Table of Contents
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CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Step 1 - Complete Pre-Installation
Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Step 2 - Rig and Mount the Unit . . . . . . . . . . . . . 8
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Step 4 - Install Accessories . . . . . . . . . . . . . . . . 10
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 Guard 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 equip-
ment can be hazardous due to system pressures, electrical
components, and equipment location (roofs, elevated struc-
tures, etc.).
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
PC 111
Catalog No. 563-701
Tab
3a 2a
Installation, Start-Up and
Service Instructions
Page
Printed in U.S.A.
Air-Cooled Condensing Units
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 braz-
ing. Use care in handling, rigging, and setting bulky equip-
ment.
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 com-
pany 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
Table 2 for weight distribution based on recommended sup-
port points.
NOTE: If vibration isolators are required for a particular
installation, use the data in Table 2 to make the proper
selection.
Form 38AKS-3SI
Pg 1
38AKS013-024
50/60 Hz
operating
weights.
See
9-98
Replaces: 38AKS-2SI
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Related Manuals for Carrier 38AKS013-024
Summary of Contents for Carrier 38AKS013-024
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Page 1: Table Of Contents
Table 2 for weight distribution based on recommended sup- port points. NOTE: If vibration isolators are required for a particular installation, use the data in Table 2 to make the proper selection. Printed in U.S.A. Form 38AKS-3SI 38AKS013-024 50/60 Hz unit operating weights. Pg 1 9-98... - Page 2 NOTE: Service areas — Allow 3 ft (914 mm) on both sides and 2 ft (610 mm) on both ends of unit for servicing. Fig. 1 — Dimensions...
- Page 3 1 — No. 1 Fan 2 — High-Pressure Switch 3 — Circuit Breaker — Control Circuit 4 — Circuit Breakers — Power Circuits Fig. 2 — Component Locations (Typical) LEGEND 5 — No. 2 Fan 6 — Terminal Block 1 (Unit Power) 7 —...
- Page 4 UNIT 38AKS OPERATING WEIGHT (lb) With Aluminum-Fin Coil With Copper-Fin Coil REFRIGERANT* Shipping Charge (lb) Operating Charge, Typical (lb)† COMPRESSOR Model No. Cylinders Speed (rpm) Capacity Steps (%) Accessory Standard Crankcase Heater Watts Unloader Setting (psig) Load Unload OIL CHARGE (pt) CONDENSER FANS Quantity...Diameter (in.) Nominal Hp...
- Page 5 UNIT 38AKS OPERATING WEIGHT (kg) With Aluminum-Fin Coil With Copper-Fin Coil REFRIGERANT* Shipping Charge (kg) Operating Charge, Typical (kg)† COMPRESSOR Model No. Cylinders Speed (r/s) Capacity Steps Accessory Standard Crankcase Heater Watts Unloader Setting (kPa) Load Unload OIL CHARGE (L) CONDENSER FANS Quantity...Diameter (mm) Nominal kW...
- Page 6 UNIT 38AKS OPERATING WEIGHT (lb) With Aluminum-Fin Coil With Copper-Fin Coil REFRIGERANT* Shipping Charge (lb) Operating Charge, Typical (lb)† COMPRESSOR Model No. Cylinders Speed (rpm) Capacity Steps Accessory Standard Crankcase Heater Watts Unloader Setting (psig) Load Unload OIL CHARGE (pt) CONDENSER FANS Quantity...Diameter (in.) Nominal Hp...
- Page 7 UNIT 38AKS OPERATING WEIGHT (kg) With Aluminum-Fin Coil With Copper-Fin Coil REFRIGERANT* Shipping Charge (kg) Operating Charge, Typical (kg)† COMPRESSOR Model No. Cylinders Speed (r/s) Capacity Steps Accessory Standard Crankcase Heater Watts Unloader Setting (kPa) Load Unload OIL CHARGE (L) CONDENSER FANS Quantity...Diameter (mm) Nominal kW...
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Page 8: Step 2 - Rig And Mount The Unit
(evapo- rator), 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-II software for design details and line sizing. - Page 9 Table 4A — Refrigerant Piping Sizes — 60 Hz Units LENGTH OF INTERCONNECTING PIPING, FT (M) 0-15 15-25 25-50 UNIT (0-4.5) (4.5-7.5) (7.5-15) 38AKS Line Size (in. OD) ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄...
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Page 10: Step 4 - Install Accessories
INSTALL FILTER DRIER(S) AND MOISTURE INDICA- TOR(S) — Every unit should have a filter drier and liquid- moisture indicator (sight glass). In some applications, depending on space and convenience requirements, it may be desirable to install 2 filter driers and sight glasses. One filter drier and sight glass may be installed at A locations in Fig. - Page 11 LEGEND EQUIP GND — Equipment Ground — National Electrical Code Factory Wiring Field Wiring Fig. 7 — Main Power Supply Wiring Volts UNIT 38AKS Model Supplied* Nameplate 208-230 208-230 208-230 208-230 LEGEND — Full Load Amps (Fan Motors) — Maximum Instantaneous Current Flow during start-up (LRA of compressor plus total FLA of fan motors) —...
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Page 12: Pre-Start-Up
Volts UNIT 38AKS Model Supplied* Nameplate LEGEND — Full Load Amps (Fan Motors) — Maximum Instantaneous Current Flow during start-up (LRA of compressor plus total FLA of fan motors) — Total Fan Motor Input (kilowatts) — Locked Rotor Amps — Minimum Circuit Amps per NEC (U.S.A.), Section 430-24 MOCP —... -
Page 13: Start-Up
Run compressor for 20 minutes and check oil level. See Fig. 9. NOTE: Use only Carrier approved compressor oil. Ap- proved sources are: Petroleum Specialties Inc....Cryol 150A Texaco, Inc. - Page 14 Fig. 10 — 38AKS013 and 38AKS024 Charging Chart...
- Page 15 Fig. 11 — 38AKS014 Charging Chart...
- Page 16 Fig. 12 — 38AKS016 Charging Chart...
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Page 17: Operating Sequence
OPERATING SEQUENCE Cooling — When the first stage (TC1) of the cooling ther- mostat closes, the timer starts. After approximately 3 seconds, the timer expires, energizing the compressor and fan motor no. 1. When the liquid pressure builds to approxi- mately 257 psig (1772 kPa), fan motor no. -
Page 18: Winter Start Control
Winter Start Control (If Required) — cessory Package 38AE900021. Crankcase Heater — The heater prevents refrigerant migration and compressor oil dilution during shutdown when- ever compressor is not operating. It is wired to cycle with the compressor; the heater is off when compressor is run- ning, and on when compressor is off. - Page 19 Fig. 15 — Outdoor Fan Fig. 17 — Coil Cleaning (Typical) Fig. 16 — Pivot and Support Top Cover...
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Page 20: Troubleshooting
PROBLEM COMPRESSOR DOES NOT RUN Contactor Open 1. Power off. 2. Fuses blown in field power circuit. 3. No control power. 4. Thermostat circuit open. 5. Time Guard II device not operating. 6. Compressor circuit breaker tripped. 7. Safety device lock-out circuit active. 8. -
Page 21: Troubleshooting
PROBLEM COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH (cont) Airflow Restricted 1. Coil iced up. 2. Coil dirty. 3. Air filters dirty. 4. Dampers closed. Indoor-Air Fan Stopped 1. Electrical connections loose. 2. Fan relay defective. 3. Motor overload open. 4. Motor defective. 5. - Page 22 Copyright 1998 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 PC 111 Catalog No. 563-701 Printed in U.S.A. Form 38AKS-3SI Pg 22 9-98...
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Page 23: Start-Up Checklist
A. Preliminary Information OUTDOOR: MODEL NO. INDOOR: AIR HANDLER MANUFACTURER MODEL NO. ADDITIONAL ACCESSORIES B. Pre-Start-Up OUTDOOR UNIT IS THERE ANY SHIPPING DAMAGE? IF SO, WHERE: WILL THIS DAMAGE PREVENT UNIT START-UP? CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT? HAS THE GROUND WIRE BEEN CONNECTED? HAS THE CIRCUIT PROTECTION BEEN SIZED AND INSTALLED PROPERLY? ARE THE POWER WIRES TO THE UNIT SIZED AND INSTALLED PROPERLY? - Page 24 CHECK THE COMPRESSOR OIL LEVEL SIGHT GLASSES; ARE THE SIGHT GLASSES SHOWING OIL LEVEL IN VIEW? (Y/N) NOTES: Copyright 1998 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 PC 111 Catalog No.