Carrier 50PG03-07 installation instructions Field Power Wiring Connections

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage.

The correct power phasing is critical to the operation of the scroll compressors. An incorrect phasing will result in an

Set heat anticipator settings as follows:

VOLTAGE	Stage 1	STAGE 1 AND 2
	(W1) ON	(W1 AND W2) ON
All	0.2	0.4

Settings may be changed slightly to provide a greater degree of comfort for a particular installation.

alarm being generated and compressor operation lockout. Should this occur, power phase correction must be made to the incoming power. Damage to compressor could result.

!WARNING

ELECTRICAL SHOCK HAZARD

DISCONNECT PER NEC

FIELDFACTOR

POWERPOWER

WIRINGWIRING

C.A1

11 21

12 22

13 23

07

Failure to follow this warning could result in personal injury or death.

Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with NEC; ANSI (American National Standards Institute)/NFPA (National Fire Protection Association), latest edition, and local electrical codes.

Field wiring must conform to temperature limitations for type “T” wire. All field wiring must comply with NEC and local requirements.

Operating voltage to compressor must be within voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2%.

Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components.

Field Control Wiring (Units Without Optional

Humidi-MiZertAdaptive Dehumidification System)

Unit can be controlled with either a Carrier-approved accessory thermostat or a Carrier-approved space temperature sensor. Install thermostat according to the installation instructions included with accessory. Locate thermostat assembly or space temperature sensor on a solid interior wall in the conditioned space to sense average temperature.

Route thermostat or space temperature sensor cable or equivalent single leads of colored wire from subbase terminals through conduit into unit to low-voltage connections as shown on unit label wiring diagram and in Fig. 9 or 10.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American Wire Gauge) insulated wire (35_C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35_C minimum). For over 75 ft, use no. 14 AWG insulated wire (35_C Minimum). All wire larger than no. 18 AWG cannot be directly connected at the thermostat and will require a junction box and splice at the thermostat.

EQUIP GND

LEGEND

C.A1 -- Compressor Contactor (A1)

EQUIP -- Equipment

GND -- Ground

NEC -- National Electrical Code

NOTE: The maximum wire size for C.A1 is 2/0.

C06237

Fig. 8 - Field Power Wiring Connections

THERMOSTAT ASSEMB Y

	REMOVABLE JUMPER
				Y1	Y2					L
		RH	RC			W1	W2	G	C		X
TB1		R		Y1	Y2	W1	W2	G	C		X

ROOFTOP UNIT

C06292

Fig. 9 - Field Control Thermostat Wiring

	T-55 SPT			T-56 SPT
		SEN	SEN	SET
	RED	BLACK	RED
			BLACK
			WHITE
T55	1	2	3	JUMPER
TB1
		ROOFTOP UNIT

C06239

Fig. 10 - Field Control Space Temperature Sensor Wiring

Field Control Wiring (Units With Optional Humidi- MiZert Adaptive Dehumidification System)

Units require temperature control inputs for cooling and heating operation and humidity control inputs for Humidi-MiZer operation.

50PG03--

9