Step 7 - Install Accessories; Step 8 - Complete Electrical Connections - Carrier Gemini 38AU07 Series Installation Instructions Manual

Step 7 — Install Accessories
Accessories requiring modifications to unit wiring should
be completed now. These accessories may include Winter
Start controls and Low Ambient controls. Refer to the in-
structions shipped with the accessory.
Step 8 — Complete Electrical Connections
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause 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
connected to unit ground lug in control compartment, or con-
duit approved for electrical ground when installed in accor-
dance with NEC (National Electrical Code); ANSI/NFPA
70, latest edition (in Canada, Canadian Electrical Code CSA
[Canadian Standards Association] C22.1), and local electri-
cal codes.
NOTE: Check all factory and field electrical connections for
tightness. Field-supplied wiring shall conform with the limita-
tions of 63°F (33°C) rise.
FIELD POWER SUPPLY
If equipped with optional Powered Convenience Outlet: The
power source leads to the convenience outlet's transformer pri-
mary are not factory connected. Installer must connect these
leads according 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 dis-
connect. (Check with local codes to ensure this method is accept-
able in your area.) If a de-energize via unit disconnect switch op-
eration 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 compres-
sor 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
pressure lugs on compressor contactor C and TB1 (see wiring
diagram label for control box component arrangement) or at
factory-installed option non-fused disconnect switch. Max
wire size is #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 con-
nections directly to line connection pressure lugs only.
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or equipment damage.
Do not connect aluminum wire between disconnect switch
and condensing unit. Use only copper wire. (See Fig. 12.)
ELECTRIC
DISCONNECT
SWITCH
Fig. 12 — Disconnect Switch and Unit
UNITS WITH FACTORY-INSTALLED NON-FUSED
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 open-
ing 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. 13 for power wiring con-
nections to the unit contactor and terminal block and equip-
ment ground.
Provide a ground-fault and short-circuit over-current pro-
tection device (fuse or breaker) per NEC Article 440 (or local
codes). Refer to unit informative data plate for MOCP (Maxi-
mum 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
spade connector from the 230-v connection and moving it to the
208-v 1 / -in. male terminal on the primary side of the transform-
4
er. Refer to unit label diagram for line-side information.
Affix the crankcase heater warning sticker to the unit dis-
connect switch.
14
WARNING
COPPER
WIRE ONLY
ALUMINUM
WIRE
1 / -in. female
4