Carrier 39E/ER - Manual (Page 14)

Multi-SpG6d Motors of high efficiency can provide
an even greater savings in operating costs in certain appli­
cations. Typical of these would be an air handler that on
occasion operates at reduced air quantities (e.g., night
air circulation).
Multi-speed motors, either 1/2-speed (1800/900 rpm,
one- or 2-winding) or 2/3-speed (1800/1200 rpm, 2-
winding), show by the fan laws, the following comparison
of low-speed performance to standard speed performance.
Motor/ Fan Speed (N): 0.500 0.667
Air Quantity (N): 0.500 0.667
Static Pressure (N^): 0.250 0.444
Fan Bhp (N3): 0.125 0.296
where N is the speed ratio.
In application, the fan’s performance would be as
shown by its characteristic performance curve (in the Fan
Performance Catalog) at the reduced fan speed and bhp.
Multi-speed motors may be one or 2 frame sizes larger,
several inches longer overall (Сщах)- carry a 50% to
250% price premium over the standard motor. Because of
larger losses (copper, iron and friction), multi-speed
motors can never realize the same reduction in input
power requirements as in bhp (N^), though they show
substantial reductions in full load amps (FLA) at slow
speeds. Properly applied, they can provide large savings
in power costs and a very short payback period. But
exercise caution not to sacrifice equipment performance
for economy.
Demand Charges/Part-Load Start — in the
usual commercial or industrial application, the starting
of the typical standard air-handler motor makes little,
if any difference in the rate that the typical utility charges
for its power. Ordinarily, any starting currents are lost
in the overall power consumed by the facility. If motor
starting currents appear to be a problem, explore the
matter with your Carrier sales representative.
Table 13 — Motor Frame Sizes, Open Drip Proof, 60 Hz
MOTOR
HP
STANDARD
1800
Rpm 3600
Rpm
1800
Rpm 3600
Rpm
1800/900
Rpm
One Winding
1800/900
Rpm
Two Winding
1800/1200
Rpm
Two Winding
3600/1800
Rpm
One Winding
1800 Rpm
High Efficiency
2
3
5
Vk
10
15
20
25
30
40
50
60
75
100
145T
182T
184T
213T
215T
254T
256T
284T
286T
324T
326T
364T
365T
404T
145T
145T
182T
184T
213T
215T
254T
256T
184
213
215
254U
256U
284U
286U
324U
326U
364U
365U
404U
405U
444U
184
184
213
215
254U
256U
284U
286U
145T
182T
184T
213T
215T
256T
254T
286T
286T
326T
326T
365T
404T
405T
145T
182T
184T
213T
215T
254T
256T
284T
286T
324T
326T
364T
365T
404T
182T
184T
215R
254T
256T
284T
286T
324T
326T
364T
365T
404T
404T
405T
182T
184T
213T
215T
254T
256T
284T
286T
324T
326T
364T
365T
404T
405T
182T
184T
215T
315T
256T
256T
286T
324T
326T
384T
365T
404T
404T
405T
182T
184T
213T
215T
254T
256T
284T
286T
324T
326T
364T
365T
404T
405T
145T
145T
182T
184T
215T
215T
254T
256T
145T
145T
182T
184T
213T
215T
254T
256T
145T
182T
184T
213T
215T
256T
256T
286T
286T
324T
326T
364T
365T
404T
MOTOR VENDOR R R R
Table 14 — Motor Frame Sizes, Totally Enclosed Fan Cooled, 60 Hz
MOTOR
HP
1 STANDARD I
1800
Rpm 3600
Rpm
1800
Rpm 3600
Rpm
1800/900
Rpm
1800/900
Rpm
1800/1200
Rpm
1800 Rpm 1 3600 Rpm
One Winding Two Winding Two Winding High Efficiency | High Efficiency
2 145T 145T 184 184 145T 145T 182T •182T 182T 182T 145T P145T 145T P145T
3 182T 182T 213 184 182T 182T 184T 184T 184T 184T 182T F182T 182T F182T
5 184T 184T 215 213 184T 184T 215T 215T 215T 215T 184T F184T 184T F184T
V k 213T 213T 254U 215 215T 215T 254T 254T 254T 254T 213T P213T 213T F213T
10 215T 215T 256U 254U 215T 215T 256T 254T 256T 256T 215T F215T 215T F215T
15 254T 254T 284U 256U 256T 256T 284T 284T 284T 284T 254T FG254T 254T FD254T
20 256T 256T 286U 286U 284T 284T 286T 286T 286T 286T 256T FD2561 256T FD256T
25 284T 324U 324U 286T 286T 324T 324T 324T 324T 284T 284T 284TS 284TS
30 286T — 326U — 324T 324T 324T 326T 324T 326T 286T 286T 286TS 286TS
40 324T
—
364U — 324T 326T 326T 364T 364T 364T 324T 324T 324TS 324TS
50 326T — 365U — 326T 364T 364T 365T 364T 365T 326T 326T 326TS 326TS
60 364T — 405U — 364T 365T 365T 404T 365T 404T 364T 364T 364TS 364TS
75 365T — 444U — 365T 404T 404T 405T 404T 405T 365T 365T 365TS 365TS
100 405T — 445U — 405T 444T 444T 444T 444T 444T 405T 405T 405TS 405TS
MOTOR VENDOR C R C R C R C R R C R C
Legend and Notes (Tables 13 and 14)
All motors In section below shaded area are special
----------------■ ■ ......................................... order, available on quote control
C — Magnetex-Century Electric
R — Reliance
NOTES
1 Motor frame sizes subject to change. Check motor manu­
facturer’s most recent listings before ordering
2 Some of the high-efficiency motors are approximately 2 in,
longer than standard rpm/frame sizes Check Tables 3 and 4
for fan section fit when selecting these motors
14