McQuay SAH090APTY Installation Manual

Installation and Maintenance Manual IM-809

SAH Air Handler

7-1/2 and 10 Tons

Group: Unitary

Part Number: IM-809

Date: August 2005

Supersedes: July 2005

© 2004 McQuay International

IM-809 Page 1

Table of Contents

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

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

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

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

ORIENTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ELECTRICAL SUPPLY WIRE AND MOP . . . . . . . . . . . . . . 8

CONVERSION TO 460V ELECTRICAL POWER SUPPLY 9

ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . .10

HEAT KIT INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . 11

REFRIGERANT LINES . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

EVAPORATOR COIL TXV . . . . . . . . . . . . . . . . . . . . . . . . . 12

AIRFLOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

BELT TENSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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-809

design and construction at any time without notice."

MODEL NOMENCLATURE

M

S

g

*

odel

AH= Split Air Handler Unit

Nominal Capacity (tons)

090 = 7-1/2
120 = 10

SAH090 and 120 units are field-convertible to 460/3/60 voltage.

Table 1: Unit Nameplate Model Number Identifier

Unit Nameplate McQuay Model Number

AR090 SAH090APTY
AR120 SAH120APTY

SAH 090

A

PTY

Future Use
Refrigerant Meterin

T = TXV

Voltage/Phase

P = 208-460/3/60*

Vintage

IM-809 Page 3

INTRODUCTION

General Description

These installation instructions cover the indoor installation of
AR series electric split system cooling and heat pump air han­dlers. See the product catalog 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.

The SAH evaporator coil contains a high-pressure inert gas
holding charge. Before installing the unit, depress the liquid
line Schrader fitting(s) to verify the integrity of the evaporator
coil. Note that SAH120 units have two (2) liquid line Schrader
valves, both of which should be depressed.

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 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 or 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.

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.

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GENERAL WARNINGS

WARNING

Verify that all power is disconnected prior to installing
of this equipment. There may be more than one
disconnect servicing this equipment.

WARNING

Before servicing or installing this equipment, the
electrical power to this unit must be in the "OFF"
position. More than one disconnect may exist. Failure
to disconnect 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

This product is factory shipped for use with a 208-230/
3/60 electrical power supply. However, the air handler
can be reconfigured to operate with a 460/3/60 power
supply provided the conversion noted in the
"Conversion to 460 Electrical Supply" section of this
manual is performed. Failure to observe this warning
can result in personal injury, equipment damage and
fire.

WARNING

This air handler is designed for Upflow or Horizontal ­Left applications. DO NOT INSTALL IN THE
DOWNFLOW OR HORIZONTAL-RIGHT
ORIENTATION.

WARNING

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

CAUTION

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

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