Carrier ZONECC3Z instruction manual Wiring Diagram Selection Chart, System Wiring

FIBROUS

GLASS	FIELD
	SUPPLIED
DUCTWORK
	SCREWS
	ZONE
	DAMPER

2″ TO 3″

A92480

Fig. 6—Rectangular Fibrous Glass Duct Work

1 1/2 ″ TO 2″

INSULATION

A95134

Fig. 7—Insulated Rectangular Fibrous Glass

Duct Work

Step 5—Install Barometric Bypass Damper

NOTE: The barometric bypass damper is a critical part of Carrier 3-Zone System for controlling noise at minimum airflow. A barometric bypass should be installed unless the duct work and indoor unit have been sized for use without a bypass.

The bypass should be installed according to local codes and SMACNA standards. Be sure bypass is properly supported.

For proper installation, refer to Installation Instructions packaged with barometric bypass.

Step 6—Install Leaving Air Temperature (LAT) Sensor

NOTE: The supplied LAT sensor must be installed for normal operation. Heat pump systems may use an optional HPT (heat pump temperature) sensor for added protection. These sensors protect the equipment when leaving air temperatures approach excessive levels.

Locate LAT sensor in main supply trunk after heating and cooling coil and before bypass damper and first branch. The LAT sensor is radiant shielded to prevent heat from affecting correct air tempera- ture.

1.Drill a 1/4-in. hole at location in supply trunk where sensor will be installed.

2.Insert sensor in hole and use as a template to mark the 2 mounting holes.

3.Drill two 1/16-in. holes to accept No. 6 screws through pre-drilled holes in duct temperature sensor back plate.

4.Use 2 No. 6 sheet metal screws to mount duct temperature sensor to unit.

5.Connect sensor to 2-conductor wire using provided wire nuts. (See Fig. 9, 10, or 11 for connection to Carrier 3-Zone System.)

Step 7—Install Heat Pump Temperature (HPT) Sensor

The optional HPT sensor is recommended in all heat pump/fan coil installations. If an optional HPT sensor is not used, the 10K ohm resistor attached to the two HPT terminals on the board must be left in place. The HPT sensor measures the temperature of the air leaving the indoor coil. The sensor is to be installed downstream of the indoor coil but before the electric heaters. It can be installed

through the wall of the fan coil or may be located entirely inside the fan coil near the blower inlet. Anchor firmly in place with cable ties so that it cannot interfere with the blower wheel.

SYSTEM WIRING

Wiring the system is best done in four steps. Thermostats, Equipment, Dampers, and Remainder. The descriptions below and Table 1 will help you choose the correct wiring diagram for your system. Table 1 also shows the proper setting of dipswitches 9 and 10 for each diagram. Based on the equipment, 3-zone control, and thermostat type, select the appropriate wiring diagram. Terminal designations on all the thermostats are those of Carrier thermostats. Other brands may vary somewhat. Wiring diagrams and 3-Zone Control board layouts are located at the end of this Installation Instruction.

Table 1—Wiring Diagram Selection Chart

WIRING DIAGRAM	EQUIPMENT	3-ZONE	STAT	SWITCH 9	SWITCH 10
		TYPE	TYPE
Fig. 10	1-spd. AC,	AC	AC	not present	not present
	1-Stg. heat
Fig. 11	1-spd. AC,	HP/2S	AC	ON	ON
	1 or 2-stg. heat
Fig. 12	1-spd. HP,	HP/2S	HP	OFF	OFF
	1-stg. aux heat
Fig. 13	1-spd. HP,	HP/2S	AC (2 ht)	OFF	ON
	1-stg. aux heat
Fig. 14	2-spd. AC,	HP/2S	2S (AC)	ON	ON
	1 or 2-stg. heat
Fig. 15	2-spd. HP,	HP/2S	2S (HP)	OFF	OFF
	1-stg. aux heat

Fig. 8 - Shows the board layout for the AC Control. Fig. 9 - Shows the board layout for the HP/2S Control.

Fig. 10 - Shows the 3-Zone AC Control wiring. It supports only 1 stage cooling and 1 stage heating.

Fig. 11 - Shows that the 3-Zone HP/2S Control may be used in 1 stage cooling and 1 or 2 stage heating applications. For 2 stage heating, the stat may be a 2 stage heat AC stat or a HP stat converted to AC. (Carrier HP stats can be field converted to 2 stage heat AC stats.)

Fig. 12 - Shows the conventional HP system, using a HP stat. Only single stage auxiliary heat is supported for heat pump systems. Using the HP stat allows control of emergency heat directly from the stat.

Fig. 13 - Is also a HP system, but uses an AC stat with 2 stage heating instead of a HP stat. (Carrier HP stats can be field converted to 2 stage heat AC stats.) Here, emergency heat can only be selected by a switch on the 3-Zone Control.

Fig. 14 - Is a 2 speed AC system and may have 1 or 2 stages of heat. An HP/2S Control and a 2S stat set for AC operation must be used.

Fig. 15 - Is for a 2 speed HP. It requires an HP/2S Control and a 2S stat set for HP operation. Only single stage auxiliary heat is supported for heat pump systems.

Step 1—Wire Thermostats

All zone thermostats are wired identically, so only the Zone 1 thermostat is shown on the wiring diagrams. For physical location of connections on 3-Zone Control refer to Fig. 8 (AC Control) or 9 (HP Control).

Battery or power stealing thermostats may not require the C connection. Refer to thermostat Installation Instructions. Be care- ful not to cross zone numbers.

Step 2—Wire Equipment

Again, from the selected Fig. 10 through 13, make each connection as shown at the indoor and outdoor units and the 3-zone Control.

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