Carrier 38AKS013-024 User Manual

Air-Cooled Condensing Units

Installation, Start-Up and

Service Instructions

38AKS013-024

50/60 Hz

CONTENTS

Page

SAFETY CONSIDERATIONS ...................1

INSTALLATION .............................1-12

Step 1 — Complete Pre-Installation

Checks ....................................1

Step 2 — Rig and Mount the Unit .............8

Step 3 — Complete Refrigerant Piping

Connections ...............................8

Step 4 — Install Accessories ................10

Step 5 — Complete Electrical

Connections ..............................10

PRE-START-UP .............................12

System Check ..............................12

Leak Test and Dehydration ..................12

Turn On Crankcase Heater ...................12

Preliminary Charge ..........................12

START-UP ................................13-16

Preliminary Checks .........................13

Preliminary Oil Charge ......................13

Start Unit ...................................13

Adjust Refrigerant Charge ...................13

Check Compressor Oil Level ................13

Final Checks ................................13

OPERATING SEQUENCE ....................17

Cooling .....................................17

Heating .....................................17

Fan Cycling .................................17

Winter Start Control .........................17

SERVICE ..................................17-19

Capacity Control ............................17

Head Pressure Control ......................17

Time GuardT II Circuit .......................17

Winter Start Control .........................18

Crankcase Heater ...........................18

Compressor Protection ......................18

High-Pressure Switches .....................18

Low-Pressure Switches .....................18

Outdoor Fans ...............................18

Lubrication .................................18

Cleaning Coils ..............................18

TROUBLESHOOTING ......................20,21

START-UP CHECKLIST ................CL-1,CL-2

SAFETY CONSIDERATIONS

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

Only trained, qualified installers and service mechanics

should install, start-up, and service this equipment (Fig. 1).

Untrained personnel can perform basic maintenance func­tions 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 allsafetycodes.Wear safetyglassesandworkgloves.
Keep quenching cloth and fire extinguisher nearby when braz­ing. Use care in handling, rigging, and setting bulky equip­ment.

ELECTRIC SHOCK HAZARD
Separate power sources (main and control

power circuits) are used for these units. Be
sure both main and control power circuits are
disconnected before servicing.

INSTALLATION

Step 1 — Complete Pre-Installation Checks

UNCRATE UNIT — Remove unit packaging except for the
top skid assembly, which should be left in place until after
the unit is rigged into its final location.

INSPECT SHIPMENT — File claim with shipping com­pany if shipment is damaged or incomplete.

CONSIDER SYSTEM REQUIREMENTS

• Consult local building codes and National Electrical Code

(NEC, U.S.A.) for special installation requirements.

• Allow sufficient space for airflow clearance, wiring,

refrigerant piping, and servicing unit. See Fig. 1. See
Fig. 2 for unit component locations.

• Locate unit so that outdoor coil (condenser) airflow is un-

restricted on all sides and above.

• Unit may be mounted on a level pad directly on the base

channels or mounted on raised pads at support points. See
Tables 1A-1D for unit operating weights. See
T able2forweightdistributionbasedonrecommendedsup­port points.

NOTE: If vibration isolators are required for a particular
installation, use the data in Table 2 to make the proper
selection.

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

Book 1 4
Tab 3a 2a

PC 111 Catalog No. 563-701 Printed in U.S.A. Form 38AKS-3SI Pg 1 9-98 Replaces: 38AKS-2SI

NOTE: Service areas — Allow 3 ft (914 mm) on both sides and 2 ft (610 mm)
on both ends of unit for servicing.

2

Fig. 1 — Dimensions

1324567

12 91011

LEGEND

1—No. 1 Fan 5—No. 2 Fan 9—Compressor
2—High-Pressure Switch 6—Terminal Block 1 (Unit Power) 10 — Low-Pressure Switch
3—Circuit Breaker — Control Circuit 7—Terminal Block 2 (Control Power) 11 — Hot Gas Bypass Piping Stub (
4—Circuit Breakers — Power Circuits 8—Wraparound Coil 12 — Muffler

Fig. 2 — Component Locations (Typical)

8

3

⁄8-in. ODM)

3

Table 1A — Physical Data (English, 60 Hz)

UNIT 38AKS 013 014 016 024
OPERATING WEIGHT (lb)

With Aluminum-Fin Coil 732 779 789 900
With Copper-Fin Coil 825 919 929 1040

REFRIGERANT* R-22

Shipping Charge (lb) 2.1 3.1 3.1 3.1
Operating Charge, Typical (lb)† 22 23 23 28

COMPRESSOR Reciprocating, Semi-Hermetic

Model 06DD824 06DD328 06DD537 06EA250
No. Cylinders 6664
Speed (rpm) 1750
Capacity Steps (%)

Accessory 33**,66,100 33**,66,100 33**,66,100 —
Standard 66,100 66,100 66,100 50,100

Crankcase Heater Watts 125
Unloader Setting (psig)

Load 70±1

Unload 60±2
OIL CHARGE (pt) 10 10 10 15.5
CONDENSER FANS Axial Flow, Direct Drive

Quantity...Diameter (in.) 2...26
Nominal Hp
Nominal Airflow (cfm, total) 11,000
Speed (rpm) 1,075
Watts (total) 1,460

CONDENSER COIL Copper Tubes, Aluminum Fins

Rows...Fins/in. 2...15 3...15 3...15 3...15
Total Face Area (sq ft) 29.2 29.2 29.2 29.2
Storage Capacity (lb)†† 27.2 40.3 39.8 39.8

CONTROLS

Pressurestat (psig)

High Pressure

Cutout 395±10
Cut-in 295±20

Low Pressure

Cutout 27±4
Cut-in 67+7

FAN CYCLING CONTROLS

No 2 Fan:

Close (psig) 255±10

Open (psig) 160±10
PRESSURE RELIEF Fusible Plug

Location Compressor Compressor Compressor Liquid Line
Temperature (F) 200 200 200 210

PIPING CONNECTIONS (in. ODM)

Suction 1
Liquid
Hot Gas Stub

*Unit is factory supplied with holding charge only.

†With 25 ft of interconnecting piping. Operating charge is approximate for maximum system capacity.

**Indicates capacity step (%) with electric unloader accessory.

††Storage capacity is measured at liquid saturated temperatures of 125 F for 38AKS013, 123 F for

38AKS014, and 130 F for 38AKS016 and 024.

1

⁄

8

13⁄

8

1

⁄

2

13⁄

5

⁄

8

3

⁄

8

8

15⁄

8

4

Table 1B — Physical Data (SI, 60 Hz)

UNIT 38AKS 013 014 016 024
OPERATING WEIGHT (kg)

With Aluminum-Fin Coil 332 353 358 408
With Copper-Fin Coil 374 417 421 472

REFRIGERANT* R-22

Shipping Charge (kg) 0.95 1.40 1.40 1.40
Operating Charge, Typical (kg)† 10.0 10.4 10.4 12.7

COMPRESSOR Reciprocating, Semi-Hermetic

Model 06DD824 06DD328 06DD537 06EA250
No. Cylinders 6664
Speed (r/s) 29.2
Capacity Steps

Accessory 33**,66,100 33**,66,100 33**,66,100 —
Standard 66,100 66,100 66,100 50,100

Crankcase Heater Watts 125
Unloader Setting (kPa)

Load 483 ± 6.9

Unload 414 ± 13.8
OIL CHARGE (L) 4.73 4.73 4.73 7.33
CONDENSER FANS Axial Flow, Direct Drive

Quantity...Diameter (mm) 2...660
Nominal kW 0.37
Nominal Airflow (L/s, total) 5566
Speed (r/s) 17.9
Watts (total) 1460

CONDENSER COIL Copper Tubes, Aluminum Fins

Rows...Fins/m 2...590 3...590 3...590 3...590
Total Face Area (sq m) 2.71 2.71 2.71 2.71
Storage Capacity (kg)†† 12.3 18.3 18.1 18.1

CONTROLS

Pressurestat (kPa)

High Pressure

Cutout 2724 ± 69
Cut-in 2034 ± 138

Low Pressure

Cutout 186 ± 28
Cut-in 462 + 48

FAN CYCLING CONTROLS

No 2 Fan:

Close (kPa) 1758 ± 69

Open (kPa) 1103±69
PRESSURE RELIEF Fusible Plug

Location Compressor Compressor Compressor Liquid Line
Temperature (C) 93.3 93.3 93.3 98.9

PIPING CONNECTIONS (in. ODM)

Suction 1
Liquid
Hot Gas Stub

*Unit is factory supplied with holding charge only.

†With 7.6mof interconnecting piping. Operatingchargeisapproximate for maximum systemcapacity.

**Indicates capacity step (%) with electric unloader accessory.

††Storage capacity is measured at liquid saturated temperatures of 51.7 C for 38AKS013, 50.6 C for

38AKS014, and 54.4 C for 38AKS016 and 024.

1

⁄

8

13⁄

8

5

⁄

8

3

⁄

8

13⁄

8

15⁄

8

5

Table 1C — Physical Data (English, 50 Hz)

UNIT 38AKS 013 014 016 024
OPERATING WEIGHT (lb)

With Aluminum-Fin Coil 732 779 789 900
With Copper-Fin Coil 825 919 929 1040

REFRIGERANT* R-22

Shipping Charge (lb) 2.1 3.1 3.1 3.1
Operating Charge, Typical (lb)† 22 23 23 28

COMPRESSOR Reciprocating, Semi-Hermetic

Model 06DD824 06DD328 06DD537 06EA250
No. Cylinders 6664
Speed (rpm) 1450
Capacity Steps

Accessory 33**,66,100 33**,66,100 33**,66,100 —
Standard 66,100 66,100 66,100 50,100

Crankcase Heater Watts 125
Unloader Setting (psig)

Load 70±1

Unload 60±2
OIL CHARGE (pt) 10 10 10 15.5
CONDENSER FANS Axial Flow, Direct Drive

Quantity...Diameter (in.) 2...26
Nominal Hp
Nominal Airflow (cfm, total) 9210
Speed (rpm) 900
Watts (total) 1050

CONDENSER COIL Copper Tubes, Aluminum Fins

Rows...Fins/in. 2...15 3...15 3...15 3...15
Total Face Area (sq ft) 29.2 29.2 29.2 29.2
Storage Capacity (lb)†† 27.2 40.3 39.8 39.8

CONTROLS

Pressurestat (psig)

High Pressure

Cutout 395±10
Cut-in 295±20

Low Pressure

Cutout 27±4
Cut-in 67+7

FAN CYCLING CONTROLS

No 2 Fan:

Close (psig) 255±10

Open (psig) 160±10
PRESSURE RELIEF Fusible Plug

Location Compressor Compressor Compressor Liquid Line
Temperature (F) 200 200 200 210

PIPING CONNECTIONS (in. ODM)

Suction 1
Liquid
Hot Gas Stub

*Unit is factory supplied with holding charge only.

†With 25 ft of interconnecting piping. Operating charge is approximate for maximum system capacity.

**Indicates capacity step (%) with electric unloader accessory.

††Storage capacity is measured at liquid saturated temperatures of 125 F for 38AKS013, 123 F for

38AKS014, and 130 F for 38AKS016 and 024.

1

⁄

8

13⁄

8

1

⁄

2

13⁄

5

⁄

8

3

⁄

8

8

15⁄

8

6

Table 1D — Physical Data (SI, 50 Hz)

UNIT 38AKS 013 014 016 024
OPERATING WEIGHT (kg)

With Aluminum-Fin Coil 332 353 358 408
With Copper-Fin Coil 374 417 421 472

REFRIGERANT* R-22

Shipping Charge (kg) 0.95 1.40 1.40 1.40
Operating Charge, Typical (kg)† 10.0 10.4 10.4 12.7

COMPRESSOR Reciprocating, Semi-Hermetic

Model 06DD824 06DD328 06DD537 06EA250
No. Cylinders 6664
Speed (r/s) 24.2
Capacity Steps

Accessory 33**,66,100 33**,66,100 33**,66,100 —
Standard 66,100 66,100 66,100 50,100

Crankcase Heater Watts 125
Unloader Setting (kPa)

Load 483 ± 6.9

Unload 414 ± 13.8
OIL CHARGE (L) 4.73 4.73 4.73 7.33
CONDENSER FANS Axial Flow, Direct Drive

Quantity...Diameter (mm) 2...660
Nominal kW 0.37
Nominal Airflow (L/s, total) 4660
Speed (r/s) 15.0
Watts (total) 1050

CONDENSER COIL Copper Tubes, Aluminum Fins

Rows...Fins/m 2...590 3...590 3...590 3...590
Total Face Area (sq m) 2.71 2.71 2.71 2.71
Storage Capacity (kg)†† 12.3 18.3 18.1 18.1

CONTROLS

Pressurestat (kPa)

High Pressure

Cutout 2724 ± 69
Cut-in 2034 ± 138

Low Pressure

Cutout 186 ± 28
Cut-in 462 + 48

FAN CYCLING CONTROLS

No 2 Fan:

Close (kPa) 1758 ± 69

Open (kPa) 1103±69
PRESSURE RELIEF Fusible Plug

Location Compressor Compressor Compressor Liquid Line
Temperature (C) 93.3 93.3 93.3 98.9

PIPING CONNECTIONS (in. ODM)

Suction 1
Liquid
Hot Gas Stub

*Unit is factory supplied with holding charge only.

†With 7.6mof interconnecting piping. Operatingchargeisapproximate for maximum systemcapacity.

**Indicates capacity step (%) with electric unloader accessory.

††Storage capacity is measured at liquid saturated temperatures of 51.7 C for 38AKS013, 50.6 C for

38AKS014, and 54.4 C for 38AKS016 and 024.

1

⁄

8

13⁄

8

5

⁄

8

3

⁄

8

13⁄

8

15⁄

8

7

Table2—Weight Distribution

WEIGHT

UNIT

38AKS

013 732 332 94 43 93 42 93 42 149 68 151 68 152 69
013C 825 374 119 54 116 53 115 52 157 71 159 72 159 72
014 779 353 95 43 94 43 94 43 164 74 166 75 166 75
014C 919 417 131 59 129 59 128 58 176 80 177 80 178 81
016 789 358 95 43 95 43 96 44 167 76 168 76 168 76
016C 929 421 131 59 130 59 130 59 178 81 180 82 180 82
024 900 408 119 54 114 52 113 51 179 81 185 84 190 86
024C 1040 472 155 70 150 68 146 66 191 87 196 89 202 92

Total

Operating

lb kg lb kg lb kg lb kg lb kg lb kg lb kg

ABCDEF

Support Point

Step 2 — Rig and Mount the Unit

Be sure unit panels are securely in place prior to
rigging.

RIGGING — These units are designed for overhead rigging
only. For this purpose, the transverse base channels extend
beyond the sides of the unit, with holes provided in the end
plates to attach cables or hooks. Rig with top skid packaging
assembly in place to prevent unit damage by the rigging cable.
As further protection for the coil faces, plywood sheets can
be placed against the sides of the unit, behind the cables.
Run the cables to acentral suspension point so that the angle
from the horizontal is not less than 45 degrees. Raise and set
the unit down carefully.

If it is necessary to roll the unit into position, mount
the unit on longitudinal rails, using a minimum of 3 rollers.
Apply force to the rails, not the unit. If the unit is to be skid­ded into position, place it on a large pad and drag it by the
pad. Do not apply any force to the unit.

Raise from above to lift unit from the rails or pad when
unit is in final position.

COMPRESSOR MOUNTING — As shipped, the compres­sor is held tightly in place by self-locking bolts. Before start-

ing unit, loosen self-locking bolts until the snubber washer
can be moved sideways with finger pressure. Do not
remove shipping bolts. See Fig. 3.

Step 3 — Complete Refrigerant Piping
Connections

IMPORTANT:A refrigerant receiver is not provided with
the unit. Do not install a receiver.

SIZE REFRIGERANT LINES — Consider the length of pip­ing required between outdoor unit and indoor unit (evapo­rator), the amount of liquid lift, and compressor oil return.
See Tables 3-5B and also refer to Part 3 of Carrier System
Design Manual and E20-IIt software for design details and
line sizing. Refer to indoor unit installation instructions for
additional information.

NOTE: Use the piping data in Tables3-5Bas a general guide
only. For more precise calculations, refer to Carrier System
Design manual or E20-II software.

Condensing units with multiple-step unloading may
require double suction risers to assure proper oil return at
minimum load operating condition. See Tables 4A-5B and
Fig. 4. Reduction of evaporator coil surface should be ana­lyzed to provide sufficient refrigerant velocity to return oil
to the compressor. Liquid line solenoid valves may be used
in certain situations to accomplish this. Hot gas bypass, if
used, should be introduced before the evaporator.

Note that refrigerant suction piping should be insulated.

Table 3 — Liquid Line Data

MAXIMUM

ALLOWABLE

LIQUID LIFT

UNIT

38AKS

013 52 (15.8)

014 67 (20.4)

016 82 (25.0

024 87 (26.5) 86 (26)

*Inlet and outlet.
NOTE: Data shown is for units operating at 45 F (7.2 C) saturated

suction and 95 F (35 C) entering air.

ft (m)

60 Hz 50 Hz

Maximum
Allowable

Pressure

Drop

psig (kPa)

7 (48.3) 2 (1.1)

LIQUID LINE

Maximum
Allowable

Temp.

Loss
F (C)

Filter Drier

and

Sight Glass

Flare Conn.*

in. (mm)

5

⁄8(15.88)

Fig. 3 — Compressor Mounting

8