Bryant 664B, Installation Instructions Manual

Page: 9 / 22

9
Table 3 – Required Subcooling
A08406
Step 4 — Indoor Airflow and Airflow Adjust-
ments
NOTE : For cooling operation, the recommended airflow is 350
to 450 cfm for each 12,000 Btuh of rated cooling capacity.
Table 4 shows dry coil air delivery for horizontal discharge units.
Tables 6--8 show pressure drops.
NOTE : Be sure that all supply-- and return--air grilles are open,
free from obstructions, and adjusted properly.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect electrical power to the unit and install lockout
tag before changing blower speed.
!
WARNING
Airflow can be changed by changing the lead connections at the
blower motor. To change motor speeds, reposition wire at fan
motor speed terminals labeled 1--2--3--4 (refer to Fig. 12).
Remove the speed tap connector labeled 1 through 5 on the motor.
While looking at the connector end that is inserted into the motor,
gently pry the locking tab outward and remove the wire from the
connector. Insert the wire into the desired tap until it locks into
place. Be sure new airflow meets the range noted above and
minimum electric heat CFM, if equipped. Refer to Table 2 and 4.
All model sizes are factory wired or rated airflow operation.
A08412
Fig. 12 -- Motor Speed Selection
FOR 208/230V BLOWER MOTORS
The motor lead speed connections are as follows:
SIZE RATED AIRFLOW HIGH AIRFLOW
024 Tap 1 Tap 3
030 Tap 2 Tap 4
036 Tap 1 Tap 3
042 Tap 2 Tap 4
SIZE
RATED AIRFLOW HIGH AIRFLOW
Low
Stage
High
Stage
Low
Stage
High
Stage
048 Tap 1 Tap 3 Tap 2 Tap 4
060 Tap 1 Tap 3 Tap 2 Tap 4
664B