Lennox HSXA16-024, HSXA16, 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 ConnectionsHSXA16
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. PlacementBe 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 IsolationThe 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
Refrigerant Line Sets: Installing Horizontal Runs
To hang line set from joist or rafter,
use either metal strapping material
or anchored heavy nylon wire ties.
STRAPPING MATERIAL
(Around vapor line only)
TAPE OR WIRE TIE
WIRE TIE
(Around vapor line only)
8 feet
FLOOR JOIST OR
ROOF RAFTER
TAPE OR WIRE TIE
8 feet
Strap the vapor line to the joist or rafter
at 8 ft. intervals then strap the liquid line
to the vapor line.
METAL
SLEEVE
FLOOR JOIST OR ROOF RAFTER
Figure 6
ANCHORED
HEAVY NYLON
WALL
STUD
WIRE TIE
METAL
SLEEVE
Refrigerant Line Sets: Transition From Vertical To Horizontal
AUTOMOTIVE
MUFFLER-TYPE
HANGER
WALL
STUD
Strap Liquid
Line To Vapor Line
LIQUID LINE
VAPOR LINE − WRAPPED
IN ARMAFLEX
METAL
SLEEVE
VAPOR LINE − WRAPPED
IN ARMAFLEX
Figure 7
Strap Liquid Line
To Vapor Line
LIQUID LINE
504953M 03/06
Page 6
Refrigerant Line Sets: Installing Vertical Runs (new construction shown)
NOTE − Similar installation practices should be used if line set is to be installed on exterior of outside wall.
IMPORTANT - Refrigerant
lines must not contact wall.
LIQUID LINEVAPOR LINE
WIRE TIE
INSIDE WALL
STRAP
SLEEVE
WIRE TIE
WOOD BLOCK
WIRE TIE
STRAP
IMPORTANT!
Refrigerant
lines must
not contact
structure.
OUTSIDE WALL
WOOD BLOCK
BETWEEN STUDS
VAPOR LINE WRAPPED
WITH ARMAFLEX
OUTSIDE WALL
LIQUID
LINE
CAULK
PVC PIPE
FIBERGLASS
INSULATION
WARNING
Polyol ester (POE) oils used with HFC−410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed
as much as possible. DO NOT remove line set caps
or service valve stub caps until you are ready to
make connections.
Brazing Connection Procedure
1. Cut ends of the refrigerant lines square (free from
nicks or dents). Debur the ends. The pipe must remain
round, do not pinch end of the line.
2. Before making line set connections, use dry nitrogen
to purge the refrigerant piping. This will help to prevent
oxidation and the introduction of moisture into the system.
SLEEVE
Figure 8
3. Use silver alloy brazing rods (5 or 6 percent minimum
silver alloy for copper−to−copper brazing or 45 percent
silver alloy for copper−to−brass or copper−to−steel
brazing) which are rated for use with HFC−410A refrigerant. Wrap a wet cloth around the valve body and the
copper tube stub. Remove light maroon washers from
service valves and shield light maroon stickers in order
to protect them during brazing. Braze the line set to the
service valve.
4. Wrap a wet cloth around the valve body and copper
tube stub to protect it from heat damage during brazing. Wrap another wet cloth underneath the valve body
to protect the base paint.
NOTE − The tube end must stay bottomed in the fitting
during final assembly to ensure proper seating, sealing and rigidity.
5. Install the field−provided thermostatic expansion valve
(approved for use with HFC−410A refrigerant) in the
liquid line at the indoor coil.
Page 7
HSXA16 SERIES
Refrigerant Metering Device
HSXA16 units are used in thermostatic expansion valve
(TXV) systems only. See the Lennox Engineering Handbook for approved TXV match-ups and application information.
Check expansion valves equipped with Chatleff fittings are
available from Lennox. Refer to the Engineering Handbook for applicable expansion valves for use with specific
match-ups.
If you install a thermostatic expansion valve (TXV)
with an indoor coil that includes a fixed orifice, remove the orifice before installing the TXV. See figure 9
for installation of the TXV.
Metering Device Installation
O−RING
DISTRIBUTOR
NOTE − If necessary, remove HCFC−22 flow control device (fixed
orifice/thermostatic expansion valve) from existing line set before
installing HFC−410A approved expansion valve and o−ring.
EXPANSION VALVE &
O−RING (See NOTE)
STRAINER
LIQUID LINE
STUB
Figure 9
Flushing Existing Line Set & Indoor Coil
WARNING
Danger of fire. Bleeding the refrigerant charge from only the high side
may result in the low side shell and
suction tubing being pressurized. Application of a brazing torch while
pressurized may result in ignition of
the refrigerant and oil mixture − check
the high and low pressures before unbrazing.
NOTE − If the indoor unit line and set is new, skip this section and go on to the Manifold Gauge Set section.
IMPORTANT
If this unit is being matched with an approved line
set or indoor coil which was previously charged
with mineral oil, or if it is being matched with a coil
which was manufactured before January of 1999,
the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol
ester (POE) oils are used in Lennox units charged
with HFC−410A refrigerant. Residual mineral oil
can act as an insulator, preventing proper heat
transfer. It can also clog the expansion device, and
reduce the system performance and capacity.
Failure to properly flush the system per the instructions below will void the warranty.
IMPORTANT
The Environmental Protection Agency (EPA) prohibits the intentional venting of HFC refrigerants
during maintenance, service, repair and disposal of
appliance. Approved methods of recovery, recycling or reclaiming must be followed.
CAUTION
This procedure should not be performed on systems which contain contaminants (Example: compressor burn out).
Required Equipment
You will need the following equipment in order to flush the
existing line set and indoor coil: two clean HCFC−22 recovery bottles, an oilless recovery machine with a pump down
feature, and two sets of gauges (one for use with HCFC−22
and one for use with the HFC−410A).
Flushing Procedure
1. Remove existing HCFC−22 refrigerant using the appropriate procedure below (see figure 10):
If the existing outdoor unit is not equipped with
shut−off valves, or if the unit is not operational
AND you plan to use the existing HCFC−22 refrigerant to flush the system −
Disconnect all power to the existing outdoor unit.
Connect to the existing unit, a clean recovery cyl-
inder and the recovery machine according to the
instructions provided with the recovery machine.
Remove all HCFC−22 refrigerant from the existing
system. Check gauges after shutdown to confirm
that the entire system is completely void of refrigerant.
Disconnect the liquid and vapor lines from the ex-
isting outdoor unit.
If the existing outdoor unit is equipped with
manual shut−off valves AND you plan to use NEW
HCFC−22 refrigerant to flush the system −
Start the existing HCFC−22 system in the cooling
mode and close the liquid line valve.
Pump all of the existing HCFC−22 refrigerant back
into the outdoor unit. (It may be necessary to bypass the low pressure switches to ensure complete refrigerant evacuation.)
When the low side system pressures reach 0 psig,
close the vapor line valve.
Disconnect all power to the existing outdoor unit.
Check gauges after shutdown to confirm that the
valves are not allowing refrigerant to flow back into
the low side of the system.
Disconnect the liquid and vapor lines from the ex-
isting outdoor unit.
504953M 03/06
Page 8
Flushing Connections
Inverted HCFC−22 Cylinder
(Contains clean
HCFC−22 to be used for
flushing)
Vapor Line
EXISTING
INDOOR COIL
RECOVERY CYLINDER
EXISTING VAPOR LINE
EXISTING LIQUID LINE
Service Valve
Liquid Line
Service Valve
Tank Return
Inlet
Discharge
RECOVERY MACHINE
Figure 10
2. Remove the existing outdoor unit. Set the new
HFC−410A unit and follow the brazing connection procedure which begins on the previous page to make line
set connections. DO NOT install metering device at
this time.
Make low voltage and line voltage connections to the
new outdoor unit. DO NOT turn on power to the unit
or open the outdoor unit service valves at this
time.
3. Remove the existing refrigerant flow control orifice or
thermostatic expansion valve before continuing with
flushing procedures. The existing devices are not approved for use with HFC−410A refrigerant and may
prevent proper flushing. Use a field−provided fitting to
reconnect the lines.
IMPORTANT
The line set and indoor coil must be flushed with
at least the same amount of clean refrigerant that
previously charged the system. Check the charge
in the flushing cylinder before proceeding.
4. Remove the pressure tap valve cores from the HSXA16 unit’s service valves. Connect an HCFC−22 cylinder with clean refrigerant to the vapor service valve.
Connect the HCFC−22 gauge set to the liquid line valve
and connect a recovery machine with an empty recovery tank to the gauge set.
5. Set the recovery machine for liquid recovery and start
the recovery machine. Open the gauge set valves to
allow the recovery machine to pull a vacuum on the existing system line set and indoor coil.
6. Invert the cylinder of clean HCFC−22 and open its
valve to allow liquid refrigerant to flow into the system
Low
Pressure
HSXA16
UNIT
GAUGE MANIFOLD
NOTE − The inverted HCFC−22 cylinder must contain at least the
same amount of refrigerant as was
recovered from the existing system.
High
Pressure
ClosedOpened
through the vapor line valve. Allow the refrigerant to
pass from the cylinder and through the line set and the
indoor coil before it enters the recovery machine.
7. After all of the liquid refrigerant has been recovered,
switch the recovery machine to vapor recovery so that
all of the HCFC−22 vapor is recovered. Allow the recovery machine to pull a vacuum on the system.
NOTE − A single system flush should remove all of the
mineral oil from the existing refrigerant lines and indoor coil. A second flushing may be done (using clean
refrigerant) if insufficient amounts of mineral oil were
removed during the first flush. Each time the system
is flushed, you must allow the recovery machine
to pull a vacuum on the system at the end of the
procedure.
8. Close the valve on the inverted HCFC−22 drum and
the gauge set valves. Pump the remaining refrigerant
out of the recovery machine and turn the machine off.
9. Use dry nitrogen to break the vacuum on the refrigerant lines and indoor coil before removing the recovery
machine, gauges and HCFC−22 refrigerant drum. Reinstall pressure tap valve cores into HSXA16 service
valves.
10. Install the field−provided expansion valve (approved
for use with HFC−410A refrigerant) in the liquid line at
the indoor coil.
Manifold Gauge Set
Manifold gauge sets used with systems charged with
HFC−410A refrigerant must be capable of handling the
higher system operating pressures. The gauges should be
rated for use with pressures of 0 − 800 on the high side and
a low side of 30" vacuum to 250 psi with dampened speed
to 500 psi. Gauge hoses must be rated for use at up to 800
psi of pressure with a 4000 psi burst rating.
Page 9
HSXA16 SERIES
Service Valves
The liquid line and vapor line service valves and gauge
ports are used for leak testing, evacuating, charging and
checking charge. Each valve is equipped with a service
port which has a factory−installed Schrader valve. A service port cap protects the Schrader valve from contamination and serves as the primary leak seal.
Front-Seated Service Valve (Liquid Line)
The front-seated service valve is shown in figure 11. When
this valve is closed, the service port is open to the line set.
Access the service port and open and close valves as described in the following paragraphs.
To Access Schrader Port:
1. Remove access panel.
2. Remove service port cap with an adjustable wrench.
3. Connect gauge to the service port.
4. When testing is completed, replace service port cap.
Tighten finger tight; then torque per table 1 (Page 2).
To Open Front-Seated Service Valves:
1. Remove stem cap with an adjustable wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-line
valve sizes) to back the stem out counterclockwise as
far as it will go.
3. Replace the stem cap. Tighten finger tight; then torque
per table 1 (Page 2).
To Close Front-Seated Service Valves:
1. Remove the stem cap with an adjustable wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes; 5/16" for vapor-line
valve sizes) to turn the stem clockwise to seat the
valve. Tighten it firmly.
3. Replace the stem cap. Tighten finger tight; then torque
per table 1 (Page 2).
Vapor Line Ball Valve
Ball-type service valves (see figure 12) function the same
way as the other valves but cannot be rebuilt; if one fails,
replace with a new valve. The ball valve is equipped with a
service port with a factory−installed Schrader valve. A service port cap protects the Schrader valve from contamination and assures a leak−free seal.
Front-Seated Liquid Line Service Valve
(Valve Shown Closed)
Insert hex wrench here
CAP
STEM
CAP
(Valve Shown Open)
insert hex wrench here
CAP
STEM
CAP
Service port Is open to
line set when valve is
closed (front seated)
SERVICE
PORT
To outdoor coil
SERVICE
PORT
To outdoor coil
Figure 11
Ball−Type Vapor Valve (Valve Closed)
STEM
CAP
USE ADJUSTABLE WRENCH
TO OPEN: ROTATE STEM
COUNTER-CLOCKWISE 90°.
TO CLOSE: ROTATE STEM
CLOCKWISE 90°.
TO
INDOOR
COIL
STEM
SERVICE PORT
BALL (SHOWN
CLOSED)
SCHRADER VALVE
Figure 12
To
indoor coil
To
indoor coil
TO
OUTDOOR
COIL
SERVICE
PORT CAP
504953M 03/06
Page 10
Leak Testing
After the line set has been connected to the indoor and outdoor units, the line set connections and indoor unit must be
checked for leaks.
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.
set in order to pressurize the line set and the indoor
coil.
6. After a few minutes, open a refrigerant port to check
that an adequate amount of refrigerant has been added for detection (refrigerant requirements will vary with
line lengths). Check all joints for leaks. Purge dry nitrogen and HFC−410A mixt ure. Correct any leaks and recheck.
IMPORTANT
Leak detector must be capable of sensing HFC refrigerant.
WARNING
Fire, Explosion and Personal Safety
Hazard.
Failure to follow this warning could
result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause damage by fire and/
or an explosion, that could result in
personal injury or death.
WARNING
When using a high pressure gas such
as dry nitrogen to pressurize a refrigeration or air conditioning system,
use a regulator that can control the
pressure down to 1 or 2 psig (6.9 to
13.8 kPa).
Using an Electronic Leak Detector
1. Connect the high pressure hose of the manifold gauge
set to the vapor valve service port. (Normally, the high
pressure hose is connected to the liquid line port, however, connecting it to the vapor port helps to protect the
manifold gauge set from damage caused by high pressure.)
2. With both manifold valves closed, connect the cylinder
of HFC−410A refrigerant. Open the valve on the
HFC−410A cylinder (vapor only).
3. Open the high pressure side of the manifold to allow
HFC−410A into the line set and indoor unit. Weigh in
a trace amount of HFC−410A. [A trace amount is a
maximum of 2 ounces (57 g) refrigerant or 3 pounds
(31 kPa) pressure.] Close the valve on the HFC−410A
cylinder and the valve on the high pressure side of the
manifold gauge set. Disconnect HFC−410A cylinder.
4. Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge
set.
5. Adjust dry nitrogen pressure to 150 psig (1034 kPa).
Open the valve on the high side of the manifold gauge
Evacuation
Evacuating the system of noncondensables is critical for
proper operation of the unit. Noncondensables are defined
as any gas that will not condense under temperatures and
pressures present during operation of an air conditioning
system. Noncondensables and water vapor combine with
refrigerant to produce substances that corrode copper piping and compressor parts.
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
that reads from 50 microns to at least 23,000 microns.
1. Connect manifold gauge set to the service valve ports:
low pressure gauge to vapor line service valve
high pressure gauge to liquid line service valve
2. Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of HFC−410A .
3. Connect micron gauge.
4. Connect the vacuum pump (with vacuum gauge) to
the center port of the manifold gauge set.
5. Open both manifold valves and start the vacuum
pump.
6. Evacuate the line set and indoor unit to an absolute
pressure of 23,000 microns (29.01 inches of mercury). During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once to
determine if there is a rapid rise in absolute pressure.
A rapid rise in pressure indicates a relatively large
leak. If this occurs, repeat the leak testing procedure.
NOTE − The term absolute pressure means the total
actual pressure within a given volume or system,
above the absolute zero of pressure. Absolute pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.
7. When the absolute pressure reaches 23,000 microns
(29.01 inches of mercury), close the manifold gauge
valves, turn off the vacuum pump and disconnect the
manifold gauge center port hose from vacuum pump.
Attach the manifold center port hose to a dry nitrogen
cylinder with pressure regulator set to 150 psig (1034
kPa) and purge the hose. Open the manifold gauge
valves to break the vacuum in the line set and indoor
unit. Close the manifold gauge valves.
Page 11
HSXA16 SERIES
WARNING
Danger of Equipment Damage. Avoid deep vacuum operation. Do not use compressors to evacuate a system. Extremely low vacuums can cause
internal arcing and compressor failure. Damage
caused by deep vacuum operation will void warranty.
8. Shut off the dry nitrogen cylinder and remove the manifold gauge hose from the cylinder. Open the manifold
gauge valves to release the dry nitrogen from the line
set and indoor unit.
9. Reconnect the manifold gauge to the vacuum pump,
turn the pump on, and continue to evacuate the line set
and indoor unit until the absolute pressure does not
rise above 500 microns (29.9 inches of mercury) within
a 20−minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
10. When the absolute pressure requirement above has
been met, disconnect the manifold hose from the vacuum pump and connect it to an upright cylinder of
HFC−410A refrigerant. Open the manifold gauge
valves to break the vacuum from 1 to 2 psig positive
pressure in the line set and indoor unit. Close manifold
gauge valves and shut off the HFC−410A cylinder and
remove the manifold gauge set.
Start−Up
1. Rotate fan to check for frozen bearings or binding.
2. Inspect all factory− and field−installed wiring for loose
connections.
3. After evacuation is complete, open the liquid line and
vapor line service valves to release the refrigerant
charge (contained in outdoor unit) into the system.
4. Replace the stem caps and secure finger tight, then
tighten an additional one-sixth (1/6) of a turn.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit’s
nameplate. If not, do not start the equipment until you
have consulted the power company and the voltage
condition has been corrected.
6. Set the thermostat for a high stage cooling demand
(Y1 and Y2 demand). Turn on power to the indoor
blower and close the outdoor unit disconnect switch to
start the unit.
7. Recheck voltage while the unit is running. Power must
be within range shown on the nameplate.
Refrigerant Charging
IMPORTANT
Some HFC−410A cylinders are equipped with a dip
tube which allows you to draw liquid refrigerant
from the bottom of the cylinder without turning the
cylinder upside−down. The cylinder will be marked
if it is equipped with a dip tube.
504953M 03/06
Page 12
This system is charged with HFC−410A refrigerant which
operates at much higher pressures than HCFC−22. This
unit is NOT approved for use with coils which include metering orifices or capillary tubes.
Factory Charge
Units are factory charged with the amount of HFC−410A refrigerant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with 15
feet (4.6 m) line set. For varying lengths of line set, refer to
table 3 for refrigerant charge adjustment.
Table 3
Refrigerant Charge per Line Set Lengths
Liquid Line
Set Diameter
3/8 in. (9.5mm)
*Add the amount shown if line length is greater than 15’ (4.57m), subtract the amount shown if less than 15’.
Ounces per 5 feet (grams per 1.52 meter)
adjust from 15 ft. (4.57m) line set*
3 ounces per 5 feet (85 grams per 1.52 meter)
Units Delivered Void of Charge
IMPORTANT
Mineral oils are not compatible with HFC−410A. If
oil must be added, it must be a polyol ester oil.
The compressor is charged with sufficient polyol
ester oil for approved line set lengths.
If the system is void of refrigerant, clean the system using the following procedure:
1. Use dry nitrogen to pressurize the system and check
for leaks. Repair leaks, if possible.
2. Evacuate the system to remove as much of the moisture as possible (triple evacuation).
3. Evacuate the system again. Then, weigh the appropriate amount of HFC−410A refrigerant (listed on unit
nameplate) into the system.
4. Start the unit and monitor the system to determine the
amount of moisture remaining in the oil. Use test kit
10N46 to verify that the moisture content is within the
kit’s dry color range.
5. If the moisture content is not within the dry color range,
add a new filter drier between the liquid valve and the
TXV. You may have to add a new filter drier several
times to achieve the required level of dryness.
If system dryness is not verified, the compressor
will fail in the future.
Checking Charge
The outdoor unit should be charged during warm weather.
However, applications arise in which charging must occur
in the colder months. The method of charging is deter-
mined by the outdoor ambient temperature.
Measure the liquid line temperature and the outdoor ambient temperature as outlined below:
1. Connect the manifold gauge set to the service valves:
low pressure gauge to vapor valve service port
high pressure gauge to liquid valve service port
2. Connect the center manifold hose to an upright cylinder of HFC−410A. Close manifold gauge set valves.
3. Set the room thermostat to call for heat. This will
air enter
create the necessary load for properly charging the
system in the cooling cycle.
4. Use a digital thermometer to record the outdoor ambient temperature.
5. When the heating demand has been satisfied, switch
the thermostat to cooling mode with a set point of 68F
(20C). When pressures have stabilized, use a digital
thermometer to record the liquid line temperature.
6. The outdoor temperature will determine which charging method to use. Proceed with the appropriate
charging procedure.
Charge Using the Weigh-in Method –
Outdoor Temperature <
If the system is void of refrigerant, or if the outdoor ambient
temperature is cool, the refrigerant charge should be
weighed into the unit. Do this after any leaks have been repaired.
1. Recover the refrigerant from the unit.
2. Conduct a leak check, then evacuate as previously
outlined.
3. Weigh in the unit nameplate charge.
If weighing facilities are not available or if you are charging
the unit during warm weather, follow one of the other procedures outlined below.
65F (18C)
Charge Using the Approach Method –
Outdoor Temperature >
The following procedure is intended as a general guide and
is for use on expansion valve systems only. For best results, indoor temperature should be 70°F (21°C) to 80°F
(26°C). Monitor system pressures while charging.
1. Record outdoor ambient temperature using a digital
thermometer.
2. Attach high pressure gauge set and operate unit for
several minutes to allow system pressures to stabilize.
3. Compare stabilized pressures with those provided in
table 5, Normal Operating Pressures." Minor variations in these pressures may be expected due to differences in installations. Significant differences could
mean that the system is not properly charged or that
a problem exists with some component in the system.
Pressures higher than those listed indicate that the
system is overcharged. Pressures lower than those
listed indicate that the system is undercharged. A temperature/pressure chart for HFC−410A refrigerant is
provided in table 5 for your convenience. Verify adjusted charge using the approach method.
4. Use the same digital thermometer you used to check
the outdoor ambient temperature to check the liquid
line temperature.
5. The difference between the ambient and liquid temperatures should match values given in table 4. If the
values don’t agree with the those in table 4, add refrigerant to lower the approach temperature, or recover
65F (18C)
refrigerant from the system to increase the approach
temperature. Be aware of the HFC−410A refrigerant
cylinder. It will be light maroon−colored. Refrigerant
should be added through the vapor valve in the liquid
state.
Table 4
Approach Values
Model No.
HSXA16−024 1.9 + 1 (1 + .5)
HSXA16−036 6.2 + 1 (3.5 + .5)
HSXA16−048 6.0 + 1 (3.3 + .5)
HSXA16−060 10.0 + 1 (5.6 + .5)
NOTE − For best results, the same electronic
thermometer should be used to check both outdoor
ambient and liquid line temperatures.
Approach Temperature
Liquid Line − Outdoor Ambient F (C)
IMPORTANT
Use table 5 to perform maintenance checks. Table 5
is not a procedure for charging the system. Minor
variations in these pressures may be due to differences in installations. Significant deviations could
mean that the system is not properly charged or that
a problem exists with some component in the system.
Table 5
Normal Operating Pressures In psig
(liquid +/− 10 and vapor+/− 5 PSIG)*
Temp. of
air entering outdoor coil
5F (5C)
65 (18.3) 215 144 224 135 216 138 233 143
75 (23.9) 248 146 258 139 249 140 270 145
85 (29.4) 288 148 300 143 288 143 312 147
95 (35.0) 331 150 342 147 332 145 358 147
105 (40.6) 380 152 395 148 380 147 407 149
115 (46.1) 432 155 451 149 430 150 456 150
65 (18.3) 222 142 233 131 226 132 251 127
75 (23.9) 258 144 266 134 261 135 291 135
85 (29.4) 300 146 306 137 301 137 334 141
95 (35.0) 343 148 361 141 347 140 375 142
105 (40.6) 394 150 401 142 395 142 434 146
115 (46.1) 446 153 455 144 448 145 487 149
*These are typical pressures only. Indoor indoor match up, indoor air quality, and indoor load will cause the pressures to vary.
−024 −036 −048 −060
Liq-
Suc-
Liq-
Suc-
Liq-
Suc-
uid
tion
uid
tion
uid
tion
Liquid
First Stage (Low Capacity)
Second Stage (High Capacity)
Suction
Page 13
HSXA16 SERIES
Charge Using the Subcooling Method –
Outdoor Temperature <
When the outdoor ambient temperature is below 65°F
(18°C), use the subcooling method to charge the unit. Values from (table 6) are used for this procedure.
65°F (18°C)
Table 6
HFC−410A Temperature (°F) − Pressure (Psig)
°F Psig °F Psig °F Psig °F Psig
32 100.8 63 178.5 94 290.8 125 445.9
33 102.9 64 181.6 95 295.1 126 451.8
34 105.0 65 184.3 96 299.4 127 457.6
35 107.1 66 187.7 97 303.8 128 463.5
36 109.2 67 190.9 98 308.2 129 469.5
37 111.4 68 194.1 99 312.7 130 475.6
38 113.6 69 197.3 100 317.2 131 481.6
39 115.8 70 200.6 101 321.8 132 487.8
40 118.0 71 203.9 102 326.4 133 494.0
41 120.3 72 207.2 103 331.0 134 500.2
42 122.6 73 210.6 104 335.7 135 506.5
43 125.0 74 214.0 105 340.5 136 512.9
44 127.3 75 217.4 106 345.3 137 519.3
45 129.7 76 220.9 107 350.1 138 525.8
46 132.2 77 224.4 108 355.0 139 532.4
47 134.6 78 228.0 109 360.0 140 539.0
48 137.1 79 231.6 110 365.0 141 545.6
49 139.6 80 235.3 111 370.0 142 552.3
50 142.2 81 239.0 112 375.1 143 559.1
51 144.8 82 242.7 113 380.2 144 565.9
52 147.4 83 246.5 114 385.4 145 572.8
53 150.1 84 250.3 115 390.7 146 579.8
54 152.8 85 254.1 116 396.0 147 586.8
55 155.5 86 258.0 117 401.3 148 593.8
56 158.2 87 262.0 118 406.7 149 601.0
57 161.0 88 266.0 119 412.2 150 608.1
58 163.9 89 270.0 120 417.7 151 615.4
59 166.7 90 274.1 121 423.2 152 622.7
60 169.6 91 278.2 122 428.8 153 630.1
61 172.6 92 282.3 123 434.5 154 637.5
62 175.4 93 286.5 124 440.2 155 645.0
If necessary, restrict air flow through the outdoor coil to
achieve pressures in the 325−375 psig (2240−2585 kPa)
range. Higher pressures are necessary for checking the
charge. Block equal sections of air intake panels and move
obstructions sideways until the liquid pressure is in the
325−375 psig (2240−2585 kPa) range. See figure 13.
Blocking Outdoor Coil
*Outdoor coil should be blocked one
side at a time with cardboard or plastic
sheet until proper testing pressures
are reached.
cardboard or plastic sheet
*Four−sided unit shown.
Figure 13
1. With the manifold gauge hose still on the liquid service
port and the unit operating stably, use a digital thermometer to record the liquid line temperature.
2. At the same time, record the liquid line pressure reading.
3. Use the temperature/pressure chart (table 6) to determine the saturation temperature for the liquid line
pressure reading.
4. Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine subcooling. (Saturation temperature − Liquid line tem-
perature = Subcooling)
5. Compare the subcooling value with those in table 7. If
subcooling is greater than shown, recover some refrigerant. If subcooling is less than shown, add some refrigerant. Be aware of the HFC−410A refrigerant cylinder. It will be light maroon−colored. Refrigerant should
be added through the vapor line valve in the liquid
state.
Table 7
Subcooling Values
Model Number
HSXA16−024 10 + 1 (5.6 + .5)
HSXA16−036 10 + 1 (5.6 + .5)
HSXA16−048 10 + 1 (5.6 + .5)
HSXA16−060 7 + 1 (3.9 + .5)
Second Stage (High Capacity) Satura-
tion Temp. − Liquid Line Temp. °F (°C)
System Operation
The outdoor unit and indoor blower cycle on demand from
the room thermostat. When the thermostat blower switch
is in the ON position, the indoor blower operates continuously.
Two−Stage Compressor
The two−stage scroll compressor operates much like the
standard scroll compressor. The two−stage compressor
steps between low capacity and high capacity as required
to meet cooling demand. The steps occur when gas is bypassed through a vent port in the first suction pocket. This
bypassing of gas allows the compressor to operate at low
capacity if thermostat demand allows, creating a more cost
effective and efficient compressor.
Full capacity is achieved by blocking the vent port with a
slider ring. The slider ring (vent port cover) is controlled by
a 24VDC internal solenoid in the open position allowing low
capacity. When energized the internal solenoid closes the
slider ring, blocking the vent port and bringing the compressor to full capacity. Stepping can occur during a single
thermostat demand as the motor runs continuously while
the compressor steps from low to full capacity.
Filter Drier
A filter drier is factory−installed in each HSXA16 unit to ensure a clean, moisture−free system. A replacement drier is
available from Lennox. Refer to Lennox Repair Part Program.
504953M 03/06
Page 14
High Pressure Switch
HSXA16 units are equipped with a high pressure switch
that is located in the liquid line of the compressor. The
switch (SPST, manual reset, normally closed) removes
power from the compressor when liquid pressure rises
above factory setting at 640 +
10 psi.
Low Pressure Switch
HSXA16 units are also equipped with a low pressure
switch that is located in the vapor line of the compressor.
The switch (SPST, auto−reset, normally closed) removes
power from the compressor when vapor line pressure
drops below factory setting at 40 + 5 psi.
Maintenance
WARNING
Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn
the electrical power to unit OFF at disconnect switch(es). Unit may have
multiple power supplies.
Before the start of each heating and cooling season, the
following service checks should be performed by a qualified service technician. First, turn off electrical power to
the unit prior to performing unit maintenance.
Inspect and clean the outdoor and indoor coils. The
outdoor coil may be flushed with a water hose.
NOTE − It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which
are corrosive or which block airflow across the coil
(e.g., pet urine, cottonwood seeds, etc.)
Visually inspect the refrigerant lines and coils for leaks.
Check wiring for loose connections.
Check voltage at the indoor and outdoor units (with
units operating).
Check the amperage draw at the outdoor fan motor,
compressor, and indoor blower motor. Values should
be compared with those given on unit nameplate.
Check, clean (or replace) indoor unit filters.
Check the refrigerant charge and gauge the system
pressures.
Check the condensate drain line for free and unob-
structed flow; clean, if necessary.
Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
Check drive belt for wear and proper tension.
NOTE − If owner reports insufficient cooling, the unit
should be gauged and refrigerant charge checked. Refer to section on refrigerant charging in this instruction.
NOTE − Outdoor fan motor is prelubricated and
sealed. No further lubrication is needed.
Optional Accessories
Refer to the Engineering Handbook for optional accessories that may apply to this unit. The following may or may
not apply:
Loss of charge kit
High pressure switch kit
Compressor monitor
Compressor crankcase heater
Hail guards
Mounting bases
Timed off control
Stand−off kit
Sound cover
Low ambient kit
Monitor Kit
SignatureStat room thermostat
Homeowner Information − Maintenance
In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level.
1. Ask your Lennox dealer to show you where your indoor
unit’s filter is located. It will be either at the indoor unit
(installed internal or external to the cabinet) or behind
a return air grille in the wall or ceiling. Check the filter
monthly and clean or replace it as needed.
2. Disposable filters should be replaced with a filter of the
same type and size.
NOTE − If you are unsure about the filter required for
your system, call your Lennox dealer for assistance.
IMPORTANT
Turn off electrical power to the unit at the
disconnect switch before performing any
maintenance. The unit may have multiple power
supplies.
3. Many indoor units are equipped with reusable foam filters. Clean foam filters with a mild soap and water
solution; rinse thoroughly; allow filter to dry completely
before it is returned to the unit or grille.
NOTE − The filter and all access panels must be in
place any time the unit is in operation.
4. Some systems are equipped with an electronic air
cleaner, designed to remove the majority of airborne
particles from the air passing through the cleaner. If
your system is so equipped, ask your dealer for maintenance instructions.
5. Inspect and clean indoor coil. The indoor evaporator
coil is equipped with a drain pan to collect condensate
formed as your system removes humidity from the inside air. Have your dealer show you the location of the
drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed.)
Page 15
HSXA16 SERIES
IMPORTANT
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure
of the unit to treated water (i.e., sprinkler systems,
soakers, waste water, etc) will corrode the surface of
steel and aluminum parts and diminish performance
and longevity of the unit.
6. Inspect and clean outdoor coil:
Make sure no obstructions restrict airflow to the
outdoor unit. Leaves, trash or shrubs crowding the
unit cause the outdoor unit to work harder and use
more energy. Keep shrubbery trimmed away from
the unit and periodically check for debris which
collects around the unit.
The outdoor coil may require frequent cleaning
(depending on environmental conditions). Clean
the outdoor coils with an unpressurized water
hose to remove surface contaminants and debris.
If necessary, clean the outdoor coil more frequent-
ly, especially if it is exposed to substances which
are corrosive or which block airflow across the coil
(ie, pet urine, cottonwood seeds, etc).
Thermostat Operation
Thermostat operations vary from one thermostat to another. The following provides general operation procedures.
Refer to the user’s information manual provided with your
thermostat for specific operation details.
Temperature Setting Levers
Set the lever or dial to the desired temperature setpoints
for both heating and cooling. Avoid frequent temperature
adjustment; turning the unit offthen back onbefore
pressures can equalize will put unusual stress on the unit’s
compressor.
Fan Switch
In AUTO or INT (intermittent) mode, the blower operates
only when the thermostat calls for heating or cooling. This
mode is generally preferred when humidity control is a
priority. The ON or CONT mode provides continuous indoor blower operation, regardless of whether the compressor or furnace is operating. This mode is required
when constant air circulation or filtering is desired.
System Switch
Set the system switch for heating, cooling or auto operation. The auto mode allows the system to automatically
switch from heating mode to cooling mode to maintain
predetermined comfort settings.
Temperature Indicator
The temperature indicator displays the actual room
temperature.
Programmable Thermostats
Your Lennox system may be controlled by a
programmable thermostat. These thermostats provide the
added feature of programmable time-of-day setpoints for
both heating and cooling. Refer to the user’s information
manual provided with your thermostat for detailed programming and operation details.
Preservice Check
If your system fails to operate, check the following before
calling for service:
Make sure all electrical disconnect switches are ON.
Make sure the room thermostat Temperature Selector
and System Switch (Heat, Cool, Auto) are properly
set.
Check for and replace any blown fuses, or reset any
tripped circuit breakers.
Make sure unit access panels are in place.
Make sure air filter is clean.
Write down the unit model number and have it handy
before calling.
HSXA16 Start−Up & Performance Check List
Job Name Job no. Date
Job Location City State
Installer City State
Unit Model No. Serial No. Service Technician
Nameplate Voltage Amps: 1st stage 2nd stage
Min. Circuit Ampacity Cmprsr amps: 1st stage 2nd stage
Maximum Overcurrent Protection
Electrical Connections Tight? Indoor Filter clean? Supply Voltage (Unit Off)
Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.
Liquid Pressure 1st stage 2nd stage Refrigerant Charge Checked?
Vapor Pressure 1st stage 2nd stage
Refrigerant Lines: Leak Checked? Properly Insulated? Outdoor Fan Checked?
Service Valves: Fully Opened? Caps Tight? Thermostat
Voltage With Compressor Operating Calibrated? Properly Set? Level?
504953M 03/06
Page 16
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