Lennox HSXA16-024, HSXA16 Series, HSXA16-036, HSXA16-048, HSXA16-060 Installation Instructions Manual

INSTALLATION

2006 Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

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.

CAUTION

Physical contact with metal edges and corners
while applying excessive force or rapid motion can
result in personal injury. Be aware of, and use
caution when working near these areas during
installation or while servicing this equipment.

INSTRUCTIONS

HSXA16 Series Units

CONDENSING UNITS

504,953M
07/06
Supersedes 03/06

Table of Contents

HSXA16 Outdoor Unit 1. . . . . . . . . . . . . . . . . . . . . . . . . .

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

General Information 2. . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

Electrical 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Refrigerant Metering Device 8. . . . . . . . . . . . . . . . . . . .

Flushing Existing Line Set & Indoor Coil 8. . . . . . . . . .

Manifold Gauge Set 9. . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Valves 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Leak Testing 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Evacuation 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Start−Up 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Refrigerant Charging 12. . . . . . . . . . . . . . . . . . . . . . . . . . .

System Operation 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories 15. . . . . . . . . . . . . . . . . . . . . . . . . .

Homeowner Information 15. . . . . . . . . . . . . . . . . . . . . . . .

Thermostat Operation 16. . . . . . . . . . . . . . . . . . . . . . . . . .

Start-up & Performance Check List 16. . . . . . . . . . . . . .

HSXA16 Outdoor Unit

Litho U.S.A.

Two−stage HSXA16 outdoor units use HFC−410A refriger-

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.

IMPORTANT

The Clean Air Act of 1990 bans the intentional vent­ing of refrigerant (CFC’s, HCFC’s AND HFC’s) as of
July 1, 1992. Approved methods of recovery, recycl­ing or reclaiming must be followed. Fines and/or in­carceration may be levied for noncompliance.

07/06 504,953M

ant. This unit must be installed with a matching indoor coil
and line set as outlined in the Lennox Engineering Hand­book. Elite® Series HSXA16 outdoor units are designed for
use in thermostatic expansion valve (TXV) systems only
and are not for use with other refrigerant flow control de­vices. The Lennox Engineering Handbook lists a TXV kit
that must be ordered separately.

Shipping & Packing List

1 − Assembled HSXA16 outdoor unit
2 − Grommets (liquid and vapor line)
1 − Bushing (for low voltage wiring)

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

Page 1

*2P0706* *P504953M*

Unit Dimensions − inches (mm)

Parts Arrangement

CONTACTOR

RUN CAPACITOR

START CAPACITOR

(MODEL −024)

DISCHARGE LINE

COMPRESSOR

TERMINAL PLUG

TWO−STAGE

COMPRESSOR

VAPOR LINE

LOW PRESSURE

SWITCH

HIGH PRESSURE

SWITCH

FILTER DRIER

32-1/8 (816)

VAPOR VALVE AND GAUGE PORT

ELECTRICAL

INLETS

SUCTION

LINE INLET

A

4-1/2
(114)

B

INLET AIR

COMPRESSOR

TOP VIEW

2-9/16
(65)

INLET
AIR

INLET AIR

DISCHARGE AIR

34-1/16 (865)

LIQUID
LINE INLET

2-1/4

(57)

3-1/8

(79)

9-1/8
(232)

27-5/8

3-1/8

(702)

(79)

9-1/8
(232)

3-1/8

(79)

2-1/4

(57)

2-3/4 (70)

Model No. Dim. A Dim. B

−024, −036 30−7/8 (785) 32−1/8 (816)

−048 34−7/8 (886) 13−3/4 (349)

−060 44−7/8 (1140) 19−3/4 (502)

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

1-3/8

(35)

4

(102)

18-5/8

(473)

26-5/8

(676)

4

(102)

6-1/16

(154)

SIDE VIEWACCESS VIEW

General Information

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

When servicing or repairing HVAC components, ensure
caps and fasteners are appropriately tightened. Table 1
lists torque values for typical service/repair items.

Table 1

Torque Requirements

Part Recommended Torque

Service valve cap 8 ft.− lb. 11 NM

Gauge port seal cap 8 ft.− lb. 11 NM

Sheet metal screws 16 in.− lb. 2 NM

Machine screws #10 28 in.− lb. 3 NM

Compressor bolts 90 in.− lb. 10 NM

504953M 03/06

Page 2

Setting the Unit

Refer to unit dimensions for sizing mounting slab, plat­forms or supports. See figure 1 for installation clearances.

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).

30"

(762 mm)

AS NOTED

AS
NOTED

AS
NOTED

Figure 1

CAUTION

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

Slab Mounting

When installing a unit at grade level, the top of the slab
should be high enough above the grade so that water from
higher ground would not collect around the unit. See figure

2. Slab may be level or have a slope tolerance away from
the building of not more than 2 degrees or 2 inches per 5
feet (51 mm per 1524 mm).

Electrical

WARNING

Electric Shock Hazard.

Can cause injury or death.

Unit must be grounded in accordance
with national and local codes.

Line voltage is present at all compo­nents when unit is not in operation on
units with single-pole contactors. Dis­connect all remote electric power sup­plies before opening access panel.
Unit may have multiple power sup­plies.

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.

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 − Connect conduit to the unit using 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 ap­propriate figure for field wiring. See figure 3 for field
wiring. See figures 4 and 3 for typical wiring.

Slab Mounting

INSTALL UNIT LEVEL OR, IF ON A SLOPE, MAINTAIN SLOPE
TOLERANCE OF 2 DEGREES (OR 2 INCHES PER 5 FEET [51 MM
PER 1.5 M]) AWAY FROM BUILDING STRUCTURE.

BUILDING
STRUCTURE

MOUNTING
SLAB

GROUND LEVEL

Figure 2

Roof Mounting

Install the unit a minimum of 6 inches (152 mm) above the
roof surface to avoid ice build−up around the unit. Locate
the unit above a load bearing wall or area of the roof that
can adequately support the unit. Consult local codes for
rooftop applications.

Page 3

Outdoor Unit Field Wiring Diagram

208/230/60/1

L2
L1

WARNING! − ELECTRIC SHOCK HAZARD. CAN CAUSE INJURY OR DEATH.
UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL
CODES.

NOTE − FOR USE WITH COPPER CONDUCTORS ONLY. REFER TO UNIT
RATING PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM
OVER-CURRENT PROTECTION SIZE.

NOTE − HARD START KIT IS REQUIRED ON −024 MODEL; OPTIONAL FOR
OTHER APPLICATIONS.

Figure 3

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

HSXA16 SERIES

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

color coded, temperature

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 affected
by sunlight, drafts or vibrations.

4. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit.

HSXA16 Wiring

NOTE − For proper voltages, select thermostat wire
gauge per the following chart:

Wire run length AWG # Insulation type

less than 100’ (30m) 18

more than 100’ (30m) 16

color−coded, temperature
rating 35ºC minimum

504953M 03/06

Figure 4

Page 4

Refrigerant Piping

024

3/8 in

7/8 in

3/8 in

7/8 in

L15 65

036

(10 mm)

(22 mm)

(10 mm)

(22 mm)

15 ft. 50 ft.

If the HSXA16 unit is being installed with a new indoor coil
and line set, the plumbing connections should be made as
outlined in this section. If an existing line set and/or indoor
coil is going to be used to complete the HSXA16 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 2 or use field-fabri­cated refrigerant lines. Valve sizes are listed in table 2.

Table 2

Refrigerant Line Sets

Field
Connections

Mod
el

−024 3/8 in. 7/8 in 3/8 in. 7/8 in L15−65

−036

−048

−060 3/8 in.

Liquid
Line

.

(10 mm)

(10 mm)

Vapor
Line

(22 mm)

1−1/8 in.
(29 mm)

Recommended Line Set

Liquid
Line

(10 mm)

3/8 in.
(10 mm)

.

Vapor
Line

(22 mm)

1−1/8 in.
(29 mm)

L15
Line Sets

15 ft. − 50 ft.
(4.6 m − 15 m)

Field
Fabricated

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.

Outside Unit Placement and Installation

Install unit away

from windows and

neighbors’ windows

NOTE − When installing refrigerant lines, refer to Lennox
Refrigerant Piping Guide (Corp. 9351−L9) or Lennox
Technical Support Product Applications for assistance. In
addition, be sure to consider the following points:

 Select line set diameters from table 2 to ensure that oil

returns to the compressor.

 Units are designed for line sets of up to fifty feet (15 m);

for longer line sets, consult piping guidelines.

 Size vertical vapor riser to maintain minimum velocity

at minimum capacity.

Refrigerant Line ConnectionsHSXA16
Matched with New Indoor Coil and Line Set

If an existing indoor coil that was equipped with an RFCI
metering device is being replaced, the liquid line must also
be replaced prior to the installation of the HSXA16 unit.

If refrigerant lines are routed through a wall, seal and iso­late the opening so vibration is not transmitted to the build­ing.

Two 90° elbows installed in line set will reduce line set vibration.

Figure 5

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 at the
neighbors’ home, 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 bed­room window. Glass has a very high level of sound
transmission. Figure 5 shows how to place the outdoor
unit and line set.

2. Line Set IsolationThe following illustrations dem-

onstrate procedures which ensure proper refrigerant
line set isolation. Figure 6 shows how to install line sets
on horizontal runs. Figure 7 shows how to make a tran­sition from horizontal to vertical. Figure 8 shows how
to install line sets on vertical runs.

Page 5

HSXA16 SERIES