Carrier 38AKS013-024 Specifications download pdf

Wiring Diagrams

Units Produced After January 1996

INDEX

UNIT

38AKS

ELECTRICAL

CHARACTERISTICS

(V-Ph-Hz)

SCHEMATIC

DIAGRAM

FIG. NO.

COMPONENT

ARRANGEMENT

FIG. NO.

LABEL DIAGRAM

(On Unit)

NO. 38AK

013-024

208/230-3-60 1 2 501206

380-3-60 1 2 501206

230-3-50 1 2 501206

346-3-50* 1 2 501206

400-3-50 1 2 501206

460-3-60 3 4 501207

575-3-60 3 4 501207

*38AKS024 only.

Remote Thermostat Wiring ....................................................Fig. 5

Programmable Electronic Thermostat Wiring ........................................Fig. 6

Accessory Transformer Relay Package ........................................... Fig. 7

Accessory Winter Start Package ................................................Fig. 8

Motormaster® Control Diagrams ..............................................Fig. 9-15

SAFETY CONSIDERATIONS

Installation, start-up, and servicing of this equipment can

be hazardous due to system pressures, electrical compo-

nents, and equipment location (roofs, elevated structures, etc.)

Only trained, qualiﬁed installers and service mechanics

should install, start up, and service this equipment.

When working on the equipment, observe precautions in

the literature, tags, stickers, and labels attached to the equip-

ment, and any other safety precautions that apply.

• Follow all safety codes.

• Wear safety glasses and work gloves.

• Use care in handling, rigging, and setting bulky equipment.

• Use care in handling electronic components.

ELECTRIC SHOCK HAZARD

Open all remote disconnects before servicing

this equipment.

OPERATING SEQUENCE

Cooling—

When the ﬁrst stage (TC1) of the cooling ther-

mostat closes, the timer starts. After approximately

3 seconds, the timer activates the compressor and fan

motor no. 1. When the liquid pressure builds to approxi-

mately 260 psig (1793 kPa), fan motor no. 2 is energized.

On demand for additional cooling capacity, the second stage

(TC2) of the cooling thermostat closes, energizing a ﬁeld-

supplied liquid line solenoid valve (LLSV), which opens.

This increases the suction pressure, causing the compressor

to operate at higher capacity.

When fan switch is set at AUTO, the indoor-air fan cycles

with the compressor. When the switch is set at CONT, the

indoor-air fan runs continuously.

At shutdown, the Time Guard® II timer prevents the com-

pressor from restarting for approximately 5 minutes.

In addition, a ﬁeld-supplied solenoid valve (locate at fan

coil) wired in parallel with the compressor contactor coil,

shuts off the liquid line to prevent the refrigerant migration

back to the compressor during the off cycle. This valve is

recommended for all installations and is mandatory if piping

length is over 75 ft (22.9 m) or if liquid line diameter ex-

ceeds

⁄

in. (38AKS013, 014) or

⁄

in. (38AKS016, 024). If

two liquid line solenoid valves are used, add accessory relay-

transformer package 38AE900001 (60 Hz only).

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. 563-820 Printed in U.S.A. Form 38AKS-2W Pg 1 8-96 Replaces: New

1 2 3 4 5 6 ... 15 16

Summary of Contents

Page 1 - Wiring Diagrams

Wiring DiagramsUnits Produced After January 1996INDEXUNIT38AKSELECTRICALCHARACTERISTICS(V-Ph-Hz)SCHEMATICDIAGRAMFIG. NO.COMPONENTARRANGEMENTFIG. NO.LA

Page 2 - NOTES (Fig. 1-4)

DIMENSIONS (ft-in.)BAFFLE LOCATIONS ARight-Hand Side* 2-511⁄16Back 5-81⁄8Left-Hand Side* 3-07⁄16*As viewed from access panel side.Fig. 10 — Wind Baffl

Page 3 - SCHEMATIC

Installation— After completing the pre-installation steps,proceeds as follows:MOUNT CONTROL ASSEMBLY1. See Fig. 11 for the location of the access pane

Page 4 - COMPONENT ARRANGEMENT

INSTALLCONTROLPOWER WIRING — Wire the Motor-master® low-ambient control to the unit’s power circuit asshown in Fig. 14 and 15; refer to the following

Page 5

DRILL 4 HOLES.156"-.154" [4 mm] DIAM NO. 23 DRILLBOTTOM OF CONTROL (ALL VOLTAGES EXCEPT 460V)CUT ALONG SOLID BORDER LINES TO

Page 6 - 2-Step Cooling/2-Step Heating

Page 7

Page 8

Page 9 - Pre-Installation

Heating — If heating is desired, a heating/cooling ther-mostat (See Fig. 5-7) must be supplied. This thermostat en-ergizes a ﬁeld-supplied relay, whic

Page 10 - Fig. 10 — Wind Baffle Details

Fig. 1 — Power and Control Circuit Schematics; 208/230, 380-3-60; 230, 346, 400-3-50SCHEMATIC3

Page 11

Fig. 2 — Component Arrangement; 208/230, 380-3-60; 230, 346, 400-3-50COMPONENT ARRANGEMENT4

Page 12

Fig. 3 — Power and Control Circuit Schematics; 460, 575-3-60SCHEMATIC5

Page 13

Fig. 4 — Component Arrangement; 460, 575-3-60NOTES:1. Combination LLSV2 plus IFC vashould not exceed 30 va.2. Do not exceed 5 va (24 vac)per coil R1.}

Page 14

LEGENDC—Compressor ContactorHD — Heating DeviceIFC — Indoor Fan ContactorLLSV — Liquid Line Solenoid ValveR—Heat Control Relay (ﬁeld-supplied, 24-volt

Page 15

LEGENDC—Compressor Contactor LLSV — Liquid Line Solenoid ValveCM — Common R—Accessory Relay (Field-Supplied)HD — Heat Device SVR — Solenoid Valve Rela

Page 16 - Tab 3a 2a

MOTORMASTER® CONTROL(LOW AMBIENT KIT)INSTALLATIONThe accessory low-ambient kit contains a fan speed (Motor-master) control device activated by a tempe