24-V Wiring; Accessories - Bryant 355MAV Installation, Start-Up, And Operating Instructions Manual

VOLTS—
UNIT
HERTZ—
SIZE
PHASE
042040 115—60—1
042060 115—60—1
042080 115—60—1
060080 115—60—1
060100 115—60—1
060120 115—60—1
* Permissible limits of voltage range at which unit will operate satisfactorily.
† Unit ampacity = 125 percent of largest operating component's full load amps plus 100 percent of all other potential operating components' (EAC, humidifier, etc.) full load
amps.
‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
** Time-delay type is recommended.
115-V
SINGLE
PHASE
115-V
FIELD-SUPPLIED
DISCONNECT
SWITCH
II. 24-V WIRING
Make field 24-v thermostat connections at 24-v terminal block on
furnace control. Y wire from thermostat MUST be connected to
Y/Y2 terminal on furnace control, as shown in Fig. 28, for proper
ELECTRIC
DISCONNECT
SWITCH
Fig. 29—Disconnect Switch and Furnace
CAUTION: Do not connect aluminum wire between
disconnect switch and furnace. Use only copper wire.
(See Fig. 29.)
TABLE 4—ELECTRICAL DATA
OPERATING
VOLTAGE RANGE
Maximum* Minimum*
127 104
127 104
127 104
127 104
127 104
127 104
NOTE 5
FIVE
WIRE
THREE-WIRE
HEATING
ONLY
W/W1
W2
R
G
AUXILIARY
J-BOX
C
Y/Y2
24-V
FURNACE TERMINAL
BLOCK
CONTROL
CENTER
Fig. 28—Heating and Cooling Application Wiring Diagram
COPPER
WIRE ONLY
ALUMINUM
WIRE
A93033
MAXIMUM MINIMUM
UNIT WIRE
AMPS SIZE
8.9 14
8.9 14
8.9 14
13.8 12
13.8 12
13.8 12
THERMOSTAT
W C R G Y
TERMINALS
NOTE
3
NOTE 1
TWO WIRE
NOTES:
1. Connect Y or Y/Y2 terminal as shown for proper cooling operation.
2. Proper polarity must be maintained for 115-v wiring.
3. Use W2 with 2-stage thermostat when zoning.
4. If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
5. Some thermostats require a "C" terminal connection as shown.
cooling operation. The 24-v terminal block is marked for easy
connection of field wiring. (See Fig. 32.) The 24-v circuit contains
a 3-amp, automotive-type fuse located on furnace control. (See
Fig. 32.) Any electrical shorts of 24-v wiring during installation,
service, or maintenance may cause fuse to blow. If fuse replace-
ment is required, use only a fuse of identical size (3 amp) and type.
The furnace control will flash status code 24 when fuse needs
replacement.
NOTE: Use AWG No. 18 color-coded copper thermostat wire for
lengths up to 100 ft. For wire lengths over 100 ft, use AWG No.
16 wire.
NOTE: For additional thermostat connection diagrams, reference
Fig. 50-57.
III. ACCESSORIES
1. Electronic Air Cleaner (EAC)
The furnace control EAC terminals are energized with 115v
(1.0-amp maximum) during blower operation.
Connect an accessory Electronic Air Cleaner (if used) using
1/4-in. female quick connect terminals to the two male
1/4-in. quick-connect terminals on the control board marked
EAC-1 and EAC-2. The terminals are rated for 115VAC,
1.0 amps maximum and are energized during blower motor
operation. (See Fig. 32.)
—20—
MAXIMUM WIRE MAXIMUM FUSE OR
LENGTH (FT)‡ CKT BKR AMPS**
31
31
31
32
32
32
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-, 208/230-, 460-V WIRING
FIELD-SUPPLIED
DISCONNECT
GND
GND
GND
GND
CONDENSING
UNIT
15
15
15
20
20
20
208/230- OR
460-V
THREE PHASE
208/230-V
SINGLE
PHASE
A98325