Warning – Carrier 40RU User Manual

Page 19

Power Supply and Wiring -- Check the unit data plate to

ensure that available power supply matches electrical

characteristics of the unit. Provide a disconnect switch

with an integrated lock--out feature of size required to

provide adequate fan motor starting current. See Tables

4--6 for unit electrical data.

ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal

injury or death.
Do not use gas piping as an electrical ground. 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 (National

Electrical Code); ANSI/NFPA 70, latest edition (in

Canada, Canadian Electrical Code CSA [Canadian

Standards Association] C22.1), and local electrical

codes.

WARNING

FIRE HAZARD
Failure to follow this warning could result in intermittent

operation or performance satisfaction.
Do not connect aluminum wire between disconnect

switch and fan coil unit. Use only copper wire.

(See Fig. 15)

WARNING

COPPER

WIRE ONLY

ELECTRIC

DISCONNECT

SWITCH

ALUMINUM

WIRE

A93033

Fig. 15 -- Disconnect Switch and Unit

Install disconnect switch and power wiring in accordance

with all applicable local codes. See Fig. 15--17 and the

unit label diagram. For units with motor sizes less than 5

Hp (3.7 kW), connect power wiring to unit with no. 10

ring terminal. For units with motor sizes of 5 Hp (3.7 kW)

or more, connect power wiring with

--in. ring terminal.

FILTER
ELEMENTS

FILTER
RETAINER
CLIP

FAN SCROLL

CONDENSATE
DRAIN
CONNECTION
(HORIZONTAL)

MOTOR
AND DRIVE

FAN
CONTACTOR
BOX

WIRE
ACCESS

COIL

FAN DRIVE
PULLEY

TXV BULB
ACCESS

REFRIGERANT
PIPING ACCESS

CONDENSATE
DRAIN
CONNNECTION
(VERTICAL)

LEGEND

TXV — Thermostatic Expansion Valve

C10693

Fig. 16 -- Wiring and Service Access

(Side Panel Removed)

The 40RU size 07--16 units that have motors wired for

460--v, 3--ph, 60 Hz operation can be field--converted to

208/230--v, 3--ph, 60 Hz operation. Rewire the motor

according to the diagram plate on the motor. After

reconfiguring the motor, mark the motor specifying 208--v or

230--v operation replacing the 460--v sticker information on

the units’ corner post.

Fan motors are factory--installed on all units. Indoor--fan

contactors are located in the fan contactor box behind the

side access panel (see Fig. 16 and 17). Wire the thermostat

to the 24--v control circuit terminal block located in the

side of the fan contactor control box, according to Fig. 18

or the unit label diagram. If the air handler is part of a

split system, complete the wiring from the condensing

unit to the thermostat shown in Fig. 18.

2 3

2 2

2 1

1 3

1 2

1 1

FAN
CONTACTOR

24V
TERMINAL
BLOCK

POWER
WIRING
KNOCKOUT

C10694

Fig. 17 -- Fan Contactor Box and Terminal Block

(Cover Removed) (Typical)

40RU