Lennox Merit 13ACD, 13ACD−018, 13ACD−024, 13ACD−030, 13ACD−036 Installation Instructions Manual
...
INSTALLATION
2008 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause personal injury,
loss of life, or damage to property.
Installation and service must be performed by a
licensed professional installer (or equivalent) or a
service agency.
INSTRUCTIONS
Merit® Series13ACD Units
AIR CONDITIONER UNITS
505,366M
01/08
Supersedes 11/07
Table of Contents
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .
13ACD Outdoor Unit 1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information 2. . . . . . . . . . . . . . . . . . . . . . . . . . .
Recovering Refrigerant from Existing System 4. . . . .
Removing Existing Outdoor Unit 5. . . . . . . . . . . . . . . . .
Positioning New Outdoor Unit 5. . . . . . . . . . . . . . . . . . .
New or Replacement Line Set 6. . . . . . . . . . . . . . . . . . .
Brazing Connections 8. . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Indoor Unit Metering Device 9. . . . . . . . . . . .
Installing New Indoor Unit Metering Device 9. . . . . . . .
Testing for Leaks 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evacuating the System 12. . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Unit Delivered Void of Charge 13. . . . . . . . . . .
Electrical Connections 13. . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Charging Procedures 14. . . . . . . . . . . . . . .
System Operation 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Homeowner Information 19. . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Performance Checklist 20. . . . . . . . . . . . .
Litho U.S.A.
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.
IMPORTANT
The Clean Air Act of 1990 bans the intentional
venting of refrigerant (CFCs, HCFCs AND HFCs) as
of July 1, 1992. Approved methods of recovery,
recycling or reclaiming must be followed. Fines
and/or incarceration may be levied for
noncompliance.
Shipping and Packing List
Check the unit for shipping damage and listed times below
are intact. If damaged, or if parts are missing, immediately
contact the last shipping carrier.
1 Assembled outdoor unit
1 Refrigerant flow control kit (Fixed Orifice)
13ACD Outdoor Unit
13ACD Air Conditioners, which will also be referred to in
this instruction as the outdoor unit, uses HCFC−22
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
13ACD Engineering Handbook.
This outdoor unit is designed for use in systems that use
one of the following refrigerant metering devices:
Thermal expansion valve (TXV)
Fixed orifice
01/08 505,366M
*2P0108* *P505366M*
Page 1
Unit Dimensions − inches (mm)
A
B
SIDE VIEW
Model Number A B
13ACD−018 24−1/4 (616) 25−1/4 (641)
13ACD−024 24−1/4 (616) 25−1/4 (641)
13ACD−030 24−1/4 (616) 33−1/4 (845)
13ACD−036 24−1/4 (616) 33−1/4 (845)
13ACD−042 28−1/4 (718) 29−1/4 (743)
13ACD−048 28-1/4 (718) 37−1/4 (946)
13ACD−060 28-1/4 (718) 33−1/4 (845)
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
General Information
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
A
OUTDOOR COIL FAN
COMPRESSOR
SUCTION AND LIQUID LINE
OPTIONAL UNIT STAND-OFF KIT
CONNECTIONS
(4) (FIELD−INSTALLED)
Discharge Air
SIDE VIEW
When servicing or repairing HVAC components, ensure
caps and fasteners are appropriately tightened. Table 1
lists torque values for typical service and repair items.
Table 1. Torque Requirements
Part Recommended Torque
Service valve 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
Gauge port seal cap 8 ft.− lb. 11 NM
USING MANIFOLD GAUGE SETS
When checking the system charge, use a manifold gauge
set that features low−loss anti−blow back fittings. See figure
1 for a typical manifold gauge connection setup.
OPERATING SERVICE VALVES
IMPORTANT
Only use Allen wrenches of sufficient hardness
(50Rc − Rockwell Harness Scale minimum). Fully
insert the wrench into the valve stem recess.
Service valve stems are factory−torqued (from 9
ft−lbs for small valves, to 25 ft−lbs for large valves) to
prevent refrigerant loss during shipping and
handling. Using an Allen wrench rated at less than
50Rc risks rounding or breaking off the wrench, or
stripping the valve stem recess.
The liquid and suction line service valves are typically used
for removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
505366M 01/08
Page 2
OUTDOOR UNIT
(Uncased Coil Shown)
LOW
PRESSURE
GAUGE MANIFOLD
PRESSURE
TO
HFC−410A
DRUM
HIGH
LIQUID LINE
SERVICE VALVE
COMPRESSOR
Figure 1. Typical Manifold Gauge Connection Setup
Each valve is equipped with a service port which has a
factory−installed valve stem.
1/12 TURN
12
1
2
3
4
7
5
6
9
10
8
11
1/6 TURN
12
1
2
3
4
7
5
6
11
10
9
8
Figure 2. Cap Tightening Distances
IMPORTANT
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and
fitted snugly over the cap before tightening.
Operating Angle−Type Service Valve
To Access Angle−Type Service Port:
A service port cap protects the service port core from
contamination and serves as the primary leak seal.
1. Remove service port cap with an appropriately sized
wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap and
tighten as follows:
With Torque Wrench: Finger tighten and then
tighten per table 1.
Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/6 turn clockwise as illustrated in figure 2.
OUTDOOR
COIL
SUCTION LINE
SERVICE VALVE
TXV OR FIXED
ORIFICE
To Open and Close Angle−Type Service Valve:
A valve stem cap protects the valve stem from
contamination and assures a leak−free seal.
1. Remove stem cap with an appropriately sized wrench.
2. Use a service wrench with a hex−head extension
(3/16" for liquid-line valve sizes and 5/16" for
suction-line valve sizes) to back the stem out
counterclockwise as far as it will go.
3. Replace the stem cap and tighten as follows:
With Torque Wrench: Tighten finger tight and then
tighten per table 1.
Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/12 turn clockwise as illustrated in figure 2.
NOTE − A label with specific torque requirements may be
affixed to the stem cap. If the label is present, use the
specified torque.
NOTE− To prevent stripping of the cap, the wrench should
be appropriately sized and fit snugly over the cap before
tightening the cap.
SERVICE PORT CAP
STEM CAP
SERVICE PORT
(VALVE STEM SHOWN
CLOSED) INSERT HEX
WRENCH HERE
SERVICE PORT
CLOSED TO BOTH
INDOOR AND
OUTDOOR UNITS
VALVE STEM
FRONT-SEATED
TO INDOOR
UNIT
TO OUTDOOR UNIT
Figure 3. Angle−Type Service Valve
CORE
(Font−Seated Closed)
Page 3
13ACD SERIES
SERVICE PORT CAP
SERVICE PORT
CORE
OPEN TO BOTH
INDOOR AND
OUTDOOR UNITS
TO INDOOR
UNIT
TO OUTDOOR UNIT
STEM CAP
SERVICE PORT
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
Figure 4. Angle−Type Service Valve
(Back−Seated Opened)
Operating Ball−Type Service Valve
To Access Ball−Type Service Port:
A service port cap protects the service port core from
contamination and serves as the primary leak seal.
OPEN TO LINE SET WHEN VALVE IS CLOSED,
TO BOTH LINE SET AND UNIT WHEN VALVE IS
OPEN.
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CORE
SERVICE PORT CAP
TO OUTDOOR UNIT
TO INDOOR UNIT
BALL (SHOWN
CLOSED)
VALV E
STEM
STEM CAP
To Open and Close Ball−Type Service Valve:
A valve stem cap protects the valve stem from
contamination and assures a leak−free seal.
1. Remove stem cap with a wrench.
2. Use an appropriately sized wrench to open. To open
valve, rotate stem counterclockwise 90°. To close
rotate stem clockwise 90°.
3. Replace the stem cap and tighten as follows:
With Torque Wrench: Finger tighten and then
tighten per table 1.
Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/12 turn clockwise as illustrated in figure 2.
NOTE − A label with specific torque requirements may be
affixed to the stem cap. If the label is present, use the
specified torque.
Recovering Refrigerant from Existing
System
Remove existing HCFC−22 refrigerant using one of the
following methods:
METHOD 1:
Use this method if the existing outdoor unit is not equipped
with manual shut−off valves, and plan on using existing
HCFC−22 refrigerant to flush the system.
NOTE − Use recovery machine instructions for specific
setup requirements.
Perform the following task:
1. Disconnect all power to the existing outdoor unit.
2. Connect to the existing unit a gauge set, clean
recovery cylinder and a recovery machine. Use the
instructions provided with the recover machine on how
to setup the connections.
3. Remove all HCFC−22 refrigerant from the existing
system. Check gauges after shutdown to confirm that
the entire system is completely void of refrigerant.
RECOVERY MACHINE
MANIFOLD GAUGES
Figure 5. Ball−Type Service Valve
1. Remove service port cap with an appropriately sized
wrench.
2. Connect gauge to the service port.
3. When testing is completed, replace service port cap and
tighten as follows:
With Torque Wrench: Finger tighten and then
tighten per table table 1.
Without Torque Wrench: Finger tighten and use an
appropriately sized wrench to turn an additional
1/6 turn clockwise as illustrated in figure 2.
505366M 01/08
Page 4
CLEAN RECOVERY
CYLINDER
OUTDOOR UNIT
Figure 6. Typical Refrigerant Recovery (Method 1)
METHOD 2:
Use this method if the existing outdoor unit is equipped
with manual shut−off valves, and plan on using new
HCFC−22 refrigerant to flush the system.
IMPORTANT: Some system configurations may contain
higher than normal refrigerant charge due to either large
internal coil volumes, and/or long line sets. The following
conditions may cause the compressor to stop functioning:
The following devices could prevent full system charge
recovery into the outdoor unit:
Outdoor unit’s high or low−pressure switches if tripped
can cycled the compressor OFF.
Compressor can stop pumping due to tripped internal
pressure relief valve.
Compressor has internal vacuum protection that is
designed to unload the scrolls (compressor stops
pumping) when the pressure ratio meets a certain
value or when the suction pressure is as high as 20
psig. (Compressor suction pressures should never be
allowed to go into a vacuum. Prolonged operation at
low suction pressures will result in overheating of the
scrolls and permanent damage to the scroll tips, drive
bearings and internal seals).
Once the compressor can not pump down to a lower
pressure due to one of the above system conditions, shut
off the suction valve. Turn OFF the main power to unit and
use a recovery machine to recover any refrigerant left in
the indoor coil and line set.
Perform the following task:
1. Start the existing HCFC−22 system in the cooling
mode and close the liquid line valve.
2. Pump as much of the existing HCFC−22 refrigerant
with the compressor back into the outdoor unit until
you have reached the limitations of the outdoor
system. Turn the outdoor unit main power OFF and
use a recovery machine to remove the remaining
refrigerant in the system.
NOTE − It may be necessary to bypass the low pressure
switches if equipped to ensure complete refrigerant
evacuation.
3. When the low side system pressures reach 0 psig,
close the suction line valve.
4. Check gauges after shutdown to confirm that the
valves are not allowing refrigerant to flow back into the
low side of the system.
*
*
*
*
* SEE NOTES BELOW THIS FIGURE FOR FURTHER DETAILS.
Figure 7. Installation Clearances
NOTES:
Service clearance of 30 in. (762 mm) 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. (914 mm)
Clearance to one of the remaining two sides may be
12 in. (305 mm) and the final side may be 6 in. (152
mm)
48 in. (1219 mm) clearance required on top of unit.
A clearance of 24 in. (610 mm) must be maintained
between two units
POSITIONING CONSIDERATIONS
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
Consider the following when positioning the unit:
Some localities are adopting sound ordinances based
on the unit’s sound level registered from the adjacent
property, not from the installation property. Install the
unit as far as possible from the property line.
When possible, do not install the unit directly outside
a window. Glass has a very high level of sound
transmission. For proper placement of unit in relation
to a window see the provided illustration in figure 8.
INSTALL UNIT AWAY
FROM WINDOWS
Removing Existing Outdoor Unit
Perform the following task at the existing outdoor unit:
Disconnect line set at the service valves.
Disconnect electrical service at the disconnect switch.
Remove old outdoor unit.
Positioning New Outdoor Unit
See Unit Dimensions on page 2 to sizing mounting slab,
platforms or supports. Refer to figure 7 for mandatory
installation clearance requirements.
Page 5
TWO 90° ELBOWS INSTALLED
IN LINE SET WILL REDUCE
LINE SET VIBRATION.
Figure 8. Outside Unit Placement
13ACD SERIES
PLACING OUTDOOR UNIT ON SLAB
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 as
illustrated in figure 9.
BUILDING
STRUCTURE
DISCHARGE AIR
MOUNTING
SLAB
GROUND LEVEL
Figure 9. Ground Level Slab Mounting
Slab may be level or have a slope tolerance away from the
building of not more than two degrees, or two inches per 5
feet (51 mm per 1524 mm) as illustrated in figure 9.
INSTALLING OUTDOOR UNIT ON ROOF
Install the unit a minimum of six 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.
New or Replacement Line Set
This section provides information on new installation or
replacement of existing line set. If a new or replacement
line set is not required, then proceed to Brazing
Connections on page 8.
If refrigerant lines are routed through a wall, seal and
isolate the opening so vibration is not transmitted to the
building. Pay close attention to line set isolation during
installation of any HVAC system. When properly isolated
from building structures (walls, ceilings. floors), the
refrigerant lines will not create unnecessary vibration and
subsequent sounds.
Also, consider the following when placing and installing a
high−efficiency air conditioner:
REFRIGERANT LINE SET
Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (braze connections) to the indoor unit
coil (flare or braze connections). Use Lennox L15 (braze,
non−flare) series line set, or use field−fabricated refrigerant
lines as listed in table 2.
Table 2. Refrigerant Line Set
Model
−018
−024
−030
−036
−042
−048
−060
Field
Connections
Liquid
Line
3/8 in.
(10 mm)
3/8 in.
(10 mm)
3/8 in.
(10 mm)
Suction
Line
3/4 in
(19 mm)
7/8 in
(22 mm)
1−1/8 in.
(29 mm)
Recommended Line Set
Liquid
Line
3/8 in.
(10
mm)
3/8 in.
(10
mm)
3/8 in.
(10
mm)
Suction
Line
3/4 in
(19 mm)
7/8 in
(22 mm)
1−1/8 in.
(29 mm)
L15
Line Sets
L15−41
15 ft. − 50 ft.
(4.6 m − 15 m)
L15−65
15 ft. − 50 ft.
(4.6 m − 15 m)
Field
Fabricated
NOTE − When installing refrigerant lines longer than 50
feet, contact Lennox Technical Support Product
Applications for assistance or Lennox piping manual. To
obtain the correct information from Lennox, be sure to
communicate the following points:
Model (13ACD) and size of unit (e.g. −060).
Line set diameters for the unit being installed as listed
in table 2 and total length of installation.
Number of elbows and if there is a rise or drop of the
piping.
MATCHING WITH NEW OR EXISTING INDOOR COIL
AND LINE SET
The RFC1−metering line consisted of a small bore copper
line that ran from condenser to evaporator coil. Refrigerant
was metered into the evaporator by utilizing
temperature/pressure evaporation effects on refrigerant in
the small RFC line. The length and bore of the RFC line
corresponded to the size of cooling unit.
If the 13ACD is being used with either a new or existing
indoor coil which is equipped with a liquid line which served
as a metering device (RFCI), the liquid line must be
replaced prior to the installation of the 13ACD unit.
Typically a liquid line used to meter flow is 1/4" in diameter
and copper.
505366M 01/08
Page 6
LINE SET ISOLATION
This reference illustrates procedures, which ensure proper
refrigerant line set isolation:
Line set for heat pump applications can not be installed
underground. For more information see the Lennox
Refrigerant Piping Design and Fabrication Guidelines, or
contact Lennox Technical Support Product Applications
for assistance.
Installation of line set on horizontal runs is
illustrated in figure 10.
Installation of line set on vertical runs is illustrated in
figure 11.
IMPORTANT - REFRIGERANT LINES
OUTSIDE WALL
WOOD BLOCK
BETWEEN STUDS
NOTE − Similar installation
practices should be used if
line set is to be installed on
exterior of outside wall.
MUST NOT CONTACT WALL.
SUCTION LINE
LIQUID LINE
WIRE TIE
INSIDE WALL
STRAP
SLEEVE
WIRE TIE
Installation of a transition from horizontal to
vertical is illustrated in figure 12.
TO HANG LINE SET FROM JOIST OR
RAFTER, USE EITHER METAL STRAPPING
MATERIAL OR ANCHORED HEAVY NYLON
WIRE TIES.
STRAPPING MATERIAL
(AROUND SUCTION
LINE ONLY)
FLOOR JOIST OR
ROOF RAFTER
TAPE OR
WIRE TIE
8 FEET
FLOOR JOIST OR
ROOF RAFTER
METAL
SLEEVE
STRAP THE SUCTION LINE TO
THE JOIST OR RAFTER AT 8 FEET
INTERVALS THEN STRAP THE
LIQUID LINE TO THE SUCTION
LINE.
8 FEET
Figure 10. Refrigerant Line Set: Installing Horizontal
Runs
ANCHORED HEAVY
NYLON WIRE TIE
WIRE TIE
(AROUND
SUCTION LINE
ONLY)
TAPE OR
WIRE TIE
WOOD BLOCK
WIRE TIE
STRAP
SLEEVE
SUCTION LINE WRAPPED
WITH ARMAFLEX
IMPORTANT!
REFRIGERANT
LINES MUST NOT
CONTACT
STRUCTURE.
PVC
PIPE
OUTSIDE
WALL
LIQUID LINE
FIBERGLASS
INSULATION
CAULK
Figure 11. Refrigerant Line Set: Installing Vertical
Runs (New Construction Shown)
AUTOMOTIVE
MUFFLER-TYPE HANGER
WALL
STUD
LIQUID LINE
METAL SLEEVE
SUCTION LINE − WRAPPED IN
ARMAFLEX
Figure 12. Refrigerant Line Set: Transition from Vertical to Horizontal
STRAP LIQUID LINE
TO SUCTION LINE
Page 7
WALL
STUD
METAL SLEEVE
STRAP LIQUID LINE TO
SUCTION LINE
LIQUID LINE
SUCTION LINE − WRAPPED IN
ARMAFLEX
13ACD SERIES
1
2
3
CUT AND DEBUR
7
INSTALL CORE ONLY FOR
BOTH SERVICE PORTS AFTER
THEY HAVE COOLED.
INDOOR UNIT
6
BRAZE LINE SET
REMOVE CAP AND CORE FROM
BOTH LIQUID AND SUCTION
SERVICE PORTS
SERVICE PORT MUST BE
OPEN TO ALLOW EXIT
POINT FOR NITROGEN
SUCTION LINE
LIQUID LINE
Figure 13. Brazing Connections
Brazing Connections
Use the following procedure to braze the line set to the new
outdoor unit. Figure 13 is provided as a general guide for
preparing to braze the line set to the outdoor unit.
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.
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).
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. Remove service cap and core from both the suction
and liquid line service ports.
ATTACH
GAUGES
SERVICE
5
VALVE
SERVICE
VALVE
OUTDOOR
UNIT
FLOW NITROGEN
NITROGEN
4
WRAP
SERVICE
VALV E
3. Connect gauge low pressure side to liquid line service
valve.
4. To protect components during brazing, wrap a wet
cloth around the liquid line service valve body and
copper tube stub and use another wet cloth
underneath the valve body to protect the base paint.
5. Flow regulated nitrogen (at 1 to 2 psig) through the
refrigeration gauge set into the valve stem port
connection on the liquid line service valve and out of
the valve stem port connection on the suction service
valve. The TXV metering device at the indoor unit coil
will allow low pressure nitrogen to flow through the
system.)
NOTE − The fixed orifice or TXV metering device at the
indoor unit will allow low pressure nitrogen to flow through
the system.)
NOTE − Use silver alloy brazing rods with five or six percent
minimum silver alloy for copper−to−copper brazing or 45
percent silver alloy for copper−to−brass or copper−to−steel
brazing.
6. Braze the line to the liquid line service valve. Turn off
nitrogen flow.
IMPORTANT
Repeat procedure starting at paragraph 4 for brazing the
suction line to service port valve.
7. After all connections have been brazed, disconnect
manifold gauge set the from service ports and remove
wrapping. Reinstall the service port core for both of the
outdoor unit’s service valves.
505366M 01/08
Page 8
Removing Indoor Unit Metering Device
Remove the existing HCFC−22 refrigerant flow control
orifice or thermal expansion valve from the indoor coil.
REPLACEMENT PARTS
If replacement parts are necessary for the indoor unit,
order kit 69J46. The kit includes:
10 Brass nuts for liquid line assemblies
20 Teflon rings
10 Liquid line orifice housings
10 Liquid line assemblies
TYPICAL TXV REMOVAL PROCEDURE
(Uncased Coil Shown)
TWO PIECE
PATCH PLATE
(UNCASED COIL
ONLY)
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
LIQUID LINE
ORIFICE HOUSING
EQUALIZER
LINE
STUB END
TEFLON
RING
TXV
TEFLON
RING
SENSING
LINE
LIQUID LINE ORIFICE HOUSINGS (10)
TEFLON RINGS (20)
LIQUID LINE ASSEMBLIES
(INCLUDES STRAINER) (10)
BRASS NUTS (10)
LIQUID LINE
ASSEMBLY
PISTON
RETAINER
STRAINER
COPPER
TUBE
Figure 14. 69J46 Kit Components
TYPICAL FIXED ORIFICE REMOVAL PROCEDURE
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR
ASSEMBLY
TEFLON RING
FIXED
ORIFICE
REMOVE AND DISCARD
VALVE STEM ASSEMBLY
(IF PRESENT)
BRASS NUT
LIQUID LINE ASSEMBLY
WITH BRASS NUT
MALE EQUALIZER LINE
FITTING
SENSING BULB
SUCTION
LINE
LIQUID
LINE
Figure 16. Typical TXV Removal
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps holding the liquid line
and distributor assembly.
3. Disconnect the equalizer line from the TXV equalizer
line fitting on the suction line.
4. Remove the suction line sensing bulb as illustrated in
figure 16.
5. Disconnect the liquid line from the TXV at the liquid line
assembly.
6. Disconnect the TXV from the liquid line orifice housing.
Take care not to twist or damage distributor tubes
during this process.
7. Remove and discard TXV and the two Teflon rings as
illustrated in figure 16.
VALVE STEM
VALVE STEM CAP
(Uncased Coil Shown)
Figure 15. Typical Fixed Orifice Removal
1. On fully cased coils, remove the coil access and
plumbing panels.
2. Remove any shipping clamps holding the liquid line
and distributor assembly.
3. Using two wrenches, disconnect liquid line from liquid
line orifice housing. Take care not to twist or damage
distributor tubes during this process.
4. Remove and discard fixed orifice, valve stem
assembly if present and Teflon ring as illustrated in
figure 15.
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
Installing New Indoor Unit Metering
Device
13ACD units can be configured for use in with HCFC−22
fixed orifice or TXV metering devices. This section
provides instructions on installing either a fixed orifice or
TXV refrigerant metering device.
1/8 TURN
10
8
11
12
7
6
Page 9
9
12
11
10
8
7
1
2
3
9
4
5
6
Figure 17. Tightening Distance
1/2 TURN
1
2
3
4
5
13ACD SERIES
TYPICAL FIXED ORIFICE INSTALLATION
PROCEDURE
1. Installed the provided RFC orifice that was supplied
with the outdoor unit as illustrated in figure 18.
2. Ensure that the fixed orifice supplied with the outdoor
unit is installed with the nylon seat pointing toward the
liquid line orifice housing.
3. Apply a small amount of refrigerant oil on the Teflon
ring and insert securely into the liquid line orifice
housing.
4. Attach the liquid line assembly 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 figure 17, or 20 ft−lb.
5. Place the supplied fixed orifice sticker on the indoor
cabinet after installation.
LIQUID LINE ORIFICE HOUSING
FIXED
ORIFICE
TEFLON
WASHER
1 Fixed orifice extractor
1 Teflon ring
1 Fixed orifice sticker
FIXED ORIFICE (1)
FIXED ORIFICE
EXTRACTOR (1)
TEFLON RING (1)
FIXED ORIFICE STICKER (1)
LIQUID
LINE
LIQUID LINE ASSEMBLY
WITH BRASS NUT
(Uncased Coil Shown)
Figure 18. Typical Fixed Orifice Installation
Se e the 13ACD Engineering Handbook for approved TXV
indoor/outdoor unit match−ups and application
information. Table 4 lists both the Lennox catalog and part
numbers for the TXV kit required for each unit model.
Figure 19 illustrates the kit components and quantities.
Table 3. Indoor Fixed Orifice Kits
Catalog
Model
018 10W95 100484−07 0.055
024 98M12 100484−12 0.062
030 11W00 100484−16 0.067
036 98M78 100484−24 0.076
042 10W86 100484−28 0.080
048 98M14 100484−36 0.089
060 98M15 100484−45 0.099
Use the Lennox catalog number to order a new or replacement fixed
orifice kit.
Number
Part Number Drill Size
The kit includes:
1 Fixed orifice
Figure 19. Fixed Orifice Kit Components
TYPICAL TXV INSTALLATION PROCEDURE
The TXV unit 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 TXV in a
manner that will provide access for field servicing of the
TXV. Refer to Figure 20 for reference during installation of
TXV unit.
1. Install one of the provided Teflon rings around the
stubbed end of the TXV and lightly lubricate the
connector threads and expose surface of the Teflon
ring with refrigerant oil.
2. Attach the stubbed end of the kit 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 figure 17, or 20 ft−lb.
3. Place the remaining Teflon washer around the other
end of the TXV. Lightly lubricate connector threads
and expose surface of the Teflon ring with refrigerant
oil.
4. Attach the liquid line assembly to the TXV. Finger
tighten and use an appropriately sized wrench to turn
an additional 1/2 turn clockwise as illustrated in figure
17, or 20 ft−lb.
5. Attach the suction line sensing bulb in the proper
orientation as illustrated in figure 21 using the clamp
an screws provided.
NOTE − Insulating the sensing bulb once installed may be
required when the bulb location is external to the coil
casing.
505366M 01/08
Page 10
TWO PIECE
PATCH PLATE
(UNCASED COIL
ONLY)
DISTRIBUTOR
TUBES
(Uncased Coil Shown)
LIQUID LINE
ORIFICE
HOUSING
STUB END
TXV
TEFLON
RING
FLARE SEAL
CAP
OR
FLARE NUT
COPPER
FLARE SEAL
BONNET
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING (SEE
FIGURE 22 FOR
FURTHER DETAILS)
EQUALIZER
LINE
Sensing bulb insulation is
required if mounted external to
the coil casing. See figure 21 for
bulb positioning.
Figure 20. Typical TXV Installation
Suction Line
Bulb
TEFLON
RING
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SENSING
LINE
Figure 22. Copper Flare Seal Bonnet Removal
7. Connect the equalizer line from the TXV to the
MALE BRASS EQUALIZER
LINE FITTING
SUCTION LINE
equalizer suction port on the suction line. Finger
tighten the flare nut plus 1/8 turn (7 ft−lbs) as illustrated
in figure 17.
SUCTION
LINE
NOTE − To prevent any possibility of water damage,
properly insulate all parts of the TXV assembly that may
LIQUID
LINE
sweat due to temperature differences between the valve
and its surrounding ambient temperatures.
See the 13ACD Engineering Handbook for approved TXV
match−ups and application information.
Table 4. Indoor TXV Indoor Kits
Model
Catalog
Number
−018, −024, −030 and −036 26K34 LB−85663J
On lines smaller than
7/8", mount sensing bulb
at either the 3 or 9 o’clock
position.
12
Bulb
−042, −048 and −060 26K35 LB−85663k
Use the Lennox catalog number to order a TXV kit.
The above reference kits include:
1 TXV
2 Teflon rings
Part
Number
1 1 1/4" wide copper mounting strap for sensing bulb
2 #10 hex head bolts and nuts for securing sensing bulb
Suction Line
On 7/8" and larger lines,
mount sensing bulb at
either the 4 or 8 o’clock
position. never mount on
12
Bulb
bottom of line.
Bulb
NOTE − Never mount on bottom of line.
Figure 21. TXV Sensing Bulb Installation
6. Remove and discard either the flare seal cap or flare
nut with copper flare seal bonnet from the equalizer
line port on the suction line as illustrated in figure 22.
IMPORTANT
When removing the brass nut, ensure that the
copper flare seal bonnet is removed.
Page 11
TXV (1)
HEX HEAD BOLTS
AND NUTS (2)
TEFLON
RINGS (2)
COPPER
MOUNTING
STRAP (1)
Figure 23. TXV Kit Components
Testing for Leaks
IMPORTANT
Leak detector must be capable of sensing HFC
refrigerant.
13ACD SERIES
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.
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.
After the line set has been connected to both the indoor
and outdoor units, check the line set connections at both
the indoor and outdoor units unit for leaks. Use the
following procedure to test for leaks:
1. Connect an HCFC−22 manifold gauge set high
pressure hose to the suction valve service port.
NOTE − Normally, the high pressure hose is connected to
the liquid line port; however, connecting it to the suction
port better protects the manifold gauge set from high
pressure damage.
2. With both manifold valves closed, connect the cylinder
of HCFC−22 refrigerant to the center port of the
manifold gauge set. Open the valve on the HCFC−22
cylinder (suction only).
3. Open the high pressure side of the manifold to allow
HCFC−22 into the line set and indoor unit.
4. Weigh in a trace amount of HCFC−22. [A trace amount
is a maximum of two ounces (57 g) refrigerant or three
pounds (31 kPa) pressure].
5. Close the valve on the HCFC−22 cylinder and the valve
on the high pressure side of the manifold gauge set.
6. Disconnect the HCFC−22 cylinder.
7. Connect a cylinder of dry nitrogen with a pressure
regulating valve to the center port of the manifold
gauge set.
NOTE − Amounts of refrigerant will vary with line lengths.
8. Adjust dry nitrogen pressure to 150 psig (1034 kPa).
9. Open the valve on the high side of the manifold gauge
set in order to pressurize the line set and the indoor unit.
10. 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.
11. Check all joints for leaks.
12. Purge dry nitrogen and HFC−410A mixture.
13. Correct any leaks and recheck.
14. After leak testing disconnect gauges from service
ports.
Evacuating the System
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.
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.
Evacuating the system of non−condensables is critical for
proper operation of the unit. Non−condensables are
defined as any gas that will not condense under
temperatures and pressures present during operation of
an air conditioning system. Non−condensables and water
suction combine with refrigerant to produce substances
that corrode copper piping and compressor parts.
1. Connect manifold gauge set to the service valve ports
as follows:
low pressure gauge to suction line service valve
high pressure gauge to liquid line service valve
2. Connect micron gauge.
3. Connect the vacuum pump (with vacuum gauge) to
the center port of the manifold gauge set.
4. Open both manifold valves and start the vacuum
pump.
5. 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 to
determine if there is a rapid rise in sure 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.
6. 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.
505366M 01/08
Page 12
NOTE − A complete unit wiring diagram is located inside the unit control box cover.
Figure 24. Typical Wiring Diagram
7. 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.
8. 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.
9. 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
HCFC−22 refrigerant. Open the manifold gauge valve
1 to 2 psig in order to release the vacuum in the line set
and indoor unit.
10. Close manifold gauge valves and shut off the
HCFC−22 cylinder and remove the manifold gauge
set.
Servicing Unit Delivered Void of Charge
If the system is void of refrigerant, clean the system using
the procedure described below.
1. Use nitrogen to pressurize the system and check for
leaks. Repair all leaks.
2. Evacuate the system to remove as much of the
moisture as possible.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again. Then, weigh the
appropriate amount of HCFC−22 refrigerant as listed
on unit nameplate into the system.
5. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the filter drier several times to achieve the
required dryness level. If system dryness is not
verified, the compressor will fail in the future.
Electrical Connections
WARNING
Electric Shock Hazard. Can cause
injury or death.
Line voltage is present at all
components on units with single-pole
contactors, even when unit is not in
operation!
Unit may have multiple power
supplies. Disconnect all remote
electric power supplies before
opening access panel.
Unit must be grounded in accordance
with national and local codes.
Refer to the indoor unit installation instruction for additional
wiring application diagrams and refer to unit nameplate for
minimum circuit ampacity and maximum overcurrent
protection size. Figures 26 and 24 illustrate typical outdoor
unit wiring diagrams for the 13ACD series heat pumps.
In the U.S.A., wiring must conform with current local
codes and the current National Electric Code (NEC).
Page 13
13ACD SERIES
In Canada, wiring must conform with current local codes
and the current Canadian Electrical Code (CEC).
HIGH VOLTAGE
FIELD WIRING
WIRE TIES
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
THERMOSTAT INDOOR UNIT
W1
R
Y
G
POWER
HEAT
COOLING
INDOOR
BLOWER
R
W
Y
G
OUTDOOR
UNIT
Y1
GROMMET
Figure 25. Separating High/Low Voltage Field Wiring
(Typical Field Wiring)
WIRING CONNECTIONS
1. Install line voltage power supply to unit from a properly
sized disconnect switch. Any excess high voltage field
wiring should be trimmed or secured away from the
low voltage field wiring.
2. Ground unit at unit disconnect switch or to an earth
ground.
3. Connect conduit to the unit using provided conduit
bushing.
4. Install room thermostat (ordered separately) on an
inside wall approximately in the center of the
conditioned area and five 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.
NOTE − For proper voltages, select thermostat wire gauge
per the following table:
Table 5. Wire Run Lengths
Wire run length AWG # Insulation type
Less than 100 feet (30 m) 18
More than 100 feet (30 m) 16
Color−coded with a minimum
temperature rating of 35ºC.
5. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit as illustrated in
figures 26 and 24.
6. Do not bundle any excess 24VAC control wire inside
control box. Run control wire through installed wire tie
and tighten wire tie to provided low voltage strain relief
and to maintain separation of field installed low and
high voltage circuits.
NOTE − 24VAC, Class II circuit connections are made in
the low voltage junction box
NOTE − Units are approved for use only with copper
conductors.
NOTE − To facilitate conduit, a hole is in the bottom of the
control box. Connect conduit to the control box using a
proper conduit fitting.
NOTE − See unit wiring diagram for power supply
connections. If indoor unit is not equipped with blower
relay. It must be field−provided and installed (P−8−3251 or
equivalent)
COMMON
C
C
C
Figure 26. Typical Field Low Voltage Wiring
Start−Up and Charging Procedures
IMPORTANT
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start−up to
prevent compressor damage as a result of slugging.
1. Rotate fan to check for binding.
2. Inspect all factory− and field−installed wiring for loose
connections.
3. After evacuation is complete, open the liquid line and
suction line service valves to release the refrigerant
charge (contained in outdoor unit) into the system.
4. Replace the stem caps and tighten as specified in
Operating Service Valves on page 2.
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 with the power company and the
voltage condition has been corrected.
6. Set the thermostat for a cooling demand. Turn on
power to the indoor indoor unit 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.
8. Check system for sufficient refrigerate by using the
procedures listed under Testing and Charging
System.
SETTING UP TO CHECK CHARGE
1. Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of HCFC−22.
2. Connect the manifold gauge set to the unit’s service
ports as illustrated in figure 1.
low pressure gauge to suction service port
high pressure gauge to liquid service port
INDOOR AIRFLOW CHECK
Check airflow using the Delta−T (DT) process using the
illustration in figure 27.
DETERMINING CHARGE METHOD
Use the illustration in figure 28 to determine the correct
charging method.
505366M 01/08
Page 14
Temp.
of air
entering
indoor
coil ºF
A
Wet−bulb ºF
53º
DRY
BULB
80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
Dry−bulb
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
57 58 59 60 61 62 63 64 65 66 67 68 69 70
T
C
Drop
19º
All temperatures are
expressed in ºF
Delta−T
air flowair flow
INDOOR
COIL
B
B
64º
Figure 27. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart
START: Determine how refrigerant is metered
WHEN TO CHARGE?
Warm weather best
Can charge in colder weather
CHARGE METHOD? Determine by:
Metering device type
Outdoor ambient temperature
REQUIREMENTS:
Sufficient heat load in structure
Indoor temperature between 70-80ºF (21−26ºC)
Manifold gauge set connected to unit
Thermometers:
− to measure outdoor ambient temperature
− to measure liquid line temperature
− to measure suction line temperature
Figure 28. Determining Charge Method
A
72º
DRY
BULB
WET
BULB
APPROACH OR
SUBCOOLING
1. Determine the desired DTMeasure entering air temperature
using dry bulb (A) and wet bulb (B). DT is the intersecting value of A
and B in the table (see triangle).
2. Find temperature drop across coilMeasure the coil’s dry bulb
entering and leaving air temperatures (A and C). Temperature Drop
Formula: (T
3. Determine if fan needs adjustmentIf the difference between the
measured T
justment is needed. See examples: Assume DT = 15 and A temp. =
72º, these C temperatures would necessitate stated actions:
Cº T
53º 19 – 15 = 4 Increase the airflow
58º 14 – 15 = −1 (within +3º range) no change
62º 10 – 15 = −5 Decrease the airflow
4. Adjust the fan speedSee indoor unit instructions to increase/de-
crease fan speed.
Changing air flow affects all temperatures; recheck temperatures to
confirm that the temperature drop and DT are within +3º.
) = A minus C.
Drop
and the desired DT (T
Drop
– DT = ºF ACTION
Drop
TXV RFC
Which
Drop
–DT) is within +3º, no ad-
metering
device?
Above 65ºF
(18ºC)?
Below 65ºF
(18ºC)?
Above 40ºF
(4ºC)?
WEIGH-IN SUPERHEAT
START: Measure outdoor ambient temperature
USE EITHER APPROACH
OR SUBCOOLING
METHOD
ABOVE
WEIGH IN TXV/RFC
Refrigerant Charge per Line Set Length
Liquid Line
Set Diameter
3/8" (9.5 mm)
NOTE − *If line length is greater than 15 ft. (4.6 m), add this
amount. If line length is less than 15 ft. (4.6 m), subtract this
amount.
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3 ounce per 5’ (85 g per 1.5 m)
Figure 29. HCFC−22 Weigh In TXV Method
Above or
below 65ºF
(18ºC)?
Page 15
BELOW
1. Check Liquid and suction line pressures
2. Compare unit pressures with Table 6,
Normal Operating Pressures.
3. Conduct leak check; evacuate as
previously outlined.
4. Weigh in the unit nameplate charge plus
any charge required for line set differences
over feet.
This nameplate is for illustration purposes
only. Go to actual nameplate on outdoor
unit for charge information.
13ACD SERIES
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
DO NOT CHARGE UNIT
Weigh-in or remove refrigerant
(Results of charging at low
based upon line length
temperatures not reliable)
If refrigerant added or
removed, verify charge using
the approach method
If value is greater than shown,
remove refrigerant; if less than
shown, add refrigerant
BLOCK OUTDOOR COIL: [sometimes necessary with
lower temperatures] Use cardboard or plastic sheet to
restrict the airflow through the outdoor coil to achieve
pressures from 200−250 psig (1379−1724 kPa). Higher
pressures are needed to check charge. Block equal
sections of air intake panels and move coverings sideways
until the liquid pressure is in the above noted ranges.
BELOW
Outdoor
Ambient 65ºF
(18ºC)?
SCº (Subcooling) Values (F:+/−1.0° [C: +/−0.6°])
ºF (ºC)* −018 −024 −030 −036 −042 −048 −060
Any 7 (3.8) 12 (6.7) 9 (5) 10 (5.6) 14 (8) 10 (5.6) 13 (7.2)
*Temperature of air entering outdoor coil
ABOVE
1. Confirm proper airflow across coil using figure
27.
2. Compare unit pressures with Table 6, Normal
Operating Pressures.
3. Use SUBCOOLING to correctly charge unit or to
verify the charge is correct.
4. Set thermostat to call for heat (must have a
cooling load between 70-80ºF (21−26ºC)
5. Connect gauge set
6. Measure outdoor ambient temperature
7. When heat demand is satisfied, set thermostat to
call for cooling
8. Allow temperatures and pressures to stabilize.
NOTE − If necessary, block outdoor coil to
maintain 325 − 375 psig.
9. Record line temperature:
LIQº = ______
10. Measure liquid line pressure and use the value to
determine saturation temperature:
SATº = ______
11. Subtract to determine subcooling (SCº):
SATº_____ − LIQº _____ = SCº _____
12. Compare results with table to the left.
Figure 30. HCFC−22 Subcooling TXV Charge
START: Measure outdoor ambient temperature
DO NOT CHARGE UNIT
USE WEIGH-IN METHOD
(Results of charging at low
Weigh-in or remove refriger-
temperatures not reliable)
ant based upon line length
If value is greater than shown (high
approach), add refrigerant; if less than
shown (liquid temp too close to ambient
temp, low approach), remove
refrigerant.
BELOW
Outdoor
Ambient 65ºF
(18ºC)?
If refrigerant added or removed,
retest to confirm that unit is
properly charged
APPº (Approach) Values(F:+/−1.0° [C: +/−0.6°])
Any) 6 (3.3) 6 (3.3) 8 (4.4) 12 (6.7) 5 (2.8) 6 (3.3) 7 (3.8)
*Temperature of air entering outdoor coil
Figure 31. HCFC−22 Approach TXV Charge
ABOVE
1. Confirm proper airflow across coil using figure
27.
2. Compare unit pressures with Table 6, Normal
Operating Pressures.
3. Use APPROACH to correctly charge unit or to
verify the charge is correct.
4. Set thermostat to call for heat (must have a
cooling load between 70-80ºF (21−26ºC).
5. Connect gauge set.
6. When heat demand is satisfied, set thermostat
to call for cooling.
7. Allow temperatures and pressures to stabilize.
8. Record outdoor ambient temperature:
AMBº =_________
9. Record line temperature:
LIQº = __________
10. Subtract to determine approach (APPº):
LIQº_____ − AMBº _____ = APPº_____
11. Compare results with table to the left.ºF (ºC)* −018 −024 −030 −036 −042 −048 −060
505366M 01/08
Page 16
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
Weigh-in or remove refrigerant
based upon line length
BELOW
SHº (Superheat) Values (+/−5ºF)
Wet Bulb (air entering indoor coil)
ºF* 50 52 54 56 58 60 62 64 66 68 70 72 74 76
40 15 18 20 23 26 29 32 34 38 41 43 46 48 51
45 13 16 18 21 24 27 30 33 36 39 41 44 46 49
50 11 14 16 19 22 25 28 31 34 37 39 42 44 47
55 9 12141720232730333638404244
If refrigerant added or
removed, retest to confirm
that unit is properly
charged
If value is greater than
shown, add refrigerant; if
less than shown, remove
refrigerant.
60 7 10121518212427303335384043
65 - 6 10 13 16 19 21 24 27 30 33 36 38 41
70 - - 7 1013161921242730333639
75 - - - 6 9 121518212428313437
80 - - - - 5 8 12 15 18 21 25 28 31 35
85 - - - - - - 8 11 15 19 22 26 30 33
90 - - - - - - 5 9 131620242731
95 - - - - - - - 6 101418222529
100 --------81216212428
105 --------5913172226
110 ---------611152025
115 ----------8141824
* Dry−bulb temperature (ºF) of entering outdoor ambient air.
ABOVE
Outdoor
Ambient 40ºF
(4ºC)?
1. Confirm proper airflow across coil using figure 27.
2. Compare unit pressures with Table 6, Normal
Operating Pressures.
3. Use SUPERHEAT to correctly charge unit or to
verify the charge is correct.
4. Set thermostat to call for heat (must have a cooling
load between 70-80ºF (21−26ºC)
5. Connect gauge set.
6. When heat demand is satisfied, set thermostat to
call for cooling.
7. Allow temperatures and pressures to stabilize.
8. Measure the suction line pressure and use the use
value to determine saturation temperature:
SATº =_________
9. Record suction line temperature:
VAPº =_________
10. Subtract to determine superheat (SHº):
VAPº − _____ SATº ______ = SHº______
11. Record the wet bulb temperature (air entering
indoor coil):
WB =_______
12. Record outdoor ambient temperature.
13. Compare results with table to the left.
NOTE − Do not attempt to charge system where a
dash appears, system could be overcharged.
Superheat is taken at suction line service port.
Suction line superheat must never be less than 5ºF
at the suction line service port.
Figure 32. HCFC−22 Superheat RFC Charge
Page 17
13ACD SERIES
Table 6. HCFC−22 Normal Operating Pressures (Liquid +10 and Suction +5 psig)
IMPORTANT
Use this table to perform maintenance checks; it 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.
13ACD
5F (5C)*
Expansion Valve (TXV)
65 (18) 138 / 79 148 / 79 147 / 75 155 / 79 147 / 78 144 / 77 152 / 73
70 (21) 148 / 80 160 / 79 159 / 75 169 / 80 158 / 78 152 / 77 164 / 75
75 (24) 160 / 80 174 / 80 172 / 76 183 / 81 172 / 79 163 / 78 177 / 77
80 (27) 174 / 81 188 / 81 186 / 77 199 / 81 189 / 79 179 / 78 192 / 78
85 (29) 188 / 81 203 / 81 201 / 77 215 / 82 205 / 80 195 / 79 208 / 79
90 (32) 204 / 81 220 / 82 216 / 78 233 / 82 222 / 81 212 / 80 225 / 80
95 (35) 219 / 82 236 / 83 233 / 79 252 / 83 241 / 81 229 / 80 243 / 80
100 (38) 236 / 82 253 / 83 250 / 80 271 / 83 259 / 82 245 / 81 261 / 81
105 (41) 253 / 83 272 / 84 268 / 80 291 / 84 279 / 82 265 / 81 280 / 82
110 (43) 272 / 84 291 / 85 287 / 81 311 / 85 299 / 83 287 / 82 299 / 83
115 (45) 291 / 84 311 / 85 306 / 82 331 / 86 320 / 84 309 / 83 320 / 83
Fixed Orifice (RFC)
65 (18) 139 / 67 147 / 71 148 / 65 162 / 75 158 / 72 151 / 71 152 / 68
70 (21) 149 / 70 159 / 73 161 / 67 174 / 76 170 / 75 161 / 73 165 / 71
75 (24) 161 /74 172 / 75 175 / 70 187 / 78 182 / 76 172 / 75 178 / 73
80 (27) 175 / 77 186 / 77 190 / 73 201 / 79 195 / 78 185 / 76 193 / 76
85 (29) 189 / 79 200 / 79 205 / 75 215 / 81 209 / 80 198 / 77 208 / 78
90 (32) 203 / 81 216 / 81 221 / 77 231 / 82 224 / 81 213 / 79 224 / 80
95 (35) 218 / 82 232 / 82 237 / 79 247 / 83 240 / 82 227 / 80 239 / 81
100 (38) 234 / 83 247 / 83 254 / 80 265 / 84 256 / 84 243 / 81 258 / 82
105 (41) 251 / 85 264 / 85 271 / 81 283 / 85 273 / 85 259 / 82 276 / 83
110 (43) 269 / 86 285 / 86 289 / 82 302 / 86 290 / 86 276 / 84 294 / 85
115 (45) 287 / 87 302 / 87 308 / 83 321 / 87 310 / 87 293 / 85 313 / 86
−018 −024 −030 −036 −042 −048 −060
Liquid / Suction Liquid / Suction Liquid / Suction Liquid / Suction Liquid / Suction Liquid / Suction Liquid / Suction
INSTALLING SERVICE VALVE CAPS
Disconnect gauge set and re−install both the liquid and
suction service valve caps.
OUTDOOR UNIT
SERVICE VALVES
INSTALL CAPS
Figure 33. Installing Service Valve Caps
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.
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.
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause personal injury,
loss of life, or damage to property.
Installation and service must be performed by a
licensed professional installer (or equivalent) or a
service agency.
505366M 01/08
Page 18
At the beginning of each cooling season, the system
should be checked as follows:
OUTDOOR UNIT
1. Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
2. Outdoor unit fan motor is pre−lubricated and sealed.
No further lubrication is needed.
3. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
4. Check all wiring for loose connections.
5. Check for correct voltage at unit (unit operating).
6. Check amp draw on outdoor fan motor.
UNIT NAMEPLATE: _________ ACTUAL: __________
7. Inspect drain holes in coil compartment base and
clean if necessary.
NOTE - If insufficient heating or cooling occurs, the unit
should be gauged and refrigerant charge should be
checked.
INDOOR COIL
1. Clean coil if necessary.
2. Check connecting lines, joints and coil for evidence of
oil leaks.
3. Check condensate line and clean if necessary.
INDOOR UNIT
1. Clean or change filters.
2. Blower motors are prelubricated and permanently
sealed. No more lubrication is needed.
3. 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.
4. Belt Drive Blowers − Check belt for wear and proper
tension.
5. Check all wiring for loose connections.
6. Check for correct voltage at unit. (blower operating)
7. Check amp draw on blower motor.
UNIT NAMEPLATE: _________ ACTUAL: __________
OPTIONAL ACCESSORIES
Refer to the Engineering Handbook for optional
accessories that may apply to this unit. The following may
or may not apply:
Homeowner Information
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.
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.
NOTE − A white residue may appear on the coil guards and
grilles on outdoor units. The residue is a non−toxic
byproduct of manufacturing the flexible coating. It can be
removed by wiping the coil guard with a cloth.
9 PINS USED ON −048
AND −060; 6 PINS ALL
OTHERS
PUSH PIN
MESH SCREEN
Figure 34. Cleaning debris from mesh
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:
1. Make sure power is off before cleaning. Clean and
inspect outdoor coil. The coil may be flushed with a
water hose.
2. The outdoor coil is protected by an inner mesh screen
and a wire cage (see figure 34). If debris has collected
between the mesh screen and the coil and cannot be
dislodged by spraying unpressurized water from
inside coil surface to the outside, the mesh may be
removed by first removing the top of the unit which will
allow for removal of the wire cage.
3. Then, using pliers to grip the head of the push pins, pull
straight out to extract the push pins along one side of
the coil. If necessary, remove the push pins along the
back of the unit; it is usually unnecessary to fully
remove the inner mesh screen.
4. Drape the mesh screen back and wash the coil. When
all the debris has been removed from the coil, reinstall
the mesh screen by positioning it in its original position
Page 19
13ACD SERIES
and reinserting the push pin. No tool is required to
push the pin back into the same slot in the fins.
5. If the push pin is loose and tends not to stay in place,
brush the fins with a fin brush (22 fins/in). Line up the
push pin a couple fins to the right or left of the original
hole and re−insert the pin.
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
Fan Switch In AUTO or INT (intermittent) mode, the blower
System Switch Set the system switch for heating, cooling or auto
Temperature
Indicator
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.
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.
operation. The auto mode allows the system to
automatically switch from heating mode to cooling
mode to maintain predetermined comfort settings.
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 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 the system switch are properly set.
Replace any blown fuses, or reset circuit breakers.
Make sure unit access panels are in place.
Make sure air filter is clean.
Locate and record unit model number before calling.
Optional Accessories
Refer to the Lennox 13ACD Engineering Handbook for the
latest available accessories for this unit. Below is a list of
accessories available at the time this instruction was
publish.
Optional Accessory Catalog Number Part Number
Compressor Start Kit 10J42 LB−31200BM
Loss of Charge Kit 94J47 LB−87620A
Sound Cover 69J03 69J0301
Replacement Liquid Line Drier 12L71 12L7101
Plastic Feet Kit 94J45 LB−87156A
Crankcase Heater − 40W 93M04 100499−01
High Pressure Kit 94J46 LB−87620A
Start−Up and Performance Checklist
Job Name Job no. Date
Job Location City State
Installer City State
Unit Model No. Serial No. Service Technician
Nameplate Voltage
Rated Load Ampacity Compressor Outdoor Fan
Maximum Fuse or Circuit Breaker
Electrical Connections Tight? Indoor Filter clean? Supply Voltage (Unit Off)
Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.
Discharge Pressure Suction Pressure Refrigerant Charge Checked?
Refrigerant Lines: Leak Checked? Properly Insulated? Outdoor Fan Checked?
Service Valves: Fully Opened? Caps Tight? Thermostat
Voltage With Compressor Operating Calibrated? Properly Set? Level?
505366M 01/08
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