Carrier 39E/ER User Manual

HEATING & COOLING

39E/ER Fan Motors and Drives

Application Data

Fan Motors and Drives for Central Station Air-Handling Units

60 Hertz

INTRODUCTION

The same careful attention given to the selection of the fan should be afforded to the selection of the fan motor and drive. It is the purpose of this publication to define the major factors involved in the selection procedures for these most important components

Factory Installed or Field Supplied? — This decision is a very basic and important one. Basic, in that it needs to be made early, in the ordering phase of the job. Important, in that the results of the motor and drive selection directly affect the satisfactory performance and economical operation of the equipment selected.

Limitations — Every fan has limitations relating to maximum speed and shaft horsepower. Refer to Table 1 for maximum fan horsepower and fan speed limits on standard 39E/ER air handlers.

Fixed or Variable? — Fixed drives are recommended for all applications. However, variable pitch drives are often specified because they permit fan speed (thus, sys­ tem air volume) to be easily field adjusted. Unfortunately, this advantage is usually offset by balancing problems inherent in their design that cause vibration and prema­ ture belt wear, especially in the higher horsepower drives.

For	this	reason,	variable pilch drives	with	motors larger
than	25	hp are	not recommended and	are	not available
from the factbrv.

NOTE: In the event that such a field-supplied drive proves unsatisfactory, contact the drive supplier for any additional technical assistance required

Service Factor — Almost all drives are subject to occasional overload, consequently it is good engineering practice to have ample capacity designed into the drive to take care of these overloads. Although higher service factors will extend the belt life, they will also increase the drive loss, resulting in reduced energy efficiency. A reasonable service factor for fans is considered to be 1.2 to 1.5.

Drive Loss — Proper allowance should be made so the motor selected does not run overloaded. The major factors in drive efficiency are the load on the belt and the bending radius of the belt around the pulley. Belt tension, operating temperature and drive alignment also con­ tribute to drive losses. Considering these factors, the drive loss is generally between 2 to 6% of the maximum fan brake horsepower. Using a 3% selection allowance is reasonable.

Motor Speed — Generally, 1800-rpm motors are used on 39E Series air handlers, All factory-supplied standard drives are designed for 1800 rpm, except for some smaller airfoil units that require 3600-rpm motors due to space limitations. Larger motors in certain size units may require an optional (L5) cabinet extension.

Table 2 gives a complete summary of standard motor sizes, limitations, and speeds. Tables 3 dnd 4 give a com­ plete summary of space and sheave limitations of all fan unit sizes with all NEMA standard motors.

Open Drip Proof (ODP) or Totally Enclosed Fan-Cooled (TEFC) Motors(Fig. 1) — ODP motors are recommended. Compared to TEFC motors, ODP motors are less expensive, have a higher service factor and are normally more readily available from vendor stock.

The 39E/ ER motors are mounted in the unit airstream and operate with cool air passing over the motor. This provides additional cooling to windings and motor bear­ ings and increases the life of the motor, thereby reducing the need for a TEFC motor.

The ODP motors have ventilation openings that allow air over and around the motor windings to keep the temperature as low as possible.

The TEFC motors utilize an internal fan to cool the motor windings. They do not have any openings for venti­ lation air.

Totally enclosed air over (TEAO) motors rely on strictly unit airflow to cool the motor windings. They do not have an internal fan or openings for ventilation air.

Voltage — The nominal power system voltage will normally be more than the motor nameplate voltage. NEMA standards are as follows:

Nominal Power System	Motor Nameplate
Voltage	Voltage
208	200
240	230
480	460
600	575

Field-Installed Inverters — High-efficiency motors are recommended whenever an inverter is field installed to control fan speed. High-efficiency motors can handle the extra heat generated much better than standard motors. The projected life of the motor when controlled by an inverter will be improved if a high-efficiency motor is used.

	Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 13	PC201	Catalog No 513-907	PrintedinUSA	Form 39E-15XA	Pg 1	4-89	Replaces: 39E-12XA
Tab 1b

FACTORY-SUPPLIED DTilVES

Factory-Supplied Standard Drives are available for the motors shown in Table 2, in the rpm range defined by the minimum-maximum values given, subject only to the following qualifieations:

1.Variable speed drives are available with a minimum adjustment of ±7% (i.e., from .93 to 1.07) of any rpm that falls within the range.

2.Fixed speed drives are available within ± 2% (i.e., .98 to 1.02) of any specified rpm within the range.

3.The minimum service factor will be 1.4 on all factorysupplied standard drives. (Based on motor hosepower, not brake horsepower. Actual service factor is nor­ mally much higher.)

The factory-supplied standard 39E/ER drives have been selected on the basis of performance, availability and eost. They cover all normal requirements, but may not meet every conceivable application. Non-standard applications should be reexamined closely for possible correetion to a standard applieation.

Standard factory drives are most desirable because of cost effectiveness, optimized performance and timely shipment.

Follow the 5-step factory-supplied drive selection pro­ cedure on page 3 and order by 39E/ ER unit size, fan rpm and type, fixed or variable. Do not use drive package numbers from previous literature. Do included all rele­ vant motor information — hp, voltage, motor rpm, type and frame size.

Factory-Supplied Special Drives are available on special order (quote control) and normally will require extended lead time and additional eost. Consult your Carrier representative for additional information.

Table 1 — Motor Hp/Fati Speed Limitations for Minimum Bearing Life

	MAXIMUM			MAXIMUM FAN SPEED*
UNIT	MOTOR HP*
SIZE	FC	AF	FC	AF	AF Optional
					High-Speed Wheel
08	Tk	10	2000	4335	4983
11	15	15	1600	4067	NA
13	15	15	1300	3161	3633
17	20	20	1100	2858	3285
19	20	25	1100	2547	2997
23	25	25	1200	2255	2653
29	25	30	1000	2079	2446
36	30	40	900	1886	2219
39	30	40	900	1886	2219
48	40	50	770	1611	1928
57	50	75	650	1397	1643
75	—	100	—	1412	1497
90	—	100	—	1334	NA

AF — Airfoil

FC — Forward Curved

NA — Not Available

'Indicates maximum hp and speed that can be used to obtain 200,000 hour average minimum bearing life (B10 life of 40,000 hours)

FIELD-SUPPLIED DRIVES

Field-Supplied Drives are subject to the physical limitations and functional constraints of the motor and air handler. See Fig. I and Tables 3 - 5 . Since technical assistance and support after the sale will be required, choose the supplier with care. Deal with an established supplier of known reputation, and share this booklet with him.

Field Selection Guide

STEP	ACTION	INFORMATION	REFERENCE
1.	Determine fan	Unit size	Fan Performance Catalog,
	performance	Wheel type (FC/AF)	39E-10P, or the Carrier
		Fan speed (rpm)	Electronic Catalog.
		Fan hp
2.	Check performance	Maximum rpm	Table 1
	iimitations	Maximum hp
3.	Check mounting space	Motor type, hp, rpm and frame	Tables 3 and 4
	iimitations	size ^
4.	Determine motor	FI or F2'	Table 6
	mounting designation
5.	Detennine drive type	Variable or fixed	Page 1
6.	Belt center distance	Maximum	Table 5
		Minimum
7.	Determine maximum	Width	Tables 3 and 4
	sheave dimensions	Radius	Fig 1
8.	Determine shaft	Fan	Table 5
	diameters	Motor	Fig 1

FACTORY-SUPPLIED DRIVE SELECTION PROCEDURE

1.Obtain your fan speed and brake horsepower requirements from the fan data in Catalog 39E-10P or from the Carrier Electronic Catalog.

2.Add 3% to the fan brake horsepower to compensate for drive loss.

3.Select motor by horsepower, type, frame size, voltage and motor rpm.

4.Select either fixed or variable pitch drive.

5.Examine the factory available drive speed range on Table 2. If not listed, re-evaluate your selection for possible correction or request a quote control.

All standard applications should be covered in the Table.

Example: Having determined the fan requirements from the 39E-1 PD Catalog Selec­ tion Procedure, select a motor and drive.

Given: 39ED23 with FC fan 12,500 cfm

3.67in. total pressure

1.From the 39E-10P Fan Catalog: 920 rpm

12bhp

2.Allow for drive loss: 12 bhp x 1.03 = 12.36 bhp

3.Select motor per job specifications: 15 hp, ODP, 254T frame, 460/3/60, 1800 rpm

4.Select a variable drive per job specifications.

5.From Table 2, determine the available speed range for factory-supplied standard drive is 671 - 1184 rpm. 920 rpm is a valid selection.

Table 2 — Motor Hp Limitations and Fan Speed Ranges for Factory Supplied Standard Drives

39E/ER	SEE	MOTOR	FRAME			VARIABLE						FIXED
SIZE	LEGEND	HP	SIZE	FC			AF			FC					AF
				Min		Max	Min		Max	Min		Max	Min		Max
		2	145T	935		1217	2135		2457	794		1257	2349		2535
	C	3	145T	—		—	2407		2769	—		—	24SS		r 2333
		3	182T	1004		1456			—	893		1539
	C	5	182T	—		—	2St4		3352	—		—	■ ■2'77-r		[ 3170
08		5	184T	nyb		1825	—			912		1785	—		—
	A	5	184T	—■		—	2914		3352	—		—
													2771		351$
	c	75	184T	—		—	3287		3781:	—		—	. 3752		3984
		7.5	213T	1187		1944	—		—	1113		1785	_		_
	c	10	213T	—		—	—		—	—		—	3752		4310
		2	145T	547		901	1305		1725	543		934	1282		1826
		3	182T	596		1086	1637		2072	592		1162	1640		2158
		5	184T	684		1343	1905		2513	623		1377	1875		2671
11	c	7 5	213T	763		1390	2228		2876	756		1484	2211		3028
		10	213T	—		—	2558		2943	—		—	2542		■ 3095
												1523
		10	215T	1006		1390	■'-- "■			957
	A	10	215T	—		—	—		—	_		___	2542'		■3095
	C	15	215T	—		—	—		—	—		—	2798		3543
	c	15	254T	—		—	—		—	1213		1420	—		3546
	B	15	254T	—		—	—		—	—		—	2800
		2	145T	571		760	1144		1486	578		784	1128		1607
		3	182T	605		902	1381		1769	611		945	1339		1871
		5	184T	627		1280	1572		2157	626		1297	1576		2245
13		7 5	213T	812		1287	1940		2501	703		1275	1924		2635
	c	10	215T	949		1265	—		—	958		1313	2192		2776
		10	215T	—		—	2155		2522	_		___
	c	15	215T	—		—	-'■248:r :'		2831	—		—	2376		3008
	c					—
		15	254T	—			—		—	1137		1313
'						—							■ 23'77		3010
	B	15	254T	—			—		—	—
		3	182T	493		778	1025		1458	480		826	1017		1568
		5	184T	499		1007	1355		1745	497		1070	1344		1840
		75	213T	551		1070	1588		2032	542		1107	1570		2150
17		10	215T	637		1074	1831		2337	641		1088	1809		2478
		15	254T	782		1077	1989		2452	785		1106	2011		2547
	B	20	256T	963		1109	—		—	996		1122
		20	256T	—		—	2297		2643	—		—	2256		2747
	c	20	256T	—		—	2297		2643	—		—	2256		2747
		3	182T	497		TS5~	917		1195	501		774	899		1281
		5	184T	523		1027	1136		1456	511		1004	1124		1539
		75	213T	561		1079	1349		1723	545		1071	1333		1826
		10	215T	612		1082	1544		1968	589		1071	1525		2088
19	B	15	254T	697		1083	—		—	702		1080	1668		2284
		15	254T	—		—	1686		2158	___		___	___		__
						—
	c	15	254T	—			1686		2158	___		___	___
	B,D	20'	256T	873		1080	—		—	913		1101	1921		2339
		20	256T	—		—	1880		2288	—		—	—
	c	25	256T	—		—	2097		2413	—		__
													2126		2488 '
		3	182T	477		618	835		1063	474		677	824		1129
		5	184T	493		778	972		1257	480		826	965		1375
		75	213T	531		924	1161		1480	516		976	1147		1571
23		10	215T	575		1046	1352		1710	568		1116	1353		1783
	c	15	254T	658		1140	1457		1968	671		1184	1481		2029
		20	256T	831		1146	1641		2019	834		1175	1663		2106
	B	20	256T	831		1146	1641		2019	834		1175	1663		2106
	c	25	284T	992		1142	1842		2120	980		1193	1885		2206
	B	25	284T	992		1142	1842		2120	980		1193	1885		2206
		5	184T	393		614	752		1038	390		657	757		1078
		75	213T	414		7(E9	960		1212	410		762	960		1265
		10	215T	456		832	1109		1406	451		885	1111		1464
29	c	15	254T	474		951	—		—	474		1020	___		___
		15	254T	—		—	1244		1621	—		—	1224		1743
	B	15	254T	—		—	1244		1621	—		—	1224		1743
	B,D	20	256T	602		952	—		—	599		1015	___		___
		20	256T	—		—	1393		1767	___		___	1373		1881
		25	284T	726		946	—		—	722		989	___
	B,D	25	284T	—		—	1547		1779	__		__	1525		1856
.	D	30	286T	—		—	—		_	—		—	1655		1938
		5	184T	356		514	681		874	354		547	674		923
		75	213T	377		610	819		1029	369		636	818		1077
		10	215T	404		701	946		1187	392		741	944		1242
36		15	254T	415		835	1057		1359	416		896	1048		1434
		20	256T	502		876	1196		1519	514		906	1197		1576
		25	284T	604		872	1309		1626	591		914	1332		1687
	B	30	286T	—		—	—		—	697		918	1438		1683
		40	324T	—		—	—		—	—		—	1497		1824
	c	40	324T	—		—	—		—	—		—	1497		1824

Table 2 — Motor Hp Limitations and Fan Speed Ranges for Factory Supplied Standard Drives (cent)

39E/ER	SEE MOTOR	FRAME				VARIABLE							FIXED
SIZE	LEGEND	HP	SIZE		FC			AF		FC					AF
				Min		Max	Min		Max	Min		Max		Min		Max
		7 5	213T	406		561	874		1006	425		520		916		1067
		10	215T	464		693	1078		1240	448		633		1053		1130
39		15	254T	504		725	1078		1240	475		763		1053		1293
		20	256T	549		854	1269		1459	539		826		1245		1443
		25	284T	584		805	1334		1534	583		862		1402		1582
		30	286T	—		—	—		—	583		862		1492		1685
		40	324T	—			—		—	—		—		1574		1785
		10	215T	416		478	—		___	381		495		___		___
		15	254T	404		631	987		1135	410		633		958		1109
48		20	256T	436		691	1073		1235	448		711		1065		1248
		25	284T	501		753	1233		1419	475		763		1175		1406
		30	286T	—		—	—		—	503		750		1251		1475
		40	324T	—		—	—		—	516		750		1340		1609
		50	326T	—		—	—		—	—		—		1492		1733
		15	254T	339		488	880		1012	323		397		841		939
		20	256T	371		534	880		1012	361		523		903		1020
		25	284T	389		597	919		1198	381		593		903		1137
57		30	286T	—		—	—		—	408		645		1046		1206
		40	324T	—		—	—		—	408		645		1100		1353
		50	326T	—		—	—		—	486		645		1234		1406
		60	364T	—		—	—		—	—		—		1309		1406
		75	365T	—		—	—		—	—		—		1405		1566
		15	254T	—		—	699		805	___		___		642		753
		20	256T	—		—	777		895	—		—		765		838
		25	284T	—		—	777		895	—		—		806		888
		30	286T	—		—	—		—	—		___		861		955
75		40	324T	—		—	—		—	—		—		953		1082.
		50	326T	—		—
							—		—	—		—		1008		1174
		60	364T	—		—	—		—	—		—		1086		1248
	C	75	365T	—		—	—		—	—		—		1166		1313
		100	404T	—		—	—		—	—		___		1243		1313
	B	100	405T	—		—	—		—	—		—		1231		1313
		15	254T	—		—	584		672	___		___		547		678
		20	256T	—		—	584		672	—		—		664		774
		25	284T	—		—	699		805	—		—		683		840
		30	286T	—		—	—		—	—		—		723		830
		40	324T	—		—	—		—	—		—		763		915
		50	326T	—		—	—		—	—		—		854		991
		60	364T	—		—	—		—	—				907		1069
	c	75	365T	—		—	—		—	—		—		967		1082
		100	404T	—		—	—		—	—		—		1042		1281
	B	100	405T	—		—	—		—	—		—		1042		1281

Motors are 3600 rpm, all others are 1800 rpm

LEGEND

A = TEFC only

B = TEFC only with cabinet extension option L5 (Requires

Quote Controi on sizes 75/90 )

C = ODP only

D = ODP only with cabinet extension option L5

NOTES

1Ali motors are 60 Hz

2See Tabie 1 for iimitations based on bearing iife

3.Standard drives do not fit 2-speed motors A Quote Control is required for a speciai drive when used with 2-speed motors