Carrier 40RU 25, Manual

Page: 21 / 40

21
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 pro -
vide adequate fan motor starting current. See Tables 9-11 for unit
electrical data.
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.
Connect power wiring with 1/4 in. ring terminal.
Fig. 16 — wiring and Service access
(Side Panel Removed)
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 cir -
cuit terminal block located in the side of the fan contactor control
box, according to Fig. 18 or the unit label diagram. If the air han -
dler is part of a split system, complete the wiring from the con -
densing unit to the thermostat shown in Fig. 18.
Fig. 17 — Fan Contactor Box and Terminal Block
(Cover Removed) (Typical)
WARNING
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 con -
nected 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 oper -
ation or performance satisfaction.
Do not connect aluminum wire between disconnect switch
and fan coil unit. Use only copper wire. (See Fig. 15.)
Copper
Wire Only
Electric
Disconnect
Switch
Aluminum
Wire
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
Connection
(Vertical)
LEGEND
TXV — Thermostatic Expansion Valve
2 3
2 2
2 1
1 3
1 2
1 1
1
0
5
°
C
6
0
0
V
R
J
A
W
Fan
Contactor
24V
Terminal
Block
Power
Wiring
Knockout