Carrier 39E/ER User Manual download pdf (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

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

100

145T

182T

184T

213T

215T

254T

256T

284T

286T

324T

326T

364T

365T

404T

145T

182T

184T

213T

215T

254T

256T

184

213

215

254U

256U

284U

286U

324U

326U

364U

365U

404U

405U

444U

184

213

215

254U

256U

284U

286U

145T

182T

184T

213T

215T

256T

254T

286T

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

405T

182T

184T

213T

215T

254T

256T

284T

286T

324T

326T

364T

365T

404T

405T

182T

184T

215T

315T

256T

286T

324T

326T

384T

365T

404T

405T

182T

184T

213T

215T

254T

256T

284T

286T

324T

326T

364T

365T

404T

405T

145T

182T

184T

215T

254T

256T

145T

182T

184T

213T

215T

254T

256T

145T

182T

184T

213T

215T

256T

286T

324T

326T

364T

365T

404T

MOTOR VENDOR

R R

Table 14 — Motor Frame Sizes, Totally Enclosed Fan Cooled, 60 Hz

MOTOR

STANDARD

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

145T 145T 184 184

145T

182T •182T

182T 182T

145T P145T

145T

P145T

182T

182T 213

184

182T 182T

184T

182T F182T

182T

F182T

184T 184T 215 213

184T 184T

215T

184T F184T

184T

F184T

213T 213T 254U 215 215T 215T

254T 254T

213T P213T

213T F213T

215T 215T 256U

254U

215T 215T

256T 254T

256T

215T F215T

215T

F215T

254T

284U

256U

256T 256T

284T 284T

254T FG254T

254T FD254T

256T

286U

284T 284T

286T 286T

286T

256T FD2561

256T

FD256T

284T 324U

324U

286T 286T

324T 324T

324T

284T 284T

284TS 284TS

286T

—

326U

—

324T 324T

324T

326T

324T

326T

286T

286TS 286TS

324T

—

364U

—

324T

326T

364T 364T 364T

324T

324TS 324TS

326T

—

365U

—

326T 364T

364T 365T 364T 365T

326T 326T

326TS 326TS

364T

—

405U

—

364T 365T

365T

404T 365T 404T

364T

364TS 364TS

365T

—

444U

—

365T 404T

404T 405T

365T 365T

365TS 365TS

100

405T

—

445U

—

405T 444T

444T 444T

405T

405TS 405TS

MOTOR VENDOR

C R C

C R

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

1 2 ... 9 10 11 12 13 14 15

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