Carrier 50TJ016-028 specifications Make Electrical Connections, Unit Voltage, Gnd, Nec

Fig. 10 — Make Electrical Connections

Step 6 — Make Electrical Connections

FIELD POWER SUPPLY — Unit is factory wired for volt- age shown on nameplate.

When installing units, provide a disconnect, per NEC (National Electrical Code) requirements, of adequate size (Table 2).

All field wiring must comply with NEC and local requirements.

Route power lines through control box access panel or unit basepan (Fig. 4 and 5) to connections as shown on unit wiring diagram and Fig. 11.

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% and the current must be balanced within 10%.

The correct power phasing is critical in the operation of the scroll compressors. An incorrect phasing will cause the compressor to rotate in the wrong direction. This may lead to premature compressor failure.

Use the following formula to determine the percentage of voltage imbalance.

Percentage of Voltage Imbalance

=100 x max voltage deviation from average voltage average voltage

EXAMPLE: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

455 + 464 + 455

Average Voltage =

3

1371

=

3

= 457

Determine maximum deviation from average voltage:

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility com- pany immediately.

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 — Install a Carrier-approved accessory thermostat assembly according to the installation in- structions included with the accessory. Locate thermostat as- sembly on a solid wall in the conditioned space to sense aver- age temperature.

Route thermostat cable or equivalent single leads of no. 18 AWG (American Wire Gage) colored wire from subbase termi- nals through conduit in unit to low-voltage connections as shown on unit label wiring diagram and in Fig. 12.

NOTE: For wire runs up to 50 ft, use no. 18 AWG insulated wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insu- lated 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 to the thermostat and will require a junction box and splice at the thermostat.

Set heat anticipator settings as indicated in Table 3. Settings may be changed slightly to provide a greater degree of comfort for a particular installation.

TB1 MAXIMUM WIRE SIZE

UNIT			VOLTAGE
50TJ		208/230,380	460	575
	All	350 kcmil	2/0	2/0
		LEGEND
EQUIP — Equipment
GND	— Ground
kcmil	— Thousand Circular Mils
NEC	— National Electrical Code
TB	— Terminal Block

Fig. 11 — Field Power Wiring Connections

(AB) 457 – 452 = 5 v (BC) 464 – 457 = 7 v (AC) 457 – 455 = 2 v

Maximum deviation is 7 v. Determine percent voltage imbalance:

Percentage of Voltage Imbalance = 100 x

7

THERMOSTAT ASSEMBLY

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

457

= 1.53%

This amount of phase imbalance is satisfactory as it is be- low the maximum allowable 2%.

RED BLU PNK ORN VIO BLK BRN WHT

UNIT LOW-VOLTAGE CONNECTIONS

Fig. 12 — Field Control Thermostat Wiring

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