN) Communication Bus wiring is field-supplied and field-installed. It consists of shielded three-conductor cable with drain (ground) wire. The cable selected must be identical to the CCN Communication Bus wire used for the entire network. See Table 2 for recom- mended cable.

Table 2 — Recommended Cables

MANUFACTURER	CABLE PART NO.
Alpha	2413 or 5463
American	A22503
Belden	8772
Columbia	02525

NOTE: Conductors and drain wire must be at least 20 AWG (American Wire Gage), stranded, and tinned copper. Individual con- ductors must be insulated with PVC, PVC/nylon, vinyl, teflon, or polyethylene. An aluminum/polyester 100% foil shield and an outer jacket of PVC, PVC/nylon, chrome vinyl, or Teflon with a minimum operating temperature range of –20°C to 60° C is required.

CONNECTION TO THE COMMUNICATION BUS

1.Strip the ends of the red, white, and black conductors of the communication bus cable.

2.Connect one end of the communication bus cable to the bridge communication port labeled COMM2 (if connecting on a secondary bus).

When connecting the communication bus cable, a color code system for the entire network is recom- mended to simplify installation and checkout. See Table 3 for the recommended color code.

Table 3 — Color Code Recommendations

SIGNAL TYPE	CCN BUS WIRE	PLUG PIN
	COLOR	NUMBER
+	Red	1
Ground	White	2
–	Black	3