Gas Heating; Continuous Fan - Bryant 333B-AV-036060-AA-JA Troubleshooting Manual

The ICM blower motor operating mode selections are made on EZ-SELECT airflow control with color-coded jumper wires. Factory jumper
settings have large bold circles marked around pins. (See Fig. 6.) BLUE, RED, and GREEN jumpers are shown at factory settings. Furnaces with
ICM blower motors are not approved for twinning.
I. GAS HEATING
1. The VIOLET wire is factory-connected to 1 of the 4 pins (A, B, C, or D) on Airflow Selector. Pin selection can be checked by noting the
"PIN" marking in lower right-hand corner of furnace rating plate.
2. Gas heating air temperature rise is selected on EZ-SELECT airflow control with RED jumper wire. The selections are MID (midpoint of
temperature rise range marked on rating plate), HI (approximately the high end of rise range), and M-HI (about half-way between MID and
HI). Select rise by moving WHITE connector on RED jumper wire to desired pin position. This setting selects rises for high- and low-gas
heating.
II. COOLING AND HEAT PUMP HEATING
1. Cooling and heat pump selections can be determined from Table 4. Selections are made by moving WHITE connector on appropriately
colored YELLOW jumper wire to desired pin position. Power must be cycled off and then on for Cool Size selection to take effect. Power
need not be cycled off and on for CFM/TON to take effect.
The YELLOW COOL SIZE jumper is used to select airflow CFM to match needed tons for cooling or heat pump system. The BLUE
CFM/TON jumper is used to select a slight adjustment to airflow CFM. The traditional cooling and heat pump airflow is 400 CFM/TON.
An airflow CFM of 350 CFM/TON is used to attain the best efficiency with BDP units. An airflow CFM of 315 CFM/TON is used for
improved dehumidification and/or with undersized ducts. Additional humidity control can be attained by using a humidistat.
As an alternative to selecting 315 CFM per ton for cooling airflow CFM, an active de-humidification mode can be invoked by connecting
a humidistat in series with GREEN wire marked DEHUM connected to the 1/4-in. quick-connect terminal at G on 2-stage furnace control.
The humidistat contacts should open on a rise in humidity. When humidistat contacts open, airflow CFM will be reduced to 80% of selected
airflow CFM, except airflow CFM will not be reduced to less than 280 CFM per ton.
2. The ORANGE jumper wire selects cooling-only (AC) or heat pump heating and cooling, and selects heat pump heating best efficiency (HP
EFFY) or enhanced comfort (HP CMFT). HP EFFY provides the same heating airflow CFM as used for cooling. HP CMFT reduces heating
airflow CFM to 90% of cooling airflow CFM for a higher air temperature rise and better comfort.
III. CONTINUOUS FAN
The GREEN jumper wire selects airflow CFM for continuous fan. LO provides 50% of airflow CFM used for single-speed cooling or 2-speed
cooling. MED provides 65% of this cooling airflow CFM. HI provides 100% of this cooling airflow CFM for continuous fan operation.
NOTE: If HI is selected with a 2-speed cooling or heat pump system, airflow CFM remains at 100% of high-cooling/heating when system is in
low-cooling and heat pump low-heating mode. Continuous fan selection has no effect on gas heating airflow CFM.
TONS (12,000 BTUH)
Unit Size
036060
048080
060100
060120
Operating Mode CFM/TON (Blue Wire)
Single-Speed
G and Y/Y2
(100%)
2-Speed HI
G, Y1, and Y/Y2
(105%)
2-Speed LO
G and Y1
(65%)
* 500 CFM minimum airflow is set for use with electrostatic air cleaner.
† 700 CFM minimum airflow is set for 060 furnace sizes only for use with electrostatic air cleaner.
SETUP PROCEDURES (ICM BLOWER MOTORS)
TABLE 4—COOLING AND HEAT PUMP AIRFLOW SELECTIONS
1-1/2
LO
—
—
400 600
350 525
315 500*
420 630
368 551
331 496
500*
— 500*
500*
2 2-1/2
COOL SIZES (YELLOW WIRE)
M-LO M-HI
— LO M-LO
— —
NOMINAL AIRFLOW (CFM)
800 1000 1200
700 875 1050
630 788
840 1050 1260
735 919 1102
662 827
520 650
500* 569 700†
500* 512 700†
—34—
3 3-1/2 4
HI — —
M-HI HI
LO M-LO M-HI
1400 1600
1225 1400
945 1102 1260
1470 1680
1286 1470
992 1157 1323
780 910 1040
796 910
700† 819
5
—
—
HI
2000
1750
1575
2100
1838
1654
1300
1138
1024