Bryant 664B Indoor Airflow and Airflow Adjust- ments, Required Subcooling, Motor Speed Selection

Table 3 – Required Subcooling

664B

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.

!WARNING

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.

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

	RATED AIRFLOW		HIGH AIRFLOW
SIZE	Low	High	Low	High
	Stage	Stage	Stage	Stage
048	Tap 1	Tap 3	Tap 2	Tap 4
060	Tap 1	Tap 3	Tap 2	Tap 4

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