Set-Up Procedures; Start-Up Procedures - Bryant 333JAV Installation, Start-Up, And Operating Instructions Manual

and without a blower-on delay, BLWM then operates at
high-gas-heat airflow during defrost. For both single-
speed and 2-speed heat pumps, defrost mode is in
high-gas heat only.
c. When furnace control R-W/W1 circuit is opened, the
furnace control CPU begins the normal inducer post-
purge period and the BLWM continues operating for the
blower-off delay period. If the R-G circuit remains
closed, the BLWM reverts to continuous-blower opera-
tion.
III. SET-UP PROCEDURES
The ICM2+ blower motor operating mode selections are made on
the airflow selector (AFS) control with color-coded jumper wires.
The factory jumper settings have large bold circles marked around
the pins. (See Fig. 20.)
NOTE: The ICM2+ furnaces are not approved for twinning.
1. Gas Heating
a. The VIOLET wire is factory connected to 1 of 4 pins: A,
B, C, or D on airflow selector. The factory pin selection
can be checked in Table 8, or by noting PIN marking in
lower right-hand corner of furnace rating plate.
b. The gas heating air temperature rise is selected on
airflow selector (See Fig. 19 and 20.) with RED and
VIOLET jumper wires. The selections are MID, HI, and
MED-HI. MID gives mid point of temperature rise range
marked on rating plate. HI gives high end of temperature
rise range. MID-HI gives temperature rise about halfway
between MID and HI. Select the rise by moving WHITE
connectors on RED and VIOLET jumper wires to
desired pin positions. These settings select the rise for
high and low heat. See Table 8 for air temperature rise.
A B
D7
D6
R2
R1
D5
K1
D8
BLU
HI
AC
400
M-HI
HP
EFFY
M-LO
350
HP
315
CMFT
LO
COOL COOL AC
CFM
S PER HP
I TON
Z
E YEL BLU ORN
Fig. 20—Airflow Selector Control
2. Cooling and Heat Pump Heating
a. The cooling and heat pump selections can be determined
from Tables 9 and 10. The selections are made by
moving the WHITE connector on appropriately colored
jumper wire to desired pin position.
C D
P12
D1
D2
D10
D3
Q1
D4
R3
D11
D9
RED GRN
HI
MID
M-HI
MED
LO
HI
GAS CONTINUOUS FAN
HEAT CFM
TEMP
RISE
RED
GRN
A96061
NOTE: Power must be cycled off and then on for the cool size
selection to take effect. Power need not be cycled off and on for the
CFM/TON to take effect.
b. The YELLOW COOL SIZE jumper is used to select
airflow to match the needed tons for the cooling or heat
pump system. The BLUE CFM/TON jumper is used to
select a slight adjustment to airflow. The traditional
CFM per ton is 400 for cooling and heat pump airflow.
350 CFM per ton is the airflow used to attain best
efficiency with these units. 315 CFM per ton is the
airflow used for improved dehumidification and/or with
undersized ducts. Additional humidity control can be
attained by using a humidistat. (See Set-up Procedures
section, item 4.)
c. The ORANGE jumper wire selects airflow for cooling-
only (AC) or heat pump heating and cooling, and selects
heat pump heating best efficiency (HP EFFY) or en-
hanced comfort (HP CMFT). HP EFFY provides the
same heating airflow as used for cooling. HP CMFT
reduces the heating airflow to 90 percent of the cooling
airflow for a higher air temperature rise and better
comfort.
3. Continuous-fan
The GREEN jumper wire selects airflow CFM for continuous-fan.
LO provides 50 percent of airflow used for single-speed cooling or
2-speed cooling. MED provides 65 percent of cooling airflow. HI
provides 100 percent of cooling airflow for continuous-fan opera-
tion.
NOTE: If HI is selected with a 2-speed cooling or heat pump
system, the airflow will remain at 100 percent of high-
cooling/heating when the system is in low-cool and heat pump
low-heat mode. Continuous-fan selection has no effect on gas-
heating airflow.
4. As an alternative to selecting 315 CFM per ton for cooling
airflow, additional dehumidification on demand can be
achieved with use of a field-supplied humidistat. Remove
the factory-installed GREEN wire marked DEHUM from
the 1/4-in. quick-connect at the G terminal on furnace
control. Connect a humidistat that opens-on-humidity-rise
between the green wire marked DEHUM and the G terminal
on the furnace control. When humidistat contacts open,
airflow will be reduced to 80 percent of selected airflow,
but not less than 280 CFM per ton.
The humidistat may be located in the return air duct or the
conditioned space. Follow instructions included with humidistat.
NOTE: When a humidistat is calling for reduced airflow and the
thermostat is satisfied, blower will not operate on continuous-fan
LOW setting to prevent re-evaporation of condensate at the
evaporator coil. When continuous-fan MED or HI setting is
selected, normal airflow will be reduced to 80 percent.
IV. START-UP PROCEDURES
1. Component test—The furnace features a component test
system to help diagnose a system problem in the case of a
component failure. To initiate the component test proce-
dure, ensure that there are no thermostat inputs to the
control and all time delays have expired. Short the
TWIN/TEST terminal to ground or C
(See Fig. 17.)
NOTE: The component test feature will not operate if the control
is receiving any thermostat signals or until all time delays have
expired. The ICM2+ blower motor speed ramp-up will slightly
delay blower response times.
The component test sequence is as follows:
a. The furnace control checks itself, operates the inducer
motor on low speed for 7 sec and on high speed for 7 sec,
then stops.
—17—
24v for 1 to 4 sec.
OM