McQuay AHP018ARAY Installation Manual

Installation and Maintenance Manual IM-801

AHP Split System Heat Pumps

1-1/2 to 5 tons

Group: Unitary

Part Number: IM-801

Date: August 2005

Supersedes: January 2005

© 2004 McQuay International

IM-801 Page 1

Table of Contents

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

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

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

SCROLL COMPRESSORS . . . . . . . . . . . . . . . . . . . . . . . . . 4

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

EVAPORATOR COIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

INDOOR CFM AND HEATING CAPACITY

DETERMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

REFRIGERANT CHARGE DETERMINATION AND

ADJUSTMENT - HEAT PUMP - COOLING CYCLE . . . . . .10

HEAT PUMP - HEATING CYCLE . . . . . . . . . . . . . . . . . . . .11

STARTUP PROCEDURE AND CHECK LIST . . . . . . . . . . .11

OPERATION - DEFROST CONTROL . . . . . . . . . . . . . . . .12

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

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

THERMOSTAT DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . .15

"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

Page 2 IM-801

design and construction at any time without notice."

© 2004 McQuay International

MODEL NOMENCLATURE

M

A

N

1
2
3
4
4
4
6
6
6

0*

A

*

odel

HP= Air Cooled Heat Pump

ominal Capacity (tons)

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

10 SEER Size 048 and 060 only.

Table 1: Unit Nameplate Model Number Identifier

Unit Nameplate McQuay Model Number

CPLE18-1C AHP018ARAY
CPLE24-1C AHP024ARAY
CPLE30-1C AHP030ARAY
CPLE36-1C AHP036ARAY
CPLE42-1C AHP042ARAY
CPLE48-1C AHP048ARAY
CPLE48-3C AHP048APAY
CPLE60-1C AHP060ARAY
CPLE60-3C AHP060APAY
CPLJ18-1B AHP018ARBY
CPLJ24-1B AHP024ARBY
CPLJ30-1B AHP030ARBY
CPLJ36-1B AHP036ARBY
CPLJ42-1B AHP042ARBY
CPLJ48-1B AHP048ARBY
CPLJ60-1B AHP060ARBY
CPLT24-1B AHP024ARCY
CPLT30-1B AHP030ARCY
CPLT36-1B AHP036ARCY
CPLT42-1B AHP042ARCY
CPLT48-1B AHP048ARCY
CPLT60-1B AHP060ARCY

AHP 018

RAY

Future Use
SEER

A = 10
B = 12
C = 13

Voltage/Phase

P = 208-230/3/6
R = 208-230/1/60

Vintage

IM-801 Page 3

INTRODUCTION

General Description

These installation instructions cover the outdoor installation of
split system heat pumps 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

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.

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

Do not allow combustible materials, gasoline or other
flammable liquids or vapors in the vicinity of this unit.
Property damage, severe personal injury or death can
result. Identify all cut-off devices, switches, etc. that
serve your comfort equipment.

WARNING

Do not connect duct work to any other heat-producing
device such as fireplace insert, stove, etc. Such
connection can cause property damage, fire, carbon
monoxide poisoning, explosion, personal injury or
death.

SCROLL COMPRESSORS

Read the following before installing units with scroll compres­sors.

Pump Down Procedure

Scroll-equipped units should never be used to evacuate the air
conditiong system. Vacuums this low can cause internal elec­trical arcing, resulting in a damaged or failed compressor.

Crankcase Heater

Scroll-equipped units do not have, and do not require, a crank­case heater.

Unbrazing System Components

If the refrigerant charge is removed from a scroll equipped unit
by bleeding the high side only, it is sometimes possible for the
scrolls to seal, preventing pressure equalization through the
compressor. This may leave the low side shell and suction line
tubing pressurized. If a brazing torch is then applied to the low
side while the low side shell and suction line contains pressure,

Page 4 IM-801

the pressurized refrigerant and oil mixture could ignite when it
escapes and contacts the brazing flame. To prevent this occur­rence, it is important to check both the high and low side with
a manifold gauge before unbrazing, or in the case of repairing
a unit on an assembly line, bleed refrigerant from both the high

and low side.

WARNING

Before unbrazing, check pressure on both high and low
side. Incorrect charge removal can leave pressurized
refrigerant and oil, which can ignite in contact with
brazing heat, causing property damage and severe
personal injury.

INSTALLATION

The manufacturer intends this unit to be used only with com­ponents indicated. An improper match voids the warranty.
See the unit catalog for Performance Values and Approved
System Matches.

Pre-Installation Checkpoints

Perform pre-installation checkpoints before attempting any
installation. Consider the following check points:

• Structural strength of supporting members

• Clearances and provision for servicing

• Power supply and wiring

• Air duct connections

• Drain facilities and connections

Clearance

The outdoor heat pump unit is designed to be located outside
the building with unobstructed condenser air inlet and dis­charge. Additionally, the unit must be situated to permit access
for service and installation. Condenser air enters from three
sides. Air discharges upward from the top of the unit. Refrig­erant tube electrical connections are made on the right side of
the unit as you face the compressor compartment. The best
and most common application is for the unit to be located 10”
from a back wall with the connection side facing the wall.
This “close to the wall” application minimizes exposed tubing
and wiring and reduces the space for children to run around the
unit, which can damage the tubes or wiring.

Figure 1. Clearances and Accessibility

10"

Service
Access
18" Min.

20"

Close to the wall application provides free, unobstructed air to
the other two sides. In more confined application spaces, such
as corners, provide a minimum 10” clearance on all air inlet
sides. Allow 18” minimum for service access to the compres­sor compartment and controls.

The top of the unit should be completely unobstructed. If units
are to be located under an overhang, there should be a mini­mum of 36” clearance and provisions made to deflect the
warm discharge air out from the overhang.

Location

Consider the effect of outdoor fan noise on the conditioned
space and any adjacent occupied space. Place the unit so the
discharge does not blow toward windows less than 25 feet
away.

Set the outdoor unit on a solid, level foundation - preferably a
concrete slab at least 4 inches thick. The slab should be above
ground level and surrounded by a graveled area for good drain­age. Any slab used as a unit foundation should not adjoin the
building, as it is possible that sound and vibration may be
transmitted to the structure. For rooftop installation, use steel
or treated wood beams as a unit support for load distribution.

Heat pumps require special location consideration in areas of
heavy snow accumulation and/or areas with prolonged contin­uous subfreezing temperatures. Heat pump unit bases are cut­out under the outdoor coil to permit drainage of frost
accumulation. The unit must be situated to permit free, unob­structed drainage of the defrost water and ice. A minimum 3"
clearance under the outdoor coil is required in the milder cli­mates.

In more severe weather locations, elevate the unit to allow
unobstructed drainage and air flow. Table 2 lists recommended
elevation minimums:

Table 2: Elevation Minimums

Design Temperature Suggested Minimum Elevation

+15

-5

o

below -5

and above

o

to + 14

o

o

2 1/2"

8"

12"

Elevation Limitations

If the outdoor unit is mounted above the air handler, the maxi­mum lift should not exceed 70 feet (suction line). If the air
handler is mounted above the outdoor unit, the lift should not
exceed 50 feet (liquid line).

Note: When installing systems where the indoor - outdoor

sections are separated by more than 15 feet, observe
the maximum elevation separations limitations.

Service
Access
18" Min.

IM-801 Page 5

10"

10"

10"