McQuay ACU018ARBY Installation Manual

Installation and Maintenance Manual IM-800

Group: Unitary

Part Number: IM-800

Date: August 2005

Supersedes: January 2005

ACU Split System Air Conditioners

1-1/2 to 5 ton

© 2004 McQuay International

IM-800 Page 1

Table of Contents

NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Receiving Inspection . . . . . . . . . . . . . . . . . . . . . . . . . 4

Codes and Regulations . . . . . . . . . . . . . . . . . . . . . . . . 4

Important Message to the Installer . . . . . . . . . . . . . . . 4

Important Message to the Owner . . . . . . . . . . . . . . . . 4

Recognize Safety Symbols, Words, and Labels . . . . 4

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

GENERAL WARNINGS . . . . . . . . . . . . . . . . . . . . . . . 5

CLEARANCES AND ACCESSIBILITY . . . . . . . . . . . 5

LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

ELECTRICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

REFRIGERANT TUBING . . . . . . . . . . . . . . . . . . . . . 6

EVAPORATOR COIL . . . . . . . . . . . . . . . . . . . . . . . . . 6

Field Connection to the Valve and Valve Opening . . . 6

QUICK CONNECT COILS . . . . . . . . . . . . . . . . . . . . . 7

Precharged System Installation . . . . . . . . . . . . . . . . . 7

SYSTEM START UP . . . . . . . . . . . . . . . . . . . . . . . . . 7

Processing Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

CHARGE CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Capillary Tube/Fixed Orifice System. . . . . . . . . . . . . . 8

Superheat Determination . . . . . . . . . . . . . . . . . . . . . . 8

Expansion Valve System . . . . . . . . . . . . . . . . . . . . . . 8

WIRING DIAGRAM - SINGLE PHASE . . . . . . . . . . . 9

WIRING DIAGRAM - THREE PHASE . . . . . . . . . . . 10

"McQuay" is a registered trademark of McQuay International.

© 2004 McQuay International

"Illustrations and information cover the McQuay International products at the time of publication and we reserve the right to make changes in

Page 2 IM-800

design and construction at any time without notice."

MODEL NOMENCLATURE

Model

ACU = Air Cooled Cooling Unit

Nominal Capacity (tons)

18 = 1-1/2
24 = 2
36 = 3
42 = 3-1/2
48 = 4
49 = 4
60 = 5
61 = 5
62 = 5

* 10 SEER Size 036, 049 and 060 only.
**10 SEER Size 060 only.

Table 1: Unit Nameplate Model Number Identifier

Unit Nameplate McQuay Model Number

CKL18-1L ACU018ARAY
CKL24-1L ACU024ARAY
CKL30-1L ACU030ARAY
CKL36-1L ACU036ARAY
CKL36-3L ACU036APAY
CKL42-1L ACU042ARAY
CKL49-1L ACU049ARAY
CKL49-3L ACU049APAY
CKL60-1L ACU060ARAY
CKL60-3L ACU060APAY
CKL60-4L ACU060AQAY
CKL62-1L ACU062ARAY
CLJ18-1C ACU018ARBY
CLJ24-1C ACU024ARBY
CLJ30-1C ACU030ARBY
CLJ36-1C ACU036ARBY
CLJ42-1C ACU042ARBY
CLJ48-1C ACU048ARBY
CLJ60-1C ACU060ARBY
CLT24-1B ACU024ARCY
CLT30-1B ACU030ARCY
CLT36-1B ACU036ARCY
CLT42-1B ACU042ARCY
CLT48-1B ACU048ARCY

CLT60-1B ACU060ARCY
CLQ24-1B ACU024ARDY
CLQ30-1B ACU030ARDY
CLQ36-1B ACU036ARDY
CLQ42-1B ACU042ARDY
CLQ48-1B ACU048ARDY
CLQ60-1B ACU060ARDY

ACU 018

A

RAY

Future Use

SEER

A = 10
B = 12
C = 13
D = 14

Voltage/Phase

P = 208-230/3/60*
Q = 460/3/60**
R = 208-230/1/60

Vintage

IM-800 Page 3

INTRODUCTION

General Description

These installation instructions cover the outdoor installation of
cooling only split systems from ½ to 5 tons. See the product
catalog applicable to your model for information regarding
specifications applicable to your model and accessories.

Receiving Inspection

McQuay products are carefully inspected prior to shipment
and the carrier has assumed responsibility for loss or damage
upon acceptance of the shipment.

Upon receiving your shipment, check all items carefully
against the Bill of Lading. Inspect the unit and/or accessories
for shipping damage as soon as they are received. Immedi­ately file claims for loss or damage, either shipping or con­cealed, with the shipping company.

Check the unit nameplate to verify the model number and elec­trical characteristics are correct. In the event an incorrect unit
is shipped, it must be returned to the supplier and must NOT
be installed. The manufacturer disclaims all responsibility for
the installation of incorrectly shipped units.

Codes and Regulations

This product is designed and manufactured to permit installa­tion in accordance with National Codes. System design
should, where applicable, follow information presented in
accepted industry guides such as the ASHRAE Handbooks. It
is the installer' s responsibility to install the product in accor­dance with National Codes and/or prevailing local codes and
regulations. The manufacturer disclaims all responsibility for
equipment installed in violation of any code or regulations.

Important Message to the Owner

Read these instructions carefully and keep them near the prod­uct for future reference. Although these instructions are
addressed primarily to the installer, useful maintenance infor­mation is included. Have the installer acquaint you with the
operation of the product and periodic maintenance require­ments.

Recognize Safety Symbols, Words, and Labels

The following symbols and labels are used throughout this
manual to indicate immediate or potential hazards. It is the
owner's and installer's responsibility to read and comply with
all safety information and instructions accompanying these
symbols. Failure to heed safety information increases the risk
of property damage and/or product damage, serious personal
injury or death. Improper installation, operation and mainte­nance can void the warranty.

DANGER

Immediate hazards which WILL result in property
damage, product damage, severe personal injury and/
or death.

WARNING

Hazards or unsafe practice CAN result in property
damage, product damage, sever personal injury and/or
death.

IMPORTANT

The United States Environmental Protection Agency
(EPA) regulations cover introduction and disposal of
refrigerants in this unit. Failure to follow those
regulations can harm the environment and lead to
substantial fines. Because regulations can change over
time, a certified technician should perform any work
done on this unit. If you have any questions, please
contact the local office of the EPA.

Important Message to the Installer

This equipment is to be installed by an experienced installation
company and fully trained personnel. Carefully read all
instructions and take into account any special considerations
prior to installing the unit. Give this manual to the owner and
explain its provisions.

CAUTION

Hazards or unsafe practices which CAN result in
property damage, product damage, and/or personal
injury.

Replacement Parts

Replacement parts can be obtained by contacting McQuay at
1

-800-37-PARTS. When contacting McQuay for service or
replacement parts, refer to the model number and serial num­ber of the unit as stamped on the nameplate attached to the
unit.

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