Specifications 48ES
Single - Packaged Gas Heating/Electric Cooling Units with Puron® Carrier
(R -410A) Refrigerant Single- And Three -Phase Units
1' 1 -1/2 to 5 Nominal Tons (Sizes 018 -060) Turn to the Experts.
.. CITY Off' TIGARD
• Approved 4.1C4
. Conditionally Approved... ( ]
Product Data See Letter to: Follow...., - [ J
A ,,, hed
Permit Nu i .1, A. _ i AI -,
Single- Packaged ProductActula i o r 4_ " .7 1 1. �! • '
tone refrigerant. By: 'e Date: '1P.111 .4
• 13 SEER
Ar • Up to 81% AFUE
1 I' ' ``� J�� • Facto Installed TXV
401110 �I • Multi -Speed Blower- Standard ,�`1 I. • Direct Spark Ignition t
`�_k4.411II'' 'I'I'jj''I. • Low Sound Levels f 77'5
-4,11 . 0 0 01,0-- -4,...„ 0 .,--
.0 1/6)
�, e , g Ng r 1
A99338 �y ,�,._,
Unit 48ES a i Cs 1 0 �� R Oci �
FEATURES /BENEFITS Z _ Iey L i, , .., OUT ( 4
One -piece heating and cooling units with low sound levels, easy Energy- saving, direct spark ignition saves gasby operating only
i '' installation, low maintenance, and dependable performance. when the room thermostat calls for heating. Standard units are fur -
Puron Environmentally Sound Refrigerant is Carrier's unique niched with natural gas controls. A low -cost field installed kit for
refrigerant designed to help protect the environment. Puron is an propane conversion is available for all units.
HFC refrigerant which does not contain chlorine that can harm the 48ESN units are dedicated Low NOx units designed for Califor-
ozone layer. The most important advantage of Puron refrigerant is nia installations. These models meet the California maximum ox-
that it has not been banned in future air conditioning systems as the ides of nitrogen (NOx) emissions requirement of 40 nanograms/
traditional refrigerant R -22 has been. Puron refrigerant is in service joule or less as shipped from the factory and MUST be installed in
in over 100,000 systems proving highly reliable, environmentally California Air Quality Management Districts where a Low NOx
sound performance. rule exists. Low NOx option is available on single phase models on-
Easy Installation l y .
Factory - assembled package is a compact, fully self- contained, Durable, dependable components Compressors are designed for
combination gas heating/electric cooling unit that is prewired, pre- high efficiency. Each compressor is hermetically sealed against con -
piped, and pre- charged for minimum installation expense. These tamination to help promote longer life and dependable operation.
units are available in a variety of standard and optional heating/ Each compressor also has vibration isolation to provide quieter op-
cooling size combinations with voltage options to meet residential eration. All compressors have internal high pressure and overcur-
and light commercial requirements. Units are lightweight and install rent protection.
easily on a rooftop or at ground level. The high tech composite base Monoport inshot burners produce precise air -to -gas mixture,
eliminates rust problems associated with ground level applications. which provides for clean and efficient combustion. The large mono -
Convertible duct configuration port on the inshot (or injection type) burners seldom, if ever, re-
Unit is designed for easy use in either downflow or horizontal ap- quires cleaning. All gas furnace components are accessible in one
plications. Each unit is easily converted from horizontal to down- compartment.
_ flow with the two standard duct covers. Turbo- tubular' heat exchangers are constructed of aluminized
Efficient operation High - efficiency design offers SEER (Season- steel for corrosion resistance and optimum heat transfer for im
al Energy Efficiency Ratios) of 13.0, and AFUE (Annual Fuel Uti- proved efficiency. The tubular design permits hot gases to make
lization Efficiency) ratings as high as 81 %. multiple passes across the path of the supply air.
tJ
1
OFFICE COPY
ARI* CAPACITIES
COOLING CAPACITIES AND EFFICIENCIES
UNIT NOMINAL STANDARD NET COOLING EER** SEERt
48ES TONS CFM CAPACITIES (Btuh)
018 1-1/2 650 18,000 10.7 13.0
r, 024 2 800 23,000 14.2 13.2
030 I 2 -1/2 1000 28,000 11.2 13.2
_
036 3 1200 34,000 11.2 13.5
042 3 -1/2 1400 40,000 10.9 13.0
.y 048 4 1600 46,500 10.9 13.2
060 5 1750 56,500 11.0 13.2
LEGEND Notes:
dB -Sound Levels (decibels) 1. Ratings are net values, reflecting the effects of circulating fan heat.
db-Dry Bulb Ratings are based on:
SEER - Seasonal Energy Efficiency Ratio Cooling Standard: 80 °F db, 67 °F wb indoor entering -air temperature
wb -Wet Bulb and 95 °F db outdoor entering -air temperature.
COP - Coefficient of Performance 2. Before purchasing this appliance, read important energy cost and
HSPF- Heating Season Performance Factor efficiency information available from your retailer.
* Air Conditioning & Refrigeration Institute.
N * *At "A" conditions -80 °F indoor db /67 °F indoor wb & 95 °F outdoor db.
LU t Rated in accordance with U.S. Government DOE Department of Ener-
C gy) test procedures and /or ARI Standards 210/240 -94.
RCP
GAS HEATING CAPACITIES AND EFFICIENCIES
UNIT 48ES HEATING INPUT (Btuh) OUTPUT CAPACITY TEMPERATURE RISE AFUE (%)
(Btuh) RANGE ( °F)
018040 40,000 32,000 (48ES) 30 79.7 (48ES)
31,000 (48ESN) 79.2 (48ESN)
024040
030040 40,000 32,000 20 -50 80.1
024060 35 -65 78.4
030060 35 - 65 78 4
60,000 47,000
036060 25 -55 78.7
042060 25 -55 78.7
036090 90,000 72,000 40 -70 79.9
042090 90,000 72,000 40 -70 79.9
048090 90,000 71,000 25 -55 78.5
060090 90,000 71,000 25-55 78.6
048115 115,000 93,000 (48ES) 35 -65 81.1 (48ES)
060115 90,000 (48ESN) 78.3 (48ESN)
El 048130
060130 130,000 104,000 40 -70 80.3
t.
LEGEND
AFUE - Annual Fuel Utilization Efficiency
NOTE: Before purchasing this appliance, read important energy cost
and efficiency information available from your retailer.
OUTDOOR SOUND: OCTAVE BAND DATA - DECIBELS
UNIT 48ES
Capacity 018 024 030 036 042 048 060
Sound Ratings* dBA 72 76 73 76 74 79 78
Frequency (Hz) dB
125 58.0 61.5 63.0 64.5 61.5 66.5 64.0
250 60.5 65.0 64.5 70.0 65.5 70.5 71.0
500 67.5 71.5 68.5 70.0 68.0 73.0 69.5
1000 66.5 70.5 67.0 70.0 69.0 1 73.5 72.5
2000 62.5 66.5 64.0 66.5 66.5 69.5 71.0
4000 56.5 61.5 60.0 61.5 61.0 66.0 67.5
8000 48.5 55.0 54.0 53.0 56.5 59.5 60.0
8 Tested in accordance with ARTstandard370 - (noflisted in ART
• 4
PHYSICAL DATA
UNIT SIZE 018040 I 024040 024060 030040 030060 036060 I 036090 042060 042090
NOMINAL CAPACITY (ton) 1 -1/2 2 2 2 -1/2 2 -1/2 3 3 3 -1/2 3 -1/2
OPERATING WEIGHT lb. 282 296 296 313 313 338 338 401 401
OPERATING WEIGHT (kg) 127.9 134.2 134 2 142.0 142.0 153.3 153.3 ' 181 9 181.9
COMPRESSORS Scroll
( Quantity 1
• REFRIGERANT (R -410A)
Quantity (lb.) 5.0 6.9 6.9 8.0 8.0 9.2 9.2 8.8 8.8
Quantity (kg) 2.3 3.1 3 1 3.6 3.6 4.2 4.2 4.0 4.0
-■ REFRIGERANT METERING DEVICE _ TXV
CONDENSER COIL
Rows... Fins /in. 1...21 2...21 2..21 2..21 2...21 2..21 2...21 2...21 2..21
Face Area (sq ft) 10.2 10.2 10 2 11 9 11.9 13.6 13 6 15.5 19 4
CONDENSER FAN
Nominal Ctm 2200 2200 2200 2800 2800 3000 3000 3500 3500
Diameter (in.) 22 22 22 22 22 22 22 22 22
Diameter (mm) 558.8 558.8 558.8 558.8 558.8 558.8 558.8 558 8 558.8
Motor Hp (Rpm) 1/8 (825) 1/8 (825) 1/8 (825) 1/8 (825) 1/8 (825) 1/8 (825) 1/8 (825) 1/8 (825) 1/8 (825)
EVAPORATOR COIL
Rows...Fins /in. 3...17 3..17 3. 17 3.17 3...17 4.. 17 4...17 i 3.. 17 3...17
Face Area (sq ft) 3.7 3.7 3.7 3.7 3.7 3.7 3.7 4.7 4.7
INDOOR GLOWER I
Nominal Airflow (Cfm) 650 800 800 1000 1000 1200 1200 1400 1400
Size (in.) 10x10 10x10 10x10 10x10 10x10 10x10 10x10 11610 11x10 WI
Size (mm.) 254x254 254x254 254x254 254x254 254x254 254x254 254x254 279.4x254 279.4x254 0
Motor HP (RPM) 1/4 (825) 1/3 (1050) 1/3 (1050) 1/3 (1050) 1/3 (1050) 1/2 (1000) , 1/2 (1000) 1/2 (1075) 1/2 (1075) Cr
FURNACE SECTION*
Burner Orifice No. (Qty... Drill Size)
Natural Gas 2...44 2.. 44 2 ..38 2...44 2...38 2...38 3...38 2..38 2.. 38
Propane Gas 2. 50 2...50 2...46 2.. 50 2.. 46 2 46 3...46 2...46 2...46
HIGH- PRESSURE SWITCH 650 + /- 15
(psig) Cut -out Reset (Auto) 420 +/- 25
LOSS -OF- CHARGE / LOW -PRES• 20 +/- 5
SURE SWITCH (Liquid Line) (psig) 45 +(- 10
cut -out Reset (auto)
RETURN -AIR FILTERS -4 20x24x1 24x30x1 24x36x1
Throwaway Size (in.) 508x610x25 (mm) 610x762x25 (mm) I 610x914x25 (mm)
UNIT SIZE I 048090 048115 1 048130 060090 060115 060130
NOMINAL CAPACITY (ton) 4 4 4 5 5 5
OPERATING WEIGHT lb 418 418 j 418 446 446 446
OPERATING WEIGHT kg 189.6 189.6 189.6 202.3 202.3 202.3
COMPRESSORS Scroll
Quantity 1
REFRIGERANT (R -410A)
Quantity (lb.) 9.0 9.0 9.0 10.5 10.5 10.5
Quantity (kg.) 4.1 4.1 4.1 4.8 4.8 4.8
r REFRIGERANT METERING DEVICE TXV
CONDENSER COIL
Rows...Fins /in. 2...21 2...21 2...21 2...21 2...21 2...21
Face Area (sq ft) I 19.4 19.4 19.4 19.4 19.4 19.4
CONDENSER FAN
Nominal Cfm 3500 3500 3500 4200 4200 4200
Diameter (in.) • I 22 22 22 22 22 22
Diameter (mm) 558.8 558.8 558.8 558.8 558.8 558.8
Motor Hp (Rpm) 1/4 (1100) 1/4 (1100) 1/4 (1100) 1/4 (1100) 1/4 (1100) 1/4 (1100)
EVAPORATOR COIL
Rows...Fins /in. I 3...17 3...17 3...17 4...17 4.,.17 4...17
Face Area (sq ft) 5.7 5.7 5.7 5.7 5.7 5.7
INDOOR BLOWER
Max 1600 1600 1600 2000 2000 2000
Size (In.) 11x10 11x10 11x10 11x10 11x10 11x10
Size (mm) 279.4x254 279.4x254 279.4x254 279.4x254 279.4x254 279.4x254
Motor HP (RPM) 1/2 (1075) 1/2 (1075) 1/2 (1075) 1.0 (1040) 1.0 (1040) 1.0 (1040)
FURNACE SECTION* i
Burner Orifice No. (Qty...Drill Size) i
Natural Gas 1 3...38 3...33 3...31 3.. 38 3...33 3...31
Propane Gas I • 3...46 3...42 3...41 3...46 3...42 3...41
HIGH- PRESSURE SWITCH 650 +/- 15
(psig) Cut -out Reset (Auto) 420 +/- 25
LOSS -OF- CHARGE / LOW - PRESSURE 20 +/- 5
SWITCH (Liquid Line) (psig) cut -out Reset 45 +/ 10
(auto)
RETURN -AIR FILTERS (in.)t# I 24x36x1
Throwaway ; 610x914x25 (mm)
*Based on altitude of 0 to 2000 ft.
t Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300 ft/
minute for throwaway type or 450 ft /minute for high - capacity type. Air filter pressure drop for non - standard filters must not exceed 0.08 in. we.
$ If using accessory filter rack refer to the filter rack installation instructions for correct filter sizes and quantity.
1
5
UNIT DIMENSIONS - 48E5018 -036
254.0 546.1 250.0
110 001 121.501 110.001
B6 1
91
III illt
OIOCxOPf PANEL ON 018 ONLY 0)1102 SUPPLY
13 6
r
13 101 - 1021 Od2 OXL,I -
�111111111►11111IIIIIIi ° ` -
L
�32roxu 1 � 1 oPr lox7 n
AE.UAX 1 SUPPLY III
` .iIlIIIII111I11111II . 1 417 A I A
- - 106 4 I I I I I OPENING 0R \ OPENING III
116.00 y 1 11111 II111 _ SUPPL0(1UA �,`'\`; �� % // - -I II I 80
.5 402.0 DUCT oucr 'III ��. j/. II L ___ '1: n
115 831 OPf xIXG OP(xI NG I \ `'�, _ �j IN l.
(ONO COIL- �� a l l6�011
I0181 NON BENZ
I�Illlllllllllllllln��I U 1 - ., Z
L 111 1 0000 COI ,
14 631
EVAP 2 TOP VIEW
0 3
1
13.481
249.6 550 5 249.6
19.831 121.611 19.831
CO REAR VIEW
LL1
CC)
Ct R EQUIRED CLEARANCE TO COMBUSTIBLE MATL REQUIRED CLEARANCE FOR OPERATION AND SERVICING
INCHES [mm]
(Refer to Maximum Operating Clearances) INCHES [mm] EVAP. COIL ACCESS SIDE 36,00 [914.01
TOP OF UNIT 14.00 [355.6] POWER ENTRY SIDE 42.00 [1066.8]
DUCT SIDE OF UNIT 2.00 [50,8] (EXCEPT FOR NEC REQUIREMENTS)
SIDE OPPOSITE DUCTS 14.00 [355.5] UNIT TOP 48.00 [1219.2]
BOTTOM OF UNIT 0.50 [12.7] SIDE OPPOSITE DUCTS 36.00 [914,0]
DUCT PANEL 12.00 [304.8] *
NEC. REQUIRED CLEARANCES. BETWEEN UNITS, POWER ENTRY SIDE 42.00 [106 11066.8] *MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 12.00 [304.8] FROM
INCHES [mm] WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE .36.00 [914.01
UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES, POWER ENTRY SIDE 42.00 [1056.8]
LEGEND
CG - Center of Gravity
COND - Condensor
EVAP - Evaporator
NEC - National Electrical Code
REQ'D - Required
NOTE: Dimensions are in in. [mm]
198.5 193.9 116 3
131 441 141 001 14.581
FIELO C000, 23 0
SE AU IC[ POA15 10.911 ilIr
26 6 11.131 01A 8 O,
_ POWER [X1AY 11 111111111111111
/1 1111111111![ I111I11IIIIIIII 2 NOLE 1111111111111
11111111111111111 11111I11111111111II! CONTROL ENTRY
m 0
14.841 54 1 A I iLT 1/ co
510 3
122.151 156.2 r - --
:! 11 1 961 311.2 2 .lst n3�617 208 B I
1 1 a.zzl
0.751 DUPLE. 1_,2.7 _-... '
19.0 10.151 N P 1. 11.681 O OLOCIR Ofl, 8 8000 A. GAS S[Ci ION 46.8 12 7 10 501 x P i
22'0 DP, RUE X000 468 326.5 3 1 , ELECiAtCAI ACCC58 PAX 11 841 GAS ENTRY
5.0
112.857 52.8 -- 10.201
-.- 12.4 12.081
12 851 1226.3
148 281 1 22.2
132.0 14 811
132 127
LEFT SIDE VIEW FRONT VIEW RIGHT SIDE VIEW
A05166
UNIT HEIGHT CENTER OF GRAVITY
UNIT WEIGHT IN. [MM]
UNIT ELECTRICAL IN. [MM]
CHARACTERISTICS lb kg A" X Y Z
48ES018 208/230 -1 -60 282 127.9 37.02 [940] 23.3 [591.8] 15,5 [393.7] 15.5 [393.7]
48ES024 208/230 -1 -60 296 134.2 37.02 [940] 23.6 [599.4] 15.8 [401.3] 15.7 [398.8]
48ES030 208/230 -1 -60, 208/230 -3 -60 313 142.0 39.02 [991] 23.3 [591.8] 15.7 [398.8] 15.8 [401.3]
48ES036
208/230-1-60, 208/230 -3 -60 338 153.3 41.02 [1042] 23.0 [584.2] 15.8 [401.3] 16.6 [421.6]
460 -3 -60
8
1 2 -.-
e
- - - � M INIMUM HEIGHT' 36'
E TL
11 tt -I ". %- 1 DET A / �/ -
0 ' ' , S UNIT HEIGHT
SEE DETAIL A'/ a
a I
3 4,)-
A07216 A05161 W
CORNER WEIGHTS (SMALL CABINET) CORNER WEIGHTS (LARGE CABINET) la
018 024 030 036 Unit 042 048 060 Cr
Unit lb kg lb kg lb kg lb kg Total Weight lb 1 kg lb kg lb kg
Total Weight 282 127.9 296 134 2 313 142.0 338 153.3 Total Weight 401 181.9 418 189.6 446 202.3
Corner Weight Corner Weight 68 30.6 62 28.1 54 24.5
1 73 33.1 59 26.8 55 25.1 72 32.5 1
Corner Weight Corner
60 27.4 119 53.8 135 61.2 158 71.7
2 84 38.0 95 42.9 89 40.3
Corner Weight Corne 3Weight 60 27 2 64 29.2 81 36 6
3 95 43.0 81 36.8 78 35.2 95 43.0
Corner Weight Corner 155 70.3 157 71.1 154 69.7
54 24.4 72 32.6 85 38,7 83 37.5
4
Rigging Weight 301 136.5 315 142.9 332 150.6 357 161.9 Rigging Weight 423 191.8 440 199.5 468 212.2
Shipping Shipping 463 210.0 480 217.7 508 230.4
Weight 336 152.4 350 158.7 367 166.4 392 177.8 Weight
SELECTION PROCEDURE (WITH EXAMPLE)
1. Determine cooling and heating requirements at 4. Determine fan speed and power requirements
design conditions: at design conditions.
Given: Before entering the air delivery tables, calculate the total static pres-
Required Cooling Capacity (TC) 34,000 Btuh sure required. From the given example, the Wet Coil Pressure Drop
Table, and the Filter Pressure Drop Table:
Sensible Heat Capacity (SHC) 25,000 Btuh 0.100 in. wc
r Required Heating Capacity 60,000 Btuh External Static Pressure
Filter 0.130 in. wc
Condenser Entering Air Temperature 95 °F 0.059 in. wc
Indoor Air Temperature 80 °F edb 67 °F ewb Wet Coil Pressure Drop 0.289 in. wc
Evaporator Air Quantity 1200 CFM
Total Static Pressure
External Static Pressure 0.100 in. wc Enter the table for Dry Coil Air Delivery - horizontal and down-
% from th
flow Discharge. For 208v operation, deduct 10% e value
Electrical Characteristics /08 -1 -60 given. At 0.33 ESP (external static pressure), the fan will deliver
1404 cfm at medium speed. The fan speed should be set at medium
2. Select unit based on required cooling capacity. speed.
Enter Net Cooling Capacities table at condenser entering tempera-
ture of 95 °F. Unit 036 at 1200 cfm and 67 °F ewb (entering wet 5. Select unit that corresponds to power source
bulb) will provide a total capacity of 36,000 Btuh and a SHC of available.
27,400 Btuh. Calculate SHC correction, if required, using Note 4
Capacities The Electrical Data Table shows that the unit is designed to operate
under Coolin
g p acities tables. at 208 -1 -60.
3. Select h capacity of unit to provide
design condition requirement.
In the Heating Capacities and Efficiencies table, note that the unit
036090 will provide 72,000 Btuh with an input of 90,000 Btuh.
•
11
ELECTRICAL DATA
VOLTAGE SUPPLY
COMPRESSOR OFM IFM
UNIT NOMINAL RANGE FUSE OR
V -PH -HZ MIN MAX RLA LRA FLA FLA MCA HACR BKR
48E-S -018 9.0 48.• 4.9 1.8 13.9 20
1 "'• 48ES -024 13.5 58.3 0.9 2.0 19.7 30
48ES -030 12.8 64.0 0.9 2.0 18.9 30
48 -036 4. 77.0 0.9 4.1 22.6 5
48 -042 17.9 112.0 0.9 4.1 27.4 40
48 -048 21.8 117.0 1.5 4.1 32.8 50
48ES -060 208/230 -1 -60 26.4 134.0 1.5 6.2 40.7 60
48 1 018
•.0 48.0 0.• 8 13.• 29
48 X0
13.5 58.3 0.9 2.0 19.7 30
48 1030 12.8 .4.0 •.9 2.0 18.9 30
48 NO36 14.1 • 77.0 0.9 4.1. 22.6 35
48ESN042 1 g7 253 17.9 112.0 0.9 4.1 27.4 40
48ESN048 21.8 117.0 1.5 4.1 32.8 50
48 1 060 26.4 134.0 1.5 6.2 40.7 60
48 -030 10.1 58.0 0.9 2.0 15.5 25
48 -036 9.2 71.0 0.9 4.1 16.5 25
48 S -042 13.5 88.0 0.9 4.1 21.9 30
4: -048 13.8 83.1 1.5 4.1 22.9 35
48 -06• 208/230-3-60 17.7 110.0 1.5 6.2 29.8 40 , CO
48 1 0 0 10.1 58.0 0.9 2.0 15.5 25
48ESNO36 9.2 71.0 0.9 4. 16.5
48 1 042 13.5 88.0 0.9 4. .9 0
48 1 048 13.8 83.1 1.5 4.1 22.9 35
48 1 060 17.7 110.0 1.5 6.2 29.8 40
48 -03. 5.6 8.0 0.6 1.9 9.5 15
48 -04 6.0 44.0 0.6 1.9 10.0 15
48 -048 6.2 41.0 •.8 1.9 0.5 15
48 -060 460 -3 -60 414 506 7.8 52.0 0.9 2.7 13.3 20
. 48 1 036 5.6 38.0 0.6 1.9 9.5 15
48 1 042 6.0 44.0 0.6 1.9 10.0 15
48 1 048 6. 41.0 0.: .9 10.5 15
48 1 060 7.8 52.0 0.9 2.7 13.3 20
EXAMPLE: Supply voltage is 230 -3 -60,
A a c AB =v
LEGEND BC = 231 228 v
AC = 227 v
--
FLA -- Full Load Amps C 11@ Fl 228 + 231 + 227
LRA Locked Rotor Amps 1J a7 Average Voltage =
MCA -- Minimum Circuit Amps 3
MOCP -- Maximum Overcurrent Protection MOTOR 686
RLA -- Rated Load Amps = 3
= 229
r NOTES:
1. In compliance with NEC (National Electrical Code) requirements Determine maximum deviation from average voltage.
for multimotor and combination load equipment (refer to NEC (AB) 229 - 228 = 1 v
(BC) Articles 430 and 440), the overcurrent protective device for the BC) 231 - 229 = 2 v
unit shall be Power Supply fuse. The CGA (Canadian Gas (AC) 229 - 227 = 2 v
Association) units may be fuse or circuit breaker. Maximum deviation is 2 v.
2. Minimum wire size is based on 60 C copper wire. I fother than Determine percent of voltage imbalance
60 C wire is used, or if length exceeds wire length in table, 2
determine size from NEC. % �bltage Imbalance = 100 x -
3. Unbalanced 3 -Phase Supply Voltage 229
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2 %. Use the following formula to determine = 0.8%
the percentage of voltage imbalance This amount of phase imbalance is satisfactory as it is below the
% Voltage imbalance maximum allowable 2 %.
= 100 x max voltage deviation from average voltage
average voltage IMPORTANT: If the supply voltage phase imbalance is
more than 2 %, contact your local electric utility company
immediately.
A06564
21 ,