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V. STEP 5 — MAKE ELECTRICAL CONNECTIONS
A. Field Power Supply
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 transformer must
be rewired by moving the black wire from the 230-v
1
/
4
-in.
male spade terminal on the transformer and connecting it to
the 200-v
1
/
4
-in. male spade terminal on the transformer.
Refer to unit label diagram for additional information. Pig-
tails are provided for field wire connections.
When installing units, provide a disconnect per NEC. Use
copper conductors only when splice connectors are used.
NOTE: When accessory thru-the-bottom connections are
used, refer to the accessory installation instructions for
information on power wiring. Refer to Fig. 7A and 7B for
drilling locations.
All field wiring must comply with NEC and local require-
ments. In Canada, electrical connections must be in accor-
dance with CSA (Canadian Standards Association) C22.1
Canadian Electrical Code Part One.
Install field wiring as follows (see Fig. 8-10):
1. Install conduit through side panel openings between
disconnect and single point box (see Fig. 9 and 10).
2. Install power wires to terminal connections as shown
in Fig. 8.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate (see
Tables 2A-2D). 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 2A and 2B,
Note 2 to determine the percentage of voltage imbalance.
Operation on improper line voltage or excessive phase imbal-
ance constitutes abuse and may cause damage to electrical
components. (Such operation would invalidate any applica-
ble Bryant warranty.)
B. Field Control Wiring
Install a Bryant-approved accessory thermostat assembly
according to installation instructions included with the
accessory. Locate thermostat assembly on a solid wall in the
conditioned space to sense average temperature in accor-
dance with thermostat installation instructions.
Route thermostat cable or equivalent single leads of colored
wire from subbase terminals to low-voltage connections on
unit (shown in Fig. 11) as described in Steps 1-5 below.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,
use no. 16 AWG insulated wire (35 C minimum). For over
75 ft, use no. 14 AWG insulated wire (35 C minimum). All
wire larger than no. 18 AWG cannot be directly connected to
the thermostat and will require a junction box and splice at
the thermostat.
1. If unit is mounted on roof curb and accessory thru-
the-bottom connection is used, route wire through
connector provided in accessory kit through the unit
basepan.
2. Pass control wires through the hole provided on unit
(see connection D, Connection Sizes Table, Fig. 7A
and 7B).
3. Feed wire through the raceway built into the corner
post to the 24-v barrier located on the left side of the
control box. See Fig. 12. The raceway provides the
UL-required (Underwriters’ Laboratories) clearance
between the high-and low-voltage wiring.
4. Connect thermostat wires to screw terminals of low-
voltage terminal board.
5. If unit is to be equipped with electric resistance heat,
ensure thermostat on a call for heat “W” energizes
“G” output. This allows fan operation on a call for
heat.
WARNING: Unit cabinet must have an uninter-
rupted, 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 (National Electrical
Code), ANSI/NFPA (American National Standards
Institute/National Fire Protection Association), latest
edition, and local electrical codes. Failure to follow this
warning could result in the installer being liable for
personal injury of others.
LEGEND
Fig. 8 — Power Wiring Connections
C—Contactor Terminal Block
ConnectionCOMP(S) — Compressor(s)
IFC — Indoor (Evaporator)
Fan Contactor
Splice Connection
NEC — National Electrical Code Field Wiring
TB — Terminal Block Factory Wiring
575-3-60
208/230-3-60
(090-121),
460-3-60
208/230-3-60
(150,151)