Installation, Start-Up and

Service Instructions

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 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 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 operating weights. See

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.

38AKS013-024

Air-Cooled Condensing Units

50/60 Hz

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

Carrier 38AKS013-024 - Page 5

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