Carrier FV4B - Troubleshooting; If motor turns slowly; If motor does not run

A. If motor turns slowly:
1. Replace panel. Motor may appear to run slowly if access panel is removed.
2. It is normal operation to run noticeably slower if G terminal is not energized in cooling or heat-pump modes.
B. If motor does not run:
Turn off power and check the following:
1. Check 5 amp fuse on Easy Select Board.
2. Check for 24vac on SEC1 and SEC2. If no voltage is present, check transformer.
3. Check all plugs and receptacles for any deformation which could cause loose connections. Be sure plugs are fully seated.
Table 5—FV4B Airflow Delivery (CFM)
FAN
UNIT
SIZE
OUTDOOR
UNIT
CAPACITY
BTUH
ELECTRIC HEATER KW RANGE
0–50–10 0–15 0–20
LO NOM HI LO NOM HI LO NOM HI LO NOM HI
002
18,000 625 625 625 675 675 675 * * * * * *
24,000 650 725 835 * 725 835 875 875 875 * * *
30,000 815 905 1040 * 905 1040 900 900 1040 1100 1100 1100
36,000 980 1085 1250 980 1085 1250 980 1085 1250 1100 1100 1250
003
24,000 675 725 835 875 875 * * * * * * *
30,000 815 905 1040 875 905 1040 1100 1100 1100 * * *
36,000 980 1085 1250 980 1085 1250 1100 1100 1250 1225 1225 1250
42,000 1140 1270 1460 1140 1270 1460 1140 1270 1460 1225 1270 1460
FAN
UNIT
SIZE
OUTDOOR
UNIT
CAPACITY
BTUH
ELECTRIC HEATER KW RANGE
0–10 0–15 0–20 0–30
LO NOM HI LO NOM HI LO NOM HI LO NOM HI
005
30,000 975 975 1040 1100 1100 1100 * * * * * *
36,000 980 1085 1250 1100 1100 1250 1250 1250 1250 * * *
42,000 1140 1270 1460 1140 1270 1460 1250 1270 1460 * * *
48,000 1305 1450 1665 1305 1450 1665 1305 1450 1665 1500 1500 1665
006
36,000 1100 1100 1250 1350 1350 1350 * * * * * *
42,000 1140 1270 1460 1350 1350 1460 1525 1525 1525 * * *
48,000 1305 1450 1665 1350 1450 1665 1525 1525 1665 1750 1750 1750
60,000 1630 1810 2085 1630 1810 2085 1630 1810 2085 1750 1810 2085
* Airflow not recommended for heater/system size.
NOTE: LO, NOM, and HI refer to AC/HP CFM ADJUST selection.
Table 6—FV4B Minimum CFM for Electric Heater Application
FAN
COIL
UNIT
HEAT PUMP
UNIT
SIZE
CFM
HEATER SIZE KW
5 8, 9, 10 15 18, 20 24, 30
002
Heater Only 625 625 725 875 —
018 625 625 —— —
024 650 725 875 ——
030 800 875 875 1040 —
036 970 970 970 1040 —
003
Heater Only 675 700 1050 1050 —
024 675 875 - ——
030 800 875 1100 ——
036 975 975 1100 1225 —
042 1125 1125 1125 1225 —
005
Heater Only 675 700 1050 1050 1400
030 800 875 1100 ——
036 975 975 1100 1225 —
042 1125 1125 1125 1225 —
048 1305 1305 1305 1305 1400
006
Heater Only 1050 1050 1050 1050 1750
036 1100 1100 1350 1350 —
042 1125 1125 1350 1350 —
048 1300 1300 1350 1465 1750
060 1625 1625 1625 1750 1750
NOTES:
1. Heater Only-Air conditioner with electric heater application.
2. These airflows are minimum acceptable airflows as UL listed. Actual airflow delivered will be per airflow delivery chart for Electric Heating Modes.
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