Carrier 48SX024-048 - Manual (Page 31)

Airflow can be changed by changing the lead connec­
tions of the blower motor.
Unit 48SS two- or 3-speed motors (except size 030) are
factory wired for low speed operation. Unit 48SS030 is fac­
tory wired for medium speed. Units 488X024,036, and 048
two- or 3-speed motors are factory wired for low speed;
units 488X030 and 042 are factory wired for medium speed.
For 208/230-v and A.O. 8mith 460-v Blower Motors — The
motor leads are color-coded as follows:
3-8PEED
black = high speed
2-8PEED
black = high speed
low speed red blue = medium speed
red = low speed
To change the speed of the blower motor, remove the fan
motor speed leg lead from the blower relay (BR). This wire
is attached to terminal BM for single-phase and 3-phase units.
To change the speed, remove and replace with lead for de­
sired blower motor speed. Insulate the removed lead to avoid
contact with chassis parts.
The motor leads are color coded
2-8PEED
black = high
blue = jumper
red = low
For 460-v GE Motors
as follows:
3-8PEED
black = high
blue = jumper
orange = medium
red = low
To change the speed of the blower motor, remove fan
motor speed lead from the blower relay (BR) and replace
with the lead for the desired blower motor speed. The mo­
tor speed lead is attached to terminal BM. Insulate removed
lead end to avoid contact with chassis parts. On 3-speed
motors only, connect orange lead to terminal BM of BR.
To select high speed on 460-v GE motors, separate the black
(female QC) from the blue lead (male QC) and connect the
black lead to the BR. Insulate the blue lead to avoid con­
tact with any chassis parts.
Table 6 - Air Delivery (Cfm) at Indicated Temperature Rise and Rated Heating Input
HEATING TEMPERATURE RISE °F
(Btuh) 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
40,000 1389 1111 926 794 694 617 556
- — — - — — —
60,000 2083 1667 1389 1190 1042 926 833 758
— — — — — —
80,000 2778 2222 1852 1587 1389 1235 1111 1010 926 855 794 — — —
100,000 3472 2778 2315 1984 1736 1543 1389 1263 1157 1068 992 926 868 — —
120,000 4167 3333 2778 2381 2083 1852 1667 1515 1389 1282 1190 1111 1042 980 926
140,000 5037 4029 3358 2878 2518 2238 2014 1831 1679 1549 1439 1343 1259 1185 1119
NOTE: Dashed areas do not fall within the approved temperature rise range of the unit.
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