Step 11 - Make Electrical Connections; Field Power Supply; Units With Factory-Installed Non-Fused Disconnect - Carrier 50KC04 Installation Instructions Manual

The piping for the condensate drain and external trap can be com-
pleted after the unit is in place. See Fig. 20.
MINIMUM PITCH
1˝ (25 mm) PER
BASE RAIL
10´ (3 m) OF LINE
OPEN
VENT
TO ROOF
DRAIN
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. (102 mm) trap is recommended.
Fig. 20 — Condensate Drain Piping Details
All units must have an external trap for condensate drainage. In-
stall a trap at least 4-in. (102 mm) deep and protect against
freeze-up. If drain line is installed downstream from the external
trap, pitch the line away from the unit at 1-in. per 10 ft (25 mm in
3 m) of run. Do not use a pipe size smaller than the unit connec-
tion ( / -in.).
3
4
Step 11 — Make Electrical Connections
WARNING
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal injury or
death.
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 elec-
trical wire connected to unit ground lug in control compart-
ment, or conduit approved for electrical ground when installed
in accordance with NEC; ANSI/NFPA 70, latest edition (in
Canada, Canadian Electrical Code CSA [Canadian Standards
Association] C22.1), and local electrical codes.
NOTE: Field-supplied wiring shall conform with the limitations
of minimum 63°F (33°C) rise.

FIELD POWER SUPPLY

If equipped with optional Powered Convenience Outlet: The pow-
er source leads to the convenience outlet's transformer primary are
not factory-connected. Installer must connect these leads accord-
ing to required operation of the convenience outlet. If an always-
energized convenience outlet operation is desired, 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 desired, connect the source leads to the
load side of the unit disconnect. On a unit without a unit-mounted
disconnect, connect the source leads to compressor contactor C
and indoor fan terminal block (IFTB) pressure lugs with unit field
power leads.
Refer to Fig. 27 for power transformer connections and the dis-
cussion on connecting the convenience outlet on page 16. Field
power wires are connected to the unit at line-side pressure lugs
on compressor contactor C and indoor fan contactor IFC (see
wiring diagram label for control box component arrangement) or
at factory-installed option non-fused disconnect switch. Max
wire size is #2 AWG (copper only, see Fig. 22). See Fig. 21 and
unit label diagram for field power wiring connections.
3˝ (76 mm)
MIN
SEE NOTE
ROOF
CURB
DRAIN PLUG
NOTE: TEST LEADS — Unit may be equipped with short leads
(pigtails) on the field line connection points on contactor C or op-
tional disconnect switch. These leads are for factory run-test pur-
poses only; remove and discard before connecting field power
wires to unit connection points. Make field power connections di-
rectly to line connection pressure lugs only.
Units Without Non-Fused Disconnect Option
C
11 13
Disconnect
per
NEC
208/230-1-60
Units With Non-Fused Disconnect Option
2
L1
4
L2
6
L3
Disconnect factory test leads; discard.
Fig. 21 — Power Wiring Connections
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
Do not connect aluminum wire between disconnect switch and
unit. Use only copper wire.
ELECTRIC
DISCONNECT
SWITCH
Fig. 22 — Disconnect Switch and Unit
UNITS WITH FACTORY-INSTALLED NON-FUSED DIS-
CONNECT
The factory-installed option non-fused disconnect (NFD) switch is
located in a weatherproof enclosure located under the main con-
trol box. The manual switch handle and shaft are shipped in the
disconnect enclosure. Assemble the shaft and handle to the switch
at this point. Discard the factory test leads (see Fig. 21).
Connect field power supply conductors to LINE side terminals
when the switch enclosure cover is removed to attach the handle.
15
C IFC
or
(1-ph
11 13 13
TB
IFM)
Disconnect
per
NEC
L1 L2 L3
208/230-3-60
460-3-60
575-3-60
1
Optional
Factory
3
Disconnect
Wiring
Switch
5
WARNING
COPPER
WIRE ONLY
ALUMINUM
WIRE