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Step 8 — Complete 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 electrical wire connected to unit ground lug in
control compartment, 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: Check all factory and field electrical connections for tight-
ness. Field-supplied wiring shall conform with the limitations of
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 contactor IFC pressure lugs with unit field power
leads.
Field power wires are connected to the unit at line-side pres-
sure lugs on compressor contactor C and TB1 (see wiring dia-
gram label for control box component arrangement) or at
factory-installed option non-fused disconnect switch. Max wire
size is no. 4 AWG (copper only).
NOTE: TEST LEADS — Unit may be equipped with short leads
(pigtails) on the field line connection points on contactor C or
optional disconnect switch. These leads are for factory run-test
purposes only; remove and discard before connecting field power
wires to unit connection points. Make field power connections
directly to line connection pressure lugs only.
WARNING
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. (See Fig. 13.)
Electric
Disconnect
Switch
Fig. 13 — Disconnect Switch and Unit
Copper
Wire Only
Aluminum
Wire
UNITS
WITH
FACTORY-INSTALLED
DISCONNECT
The factory-installed option disconnect switch is located in a
weatherproof enclosure located under the main control box.
The manual switch handle is accessible through an opening in
the access panel.
UNITS WITHOUT FACTORY-INSTALLED NON-FUSED
DISCONNECT
When installing units, provide a disconnect switch per NEC
(National Electrical Code) of adequate size. Disconnect sizing
data is provided on the unit informative plate. Locate on unit
cabinet or within sight of the unit per national or local codes.
Do not cover unit informative plate if mounting the disconnect
on the unit cabinet.
ALL UNITS
All field wiring must comply with NEC and all local codes.
Size wire based on MCA (Minimum Circuit Amps) on the unit
informative plate. See Fig. 14 for power wiring connections to
the unit contactor and terminal block and equipment ground.
Units Without Disconnect Option
Units With Disconnect Option
L1
2
L2
4
L3
6
Disconnect factory test leads; discard.
Fig. 14 — Power Wiring Connections
Provide a ground-fault and short-circuit over-current protection
device (fuse or breaker) per NEC Article 440 (or local codes).
Refer to unit informative data plate for MOCP (Maximum
Over-current Protection) device size.
All units except 208/230-v units are factory wired for the voltage
shown on the nameplate. If the 208/230-v unit is to be connected
to a 208-v power supply, the control transformer must be rewired
by moving the black wire with the 1/4-in. female spade connector
from the 230-v connection and moving it to the 208-v 1/4-in. male
terminal on the primary side of the transformer. Refer to unit label
diagram for line-side information.
Affix the crankcase heater warning sticker to the unit discon-
nect switch.
15
NON-FUSED
C
TB1
11
13
Disconnect
per
NEC
L1
L2
L3
208/230-3-60
460-3-60
575-3-60
1
Optional
Disconnect
3
Switch
5
Factory
Wiring
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