United Technologies Carrier Weathermaker 48A2, Controls, Start-Up, Operation, Service, And Troubleshooting

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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 Lim-
itations table will not result in nuisance tripping or premature motor fail-
ures. Unit warranty will not be affected.
2. All motors comply with Energy Policy Act (EPACT) Standards effective
October 24, 1997.
Table 28 — Air Quantity Limits (48A2,A3,A4,A5) SAV at 100% speed
LEGEND NOTE: Variable air volume units will operate down to 70 cfm/ton in Cooling
mode. Performance at 70 cfm/ton is limited to unloaded operation and may be
also limited by edb (entering dry bulb) and ewb (entering wet bulb) conditions
and Humidi-MiZer operation.
HIGH-EFFICIENCY MOTORS
Nominal Maximum Maximum Amps
Maximum
Watts
Maximum
Efficiency
Bhp BkW Bhp BkW 230 v 460 v 575 v
5 3.73 5.9 4.40 15.0 7.9 6.0 5,030 87.5
7.5 5.6
8.7 6.49 23.5 — — 7,717 84.1
9.5 7.09 — 12.0 10.0 8,008 88.5
10 7.46
10.2 7.61 31.0 — — 9,502 89.5
11.8 8.80 — 15.0 12.0 9,836 89.5
15 11.19
15.3 11.41 46.0 — — 12,543 91.0
18.0 13.43 — 22.0 19.0 14,756 91.0
20 14.92
22.4 16.71 60.0 — — 18,363 91.0
23.4 17.46 — 28.7 23.0 19,183 91.0
25 18.65
28.9 21.56 73.0 — — 23,511 91.7
29.4 21.93 — 37.4 28.4 23,918 91.7
30 22.38
35.6 26.56 91.0 — — 28,742 92.4
34.7 25.89 — 43.8 36.3 28,015 92.4
40 29.84 42.0 31.33 110.0 55.0 43.8 33,690 93.0
PREMIUM-EFFICIENCY MOTORS
Nominal Maximum Maximum Amps
Maximum
Watts
Maximum
Efficiency
Bhp BkW Bhp BkW 230 v 460 v
5 3.73 5.9 4.40 15.8 7.9 4,918 89.5
7.5 5.6
8.7 6.49 23.5 — 7,078 91.7
9.5 7.09 — 12.0 7,728 91.7
10 7.46
10.2 7.61 30.0 — 8,298 91.0
11.8 8.80 — 15.0 9,600 91.7
15 11.19
15.3 11.41 46.0 — 12,273 91.7
18.0 13.43 — 22.0 14,439 93.0
20 14.92
22.4 16.71 59.0 — 17,853 93.0
23.4 17.46 — 28.7 18,650 93.6
25 18.65
28.9 21.56 73.0 — 23,034 93.6
29.4 21.93 — 36.3 23,432 93.6
30 22.38
35.6 26.56 82.6 — 28,374 93.6
34.7 25.89 — 41.7 27,656 93.6
40 29.84 42.0 31.33 110.0 55.0 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