Carrier 38AH024-034 User Manual

HEATING & COOLING

38AH024-034

Air-Cocled Condensing Units

50/60 Hz

Installation, Start-up and Service

Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS .. .

BEFORE INSTALLATION

Rigging .............................................................. 1

Placing Unit ....................................................... 1

Mounting Unit
Compressor Mounting

INSTALLATION
Refrigerant Piping Connections
Solenoid Drop Refrigerant Control
Filter Drier and Moisture Indicator
Receiver

Piping Procedure ............................................... 5

Power Supply

Power Wiring ..................................................... 7

PRE-START-UP ................................................ 14

System Check

Leak Test and Dehydration............................... 14

Preliminary Charge

START-UP....................................................... 14-16

Preliminary Checks
Preliminary Oil Charge
Start Unit
Adjust Refrigerant Charge
Check Compressor Oil Level

Final Checks..................................................... 15

SEQUENCE OF OPERATION
Single Air Handler —

2-Stage Cool Thermostat ............................... 17

Two Air Handlers —

Two 2-Stage Cool Thermostats

(One Per Air Handler)
Restart
Causes of Complete Unit Shutdown

SERVICE ....................................................... 18-20

Access for Servicing .......................................... 18

Fan Adjustment
Oil Charge
Liquid Shutoff/Charging Valve
Capacity Control, Suction Pressure-

Capacity Control, Electrically Operated

Oil Pressure Safety Switch (OPS)
Compressor Protection

High-Pressure Switches
Low-Pressure Switches

Winter Start Control ........................................... 20

Head Pressure Control

TROUBLESHOOTING.....................................21-23

START-UP CHECKLIST

..............................................................

Actuated Unloaders

Unloaders (Variable Air Volume
Factory-Installed Option Units)

....................................................

.......................................

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....................

CL-1, CL-2

1

1-5

5
5

5-13

5
5
5
5

7

14
14

14
14

14
15
15

17

17

17

17

18

18

18

18

18
18

18
18

18

20

SAFETY CONSIDERATIONS

Installing, starting up, and servicing air-conditioning equip
ment can be hazardous due to system pressures, electrical
components, and equipment location (roofs, elevated struc
tures, etc.)

Only trained, qualified installers and service mechanics
should install, start up, and service this equipment (Fig. 1).

Untrained personnel can perform basic maintenance func
tions such as cleaning coils. All other operations should be
performed by trained service personnel.

When working on the equipment, observe precautions in
the literature and on tags, stickers, and labels attached to
the equipment.

• Follow all safety codes.

• Wear safety glasses and work gloves.

• Keep quenching cloth and fire extinguisher nearby when

brazing.

• Use care in handling, rigging, and setting bulky

equipment.

• See Table lA or IB for Physical Data.

S ilii

¿5

ELECTRIC SHOCK HAZARD
Open all remote disconnects before ser

vicing this equipment.

BEFORE INSTALLATION

Rigging — Preferred method is with spreader bars from

above the unit. Use 2-in. (50 mm) OD pipe or hooks in lift

ing holes. Rig with 4 cables and spreader bars. All panels

must be in place when rigging. See rigging label on unit for
details concerning shipping weights, distance between lift
ing holes, center of gravity, and spreader bar dimensions.

See Fig. 2.

If overhead rigging is not possible, place condensing unit
on skid or pad for rolling or dragging. When rolling, use
minimum 3 rollers. When dragging, pull the pad. Do not
apply force to the unit. When in final position, raise from

above to lift unit off pad.

A CAUTION

All panels must be in place when rigging. Do not fork
units if no skid is supplied. If unit has skid, truck from
sides only.

Placing Unit — There must be 4 ft (1200 mm) for ser

vice and for unrestricted airflow on all sides of unit, and a
minimum of 8 ft (2440 mm) clear air space above unit. For
multiple units, allow 8 ft (2440 mm) separation between
units for airflow and service.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 11 PC 111 Catalog No 563-739 Printed in U.S A Form 38AH-7SI Pg 1 4-93 Replaces: New
Tab 3a

UNIT

38AH

024
024C
028
028C
034
034C

3/4 IN. Cl9 MM) NOTCHES

IN END OF SPREADERS

MAX SHIPPING

WEIGHT

lbs

2240
2403
2300
2463
2360
2577

kgs in.

1018
1092
1045
1120
1073
1171

Fig. 1 - Model 38AH (Size 024 Shown)

NOTES:

1. Use 2 in OD {50 mm) pipe or hooks in lifting holes

2. Rig with 4 cables and spread with two ‘D’ long and two ‘A’ long 2

X 4 in. (50 X 100 mm) or equal.

3. Run the rigging cables to a central suspension point so that the
angle from the horizontal is not less than 45 degrees

4 Shipping weights include skid

All panels must be in place with rigging.

NOTICE TO RIGGERS

LIFTING HOLES

‘A’

mm in.

81

2057

CENTER OF GRAVITY

‘B’ ‘C’ ‘D’

40 0

43.0
39 3

42.3
41 0
44 0

mm

1016
1092

997

1073

1041

1118

in.

32.8

A CAUTION

DISTANCE BETWEEN

RIGGING CABLES

mm in. mm

832

73 5

1867

Fig. 2 — Rigging Label

Table 1A — Physical Data — English

6

66*
33t

76
58

024

6
1750 1750
1450 1450

__

—

—

—

UNIT 38AH

OPERATING WEIGHT (lb)

With Alurninum-FIn Coil 1760 1820

With Copper-Fin Coil 1923

COMPRESSOR

Type

Quantity Cylinders (ea)

Speed (rpm) — 60 Hz

Capacity Steps

(FIOP or Асу) - %

Unloader Setting (psig)
— Load
— Unload

- 50 Hz

- %

- %

Circuit 1 Circuit 2 Circuit 1

06DH824 06DA824 06DH328 06DA328

1750
1450

100 100 100 100

OIL CHARGE PER CIRCUIT (Pt)

REFRIGERANT, TYPE**

Shipping Charge (lb)

Operating Charge, Typical (lb)

CONDENSER FANS

Quantity...Dia (in.)
Nominal Hp

Nominal Airflow (cfm) 16,700

Speed (rpm) — 60 Hz
Watts (ea) - 50/60 Hz

CONDENSER COIL

Rows...Fins/in.
Total Face Area (sq ft)

- 50 Hz

Storage Cap. (Ib)tt

CONTROLS

Pressurestat (psig)
High Pressure

Cutout
Cut-in

Low Pressure

Cutout
Cut-in

Oil Pressure

Cutout (Diff)
Cut-in (Diff)

FAN CYCLING CONTROLS

No. 2 Fan:

Temp Close (F)
Temp Open (F)

PRESSURE RELIEF

Location

Temp (F)

CONNECTIONS (Sweat) (ea ckt)

Suction — in. OD

3 3 3

20 20 20 20

2..

30

1 0

2.. 19
39 20 39 20 39.20

37 7

Liquid — in. OD

LEGEND

Diff — Differential
FlOP — Factory-Installed Option
VAV — Variable Air Volume

'Standard unit — single suction pressure-actuated unioader on compressor no 1

tVAV FiOP — doubie eiectrically actuated unloaders on compressor no 1

"With 25 ft of interconnecting piping

ttCondenser 80% full of liquid R-22 at 120 F

028

Circuit 2 Circuit 1 Circuit 2

1982

Reciprocating Semi-Hermetic

6 6

66*
33t

Factory
76
58

1750
1450

—

—

Installed

—

— 58

10

R-22

Propeller Type — Direct Driven

Enhanced Copper Tubes, Aluminum Lanced Fin

2 30 2. .30

1 0 1.0

16,700 15,700

1140

950

1550

2

3 3 3

19

37.7 56.6

± 7

426
320 ± 20

27

± 3

44 ± 5

Manual Reset

60

8.8

70 ± 3
60 ± 3

Liquid Line, Suction Line, Compressor

Fusible Plug

210

1%

%

034

1880
2097

06DH328 06DA537

6 6
1750 1750
1450

100 100

66*
33t

76

1450

—
—

—
—

25 25

3.. 17

Table IB — Physical Data — SI

UNIT 38AH

OPERATING WEIGHT (kg)

With Aluminum-Fin Coii

With Copper-Fin Coii

COMPRESSOR

Type

Quantity Cyiinders (ea)
Speed (r/s) — 60 Hz

Capacity Steps

(FlOP or Асу) - %

Unloader Setting (kPa)
— Load
— Unioad

- 50 Hz

- %

- %

Circuit 1

06DH824

29.2

24.3 24 3 24 3 24.3
100 100 100 100

024 028

Circuit 2 Circuit 1 Circuit 2

798 3
872 3

06DA824 06DH328

6 6

66*
33t

524
400

29.2 29.2

—
—

—

— 400

OiL CHARGE PER CIRCUIT (L)

REFRIGERANT, TYPE**

Shipping Charge (kg)

Operating Charge, Typicai (kg)

CONDENSER FANS

Quantity...Dia (mm)
Nominal Hp
Nominal Airflow (L/s)

Speed (r/s) — 60 Hz

Watts (ea) — 50/60 Hz

CONDENSER COIL

Rows...Fins/m

- 50 Hz

Total Face Area (sq m)

Storage Cap. (kg)tt

CONTROLS

Pressurestat (kPa)
High Pressure

Cutout

Cut-in

Low Pressure

Cutout
Cut-in

Oil Pressure

Cutout (Diff)
Cut-in (Diff)

FAN CYCLING CONTROLS

No. 2 Fan;

Temp Close (C)
Temp Open (C)

PRESSURE RELIEF

Location
Temp (C)

CONNECTIONS (Sweat) (ea ckt)

Suction — in. OD
Liquid — in. OD

1 36

9.1 9.1

2 ..762

7870

2 ..748

174

1 36 1.36 1.36

1.0

Enhanced Copper Tubes, Aluminum Lanced Fin

3.64 3 64

LEGEND

Diff — Differential

Flop — Factory-Installed Option

VAV — Variable Air Volume

‘Standard unit — single suction pressure-actuated unloader on compressor no. 1

tVAV FlOP — double electrically actuated unloaders on compressor no 1

“With 7.6 m of interconnecting piping

ttCondenser 80% full of liquid R-22 at 48.8 C.

825 6

899.0

Reciprocating Semi-Hermetic

6

66*
33t

Factory

524

06DA328

Installed

6

29 2

_

—

—

4.73
R-22

9 1 9.1

Propelier Type — Direct Driven

2 762

1.0

7870

19
16

1550

2

748

174

2937 ± 48
2206 ± 138

± 21

186

± 34

303

Manuai Reset

41.4

60.7

21 1 ± 1.6

± 1.6

156

Liquid Line, Suction Line, Compressor

Fusible Plug

99

1%

%

Circuit 1

06DH328

6

29.2

24.3
100

66*
33t

524
400

1 36

11.4

034

853 0

951.2

2...762

1.0

7400

3 670

3.64

26.0

Circuit 2

06DA537

6

29 2

24.3
100

—

—

—
—

1.36

11.4

Mounting Unit — When unit is in proper location, use

of mounting holes in base rails is recommended for secur
ing unit to supporting structure, or for mounting unit on
vibration isolators if required. Fasteners for mounting unit
are field supplied. Be sure to mount unit level to ensure
proper oil return to compressors.

Compressor Mounting — As shipped, compressor

is held down by 4 bolts. After unit is installed, loosen each
bolt until the snubber washer can be moved with finger pres
sure. See Fig. 3.

SNUBBER FLANGED
WASHER

NEOPRENE
SNUBBER

COMPRESSOR FOOT

ISOLATION SPRING

Fig. 3 — Compressor Mounting

INSTALLATION

Refrigerant Piping Connections — Line sizes de

pend on length of piping required between condensing unit
and evaporator. See Table 2A or 2B. It is important to con
sider liquid lift and compressor oil return. Refer to Part 3 of
Carrier System Design Manual for line sizing information,
and Fig. 4 for recommended piping details.

Solenoid Drop Refrigerant Control — All units

are factory wired to operate on solenoid drop refrigerant
control. A field-supplied liquid line solenoid valve must be
installed in the liquid line ahead of the indoor coil. See
Fig. 5. Wires from solenoid valve do not need to be in con
duit as coil voltage is 24 v (class 2 circuit).

A WARNING

Failure to properly install liquid line solenoid at the in
door unit as described, without Carrier authorization,
may VOID warranty.

Filter Drier and Moisture Indicator — Every unit

should have a filter drier and a sight glass (moisture indi
cator) field installed. Select the filter drier for maximum
unit capacity and minimum pressure drop. Figure 5 shows
recommended locations of filter drier(s) and sight glass(es).
Complete the refrigerant piping from the evaporator to the
condenser before opening the liquid and suction lines at the
condensing unit.

Receiver — No receiver is provided with the unit; it is

recommended that one not be used.

Piping Procedure — Do not remove run-around pipe

from suction and liquid line stubs until piping connections

TXV — Thermostatic Expansion Vaive
NOTES:

1. Lower section is first on and last off.

2. For more complete piping information, refer to Carrier System
Design Manual, Part 3, or E20-II refrigerant piping computer
program

Fig. 4 — Suction Line Piping to Unit with

2-Section Coil Split

fieLd-supplied

SOLENOID VALVE

SIGHT GLASS

Fig. 5 — Liquid Line Solenoid Valve,

Filter Drier(s), and Sight Glass Locations

are ready to be made. Pass nitrogen or other inert gas through
piping while brazing, to prevent formation of copper oxide.

Install field-supplied thermostatic expansion valve (TXV)

in liquid line ahead of each evaporator section.
SUCTION PIPING AT EVAPORATOR AND TXV BULB

LOCATION (See Fig. 5) — The purpose of these recom
mendations is to achieve good mixing of the refrigerant leav
ing the evaporator suction header for proper sensing by the
TXV bulb.

1. A minimum of two 90 degree elbows must be installed
upstream of the expansion valve bulb location.

2. The TXV sensing bulb should be located on a vertical
riser where possible. If a horizontal location is neces
sary, secure the bulb at approximately the 4 o’clock
position.

Copy continued on page 7.

Table 2A — Refrigerant Piping Sizes — 60 Hz

SINGLE SUCTION RISERS

LENGTH OF INTERCONNECTING PIPING FOR EACH CIRCUIT - ft

UNIT 38AH

024

028

034

Ckt 1
Ckt2

Ckt 1
Ckt 2

Ckt 1
Ckt 2

0-25 (0-7.6)

L

V2 1Ve
V2 1Ve

Vz

V2

Vz
Vz 1%

s

1У8 %
1У8 %

1У8 %

25-50 (7.6-15.2) 50-75 (15.2-22.9) 75-100

L S L s L

% 1% %
% 1% %

1% %

13/8
13/8

% 1% У8

DOUBLE SUCTION RISERS

LENGTH OF INTERCONNECTING PIPING - ft (m)

UNIT 38AH

024

028

034

Ckt 1
Ckt 2

Ckt 1
Ckt 2

Ckt 1
Ckt 2

50-75 (15.2-22.9)

A

_ _ —
—
__
— —

1Уе

В С

—
_

13/8

- —

—
_

“

15/8

— — —

75-100 (22.9-30.5)

A

1Ув

1У8
1Уе

1Уе
1У8

В С

13/в
13/8 13/8

13/8
13/8

13/8

Table 2B — Refrigerant Piping Sizes — 50 Hz

SINGLE SUCTION RISERS

LENGTH OF INTERCONNECTING PIPING FOR EACH CIRCUIT - ft

UNIT 38АН

0-25

(0-7.6)

L s

024

028

034

Ckt 1
Ckt 2

Ckt 1
Ckt 2

Ckt 1 Vz V/a
Ckt 2 Vz V/s

У2
У2

Vz
V2

1У8 3/e
1У8 3/8

1У8

1Va

DOUBLE SUCTION RISERS

LENGTH OF INTERCONNECTING PIPING - ft (m)

UNIT 38AH 75-100 (22.9-30.5)

A

024

028

034

Ckt 1
Ckt 2

Ckt 1
Ckt 2

Ckt 1 1У8
Ckt 2

LEGEND

L — Liquid Line

S — Suction Line

‘Double suction riser required if evaporator is below condensing

unit and 2 unloaders are used

tDouble suction riser required if evaporator is below condensing

unit and compressor is equipped with 2 unloaders. Note the only
time circuit no. 2 may be equipped with 2 unloaders is if it is serv
ing its own air handler and the unit does not require low ambient
operation (Motormaster® III control).

“Double suction riser required if evaporator is below condensing

unit and compressor has one or more unloaders

NOTES:

1. All line sizes are inches OD.

2. Standard unit comes with one pressure-operated unloader on cir
cuit no. 1. If unit serves one air handler, an additional unloader
may be field installed on circuit no 1 compressor only. If the unit
serves 2 separate air handlers and low-ambient operation is re
quired (Motormaster III control), each circuit’s compressor may
be equipped with only one unloader.

3 Equivalent line sizes in mm are as follows;

in. mm in.

У2

3/8 15.9

У8 22.2

1У8 28.6

1У8
1У8

1У8
1У8

1У8

12.7

25-50 (7.6-15.2) 50-75 (15.2-22.9) 75-100

L S L

13/8
13/8

%

3/s
3/8

3/8

13/8
13/8

13/8
13/8

В c A

13/8
13/e

13/8
13/8

13/8 13/8 13/8
13/8 13/8 13/e

13/8
13/8

13/8
15/e

mm

13/8 34 9
13/8 41.3

2Ув 54 0

1У8
1У8

1У8

IVe

13/8
13/8

13/8

%
%

13/8
13/8*

15/8

13/в

13/8 13/8 13/8
13/8 13/8 13/8

13/8 13/8

_

1Уз
1V8

13/в

s L

3/8

Vs

3/8
3/8

Vs

3/8

100-200 (30.5-61.0)

13/8
13/8

13/8
13/8

13/8
13/8

в c

13/8 13/8
13/8 13/8

13/8
13/8

13/8
13/8

UNIT 38AH

(g) — Suction Riser without Trap
(g) — Suction Riser with Trap

— Suction Line to Condensing Unit
— Use Single Suction Pipe Diameter Shown for 75 ft (22 9 m)

^ Interconnecting Pipe in Table Above

%

5/e

Ve
У8

У8
У8

100-200 (30.5-61.0)

А В

13/8

13/8

13/8

13/а

3/8
3/8

%

3/8

У8

Vs

13/8
13/8

2У8
2Ув

024
028
034

(m)

22.9-30.5) 100-200 (30.5-61.0)

У8
У8

L

s

13/8*
13/et

Vb

Vs
Vs

Vs

2Ув**
2У8**

2Уа**
21/8t

S

13/8*
13/8t

13/8*
13/et

13/8*
13/8

С

15/s
13/8

2У8
2У8

2У8
2Уа

(m)

22.9-30.5) 100-200 (30.5-61.0)

У8

L

s

13/8*

Vs
Vs

Vs

Vs

Vs

13/et
13/8**

13/8**
2У8*

2yet

S

13/8*

13/et

13/8*

13/et

15/8*
13/8

MAXIMUM LIQUID LIFT PER CIRCUIT

ft m

76
73

100

23.2

22.2

30.5

3. Size the suction line from the evaporator through the
riser for high velocity. Suction piping for the high
velocity section should be selected for about 0.5° F
(0.3° C) frietion loss. If a 2° F (1.1° C) loss is allowed
for the entire suction line, 1.5° F (0.8° C) is left for the
balance of the suction line and it should be sized on that
basis. Check that the high-velocity sizing is ade

quate for oil return up the riser.

If an oil return connection at the bottom of this suction
header is supplied with an evaporator, this connection must
be teed-in ahead of first mixing elbow. When the condens
ing unit is below the evaporator, the riser at the evaporator
does not have to extend as high as the top level of a given
evaporator circuit. After a 15-diameter riser has been pro
vided, the suction line may elbow down immediately.

SAFETY RELIEF — A fusible plug is located on unit liq
uid line before the liquid valve. Other fusible plugs are
located on the compressor(s) and on the suction line(s).

VAV (Variable Air Volume) APPLICATIONS — Field-

supplied suction line accumulators (one per circuit)
(Replacement Components Division, Carrier Part

No. KH73LZ001) are required for VAV applications in

outdoor units.

A WARNING

Failure to install accumulator in outdoor unit VAV ap
plications may VOID warranty.

Power Supply — Electrical characteristics of available

power supply must agree with unit nameplate rating. Sup
ply voltage must be within limits shown in Table 3.

IMPORTANT: Operating unit on improper supply volt
age, or with excessive phase imbalance, constitutes
abuse and may affect Carrier warranty. See Unbal
anced 3-Phase Supply Voltage, page 8.

4. Maximum field wire sizes allowed by lugs on terminal

block are as follows:

V-PH-HZ

208/230-3-60

380-3-60
460-3-60
575-3-60

230-3-50
346-3-50

400-3-50

WIRE SIZE

350 kcmil (177.90 sq mm)

2/0 AWG (67 42 sq mm)

350 kcmil (177.90 sq mm)

2/0 AWG (67.42 sq mm)

5. Terminals for field power supply are suitable for cop
per, copper-clad aluminum, or aluminum conductors.
Insulation must be rated 167 F (75 C) minimum.

CONDENSER FANS — The fans must rotate counter
clockwise when viewed from above. If necessary, correct
direction of fan rotation by interchanging any 2 power
input wires at disconneet switch. Affix crankcase heater
decal (located in installer’s packet) to unit disconnect
switch.

FIELD CONNECTIONS

1. Main Power — Bring wires from the fused disconnect
switch through hole in bottom rail of unit to control box

(Fig. 6) and connect to terminals

11

13

12

on line side of terminal block TBl (see Fig. 7 or 8). To
comply with NEC Article 440-14, the disconnect must
be located within sight from and readily accessible from
the unit.

2.

24-v Control Power — Units have single point power
connections. Control circuit is directly connected inter
nally to unit. Maximum 24-v control circuit is 3.2 amps.

NOTE; For wire runs, use the following sizes of insu
lated wire;

Ft

0-50

No 18 AWG No 16 AWG No 14 AWG

35 C Min 35 C Min 35 C Min

0-15.2 15.2-22.9

0 82 sq mm 1.30 sq mm 2 08 sq mm

35 C Min 35 C Min 35 C Min

50-75

Over 75

Over 22.9

Power Wiring — All power wiring must comply with

applicable local and national codes. Install field-supplied
branch circuit fused disconnect(s) per NEC (National Elee­trical Code [U.S.A. Standard]) of a type that can be locked
OFF or OPEN. Disconnect(s) must be within sight from
and readily accessible from unit in compliance with NEC
Article 440-14.

GENERAL WIRING NOTES

1. A crankcase heater is wired in the eontrol cireuit so it is
always operable as long as power supply disconnect is
on, even if any safety device is open or unit stop-start
switch is off. It is protected by a 5-amp circuit breaker
in control power.

2. The power circuit field supply disconnect should never

be open except when unit is being serviced or is to be
down for a prolonged period. When operation is re
sumed, crankcase heater should be energized for 24 hours
before start-up. If unit is to be shut down for a pro

longed period, it is recommended that the suction and
discharge valves be closed to prevent an excessive ac
cumulation of refrigerant in the compressor oil.

3. Power entry is at compressor end only.

3. Control Circuit Interlock — An airflow switch may be
installed in the indoor air handler to prevent unit from

running when indoor air is not flowing. This switch

(Carrier part no. HR81JE001) is available from Service
Parts Center, or equivalent can be field supplied. This
should be electrically interlocked in the control circuit
as shown on the label diagram affixed to the access panel
on end of unit. Note that for a single air handler with
constant volume controls (those shown in Fig. 7 and 8),
the airflow switch must be used in combination with a
relay having 2 sets of normally open contacts (Carrier
part no. HN61KK040 or equivalent). For wiring, see
unit label diagram on inside of unit access door.

4. ModuPanel™ Connections — Refer to Fig. 9 and 10 for
field connections.

5. Transformer Connections — See unit wiring label dia­gram, notes 1 and 2, located behind compressor com
partment end access door.

IMPORTANT: Ensure power to the crankcase

heater is always on (except when servicing the
unit). If circuit breakers inside unit shut down
the compressor and condenser fans, crankcase heater
remains on.

Table 3 — Electrical Data

60 HERTZ

UNIT 38AH

500

024

028

034

024 300 346

028

034

200
600

too

500
200
600 460
100 575

500
200
600
100

UNIT 38AH

800 230
900 400

800
300 346
900

800
300
900

Volts

3 Ph, 60 Hz

208/230

380

460
575

208/230

380

208/230

380
460

575

Volts

3 Ph, 50 Hz

230
400

230
346
400

UNIT COMPRESSOR

Supplied*

Min Max

187 254 100 8 125
342 418 61 8 80
414 508 50.3 60

632

518

254 110.5 150

187
342 418
414 508

632 47.1

518

254

187
342 418 77.0 110 256 8
414 508 65.8 90

632

518

MCA

42 1

135 5 175

MOCP
(Fuse)

50

67.2

55.9

53 3 70 193.8

90
70
60

ICF

408.4 39.3 39.3 198 198 2

193.8

204.2 196 196

168.4

468.4
215 8
234 2 22 1 22 1

188.8 19.7

506.4 43.6 63.6

340.2 22.1 30.0 114

50 HERTZ

UNIT COMPRESSOR

Supplied*

Min Max

254 101 2 125

198
311 380
342

400

198
311 380
342 400

198
311
342 400 65.1 90

MCA

254

254 135.9 175
380 78 1 110

1109 150

MOCP
(Fuse)

62.8 80 194.8 24 0

46.5 60 204 0 180

68.2

55.7

90
70

ICF

268.8 39.3 39.3

298 8 43.6

216.8
234 0

355 8 43.6 63 6 143

257.8 26.4 34.3 104 145 2 4.4 1
240 0 22 1 30 0 114

RLA LRA

Ckt 1

24 0

15.7

43.6
26 4 26 4

26.4 34 3 104

17.9 22 9

Ckt 1

26.4 26.4
22 1 22 1

Ckt 2 Cktl

24.0
157

43 6

19 7

RLA LRA

Ckt 2

24.0

18.0

43.6

Ckt 1 Ckt 2

FAN MOTORSt

Ckt 2

93 93
99 99
79 79

228 228
104 104
114 114

91

228 266

91 36

128 128

143 143 2
104 104 2
114 114 2 30

145
120

93 93
99 99

200
120

Qty

91

Qty

FLA
(ea)

6.2
2 39
2 3 1
2 3.4

2 62
2

39

2

3 1

3.4

2
2 62

2 39
2

3.1

2 34

FAN MOTORSt

FLA
(ea)

2 6.4
2 44 1
2

3.0

64
44 1

2 6.4
2 30

Hp

1

1

1

Hp

LEGEND

FLA — Full Load Amps
IGF — Maximum Instantaneous Current Flow during starting (the

LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps (complies with National Electrical Code

MOCP — Maximum Overcurrent Protection
RLA — Rated Load Amps

point in the starting sequence where the sum of the LRA for

the starting compressor, plus the total RLA for all running com

pressors, plus the total FLA for all running fan motors is
maximum)

[NEC], Section 430-24) (U.S.A Standard)

UNBALANCED 3-PHASE SUPPLY VOLTAGE - Never
operate a motor where a phase imbalance in supply voltage
is greater than 2%. Use the following formula to determine
the percent voltage imbalance:

% Voltage Imbalance

— 100 max voltage deviation from average voltage

average voltage

Example: Supply voltage is 240-3-60.

AB = 243 V
BC =236 V
AC =238 V

Average Voltage =

243 -F236 -F238

= 239 V

’Units are suitable for use on electrical systems where volt

age supplied to unit terminals is not below or above listed
minimum and maximum limits

tAII fans are protected by a single circuit breaker.

Determine maximum deviation from average voltage:

(AB) 243 -239 =4 V
(BC) 239 -236 =3 V
(AC) 239 - 238 = 1 V

Maximum deviation is 4 v.
Determine percent voltage imbalance:
% Voltage Imbalance = 100 x

■ 1.1%

4

239

This amount of phase imbalance is satisfactory as it is

below the maximum allowable 2%.

IMPORTANT: Contact your local electric utility com
pany immediately if the supply voltage phase imbal
ance is more than 2%.