Install Electrical Connections; High- -Voltage Connections; Special Procedures For 208- -V Operation - Bryant 574B Installation Instructions Manual

7. Flash, weatherproof, and vibration- -isolate all openings in
building structure in accordance with local codes and good
building practices.
Step 10 — INSTALL ELECTRICAL CONNEC-
TIONS
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted, unbroken
electrical ground. This ground may consist of an electrical
wire connected to the unit ground screw in the control
compartment, or conduit approved for electrical ground when
installed in accordance with NEC, ANSI/NFPA American
National Standards Institute/National Fire Protection
Association (latest edition) (in Canada, Canadian Electrical
Code CSA C22.1) and local electrical codes.
CAUTION
!
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution could result in damage to the unit
being installed.
1. Make all electrical connections in accordance with NEC
ANSI/NFPA (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical
connections must be in accordance with CSA standard
C22.1 Canadian Electrical Code Part 1 and applicable
local codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field- -supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3. Be sure that high- -voltage power to unit is within
operating voltage range indicated on unit rating plate. On
3- -phase units, ensure phases are balanced within 2
percent. Consult local power company for correction of
improper voltage and/or phase imbalance.
4. Insulate low- -voltage wires for highest voltage contained
within conduit when low- -voltage control wires are in
same conduit as high- -voltage wires.
5. Do not damage internal components when drilling
through any panel to mount electrical hardware, conduit,
etc.

HIGH- -VOLTAGE CONNECTIONS

The unit must have a separate electrical service with a
field- -supplied, waterproof, disconnect switch mounted at, or
within sight from, the unit. Refer to the unit rating plate for
maximum fuse/circuit breaker size and minimum circuit amps
(ampacity) for wire sizing.
The field- -supplied disconnect switch box may be mounted on the
unit over the high- -voltage inlet hole when the standard power
and low- -voltage entry points are used (See Fig. 2 and 3 for
acceptable location).
See unit wiring label and Fig. 11 for reference when making high
voltage connections. Proceed as follows to complete the high
voltage connections to the unit. Single phase units:
1. Run the high- -voltage (L1, L2) and ground leads into the
control box.
2. Connect ground lead to chassis ground connection.
3. Connect L1 to pressure lug connection 11 of the
compressor contactor.
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
GND
CONTROL BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
SPLICE BOX
LEGEND
Field Control-Voltage Wiring
Field High-Voltage Wiring
Fig. 11 - - High and Control- -Voltage Connections
4. Connect L2 to pressure lug connection 23 of the
compressor contactor.
Three- -phase units:
1. Run the high- -voltage (L1, L2, L3) and ground leads into
the control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the lines
side of the contactor.
4. Connect field L1 to black wire on connection 11 of the
compressor contactor.
5. Connect field wire L2 to yellow wire on connection 13 of
the compressor contactor.
6. Connect field wire L3 to Blue wire from compressor.

SPECIAL PROCEDURES FOR 208- -V OPERATION

WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Make sure the power supply to the unit is switched OFF before
making any wiring changes. With disconnect switch open,
move yellow wire from transformer (3/16 in.) terminal
marked 230 to terminal marked 200. This retaps transformer
to primary voltage of 208 vac.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before making any wiring changes, make sure the gas supply
is switched off first. Then switch off the power supply to the
unit and install lockout tag.
11
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
BLK(DH)
DHUM
YEL(Y)
Y
THERMOSTAT
GRN(G)
(TYPICAL)
G
RED(R)
R
BRN(C)
C
WHI(W1)
W1
C01026