Carrier 50EW, 50EJ Make Outdoor-Air Inlet Adjustments, CCN Connection Approved Shielded Cables

NOTE: On units running Version 1.0 of the unit control software, the remote start/ stop switch is connected to R and Y1.

Fig. 16 Ð Field Control Thermostat Wiring

NOTE: Sensor part numbers are as follows:

T55 Ð HH51BX001

T56 Ð HH51BX004

T57 Ð CEC01215303-01

Fig. 17 Ð Field Control Temperature

Sensor Wiring

Remote Field Control (Units Running Version 2.0 of Unit Control Software) Ð A switch closure across terminals R and W1 on TB-3 will initiate the Occupied mode. This can be done manually as well as through a ®eld-supplied timeclock.

Service Tool, Building Supervisor, and Comfort Works Ð Access to the control board can be achieved through the ter- minal marked CCN via a 3-wire bus.

IMPORTANT: Default bus address is 0. Default ele- ment number is 1. Refer to CCN literature for infor- mation on network addressing or changing CCN com- munication defaults.

Carrier Comfort Network Interface Ð The 50E units can be connected to the CCN. The communication bus wiring is sup- plied and installed in the ®eld. Wiring consists of shielded, 3-conductor cable with drain wire.

The system elements are connected to the communication bus in a daisy chain arrangement. The positive pin of each system element communication connector must be wired to the positive pins of the system element on either side of it, the negative pins must be wired to the negative pins, and the signal pins must be wired to signal ground pins. Wiring con- nections for CCN should be made at the 3-pin plug (CCN located at the base board. Consult CCN literature for further information.

Conductors and drain wire must be 20 AWG minimum stranded, tinned copper. Individual conductors must be in- sulated with PVC, PVC/nylon, vinyl, Te¯on, or polyethyl- ene. An aluminum/polyester 100% foil shield and an outer jacket of PVC, PVC/nylon, chrome vinyl, or Te¯on with a minimum operating temperature range of −20 C to 60 C (−4 F to 140 F) is required. Table 5 lists cables that meet the requirements.

Table 5 Ð CCN Connection Approved

Shielded Cables

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

IMPORTANT: When connecting the CCN communi- cation bus to a system element, use a color coding sys- tem for the entire network to simplify installation and checkout. See Table 6.

Table 6 Ð Color Code Recommendations

SIGNAL	CCN BUS CONDUCTOR	CCN PLUG
TYPE	INSULATION COLOR	PIN NO.
Positive (+)	RED	1
Ground	WHITE	2
Negative (−)	BLACK	3

NOTE: If a cable with a different color scheme is selected, a similar color code should be adopted for the entire network.

At each system element, the shields of the communica- tion 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 (+), white (ground), and black (−) conductors. (If a different network color scheme is used, substitute appropriate colors.)

3.Remove the 3-pin male plug from the base module in the main control box, and connect the wires as follows:

a.Insert and secure the red (+) wire to terminal 1 of the 3-pin plug.

b.Insert and secure the white (ground) wire to ter- minal 2 of the 3-pin plug.

c.Insert and secure the black (−) wire to terminal 3 of the 3-pin plug.

4.Insert the plug into the existing 3-pin mating connector on the base module in the main control box.

Step 8 Ð Make Outdoor-Air Inlet Adjustments

ECONOMIZER

NOTE: If accessory power exhaust or barometric relief pack- ages are being added to the unit, install power exhaust or barometric relief before installing economizer hoods.

Economizer Hood Assembly Ð The economizer hood is shipped in a package secured to the outside of the unit and must be ®eld-assembled. There are 2 hoods on every unit. The 50EW/EY units are side supply and side return. The re- turn duct limits access to economizer ®lters from below. Fil- ter tracks (mounting angle without tabs) must be installed correctly to allow access to economizer ®lters from each side. Perform the following procedure to assemble the econo- mizer hood.

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