Carrier 48ES---A Instruction Manual download pdf (Page 12)

Single phase units:

1. Run the high-voltage (L1, L2) and ground lead into the

control box.

2. Connect ground lead to chassis ground connection.

3. Locate the black and yellow wires connected to the line side

of the contactor (if equipped).

4. Connect field L1 to black wire on connection 11 of the

compressor contactor.

5. Connect field wire L2 to yellow wire on connection 23 of

the compressor contactor.

Three-phase units:

1. Run the high-voltage (L1, L2, L3) and ground lead into the

control box.

2. Connect ground lead to chassis ground connection.

3. Locate the black and yellow wires connected to the line side

of the contactor (if equipped).

4. Connect field L1 to black wire on connection 11 of the

compressor contactor.

5. Connect field wire L3 to yellow wire on connection 13 of

the compressor contactor.

6. Connect field wire L2 to blue wire from compressor.

Special Procedures for 208-v Operation

ELECTRICALSHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Make sure the power supply to the unit is switched OFF and

install lockout tag. before making any wiring changes. With

disconnect switch open, move black wire from transformer

(3/16 in. [4.8 mm]) terminal marked 230 to terminal marked

208. This retaps transformer to primary voltage of 208 vac.

ELECTRICAL SHOCK FIRE/EXPLOSION HAZARD

Failure to follow this warning could result in personal

injury or death and property damage.

Before making any wiring changes, make sure the gas

supply is switched off first. Then switch off the power

supply to the unit and install lockout tag.

Control Voltage Connections

Do not use any type of power-stealing thermostat. Unit control

problems may result.

Use no. 18 American Wire Gage (AWG) color-coded, insulated

(35°C minimum) wires to make the control voltage connections

between the thermostat and the unit. If the thermostat is located

more than 100 fl (30.5 m) from the unit (as measured along the

control voltage wires), use no. 16 AWG color-coded, insulated

(35 ° C minimum) wires.

Standard Connection

Run the low-voltage leads from the them_ostat, through the inlet

hole, and into unit low-voltage splice box.

Locate six (seven for 3-phase) 18-gage wires leaving control box.

These low-voltage connection leads can be identified by the colors

red, green, yellow, brown, blue, and white (See Fig. 10). A gray

wire is standard on 3-phase units for connection to an economizer.

Ensure the leads are long enough to be routed into the low-voltage

splice box (located below right side of control box). Route leads

through hole in bottom of control box and make low-voltage

connections (See Fig. 10). Secure all cut wires, so that they do not

interfere with operation of unit.

HIGH VOLTAGE

POWER LEADS ._o= -

(SEE UNITWlRING|

LABEL) _ -

3-PHASE SHOWN

1-PHASE USES L._

TWO POWER

LEADS EQUIP GR

CONTROL BOX

LOW-VOLTAGE

POWER LEADS

(SEE UNIT

WIRING LABEL)

O,=

O,,=

O-

O,=

_,O=

FIELD-SUPPLIED

FUSED DISCONNECT

WHTLW_I ).D.

YEL (,,Y)_ ,,_

_2_

RED(R,_ ,,_

2£_cz 9"

B£U4'_)'I>

2_Y_ D

Dnl_

#7g °fAT

SPLICE BOX

A09053

Fig. 10 - High- and Control-Voltage Connections

Heat Anticipator Setting (Electro-Mechanical

Thermostats only)

The room thermostat heat anticipator must be properly adjusted to

ensure proper heating performance. Set the heat anticipator, using

an ammeter between the W and R terminals to determine the exact

required setting.

NOTE: For thermostat selection purposes, use 0.18 amp for the

approximate required setting. Failure to make a proper heat

anticipator adjustment will result in improper operation, discomfort

to the occupants of the conditioned space, and inefficient energy

utilization; however, the required setting may be changed slightly

to provide a greater degree of comfort for a particular installation.

Transformer Protection

The transformer is of the energy-limiting type, however a direct

short will likely blow a secondary fuse. If an overload or short is

present, correct overload condition and check for blown fuse on

Indoor Fan board or Integrated Gas Controller. Replace fuse as

required with correct size and rating.

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Carrier 48ES---A Instruction Manual Page 12

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