Carrier 48TC - Step 12 - Make Electrical Connections

12
not use a pipe size smaller than the unit connection
(
3
/
4
-in.).
Step 12 — Make Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result i n personal
injury or death.
Do not use gas piping as an electrical ground. Unit
cabi net must have an uninterrupted, unbroken
electrical ground to minimize the possibility of
personal injury if an el ectrical fa ult should oc cur. This
ground may consist of elect rical 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
Field Power Supply —
If equi pped with optional Powered Convenie nce Outlet:
The power source le ads to the convenience outlet’s
transformer primary a re not factory c onnected. Installer
must connect these leads according to required operation
of t he convenience outlet. If an always--energized
conveni ence outlet operation is desired, connect the
source leads to the line side of the unit--mounted
disconnec t. (Check with local codes to ensure this method
is acceptable in your area.) If a de --energize via unit
disconnec t switc h opera tion 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
disconnec t, connect the source leads to compressor
contactor C and indoor fan conta ctor IFC pressure lugs
with unit field power leads.
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. f emale spade connector from the 230--v
connec tion and moving it to the 200-v
1
/
4
-in. male
terminal on the primary side of the transformer. Refer to
unit label dia gram for additional information. Field power
wires will be connected line--side pressure lugs on the
power terminal block or at factory--installed option
non--fused disconnect.
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--insta lled option
non--fused disconnect switch. Max wire size is #2 AWG
(copper only).
NOTE: TEST LEADS -- Unit may be equipped with
short leads (pigtails) on the field line connection points on
conta ctor 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 connect ions directly to line
connec tion pressure lugs only.
Units Without Factory--Installed 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 code s. Do not cover unit informat ive
plate if mounting the disconnect on the unit cabinet.
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.
All units --
All field wiring must comply with NEC and all local
codes. Size wire based on MCA (Minimum Circuit Amps)
on the unit informati ve plate. See Fig. 21 for power wiring
connec tions to the unit power terminal block and
equipment ground. Maximum wire size is #2 ga AWG per
pole.
Provide a ground--fault and short--circuit over--current
protection device (fuse or breaker) per NEC Article 440
(or local codes). Refer to unit informati ve data plate for
MOCP (Maximum Over--current Protection) device size.
Disconnect
per
NEC
Disconnect
per
NEC
208/230-1-60
11
13
11
13 13
L1
L2 L3
TB
C
C IFC
or
(1-ph
IFM)
208/230-3-60
460-3-60
375-3-60
575-3-60
Units Without Disconnect Option
Units With Disconnect Option
2
4
6
1
3
5
L1
L2
L3
Optional
Disconnect
Switch
Disconnect factory test leads; discard.
Factory
Wiring
C07494
Fig. 21 -- Power Wiring Connections
All field wiring must comply with the NEC and local
requirements.
48TC