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INSTALLATION
INSTRUCTIONS
E2016 Lennox Industries Inc.
Dallas, Texas, USA
Elite® Series XP16 Units
HEAT PUMP
507196-01
12/2016
WARNING
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
Improper installation, adjustment, alteration, ser­
vice or maintenance can cause property damage,
personal injury or loss of life.
Installation and service must be performed by a li­
censed professional installer (or equivalent) or ser­
vice agency.
WARNING
This product contains a chemical known to the State of
California to cause cancer, birth defects, or other repro­
ductive harm.
CAUTION
General
Before attempting to perform any service or mainte­
nance, turn the electrical power to unit OFF at dis­
connect switch.
This XP16 outdoor heat pump is designed for use with
HFC-410A refrigerant only. This unit must be installed with
an approved indoor air handler or coil. See the Lennox
XP16 Product Specifications bulletin (EHB) for approved
indoor component match-ups.
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
NOTICE !
For more in-depth information, consult the Installa­
tion and Service Procedures manual, available as
Corp. 0626-L5 on LennoxPROS.com or through the
Technical Support department at 800-453-6669.
STEP 1 -- SETTING THE UNIT -- Clearances
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
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ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
ÍÍÍÍÍÍÍÍÍÍÍÍÍ
See NOTES
See
NOTES
See
NOTES
See NOTES
Control
Box
NOTES:
Service clearance of 30 in. must be maintained on one of the sides
adjacent to the control box.
Clearance to one of the other three sides must be 36 in.
Clearance to one of the remaining two sides may be 12 in. and the
final side may be 6 in.
A clearance of 24 in. must be maintained between two units.
48 in. clearance required on top of unit.
NOTICE: Specific applications may require adjustment of the listed installation clearances to provide protection for
the unit from physical damage or to avoid conditions which limit operating efficiency. (Example: Clearances may
have to be increased to prevent snow or ice from falling on the top of the unit. Additional clearances may also be
required to prevent air recirculation when the unit is installed under a deck or in another tight space.)
FIGURE 1
Page 1
UNIT DIMENSIONS - INCHES (MM)
C
B
DISCHARGE AIR
LIQUID LINE
CONNECTION
ELECTRICAL
INLETS
A
VAPOR LINE
CONNECTION
2 (51)
4-3/4
(121)
4-1/4
(108)
SIDE VIEW
SIDE VIEW
1 (25)
UNIT SUPPORT
FEET
UNIT SUPPORT FEET
8-1/2
(216)
9-1/2
(241)
8-3/4
(222)
D
8-1/4
(210)
E
13-1/2
(343)
5-1/2
(140)
K
J
H
G
F
XP16-036 to -060 BASE WITH LEGS
XP16-024 BASE SECTION
Mode Number
A
B
C
D
E
F
G
H
J
K
XP16-024-230
35 (889)
27 (686)
28 (711)
-
-
-
-
-
-
-
XP16-036-230
35 (889)
35-1/2 (902)
39-1/2
(1003)
XP16-048-230
35 (889)
35-1/2 (902)
39-1/2
(1003)
16-7/8 (429)
8-3/4 (222)
3-1/8 (79)
30-3/4 (781)
4-5/8 (117)
3-3/4 (95)
26-7/8 (683)
XP16-060-230
45 (1143) 35-1/2 (902)
39-1/2
(1003)
WARNING
STEP 1 -- SETTING THE UNIT (Continued)
-- Unit Placement
To prevent personal injury, as well as damage to
panels, unit or structure, observe the following:
While installing or servicing this unit, carefully stow
all removed panels so that the panels will not cause
injury to personnel, objects or nearby structures.
Also, take care to store panels where they will not be
subject to damage (e.g., being bent or scratched).
While handling or stowing the panels, consider any
weather conditions (especially wind) that may
cause panels to be blown around and damaged.
NOTICE !
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil, causing the
rubber to degrade. Failure to follow this notice
could result in damage to roof surface.
Page 2
CAUTION
ELEVATED SLAB MOUNTING USING FEET
EXTENDERS
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
2” (50.8MM) SCH 40
FEMALE THREADED
ADAPTER
IMPORTANT !
Use additional 2” SCH 40 male
threaded adapters which can
be threaded into the female
threaded adapters to make
additional adjustments to the
level of the unit.
2” (50.8MM)
SCH 40 MALE
THREADED
ADAPTER
Exhaust vents from dryers, water heaters and
furnaces should be directed away from the outdoor
unit. Prolonged exposure to exhaust gases and the
chemicals contained within them may cause
condensation to form on the steel cabinet and other
metal components of the outdoor unit. This will
diminish unit performance and longevity.
PLACEMENT
BASE
Install unit away from windows.
LEG DETAIL
FIGURE 4
STABILIZING UNIT ON UNEVEN SURFACES
TWO 90° ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION.
#10 X 1/2” LONG
SELF-DRILLING
SHEET METAL
SCREWS
FIGURE 2
COIL
STABILIZING BRACKET
(18 GAUGE METAL — 2”
WIDTH; HEIGHT AS
REQUIRED)
SLAB MOUNTING
Install unit level or, if on a slope, maintain slope tolerance of 2
degrees (or 2 inches per 5 feet [50 mm per 1.5 m]) away from
building structure.
BASE PAN
#10 X 1-1/4” LONG
HEX HD SCREW AND
FLAT WASHER
PLASTIC ANCHORS
(DRILL 1/4” HOLE)
CORNER POST
CONCRETE SLAB
BUILDING
STRUCTURE
!
IMPORTANT !
Unit Stabilizer Bracket Use
(field-provided):
Always use stabilizers when unit is raised
above the factory height.
(Elevated units could become unstable in
gusty wind conditions.)
Stabilizers may be used on any unit installed
on unstable and uneven surfaces.
MOUNTING
SLAB
GROUND LEVEL
FIGURE 3
FIGURE 5
Page 3
XP16 SERIES
STEP 2 — REFRIGERANT PIPING —
Flushing Existing Line Set & Indoor Coil
WARNING
Flush the existing line set per the following instruc­
tions. For more information, refer to the Installation
and Service Procedures manual available on
LennoxPROS.com. CAUTION - DO NOT attempt to
flush and re-use existing line sets or indoor coil when
the system contains contaminants (i.e., compressor
burn out).
NOTE - When installing refrigerant lines longer than 50
feet, refer to the Refrigerant Piping Design and Fabrication
Guidelines manual available on DaveNet (Corp. 9351-L9),
or contact the Technical Support Department Product Ap­
plication group for assistance.
NOTE - For new or replacement line set installation, refer
to Service and Application Note - Corp. 9112-L4 (C-91-4).
TABLE 1
REFRIGERANT LINE SET — INCHES (MM)
Model
Field
Connections
Liquid
Line
-024
-036
-048
-060
Suction
Line
Suction
Line
3/8”
3/4”
3/8”
3/4”
(10 mm)
(19 mm)
(10 mm)
(19 mm)
L15-41
15 ft. - 50 ft.
(4.6m - 15 m)
3/8”
7/8”
3/8”
7/8”
(22 mm)
(10 mm)
(22 mm)
L15-65
15 ft. - 50 ft.
(4.6 m - 15 m)
Field-Fabricated
3/8”
1-1/8”
3/8”
1-1/8”
(10 mm)
(29 mm)
(10 mm)
(29 mm)
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.
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 fire and/or an explosion, that
could result in property damage, per­
sonal injury or death.
L15 Line Set
(10 mm)
WARNING
WARNING
Recommended Line Set
Liquid
Line
When using a high pressure gas such
as
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).
NOTE - Some applications may require a field-provided 7/8” to 1-1/8”
adapter.
WARNING
IMPORTANT !
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.
If this unit is being matched with an approved line
set or indoor unit coil that 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 installa­
tion. Take care to empty all existing traps. Polyol es­
ter (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 sys­
tem performance and capacity.
Failure to properly flush the system per this instruc­
tion and the detailed Installation and Service Proce­
dures manual will void the warranty.
IMPORTANT !
Some scroll compressors have an internal vacuum
protector that will unload scrolls when suction pres­
sure goes below 20 psig. A hissing sound will be
heard when the compressor is running unloaded.
Protector will reset when low pressure in system is
raised above 40 psig. DO NOT REPLACE COM­
PRESSOR.
Page 4
STEP 2 -- REFRIGERANT PIPING -- Removing Existing Indoor Metering Device
1A
TYPICAL EXISTING FIXED ORIFICE
REMOVAL PROCEDURE
(UNCASED COIL SHOWN)
1B
TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)
OR
TWO-PIECE PATCH PLATE
(UNCASED COIL ONLY)
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR
TUBES
STUB END
LIQUID LINE
ORIFICE
HOUSING
CHECK
EXPANSION
VALVE
TEFLON®
RING
TEFLON® RING
FIXED ORIFICE
BRASS NUT
TEFLON®
RING
DISTRIBUTOR
ASSEMBLY
REMOVE AND DISCARD
WHITE TEFLON® SEAL
(IF PRESENT)
1.
2.
3.
4.
5.
DISTRIBUTOR
ASSEMBLY
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
CYLINDER CONTAINING
CLEAN HCFC-22* TO BE
USED FOR FLUSHING
(Positioned to deliver liquid
refrigerant)
1
3.
8.
3
CLOSED
B
1.
TANK
RETURN
VAPOR
LIQUID
C
2.
INLET
DISCHARGE
RECOVERY MACHINE
3.
1.
2.
3.
4.
HCFC-22 cylinder with clean refrigerant* (positioned to deliver liquid
refrigerant) to the vapor service valve.
HCFC-22 gauge set (low side) to the liquid line valve.
HCFC-22 gauge set center port to inlet on the recovery machine with an
empty recovery tank connected to the gauge set.
Connect recovery tank to recovery machine per machine instructions.
4.
VAPOR
LINE
LIQUID
LINE
On fully cased coils, remove the coil access and plumbing panels.
Remove any shipping clamps from the liquid line and distributor
assembly.
Disconnect the equalizer line from the check expansion valve
equalizer line fitting on the vapor line.
Remove the vapor line sensing bulb.
Disconnect the liquid line from the check expansion valve at the
liquid line assembly.
Disconnect the check expansion valve from the liquid line orifice
housing. Take care not to twist or damage distributor tubes during
this process.
Remove and discard check expansion valve and the two Teflon®
rings.
Use a field-provided fitting to temporarily reconnect the liquid line to
the indoor unit's liquid line orifice housing.
HIGH
NEW
OUTDOOR
UNIT
LIQUID LINE SERVICE
VALVE
RECOVERY
CYLINDER
D
1.
2.
7.
OPENED
EXISTING
INDOOR
UNIT
SENSING BULB
6.
GAUGE
MANIFOLD
LOW
VAPOR LINE
SERVICE VALVE
MALE EQUALIZER
LINE FITTING
4.
5.
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
A
EQUALIZER
LINE
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
On fully cased coils, remove the coil access and plumbing panels.
Remove any shipping clamps from the liquid line and distributor as­
sembly.
Using two wrenches, disconnect liquid line from liquid line orifice hous­
ing. Take care not to twist or damage distributor tubes during this pro­
cess.
Remove and discard fixed orifice, valve stem assembly (if present)
and Teflon® washer as illustrated above.
Use a field-provided fitting to temporarily reconnect the liquid line to the
indoor unit's liquid line orifice housing.
2
SENSING
LINE
FLUSHING LINE SET
The line set and indoor unit 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.
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
unit coil.
B
Position the cylinder of clean HCFC-22* for delivery of liquid
refrigerant and open its valve to allow liquid refrigerant to flow into
the system through the vapor line valve. Allow the refrigerant to
pass from the cylinder and through the line set and the indoor unit
coil before it enters the recovery machine.
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 the system
down to 0.
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.
*IMPORTANT - Clean refrigerant is any refrigerant in a system that has not had compressor burn out. If the system
has experienced burn out, it is recommended that the existing line set and indoor coil be replaced.
FIGURE 6
Page 5
XP16 SERIES
STEP 2 -- REFRIGERANT PIPING -- Brazing Procedures
1
CUT AND DEBUR
Cut ends of the refrigerant lines square (free from nicks or dents)
and debur the ends. The pipe must remain round. Do not crimp end
of the line.
2
CAP AND CORE REMOVAL
Remove service cap and core from
both the suction / vapor and liquid line
service ports.
CUT AND DEBUR
SERVICE PORT
CAP
SERVICE
PORT
CORE
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
SERVICE
PORT
CORE
SERVICE VALVE
CONNECTION
SERVICE
PORT CAP
COPPER TUBE
STUB
LIQUID LINE SERVICE
VALVE
REDUCER
SUCTION / VAPOR LINE
SERVICE VALVE
LINE SET SIZE IS SMALLER
THAN CONNECTION
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
REFRIGERANT LINE
3
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE VALVES
Flow regulated nitrogen (at 1 to 2 psig) through the low-side refrigeration gauge set into the liquid line service port valve, and out of the suction /
vapor line service port valve.
1. Connect gauge set low pressure side to
liquid line service valve (service port).
USE REGULATOR TO FLOW
2.
Connect gauge set center port to bottle of
nitrogen with regulator.
3.
Remove core from valve in suction / vapor
line service port to allow nitrogen to escape.
SUCTION / VAPOR SERVICE PORT MUST BE
OPEN TO ALLOW EXIT POINT FOR NITROGEN
C
LOW
HIGH
NITROGEN AT 1 TO 2 PSIG.
ATTACH
GAUGES
B
SUCTION /
VAPOR LINE
SERVICE
VALVE
VAPOR LINE
OUTDOOR
UNIT
INDOOR
UNIT
NITROGEN
LIQUID LINE
LIQUID LINE SERVICE
VALVE
A
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
FIGURE 7
CAUTION
WARNING
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations.
Perform
operations
only
in
well-ventilated areas.
Wear gloves and protective goggles or face shield
to protect against burns.
Wash hands with soap and water after handling
brazing alloys and flux.
Danger of fire. Bleeding the
refrigerant charge from only the high
side may result in pressurization of
the low side shell and suction tubing.
Application of a brazing torch to a
pressurized system may result in
ignition of the refrigerant and oil
mixture. Check the high and low
pressures before applying heat.
Page 6
4
5
6
WRAP SERVICE VALVES
To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use
additional water-saturated cloths underneath the valve body to protect the base paint.
FLOW NITROGEN
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and
out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections.
BRAZE LINE SET
Wrap both service valves with water-saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Cloths must
remain water-saturated throughout the brazing and cool-down process.
LIQUID LINE SERVICE VALVE
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
IMPORTANT — Allow
braze joint to cool. Apply
additional water-saturated cloths to help cool brazed
joint. Do not remove water-saturated cloths until
piping has cooled. Temperatures above 250ºF will
damage valve seals.
WATER-SATURATED
CLOTH
LIQUID LINE
WARNING
SUCTION / VAPOR LINE
SERVICE VALVE
FIRE, PERSONAL INJURY, OR PROPERTY DAMAGE
may result if you do not wrap a water-saturated cloth around
both liquid and suction line service valve bodies and copper
tube stub while brazing the line set! The braze, when
complete, must be quenched with water to absorb any
residual heat.
Do not open service valves until refrigerant lines and
indoor coil have been leak-tested and evacuated. Refer
to Installation and Service Procedures manual found on
DAVENET.
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
SUCTION / VAPOR LINE
WATER-SATURATED
CLOTH
7
PREPARATION FOR NEXT STEP
After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water-saturated cloths to both
services valves to cool piping. Once piping is cool, remove all water-saturated cloths.
FIGURE 7 (CONTINUED)
Page 7
XP16 SERIES
STEP 3 -- INSTALLING INDOOR EXPANSION VALVE
This outdoor unit is designed for use in systems that include an check/expansion valve metering device. See the XP16
Product Specifications bulletin (EHB) for approved check/expansion valve kit match-ups and application information. The
check/expansion valve can be installed internal or external to the indoor coil. In applications where an uncased coil is being
installed in a field-provided plenum, install the check/expansion valve in a manner that will provide access for future field
service of the check/expansion valve. Refer to below illustration for reference during installation of check/expansion valve.
INDOOR EXPANSION VALVE INSTALLATION
TWO PIECE
PATCH PLATE
(UNCASED
COIL ONLY)
DISTRIBUTOR
TUBES
3.
(Uncased Coil Shown)
LIQUID LINE
ORIFICE
HOUSING
STUB
END
CHECK
EXPANSION
VALVE
4.
TEFLON®
RING
5.
TEFLON®
RING
SENSING
LINE
6.
DISTRIBUTOR
ASSEMBLY
EQUALIZER
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
Install one of the provided
rings around the
stubbed end of the check expansion valve and lightly
lubricate the connector threads and expose surface of
the Teflon® ring with refrigerant oil.
Attach the stubbed end of the check expansion valve to
the liquid line orifice housing. Finger tighten and use an
appropriately sized wrench to turn an additional 1/2 turn
clockwise as illustrated in the figure above, or tighten to
20 ft-lb.
Place the remaining Teflon® washer around the other
end of the check expansion valve. Lightly lubricate
connector threads and expose surface of the Teflon®
ring with refrigerant oil.
Attach the liquid line assembly to the check expansion
valve. Finger tighten and use an appropriately sized
wrench to turn an additional 1/2 turn clockwise as
illustrated in the figure above or tighten to 20 ft-lb.
VAPOR
LINE
LIQUID LINE
2.
Sensing bulb insulation is required if mounted
external to the coil casing. See Sensing Bulb
Installation for bulb positioning.
Attach the vapor line sensing bulb in the proper
orientation as illustrated below using the clamp and
1/8 Turn
screws provided.
NOTE - Confirm proper thermal contact between vapor
line and sensing bulb before insulating the sensing bulb
11 12 1
2
10
once installed.
9
3
Connect the equalizer line from the check/expansion 8
4
valve to the equalizer vapor port on the vapor line. Finger
7 6 5
tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated
below left.
EQUALIZER LINE INSTALLATION
1.
2.
9 O'CLOCK TO
3 O'CLOCK
Remove and discard either the flare seal cap or flare nut
with copper flare seal bonnet from the equalizer line port on
the vapor line as illustrated in the figure below.
Remove the field-provided fitting that temporarily recon­
nected the liquid line to the indoor unit's distributor assembly.
FLARE SEAL CAP
BULB
FLARE NUT
12
BULB
ON LINES SMALLER THAN
7/8”, MOUNT SENSING
BULB BETWEEN THE 9 AND
3 O'CLOCK POSITIONS.
VAPOR LINE
VAPOR LINE
OR
11 12 1
2
10
9
3
4
8
7 6 5
SENSING BULB INSTALLATION
1.
MALE EQUALIZER LINE
FITTING
(SEE EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
1/2 Turn
Teflon®
ON 7/8” AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT
THE SENSING BULB ON
BOTTOM OF LINE.
COPPER FLARE
SEAL BONNET
12
MALE BRASS EQUALIZER
LINE FITTING
BULB
BULB
NOTE - NEVER MOUNT THE SENSING BULB ON
BOTTOM OF LINE.
VAPOR LINE
FIGURE 8
Page 8
STEP 4 -- LEAK TEST AND EVACUATION
LOW
HIGH
MANIFOLD GAUGE SET
OUTDOOR UNIT
A
B
TO VAPOR
SERVICE VALVE
NOTE - Position
canister to deliver
liquid refrigerant.
NITROGEN
1
HFC-410A
CONNECT GAUGE SET
A. Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port.
NOTE - Normally, the high pressure hose is connected to the liquid line port. However, connecting it
to the vapor port better protects the manifold gauge set from high pressure damage.
B. With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of
the manifold gauge set.
NOTE - Later in the procedure, the HFC-410A container will be replaced by the nitrogen container.
2
TEST FOR LEAKS
After the line set has been connected to the indoor and outdoor units, check the line set connections
and indoor unit for leaks. Use the following procedure to test for leaks:
A. With both manifold valves closed, connect the cylinder of HFC-410A refrigerant to the center port of
the manifold gauge set. Open the valve on the HFC-410A cylinder (vapor only).
B. 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 two ounces (57 g) refriger­
ant or three 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 the HFC-410A cylinder.
C. Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold
gauge set.
D. Adjust nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge
set in order to pressurize the line set and the indoor unit.
E. After a few minutes, open one of the service valve ports and verify that the refrigerant added to the
system earlier is measurable with a leak detector.
F. After leak testing, disconnect gauges from service ports.
FIGURE 9
Page 9
XP16 SERIES
STEP 4 -- LEAK TEST AND EVACUATION (Continued)
3
EVACUATION
CONNECT GAUGE SET
LOW
HIGH
NOTE - Remove cores from service valves (if not already done).
A.
B.
C.
D.
Connect low side of manifold gauge set
with 1/4 SAE in-line tee to vapor line
service valve
Connect high side of manifold gauge
set to liquid line service valve
Connect available micron gauge
connector on the 1/4 SAE in-line tee.
Connect the vacuum pump (with
vacuum gauge) to the center port of the
manifold gauge set. The center port line
will be used later for both the HFC-410A
and nitrogen containers.
NITROGEN
OUTDOOR
UNIT
A
MANIFOLD
GAUGE SET
1/4 SAE TEE WITH SWIVEL
COUPLER
500
MICRON
GAUGE
C
TO VAPOR
SERVICE VALVE
NOTE - Position
canister to deliver
liquid refrigerant.
HFC-410A
VACUUM PUMP
B
TO LIQUID LINE
SERVICE VALVE
D
4
RECOMMEND
MINIMUM 3/8” HOSE
EVACUATE THE SYSTEM
A.
B.
Open both manifold valves and start the vacuum pump.
Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).
NOTE - During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. 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 above absolute zero within a given volume or system. Absolute
pressure in a vacuum is equal to atmospheric pressure minus vacuum pressure.
C. When the absolute pressure reaches 23,000 microns (29.01 inches of
mercury), perform the following:
1. Close manifold gauge valves.
2. Close valve on vacuum pump.
Possible equipment damage.
3. Turn off vacuum pump.
Avoid deep vacuum operation. Do not use
4. Disconnect manifold gauge center port hose from vacuum pump.
compressors to evacuate a system.
5. Attach manifold center port hose to a nitrogen cylinder with
Extremely low vacuum can cause internal
pressure regulator set to 150 psig (1034 kPa) and purge the hose.
arcing and compressor failure. Damage
6. Open manifold gauge valves to break the vacuum in
the line set and indoor unit.
caused by deep vacuum operation will
7. Close manifold gauge valves.
void warranty.
D. Shut off the nitrogen cylinder and remove the manifold gauge hose from
the cylinder. Open the manifold gauge valves to release the nitrogen from the line set and indoor unit.
E. 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.
F. When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to a
cylinder of HFC-410A positioned to deliver liquid refrigerant. Open the manifold gauge valve 1 to 2 psig in order to release the vacuum in the
line set and indoor unit.
G. Perform the following:
1. Close manifold gauge valves.
1/6 TURN
2. Shut off HFC-410A cylinder.
3. Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores
12 1
with core tool while maintaining a positive system pressure.
11
2
10
4. Replace stem caps and finger tighten them, then tighten an additional one-sixth (1/6) of a
turn as illustrated.
9
3
4
8
5
7
6
WARNING !
FIGURE 10
Page 10
STEP 5 -- ELECTRICAL -- Circuit Sizing and Wire Routing
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 Elec­
trical Code (CEC).
Refer to the furnace or air handler installation instructions for addi­
tional wiring application diagrams and refer to unit nameplate for
minimum circuit ampacity and maximum overcurrent protection
size.
IMPORTANT !
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start-up to pre­
vent compressor damage as a result of slugging.
CAUTION
24VAC TRANSFORMER
Use the transformer provided with the furnace or air handler for
low‐voltage control power (24VAC - 40 VA minimum).
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.
1
SIZE CIRCUIT AND INSTALL DISCONNECT SWITCH
Refer to the unit nameplate for minimum circuit ampacity, and
maximum fuse or circuit breaker (HACR per NEC). Install power
wiring and properly sized disconnect switch.
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
2
MAIN FUSE BOX/
BREAKER PANEL
Electrostatic discharge can affect
electronic components. Take care
during unit installation and service
to protect the unit's electronic controls. Precautions will help to avoid
control exposure to electrostatic
discharge by putting the unit, the
control and the technician at the
same electrostatic potential. Touch
hand and all tools on an unpainted
unit surface before performing any
service procedure to neutralize
electrostatic charge.
INSTALL THERMOSTAT
Install room thermostat (ordered separately) on an inside wall
approximately in the center of the conditioned area and 5 feet
(1.5m) from the floor. It should not be installed on an outside wall
or where it can be affected by sunlight or drafts.
THERMOSTAT
DISCONNECT
SWITCH
5 FEET
(1.5M)
NOTE - Units are approved for use only with copper conductors.
Ground unit at disconnect switch or connect to an earth ground.
NOTE - 24VAC, Class II circuit connections are made in the control
panel.
FIGURE 11
Page 11
XP16 SERIES
3
HIGH VOLTAGE FIELD WIRING
LOW VOLTAGE CONNECTIONS
LOW VOLTAGE (24V) FIELD WIRING
C
24VAC
CONNECTIONS
WIRE RUN LENGTH
AWG# INSULATION TYPE
LESS THAN 100' (30 METERS)
18
TEMPERATURE RATING
MORE THAN 100' (30 METERS)
16
35ºC MINIMUM.
NOTE - For proper voltages, select thermostat wire (control wires)
gauge per table above.
NOTE - Do not bundle any excess 24VAC control wires inside
control box.
A. Run 24VAC control wires through cutout with grommet.
B. Run 24VAC control wires through wire tie.
C. Make 24VAC control wire connections.
D. Tighten wire tie to security 24V control wiring.
A
NOTE - Wire tie provides low voltage wire strain relief and maintains
separation of field-installed low and high voltage circuits.
CUTOUT WITH GROMMET
B
D
24V CONTROL WIRES
TIGHTEN WIRE TIE
Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit as illustrated. See figures 14 and 15 for typical field
connections when connecting unit to either a CBX32MV or CBX40UHV in non-communicating mode. For connections to other Lennox air handlers
or furnaces, see the ComfortSense® 7000 installation instruction for further wiring diagrams.
FIGURE 12
4
HIGH VOLTAGE POWER SUPPLY CONNECTIONS
GROUND
NOTE - Any excess high voltage field wiring
should be trimmed and secured away from
any low voltage field wiring.
OUTDOOR UNIT
CONTROL BOX
G
L1
L2
NOTE - To facilitate a conduit, a cutout is lo­
cated in the bottom of the control box. Connect
conduit to the control box using a proper con­
duit fitting.
CONDUIT
CUTOUT
CONDUIT
FIGURE 13
Page 12
Typical Field Wiring — Heat Pump Application with
CBX32MV or CBX40UHV
CBX32MV
OR
CBX40UHV
HEAT PUMP UNIT
(TWO-STAGE)
R
COMFORTSENSET
7000
R
R
W3
H
W2
W2
W1
W1
W1
O
O
O
1
X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOOR
TEMPERATURE DISPLAY, DEW POINT CONTROL, HEAT PUMP AND
DUAL FUEL BALANCE POINTS.
2
CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT # 47W97)
IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000
WITH THE LSOM 2.
1
O. D.
SENSOR
(X2658)
3
FIELD-PROVIDED JUMPER BETWEEN Y2 OUT BL ON HEAT
PUMP TO Y2.
AIR
HANDLER
CONTROL
2
Y1
Y1
Y1
Y2
Y2
G
G
3
DS
D
Y2
B
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE HP
T
CUT ON-BOARD LINK R -O.
T
C
C
C
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
Y1-Y2
2-STAGE
COMPR
R-O
HEAT
PUMP
R-DS
DEHUM
OR
HARMONY
CUT FOR OPTION
Y2
OUT
BL
IMPORTANT - USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE INSTALLATION
INSTRUCTION FOR FURTHER DETAILS.
L
L
FIGURE 14
CBX32MV OR
CBX40UHV
OUTDOOR UNIT
COMFORTSENSEt
7000 THERMOSTAT
RED
RED
FAN RELAY (NOT REQUIRED
WITH SINGLE−SPEED
OUTDOOR FAN)
OUTDOOR
SENSOR
BLACK
T
PURPLE
PURPLE
T
(X2658)
BLACK
YELLOW
BLUE
BROWN (NOT USED FOR APPLICATIONS WITHOUT LSOM
BLUE (NOT REQUIRED FOR SINGLE STAGE)
AIR
HANDLER
CONTROL
RESISTOR KIT (CAT # 47W97) IS REQUIRED
WHEN CONNECTING THE COMFORTSENSE
7000 WITH THE LSOM 2.
IMPORTANT - USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE INSTALLATION
INSTRUCTION FOR FURTHER DETAILS.
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE A/C ONLY
CUT ON-BOARD LINK R -O.
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION
TERMINAL IS USED.
Y1-Y2
2-STAGE
COMPR
R-O
HEAT
PUMP
R-DS
DEHUM
OR
HARMONY
CUT FOR OPTION
Heat Pump Application — Humiditrol® and
Second-Stage Outdoor Fan Relay Wiring with
CBX32MV or CBX40UHV
FIGURE 15
Page 13
XP16 SERIES
Charging
The XP16 unit is factory-charged with enough HFC-410A refrigerant to accommodate a 15-foot length of refrigerant piping.
Charge should be checked and adjusted using the tables provided on the charging procedure sticker on the unit access
panel. Detailed information is given in the XP16 Installation and Service Procedures manual, which is available on
LennoxPROS.com.
Adding refrigerant for long line sets
Use the charging formula listed in figure 16 to calculate liquid line charge required for long line sets.
WEIGH-IN
NOTE - Insulate liquid line when it is routed through areas where the
surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or
greater than 20 psig.
CHARGING METHOD FOR LONG LINE SETS
64ºF (17.7ºC) and Below
Adjust amount for variation in
Amount specified line set length and liquid line
diameter using table below.
on nameplate
+
NOTE - The nameplate shown is for illustration purposes only. Go to
actual nameplate on outdoor unit for charge information.
Total charge
=
Charging Formula for Liquid Line Charge Adjustments
Liquid Line
Set Diameter
HFC-410A
(ounces per foot)
5/16”
0.40
3/8”
0.60
1/2”
1.00
[(Line set oz./ft. x total length) ­ (factory charge for line set)] = charge adjustment
Example: Units are factory­charged for 15 feet (4.6 meters) of 3/8" line set.
Factory charge for 3/8" is 0.60 oz/ft x 15 = 9.0 ounces.
FIGURE 16
System Configuration
This section addresses:
D Unit components (sensors, temperature switch, pres­
sure switches and demand defrost control)
D Second-stage operation
UNIT COMPONENTS
Demand Defrost Control (A108)
The demand defrost control measures differential temper­
atures to detect when the system is performing poorly be­
cause of ice build-up on the outdoor coil. The control selfcalibrates when the defrost system starts and after each
system defrost cycle. The demand defrost control compo­
nents are shown in figure 17.
D Demand defrost control connections, jumpers and LED
locations are shown in figure 17.
D Demand defrost control connections, jumpers and LED
descriptions are listed on table 2.
D Demand defrost control status, fault and lockout LEDs
are listed in table 3.
Page 14
TEST PINS (P1)
LOW AMBIENT
THERMOSTAT PINS
(P3)
DEFROST TERMINATION
PIN SETTINGS (P1)
SENSOR CONNECTION
(COIL AND AMBIENT
SENSORS)
(P4)
DIAGNOSTIC LEDS
(DS1 AND DS2)
DELAY PINS
(P5)
24V TERMINAL STRIP
CONNECTIONS
(P2)
REVERSING VALVE
(O OUT)
Demand Defrost
Control (A108)
PRESSURE
SWITCH CIRCUIT
CONNECTIONS
Note - Component locations vary by board manufacturer.
FIGURE 17
Page 15
XP16 SERIES
TABLE 2
DEMAND DEFROST CONTROL (A108) INPUTS, OUTPUTS AND CONFIGURABLE SETTINGS
Control
Locations
P1
P2
P3
P4
P5
Control Label or
Description
Purpose
Function
50, 70, 90, 100
Defrost Temperature
Termination Shunt (Jumper)
Pins
The demand defrost control (illustrated in figure 17) has selections which
are: 50, 70, 90, and 100°F (10, 21, 32 and 38°C). The shunt termination
pin is factory-set at 50°F (10°C). If the temperature shunt is not installed,
the default termination temperature is 90°F (32°C).
W1
24VAC Thermostat Input /
Output
24VAC input / output from indoor thermostat to indoor unit.
C
24VAC Common
24VAC common.
L
Thermostat Service Light
Thermostat service light connection.
R
24VAC
24VAC.
Y2
Thermostat Input
Controls the second stage operation of the unit.
O
Thermostat Input
Reversing valve solenoid.
Y1
Thermostat Input
Controls the operation of the unit.
55, 50, 45, 40
Low Ambient Thermostat Provides selection of the Y2 compressor lock-in temperature. Valid
Pins
options are 40, 45, 50 and 55 degrees Fahrenheit.
DIS-YEL
Coil Sensor
(P4-5) Ground connection for outdoor coil temperature sensor.
(P4-6) Connection for outdoor coil temperature sensor.
AMB-BLACK
Ambient Sensor
(P4-3) Ground connection for outdoor ambient temperature sensor.
(P4-4) Connection for outdoor ambient temperature sensor.
COIL-BROWN
Discharge Sensor
No discharge sensor is used; replaced by 10K resistor.
DELAY
The demand defrost control has a field-selectable function to reduce
occasional sounds that may occur while the unit is cycling in and out of
the defrost mode. When a jumper is installed on the DELAY pins, the
compressor will be cycled off for 30 seconds going in and out of the
defrost mode. Units are shipped with jumper installed on DELAY pins.
Delay Mode
NOTE - The 30-second off cycle is NOT functional when TEST pins on
P1 are jumpered.
P6
TST, PS DF, C, R, O, Y1, Y2
Factory Test Connectors
No field use.
DS1
RED LED
DS2
GREEN LED
Diagnostic LED
Demand defrost control LEDs may be OFF, ON, or FLASHING to
indicate diagnostic conditions which are described in table 3.
FAN
TWO CONNECTORS
Condenser Fan Operation
These two connections provide power for the condenser fan.
O OUT
O OUT
24 VAC output
24 VAC output connection for reversing valve.
When the low pressure switch trips, the demand defrost control will cycle
off the compressor, and the strike counter in the demand defrost control
will count one strike. The low pressure switch is ignored under the
following conditions:
LO-PS
LO-PS
Low-Pressure Switch
D
during the defrost cycle and 90 seconds after the termination of
defrost
D
D
D
when the average ambient sensor temperature is below 0°F (-18°C)
during 90 seconds following the start of the compressor
during TEST mode.
Y2 OUT
Y2 OUT
24 VAC Output
24 VAC output for second-stage compressor solenoid.
Y1 OUT
Y1 OUT
24 VAC Common Output
24 VAC common output, switched for enabling compressor contactor.
HS-PS
HS-PS
High-Pressure Switch
When the high pressure switch trips, the demand defrost control will cycle
off the compressor, and the strike counter in the demand defrost control
will count one strike.
L
L
Service Light Output
24VAC service light output.
24V
24V
24 Volt output
24VAC typically used to supply power to the Lennox System Operation
Monitor (LSOM). Not used in this system.
Page 16
NOTE - The demand defrost control accurately measures
the performance of the system as frost accumulates on the
outdoor coil. This typically will translate into longer running
time between defrost cycles as more frost accumulates on
the outdoor coil before the demand defrost control initiates
defrost cycles.
Defrost System
This section addresses:
D Emergency Heat
D Defrost System Overview
D Defrost Control Connections, Jumper Settings and Fea­
tures
DEFROST CONTROL CONNECTIONS, JUMPERS
SETTINGS AND FEATURES
D Operational Mode Overview (Calibration, Normal and
Defrost)
Defrost Temperature Termination Jumper
Settings (P1)
The demand defrost control selections are: 50, 70, 90 and
100°F (10, 21, 32 and 38°C). The shunt termination pin is
factory set at 50°F (10°C). If temperature shunt is not
installed, default termination temperature is 90°F (32°C).
D Defrost Cycle Actuation
EMERGENCY HEAT (AMBER LIGHT)
An emergency heat function is designed into some room
thermostats. This feature is applicable when isolation of the
outdoor unit is required, or when auxiliary electric heat is
staged by outdoor thermostats. When the room thermostat is
placed in the emergency heat position, the outdoor unit con­
trol circuit is isolated from power and field‐provided relays by­
pass the outdoor thermostats. An amber indicating light si­
multaneously comes on to remind the homeowner that he is
operating in the emergency heat mode.
Emergency heat is usually used during an outdoor unit
shutdown, but it should also be used following a power out­
age if power has been off for over an hour and the outdoor
temperature is below 50°F (10°C). System should be left in
the emergency heat mode at least six hours to allow the
crankcase heater sufficient time to prevent compressor
slugging.
DEFROST SYSTEM OVERVIEW
The control monitors ambient temperature, outdoor coil
temperature, and total run time to determine when a de­
frost cycle is required. The coil temperature probe is de­
signed with a spring clip to allow mounting to the outside
coil tubing. The location of the coil sensor is important for
proper defrost operation.
Test Pins (P1) Function
Placing the jumper on the field test pins (P1) allows the
technician to:
D Clear short cycle lockout
D Clear five-strike fault lockout
D Cycle the unit in and out of defrost mode
D Place the unit in defrost mode to clear the coil
Compressor Delay Mode (P5)
The demand defrost control has a field-selectable function
to reduce occasional sounds that may occur while the unit
is cycling in and out of the defrost mode. When a jumper is
installed on the DELAY pins, the compressor will be cycled
off for 30 seconds going in and out of the defrost mode.
Units are shipped with jumper installed on DELAY pins.
NOTE - The 30 second off cycle is NOT functional when
jumpering the TEST pins.
HIGH PRESSURE SWITCH (S4)
This unit is equipped with a high pressure switch which is
located on the liquid line. The SPST, normally closed pres­
sure switch opens when liquid line pressure rises above
the factory setting of 590 + 15 psig and automatically re­
sets at 418 + 15 psig.
Page 17
XP16 SERIES
DEMAND DEFROST CONTROL (A108) DIAGNOSTIC LEDS
The state (Off, On, Flashing) of two LEDs on the demand defrost control (DS1 [Red] and DS2 [Green]) indicate diagnostics conditions that
are described in table 3.
TABLE 3
DEMAND DEFROST CONTROL (A108) DIAGNOSTIC LEDS
DS1 and DS2 System Status, Fault and Lockout Codes
DS2
Green
OFF
DS1
Red
OFF
Simultaneous SLOW
Flash
Alternating SLOW
Flash
Simultaneous FAST
Flash
Alternating
FAST Flash
Type
Condition/Code
No power (24V) to demand defrost
control terminals R and C or demand
defrost control failure.
Status
Power problem
Status
Normal operation
Status
5-minute anti-short cycle delay
Fault
Ambient Sensor Problem
Fault
Coil Sensor Problem
ON
ON
Fault
Demand Defrost Control Failure
OFF
SLOW
Flash
Fault
Low Pressure Fault
OFF
ON
Lockout
Low Pressure Lockout
SLOW
Flash
OFF
Fault
Possible Cause(s)
OFF
Lockout
High Pressure Lockout
SLOW
Flash
ON
Fault
Discharge Line Temperature Fault
FAST Fla­
sh
ON
Lockout
Discharge Line Temperature
Lockout
OFF
Fast
Flash
Fault
Discharge Sensor Fault
Fast
Flash
OFF
Lockout
Discharge Sensor Lockout
1.Check control transformer power (24V).
2.If power is available to demand defrost control and
LED(s) do not light, replace demand defrost con­
trol.
Unit operating normally or in standby
None required.
mode.
Initial power up, safety trip, end of
None required (jumper TEST pins to override)
room thermostat demand.
Sensor being detected open or shorted or out of temperature range. Demand defrost control
will revert to time/temperature defrost operation. (System will still heat or cool).
Sensor being detected open or shorted or out of temperature range. Demand defrost control
will not perform demand or time/temperature defrost operation. (System will still heat or cool.)
Indicates that demand defrost control has internal component failure. Cycle 24VAC power to
demand defrost control. If code does not clear, replace demand defrost control.
S
Remove any blockages or restrictions from coils
and/or fans. Check indoor and outdoor fan
motor for proper current draws.
Improper refrigerant charge in
system.
S
Check system
method.
S
Improper metering device
installed or incorrect operation
of metering device.
S
Check system operating pressures and
compare to unit subcooling tables in this
instruction or located on unit access panel.
S
Incorrect or improper sensor
location or connection to
system.
S
Make sure all pressure switches and sensors
have secure connections to system to prevent
refrigerant leaks or errors in pressure and
temperature measurements.
S
Restricted air flow over indoor or
outdoor coil.
S
High Pressure Fault
ON
Solution
charge
using
subcooling
This code detects shorted sensor or high discharge temperatures. If the discharge line
temperature exceeds a temperature of 285ºF (140ºC) during compressor operation, the
demand defrost control will de-energize the compressor contactor output (and the defrost
output if active). The compressor will remain off until the discharge temperature has dropped
below 225ºF (107ºC).
The demand defrost control detects open sensor or out of temperature sensor range. This fault
is detected by allowing the unit to run for 90 seconds before checking sensor resistance. If the
sensor resistance is not within range after 90 seconds, the demand defrost control will count
one fault. After 5 faults, the demand defrost control will lock out.
(Each fault adds 1 strike to that code's counter; 5 strikes per code = LOCKOUT)
Field Operation Checklist for Two-Stage Modulation Compressors
Unit Readings
Y1 - First‐Stage
Expected results during Y2 demand
(Toggle switch On)
Compressor
Voltage
Same
Amperage
Higher
Outdoor Unit Fan Motor
Amperage
Same or Higher
Temperature
Ambient
Same
Outdoor Coil Discharge Air
Higher
Compressor Discharge Line
Higher
Indoor Return Air
Same
Indoor Coil Discharge Air
Lower
Pressures
Suction (Vapor)
Lower
Liquid
Higher
Page 18
Y2 - Second‐Stage
Start-Up and Performance Checklist
Customer
Address
Indoor Unit Model
Serial
Outdoor Unit Model
Serial
Notes:
START UP CHECKS
Refrigerant Type:
Rated Load Amps:
Actual Amps
Condenser Fan Full Load Amps
Actual Amps:
Rated Volts
Actual Volts
COOLING MODE
Suction Pressure:
Liquid Pressure:
Supply Air Temperature:
Ambient Temperature:
Return Air: Temperature:
System Refrigerant Charge (Refer to manufacturer's information on unit or installation instructions for required
subcooling and approach temperatures.)
Subcooling:
A
—
B
=
SUBCOOLING
A
—
B
=
APPROACH
A
—
B
= COIL TEMP DROP
Saturated Condensing Temperature (A)
minus Liquid Line Temperature (B)
Approach:
Liquid Line Temperature (A)
minus Outdoor Air Temperature (B)
Indoor Coil Temperature Drop (18 to 22°F)
Return Air Temperature (A)
minus Supply Air Temperature (B)
Page 19
XP16 SERIES
3. 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. (Also check the auxiliary drain for ob­
structions if one is installed.)
Homeowners Information
CAUTION
Before attempting to perform any service or mainte­
nance, turn the electrical power to unit OFF at dis­
connect switch.
Cleaning of the outdoor unit's coil should be performed by
a licensed professional service technician (or equivalent).
Contact your dealer and set up a schedule (preferably
twice a year, but at least once a year) to inspect and ser­
vice your outdoor unit. The following maintenance may be
performed by the homeowner.
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, diminish performance
and affect longevity of the unit.
Outdoor Coil
The outdoor unit must be properly maintained to ensure its
proper operation.
D Please contact your dealer to schedule proper inspec­
tion and maintenance for your equipment.
D Make sure no obstructions restrict airflow to the outdoor
unit.
D Grass clippings, leaves, or shrubs crowding the unit can
cause the unit to work harder and use more energy.
D Keep shrubbery trimmed away from the unit and periodi­
cally check for debris which collects around the unit.
D Keep snow level below the louvered panels to ensure
proper performance.
Routine 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.
NOTE - The filter and all access panels must be in place
any time the unit is in operation. If you are unsure about the
filter required for your system, call your Lennox dealer for
assistance.
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.
Thermostat Operation
See the thermostat homeowner manual for instructions on
how to operate your thermostat.
Heat Pump Operation
Your new Lennox heat pump has several characteristics
that you should be aware of:
D Heat pumps satisfy heating demand by delivering large
amounts of warm air into the living space. This is quite
different from gas‐ or oil‐fired furnaces or an electric fur­
nace which deliver lower volumes of considerably hotter
air to heat the space.
D Do not be alarmed if you notice frost on the outdoor coil
in the winter months. Frost develops on the outdoor coil
during the heating cycle when temperatures are below
45F (7C). An electronic control activates a defrost
cycle lasting 5 to 15 minutes at preset intervals to clear
the outdoor coil of the frost.
D During the defrost cycle, you may notice steam rising
from the outdoor unit. This is a normal occurrence. The
thermostat may engage auxiliary heat during the defrost
cycle to satisfy a heating demand; however, the unit will
return to normal operation at the conclusion of the de­
frost cycle.
Extended Power Outage
The heat pump is equipped with a compressor crankcase
heater which protects the compressor from refrigerant
slugging during cold weather operation.
If power to your unit has been interrupted for several hours
or more, set the room thermostat selector to the EMER­
GENCY HEAT setting to obtain temporary heat without the
risk of serious damage to the heat pump.
In EMERGENCY HEAT mode, all heating demand is satis­
fied by auxiliary heat; heat pump operation is locked out.
After a six‐hour compressor crankcase warm‐up period,
the thermostat can be switched to the HEAT setting and
normal heat pump operation may resume.
Preservice Check
If your system fails to operate, check the following before
calling for service:
D Verify room thermostat settings are correct.
D Verify that all electrical disconnect switches are ON.
D Check for any blown fuses or tripped circuit breakers.
D Verify unit access panels are in place.
D Verify air filter is clean.
D If service is needed, locate and write down the unit mod­
el number and have it handy before calling.
Page 20
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