Electrical Controls And Wiring - Bryant 333BAV Service And Maintenance Procedures Manual

115-V FIELD-
SUPPLIED
DISCONNECT
BLK BLK
WHT WHT
GND
JUNCTION
BOX
GREEN
DEHUM
NOTE 6
for Single-Stage Thermostats and/or Single-Speed Condensing Units
(8.) Repeat foregoing procedures until each cell in
furnace has been cleaned.
(9.) Using vacuum cleaner, remove residue from each
cell.
(10.) Using vacuum cleaner with soft brush attachment,
clean burner assembly.
(11.) Clean flame sensor with fine steel wool.
(12.) Reinstall cell outlet plates and screws FIRST;
then, reinstall cell inlet plates and burner assem-
bly. Care must be exercised to center the burners
in the cell openings.
8. After cleaning flue openings, clean flue collector. Check
sealant on flue collector to ensure that it has not been
damaged. If new sealant is needed, contact your dealer or
distributor.
9. Replace flue collector assembly, making sure all 8 screws
are secure.
10. Reinstall inducer assembly.
11. Reinstall relief box.
12. Reconnect wires to the following components:
a. Draft safeguard switch.
b. Inducer motor.
c. Pressure switches.
d. Limit overtemperature switch(es).
e. Gas valve.
f. Hot surface ignitor.
g. Flame-sensing electrode.
h. Wiring connectors leading to control.
13. Reinstall vent connector to furnace flue collar. After fully
assembling vent connector to furnace flue collar, securely
fasten vent connector to flue collar with 2 field-supplied,
corrosion-resistant, sheet metal screws located 180 degrees
apart and midway up the collar.
NOTE 2
W C
FIVE
WIRE
THREE-WIRE
HEATING-
ONLY
W2
COM
W/W1
NOTE 1
Y/Y2
R
CONTROL
G
AFS
24-V
Y1
TERMINAL NOTES: 1.
BLOCK
FURNACE
NOTE 5
O
Fig. 7–Heating and Cooling Application Wiring Diagram
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
1-STAGE
THERMOSTAT
Y R G
TERMINALS
CONDENSING
UNIT
NOTE 4
Connect Y/Y2-terminal as shown for proper operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
4. Y1 is not to be connected.
5. Connect O to thermostat-O only for heat pump applications.
6. Field-supplied humidistat for dehumidification in cooling (optional).
14. Replace blower door only.
15. Turn power and gas to ON.
16. Set thermostat and check furnace for proper operation.
17. Verify blower airflow and that airflow rate changes between
heating and cooling.
18. Check for gas leaks.
WARNING: Never use a match or other open flame to
check for gas leaks. Use a soap-and-water solution. A
failure to follow this warning could result in fire, personal
injury, or death.
19. Replace control door.
IV. ELECTRICAL CONTROLS AND WIRING
CAUTION: There may be more than 1 electrical supply
to unit.
The electrical ground and polarity for 115-v wiring must be
maintained properly. Refer to Fig. 7 and 8 for field wiring
information and to Fig.9 for furnace wiring information. If the
polarity is NOT correct, the furnace control will display rapid
flashing on the status LED and prevent heat operation. The control
system also requires an earth ground for proper operation of the
microprocessor and variable-speed motor.
NOTE: Be aware that measurement of current (amperes) and
power (watts) for the ICM2+ variable-speed motor will be accurate
only when the meter provides true root-mean-square (RMS)
measurements.
With power disconnected from unit, check all electrical connec-
tions for tightness. Tighten all screws on electrical connections. If
any smoky or burned connections are noticed, disassemble the
connection, clean all parts and stripped wire, and reassemble
properly and securely. Electrical controls are difficult to check
without proper instrumentation; therefore, reconnect electrical
power to unit and observe unit through 1 complete operating cycle.
—5—
FIELD-SUPPLIED
FUSED DISCONNECT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
GND
A99231