Field Power Supply; Fire Hazard - Carrier WeatherExpert 50LC 07 Series Installation Instructions Manual

FIELD POWER SUPPLY

If equipped with optional powered convenience outlet
The power source leads to the convenience outlet's transformer
primary are not factory connected. Installer must connect these
leads according to required operation of the convenience out-
let. If an always-energized convenience outlet operation is de-
sired, connect the source leads to the line side of the unit-
mounted disconnect. (Check with local codes to ensure this
method is acceptable in your area.) If a de-energize via unit
disconnect switch operation of the convenience outlet is de-
sired, connect the source leads to the load side of the unit dis-
connect. On a unit without a unit-mounted disconnect, connect
the source leads to compressor contactor C and indoor fan ter-
minal block (IFTB) pressure lugs with unit field power leads.
Refer to Fig. 30 for power transformer connections and the dis-
cussion on connecting the convenience outlet on page 20.
Field power wires are connected to the unit at line-side pressure
lugs on compressor contactor C and indoor fan terminal block
(IFTB) (see wiring diagram label for control box component ar-
rangement) or at factory-installed option non-fused disconnect
switch or HACR. Max wire size is #2 ga AWG (copper only) per
pole on contactors. #2 ga AWG per pole on optional disconnect
or HACR and 4/0 AWG per pole on terminal or fuse block on
units with single point box. See Fig. 18 and unit label diagram
for field power wiring connections. See Fig. 19-23 for typical
wiring diagrams.
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
unit. Use only copper wire.
ELECTRIC
DISCONNECT
SWITCH
Fig. 17 — Disconnect Switch and Unit
COPPER
WIRE ONLY
ALUMINUM
WIRE
Units Without Single Point Box, Disconnect or HACR Option
11
L1
208/230-3-60
460-3-60
575-3-60
Units With Disconnect or HACR Option
L1 2
4
L2
L3
6
Ground
(GR)
Disconnect factory test leads; discard.
Units With Electric Heat Option with Single Point Box
and Without Disconnect or HACR Option
L1
L2
L3
Ground (GR)
L1
L2
L3
Ground (GR)
Fig. 18 — Power Wiring Connections
13
C
Equip
12 13
GR Lug
Disconnect
per
NEC
L2 L3 Ground
(GR)
1
Optional
Disconnect
3
Switch
5
Equip GR Lug
Single Point Box
Terminal Block
Equip GR
Lug
— OR —
Single Point Box
Fuse/Terminal Block
Fuse
Fuse
Fuse
Equip GR
Lug
Factory
Wiring
Factory
Wiring
Factory
Wiring