McQuay ACU090AQEY Installation Manual

Installation and Maintenance Manual IM-802

Group: Unitary

Part Number: IM-802

Date: August 2005

Supersedes: March 2005

ACU Split System Air Conditioners

7-1/2 & 10 TON

© 2004 McQuay International

IM-802 Page 1

Table of Contents

MODEL NOMENCLATURE . . . . . . . . . . . . . . . . . . . . 3

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

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

PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . 6

DUCTWORK CONSIDERATIONS . . . . . . . . . . . . . . . 6

SITE SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

TYPICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . 7

RIGGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

UNIT CORNER WEIGHT . . . . . . . . . . . . . . . . . . . . . . 7

REFRIGERANT TUBING . . . . . . . . . . . . . . . . . . . . . . 7

ELECTRICAL WIRING . . . . . . . . . . . . . . . . . . . . . . . 9

SYSTEM EVACUATION AND CHARGING . . . . . . 10

SYSTEM EVACUATION . . . . . . . . . . . . . . . . . . . . . 11

PRELIMINARY CHARGE ADJUSTMENT . . . . . . . . 12

FINAL CHARGE ADJUSTMENT . . . . . . . . . . . . . . . 12

EXPANSION VALVE INDOOR COILS . . . . . . . . . . 12

TROUBLE SHOOTING . . . . . . . . . . . . . . . . . . . . . . 13

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . 14

"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-802

design and construction at any time without notice."

MODEL NOMENCLATURE

M

A

N

0
1

0

A

odel

CU = Air Cooled Cooling Unit

ominal Capacity (tons)

90 = 7-1/2
20 = 10

Table 1: Unit Nameplate Model Number Identifier

Unit Nameplate McQuay Model Number

CKL090-3L ACU090APEY
CKL090-4L ACU090AQEY
CKL120-3L ACU120APEY
CKL120-4L ACU120AQEY

ACU 090

PEY

Future Use
EER

E = 10.3

Voltage/Phase

P = 208-230/3/6
Q = 460/3/60

Vintage

IM-802 Page 3

INTRODUCTION

General Description

These installation instructions cover the outdoor installation of
cooling only condensing units from 7½ to 10 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

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, 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.

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 mainte-

nance 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.

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.

Page 4 IM-802

GENERAL WARNINGS

WARNING

Before servicing or installing the electrical power must
be in OFF. More than one disconnect may exist.
Failure to disconnect all power can cause electrical
shock, serious personal injury or death.

WARNING

The unit must have an uninterrupted, unbroken
electrical ground. Failure to properly ground can cause
severe personal injury or death.

WARNING

Installation and service by trained, qualified technicians
only. High pressure and electricity can cause severe
personal injury or death. Observe ALL warnings
contained in this manual and the labels/tags attached to
the equipment.

WARNING

When installing or servicing, wear protective gloves,
gear and eyeware. Also observe special safety
requirements (hard hats etc.).

CCAUTION

To protect the unit when welding close to the painted
surfaces, use a quenching cloth to prevent scorching or
marring of equipment finish.

CCAUTION

Read these instructions before performing this
installation or servicing this unit. All installations must
be in accordance with all national, state, or local
building codes.

IM-802 Page 5