Lennox HSXA15 SERIES, HSXA15-030, HSXA15-024, HSXA15-042, HSXA15-036 Installation Instructions Manual

INSTALLATION

2001 Lennox Industries Inc.

Dallas, Texas

HSXA15 Outdoor Unit

HSXA15 outdoor units use R410A which is an ozone friend­ly HFC refrigerant. This unit must be installed with a match­ing indoor coil and line set as outlined in the Lennox Engi­neering Handbook. HSXA15 outdoor units are designed for
use in expansion valve systems only. They are not designed
to be used with other refrigerant flow control devices. An ex­pansion valve and filter drier approved for use with R410A
have been shipped with the unit. These components must
be installed prior to unit operation. Failure to install the

provided filter drier will void the warranty.

INSTRUCTIONS

HSXA15 SERIES UNITS

CONDENSING UNITS

504,668M
02/04

Supersedes 12/02

Table of Contents

HSXA15 Outdoor Unit 1. . . . . . . . . . . . . . . . . . . . . . . . . . .

Shipping & Packing List 1. . . . . . . . . . . . . . . . . . . . . . . . .

General Information 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setting The Unit 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Refrigerant Piping 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Flushing Existing Line Set & Indoor Coil 6. . . . . . . . . . .

Manifold Gauge Set 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Valves 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Leak Testing 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Evacuation 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Start−Up 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Charging 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories 13. . . . . . . . . . . . . . . . . . . . . . . . . .

Start−Up & Performance Check List 13. . . . . . . . . . . . . .

Retain These Instructions

For Future Reference

Litho U.S.A.

Shipping & Packing List

1 − Assembled HSXA15 outdoor unit
1 − Filter/Drier (approved for use with R410A systems)
1 − Expansion valve (approved for use with R410A)
2 − Grommets (for liquid and suction lines)
1 − Bushing (for low voltage wiring)

Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.

WARNING

Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person­al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.

IMPORTANT

This unit must be matched with an indoor coil as
specified in Lennox’ Engineering Handbook. Coils
previously charged with HCFC−22 must be flushed.

02/04

*2P0204*

General Information

These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.

WARNING

This product and/or the indoor unit it is matched with
may contain fiberglass wool.

Disturbing the insulation during installation, mainte­nance, or repair will expose you to fiberglass wool
dust. Breathing this may cause lung cancer. (Fiber­glass wool is known to the State of California to
cause cancer.)

Fiberglass wool may also cause respiratory, skin,
and eye irritation.

To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact your
supervisor.

Lennox Industries Inc.

P.O. Box 799900
Dallas, TX 75379−9900

504,668M

Page 1

*P504668M*

Unit Dimensions – Inches (mm)

HSXA15

Outdoor Unit

AIRINLET

INLET

COMPRESSOR

AIR

AIRINLET

C

4

(102)

E

2

(51)

B

JJ

H

4-7/8 (22)

G

ELECTRICAL

INLETS

VAPOR LINE

INLET

A

LIQUID

LINE INLET

H

2

(51)

4-1/2 (114)

2-3/4 (70)

D

1-3/8

(35)

2-9/16

(65)

4

(102)

TOP VIEW

DISCHARGE AIR

F

SIDE VIEWACCESS VIEW

Model No. A B C D E F G H J

HSXA15-024

HSXA15-030,
HSXA15-036,
HSXA15-042

HSXA15-048

HSXA15-060

in. 27-7/8 25-7/8 29-7/8 12-1/4 22-7/16 14-7/16 22-1/8 2-7/8 5-1/2
mm 708 657 759 311 570 367 562 73 140

in. 30-7/8 32-1/8 34-1/16 12-3/4 26-5/8 18-5/8 28-1/8 3-7/8 7-1/2

mm 784 816 865 324 676 473 718 98 191

in. 34−7/8 32-1/8 34-1/16 13-3/4 26-5/8 18-5/8 28-1/8 3-7/8 7-1/2
mm 886 816 865 349 676 473 718 98 191
in. 40-7/8 32-1/8 34-1/16 19-3/4 26-5/8 18-5/8 28-1/8 3-7/8 7-1/2
mm 1038 816 865 502 676 473 718 98 191

6-1/16

(154)

Page 2

Parts Arrangement

CONDENSER FAN

(NOT SHOWN)

TOP OF CABINET

RUN CAPACITOR

GROUND LUG

CONTACTOR

COMPRESSOR POWER

TERMINALS

HIGH PRESSURE

SWITCH

Figure 1

Setting the Unit

CAUTION

In order to avoid injury, take proper precaution when
lifting heavy objects.

CAUTION

Sharp sheet metal edges can cause injury. When
installing the unit, avoid accidental contact with
sharp edges.

Refer to unit dimensions for sizing mounting slab, plat­forms or supports. Refer to figure 2 for installation clear­ances.

VAPOR VALVE

AND GAUGE PORT

LIQUID LINE

SERVICE VALVE

AND GAUGE

COMPRESSOR

LOW PRESSURE

SWITCH

Installation Clearances

NOTE − A service access
clearance of 30" (762 mm)
must be maintained in front
of the service access panel.
Clearance to one side must
be 36" (914 mm). Clearance
to one of the remaining two
sides may be 12" (304 mm)
and the final side may be 6"
(152 mm).

NOTE − A clearance of 24" (610 mm)
must be maintained between two units.

NOTE − 48" (1219 mm) clearance required on top
of unit. Maximum soffit overhang is 36" (914 mm).

36"

(914 mm)

Figure 2

PORT

*36"

(914 mm)

*36"

(914 mm)

36"

(914 mm)

Page 3

A − Slab Mounting

When you install the unit at grade level, the top of the slab
should be high enough above the grade so that water from
higher ground will not collect around the unit. See figure 3.
Slab should have a slope tolerance away from the building
of 2 degrees or 2 inches per 5 feet (51 mm per 1.5 m). Refer
to the next section (roof mounting) for barrier construction if
the unit must face prevailing winter winds.

2 degrees or

2 in. per 5 foot

(51 mm per 1.5 m)

slope tolerance away

from building structure

ground level

Slab Mounting

discharge air

building

structure

mounting

slab

Figure 3

B − Roof Mounting

Install unit at a minimum of 4 inches above surface of the roof.
Care must be taken to ensure weight of unit is properly distrib­uted over roof joists and rafters. Either redwood or steel sup­ports are recommended.

Electrical

In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).

Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.

WARNING

Unit must be grounded in accordance with national
and local codes.
ELECTRIC SHOCK HAZARD.
Can cause injury or death.

1 − Install line voltage power supply to unit from a properly

sized disconnect switch.

2 − Ground unit at unit disconnect switch or to an earth

ground.

NOTE − To facilitate conduit, a hole is in the bottom of
the control box. Connect conduit to the control box us
ing a proper conduit fitting.

NOTE − Units are approved for use only with copper
conductors.

24V, Class II circuit connections are made in the low
voltage junction box. Refer to figure 4 for field wiring
diagram.

NOTE − A complete unit wiring diagram is located in
side the unit control box cover.

3 − Install room thermostat (ordered separately) on an in-

side wall approximately in the center of the conditioned
area and 5 feet (1.5 m) from the floor. It should not be
installed on an outside wall or where it can be effected
by sunlight, drafts or vibrations.

4 − Install low voltage wiring from outdoor to indoor unit

and from thermostat to indoor unit. See figure 5.

Page 4

(LEADLESS)

Outdoor Unit

Field Wiring Diagram

YELLOW

Thermostat Designations

Thermostat Indoor Unit

R

W1

Y

G

C

power

heat

cooling

indoor blower

common

R

W

Y

G

C

Figure 4

NOTE − see unit wiring diagram for

power supply connections.

Outdoor Unit

Y1 Outdoor Unit

C Outdoor Unit

NOTE − If the indoor unit is not equipped with blower relay. It must be field−provided and installed (P−8−3251 or equivalent).

Figure 5

Page 5

Refrigerant Piping

Model

If the HSXA15 unit is being installed with a new indoor coil
and line set, the connections should be made as outlined in
this section. If an existing line set and/or indoor coil (used
with mineral oil) is going to be used to complete the
HSXA15 system, refer to the following section which in­cludes flushing procedures.

Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections) to the indoor coil
(flare or sweat connections). Use Lennox L15 (sweat, non­flare) series line sets as shown in table 1 or use field-fabri­cated refrigerant lines. Refer to Refrigerant Piping Guide
(Corp. 9351−L9) for proper size, type, and application of
field−fabricated lines. Valve sizes are also listed in table 1.

Table 1

Refrigerant Line Sets

Model

No.

−024

−030

−036

−042

−048

−060

Valve Field Size

Connections

Liquid

Line

3/8 in.

(10 mm)

3/8 in.

(10 mm)

3/8 in.

(10 mm)

Vapor

Line

3/4 in.

(19 mm)

7/8 in.

(22 mm)

1−1/8 in.
(29 mm)

Recommended Line Set

Liquid

Line

3/8 in.

(10 mm)

3/8 in.

(10 mm)

3/8 in.

(10 mm)

Vapor

Line

3/4 in.

(19 mm)

7/8 in.

(22 mm)

1−1/8 in.
(29 mm)

(4.6 m − 15 m)

(4.6 m − 15 m)

L15

Line Sets

L15−41

15 ft. − 50 ft.

L15−65

15 ft. − 50 ft.

Field

Fabricated

NOTE − Units are designed for line sets of up to fifty feet (15 m).
For applications longer than fifty feet, consult the Lennox Refrig­erant Piping Guide (Corp. 9351−L9). Select line set diameters
from table 1 to ensure that oil returns to the compressor.

Installing Refrigerant Line

During the installation of any heat pump or a/c system, it is
important to properly isolate the refrigerant lines to prevent
unnecessary vibration. Line set contact with the structure
(wall, ceiling or floor) causes some objectionable noise
when vibration is translated into sound. As a result, more
energy or vibration can be expected. Closer attention to
line set isolation must be observed.

Following are some points to consider when placing and
installing a high−efficiency outdoor unit:

1- Placement − Be aware some localities are adopting

sound ordinances based on how noisy the unit is from
the adjacent property not at the original installation.
Install the unit as far as possible from the property line.
When possible, do not install the unit directly outside a
window. Glass has a very high level of sound transmis­sion.

2- Line Set Isolation − The following illustrations demon-

strate procedures which ensure proper refrigerant line
set isolation. Figure 6 shows how to install line sets on
vertical runs. Figure 7 shows how to install line sets on
horizontal runs. Figure 8 shows how to make a transition
from horizontal to vertical. Finally, figure 9 shows how to
place the outdoor unit and line set.

Page 6