McQuay SAH024ARTY Installation Manual

Installation and Maintenance Manual IM-810

SAH Air Handler

1-1/2 to 5 Tons

Group: Unitary

Part Number: IM-810

Date: August 2005

Supersedes: March 2005

© 2005 McQuay International

IM-810 Page 1

Table of Contents

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1
2
3
3
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4
4
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6
61 = 5

g

MODEL NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . 2

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Receiving Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Codes and Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Important Message to the Installer . . . . . . . . . . . . . . . . . . . . 3

Important Message to the Owner . . . . . . . . . . . . . . . . . . . . 3

Recognize Safety Symbols, Words, and Labels . . . . . . . . . . 3

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

GENERAL WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

ELECTRIC HEAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

HKR INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

For All Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

ELECTRICAL SUPPLY WIRE AND MOP . . . . . . . . . . . . . . 6

Inspection of the Building Electrical Service . . . . . . . . . . . . . 6

Wire Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Maximum Overcurrent Protection (MOP) . . . . . . . . . . . . . . . 7

Electrical Connections – Supply Voltage . . . . . . . . . . . . . . . 7

Air Handler Only (Non-Heat Kit Models) . . . . . . . . . . . . . . . .7

Air Handler With Non-Circuit Breaker Heat Kits . . . . . . . . . .7

Air Handler With Heat Kits Containing a Circuit Breaker. . . .7

Low Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . .7

REFRIGERANT LINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Tubing Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Post Brazing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Piping Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Evaporator Coil Metering Devices . . . . . . . . . . . . . . . . . . . . .7

Conversion to Downflow. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Conversion To Horizontal . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Condensate Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

ACHIEVING A 2% LOW LEAKAGE RATE . . . . . . . . . . . . .10

Humidity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Two-Stage Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

THERMOSTAT WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Thermostats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Regular Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

"McQuay" is a registered trademark of McQuay International.

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

design and construction at any time without notice."

© 2005 McQuay International

MODEL NOMENCLATURE

SAH 018

odel

AH= Split Air Handler Unit

ominal Capacity (tons)

8 = 1-1/2
4 = 2
0 = 2-1/2
2 = 2-1/2
6 = 3
2 = 3-1/2
8 = 4
9 = 4
0 = 5

Page 2 IM-810

A

RFY

Future Use
Refrigerant Meterin

F = Flowrater
T = TXV

Voltage/Phase

R = 208-230/1/60

Vintage

Table 1: Unit Nameplate Model Number Identifier

Unit Nameplate McQuay Model Number

ARUF018-00A-1/-1A SAH018ARFY
ARUF024-00A-1/-1A SAH024ARFY
ARUF030-00A-1/-1A SAH030ARFY
ARUF032-00A-1/-1A SAH032ARFY
ARUF036-00A-1/-1A SAH036ARFY
ARUF042-00A-1/-1A SAH042ARFY
ARUF048-00A-1/-1A SAH048ARFY
ARUF049-00A-1/-1A SAH049ARFY
ARUF060-00A-1/-1A SAH060ARFY

ARUF061-00A-1/-1A SAH061ARFY
ARPT024-00C-1/00C-1A SAH024ARTY
ARPT032-00C-1/00C-1A SAH032ARTY
ARPT036-00C-1/00C-1A SAH036ARTY
ARPT042-00C-1/00C-1A SAH042ARTY
ARPT049-00C-1/00C-1A SAH049ARTY
ARPT061-00C-1/00C-1A SAH061ARTY

INTRODUCTION

General Description

These installation instructions cover the indoor installation of
1-1/2 to 5 ton multi-position 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.

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 mainte­nance can void the warranty.

IM-810 Page 3

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.

GENERAL WARNINGS

WARNING

This product is factory shipped for use with a 208-230/
1/60 electrical power supply. This air handler must not
be reconfigured to operate with any other power supply.
Failure to observe this warning may result in personal
injury, equipment damage and fire.

WARNING

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

PRODUCT DESCRIPTION

These air handlers are designed to be installed in upflow,
downflow, and horizontal right orientations.

These air handlers are designed for indoor use only and must
only be installed in a weatherized area. DO NOT INSTALL
OUTDOORS. Typical installations for this product include:

• Overhead (attic/mezzanine, etc.)

• Closet/mechanical room/basement/crawl space.

Other applications are acceptable, provided they comply with
this manual and local/state codes.

DANGER

CARBON MONOXIDE (CO) POISONING HAZARD

CO can cause brain damage and death. It is odorless
and colorless. The installation area must be properly
vented and joints must be tight so CO cannot enter
ductwork or enclosed space.

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.

When matched with a McQuay brand condenser or heat pump,
an ARI certified rating is available for many combinations.

Electric heat is available for all models. This is an accessory
and is not provided with the equipment. Use only the electric
heat kits identified in the “Electric Heat” section of this man­ual.

These air handlers are intended for use with a room thermostat.
The thermostat is not supplied with this equipment. Thermo­stats that use 24 VAC operating voltage must be used.

ELECTRIC HEAT

WARNING

To avoid personal injury, fire and property damage, refer
to the “Installing Electric Heat” section of this manual for
the correct installation procedure.

WARNING

The electrical characteristics of the air handler, the
electric heat kit, and the supply power must agree.

Failure to observe this warning can result in equipment
damage, fire and property damage.

This air handler does not have factory-installed electric heat.
Electric heat is available as an accessory. If installing this
option, only the HKR series heat kits can be used. See the
product catalog to determine the HKR Kit applicable to your
air handler and application.

The heating mode temperature rise is dependent upon the sys­tem airflow, the supply voltage and the heat kit size (kW)

selected. Use Tables 2-4 to determine the temperature rise (

Page 4 IM-810

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