18
Step 6 — 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
instructions shipped with the accessory.
Step 7 — Complete Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not us e 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 connecte d to unit ground lug
in control compartment, or conduit approved for
electrical ground when installed in accordance with
local electrical codes or in absence of local codes, it is
recommended that the U.S.A. standard ANSI/NFPA
70, National Electrical Code (NEC), be followed.
!
WARNING
NOTE: Check all factory and field electrical connections
for tightness. Field-supplied wiring shall conform with the
limitations of 33C(63F) rise.
Field Power Supply —
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
arrange ment) or at fac tory-installed option non-fused
disconnec t switch. Max wire size is #4 AWG (copper
only).
NOTE: TEST LEADS - Unit may be equipped with short
lea ds (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.
FIRE HAZARD
Failure to follow this warning could cause in personal
injury, death and/or equipment damage.
Do not connect aluminum wire bet we en disconnect
switch and condensing unit. Use only copper wire.
(See Fig. 10.)
!
WARNING
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 10 -- Disconnect Switch and Unit
Units Without Factory-Installed Disconnect —
When installing units, provide a disconnect switch of
adequa te size per local or national wiring code.
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.
Units with Factory-Installed Disconnect —
The factory-installed option disconnect switch is located
in a weatherproof enclosure locat ed under the main
control box. The manual switch handle is accessible
through an opening in the access panel.
All Units —
All field wiring must comp ly with all local cod es . S ize w ire
based on MC A (M in imum Circuit Amp s ) on the un it
informative plate. See Fig. 11 for power wiring connections
to the unit load terminals and equipment ground.
Provide a ground--fault and short--circuit over--current
protection device (fuse or breaker) per local code (or in
absence of local code, is is recommended that U.S.A.
standard, NEC Article 440, be followed). Refer to unit
informative data plate for MOCP (Maximum
Over--current Protection) device size.
All field wiring must comply with the appropriate national
electrical codes and local requirements.
Affix the crankcase he ater warning sticker to the unit
disconnec t switch.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Tables 11 and 12. On 3-phase units, voltages between
phases must be balanced within 2% and the current within
10%. Use the formula shown in the legend for Tables 11
and 12 Note 3 (see page 21) to determine the percent of
voltage imbalance. Operation on improper line voltage or
excessive phase imbalance constitutes abuse and may
cause damage to electric al components. Such operation
would invalidate any applic able Carrier warrant y.
38AU
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