20
Table 27 — Motor Limitations
LEGEND
NOTES:
1. Extensive motor and electrical testing on the Carrier units has ensured that the
full horsepower range of the motor can be utilized with confidence. Using the
fan motors up to the horsepower ratings shown in the Motor Limitations table
will not result in nuisance tripping or premature motor failures. Unit warranty
will not be affected.
2. All motors comply with Energy Policy Act Standards effective October 24, 1997.
Table 28 — Air Quantity Limits (48A) at 100% speed
LEGEND NOTE: Variable air volume units will operate down to 70 cfm/ton in Cooling mode. Per-
formance at 70 cfm/ton is limited to unloaded operation and may be also limited by
entering dry bulb and entering wet bulb conditions and Humidi-MiZer operation. Oper-
ation at 70cfm/ton is also not guaranteed when Outdoor conditions do not permit the
Condenser fan option selected to maintain head pressure.
Table 29 — Air Quantity Limits (50A)
*Operation at these levels may be limited by entering evaporator air wet bulb temperatures.
PREMIUM-EFFICIENCY MOTORS
Nominal Maximum Maximum Amps
Maximum
Watts
Maximum
Efficiency
Bhp BkW Bhp BkW 230 v 460 v 575 v
53.735.9 4.40 15.8 7.9 5.9 4,918 89.5
10 7.46
10.2 7.61 30.0 — — 8,298 91.0
11.8 8.80 — 15.0 12.0 9,600 91.7
15 11.19
15.3 11.41 46.0 — — 12,273 91.7
18.0 13.43 — 22.0 19.0 14,439 93.0
20 14.92
22.4 16.71 59.0 — — 17,853 93.0
23.4 17.46 — 28.7 23.0 18,650 93.6
25 18.65
28.9 21.56 73.0 — — 23,034 93.6
29.4 21.93 — 36.3 28.4 23,432 93.6
30 22.38
35.6 26.56 82.6 — — 28,374 93.6
34.7 25.89 — 41.7 36.3 27,656 93.6
40 29.84 42.0 31.33 110.0 55.0 43.8 33,156 94.5
Bhp — Brake Horsepower
BkW — Brake Kilowatts
UNIT SIZE
MINIMUM HEATING
AIRFLOW CFM
(Low Heat)
MINIMUM HEATING
AIRFLOW CFM
(High Heat)
MINIMUM COOLING
AIRFLOW (VAV) CFM
AT FULL LOAD
MINIMUM COOLING
AIRFLOW CFM
(CV AND SAV)
MAXIMUM AIRFLOW
CFM
020 5,900 6,100 4,000 6,000 10,000
025 5,900 6,100 5,000 7,500 12,500
027 5,900 6,100 5,400 8,100 13,500
030 5,900 6,100 6,000 9,000 15,000
035 5,900 10,100 7,000 10,500 17,500
040 7,600 10,100 8,000 12,000 20,000
050 7,600 10,100 10,000 15,000 22,500
060 11,000 10,100 12,000 18,000 27,000
CV — Constant Volume
SAV — Staged Air Volume
VAV — Variable Air Volume
UNIT
COOLING ELECTRIC HEAT
Min CFM Max CFM* Min CFM Max CFM
50A2,A3020 6,000 10,000
6,000 15,000
50A4,A5020 4,000 10,000
50A2,A3025 7,500 12,500
50A4,A5025 5,000 12,500
50A2,A4027 8,100 13,500
50A3,A5027 5,400 13,500
50A2,A4030 9,000 15,000
50A3,A5030 6,000 15,000
50A2,A4035 10,500 17,500
50A3,A5035 7,000 17,500
50A2,A4040 12,000 20,000
10,500 20,000
50A3,A5040 8,000 20,000
50A2,A4050 13,500 20,000
50A3,A5050 10,000 20,000
50A2,A4060 18,000 27,000
15,000 27,000
50A3,A5060 12,000 27,000
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