Carrier 48KLA - Page 17

INDOOR AIRFLOW AND ADJUSTMENTS
Models 48KHA,KLA end-discharge units have
direct-drive blower motors. All motors are factory-
connected to deliver proper heating and cooling
airflows at normal external static pressures (except
for some 208-v applications).
Table 5 shows heating airflow at various tempera¬
ture rises. Table 6 shows both heating and cooling
airflows at various external static pressures for
Models 48KHA,KLA direct-drive units. Refer to
these tables to determine airflow for system being
installed. See Table 8 for rated cooling and heating
airflows.
NOTE: Be sure all supply- and return-air grilles are
open, free from obstructions and adjusted properly.
NOTE: When operating the 208/230-volt, 3-phase
versions of Models 48KHA048 and 48KHA060 at
208 volts, lead connections of blower motor must
be changed as indicated on unit wiring label to
ensure proper airflow.
Heating and/or cooling airflow of 208/230-v
direct-drive blower motors can be changed by
changing the lead connections of blower motor.
Motor leads are color-coded as follows:
black — high speed
blue — medium speed
red — low speed
NOTE: Some direct-drive blower motors do not
have lead for medium speed. Factory connections
and available optional connections are shown in
Table 6.
-> Table 8 — Rated Cooling and Heating Airflows
MODEL 48-
COOLING :
HEATING
Rated
Airflow
(cfm)*
ESP
(in.wg)
Rated
Airflow
(cfm)*
Maximum
ESP
(in.wg)*
KLA11831OBE
630 0 10 505
0.30
KLA124310BE
800
0 10
505
0 30
KHA02431OBF
800
0 10 947 0 30
KLA130310BE
1000 0 15
462 0 30
KHA03031OBF
1000
0 15
947
0.30
KLA136310BE
1200
0 15
758 0 30
KLA036510CE ;
1200
0 15 758 0 65
KLA03661OCE
1200 0 15
758 0.65
KHA136310BC
1200
0 15
1155 0 30
KHA036510CE
1200
0 15 1155 0 65
KHA03631OBF
1200
0 15 1445 0 30
KHA036510CF
1200
0 15
1445
0 65
KLA142310BE
1400 0 15
695 0 30
KLA042510CE
1400
0 15 695 0 65
KHA04231OBF
1400
0 15
1445
0 30
KHA042510CF
1400
0 15
1445
0 65
KLA148310BE
1600
0 20 925 0 30
KLA04851OCE
1600
0 20 925 0 65
KLA04861OCE
1600
0 20
925
0 65
KHA04831OBF
1600
0 20
1445
0 30
KHA048510CF
1600
0 20
1445
0.65
KLA160310BE
2000 “ 0 20
1155 0 30
KHA06031OBF
2000
0 20
1735 0 30
ESP — External Static Pressure
*Rated in accordance with U S Government D.O.E test pro¬
cedures and/or ARI Standard 210-81
For all units, motor lead connected to heat relay
determines heating speed and resulting airflow; and
motor lead connected to cooling relay determines
the cooling speed and resulting airflow. See unit
wiring label.
To change heating and/or cooling speed, connect
appropriate color-coded lead to appropriate relay.
Be sure to properly insulate any unused motor lead.
See Make Wiring Connections, Special Procedures
for 208-v Operation section for proper procedures to
insulate an unused electrical lead.
When installing a 208- or 230-v direct-drive unit
that is factory-connected for heating and cooling
speeds that are not the same, and same speed for
both heating and cooling is required for a particular
application, connect appropriate color-coded lead
to terminal 2 of cooling relay and connect a field-
supplied jumper between heat relay and terminal 2
of cooling relay. Be sure to properly insulate unused
motor lead(s).
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