Lennox International Inc Air Conditioner 506945 01 User Manual

INSTALLATION  
INSTRUCTIONS  
E2013 Lennox Industries Inc.  
Dallas, Texas, USA  
Merit® Series 13ACX Units  
AIR CONDITIONER  
506945-01  
5/2013  
Supersedes 7/2012  
Litho U.S.A.  
WARNING  
THIS MANUAL MUST BE LEFT WITH THE  
HOMEOWNER FOR FUTURE REFERENCE  
Improper installation, adjustment, alteration, service or  
maintenance can cause personal injury, loss of life, or  
damage to property.  
WARNING  
Installation and service must be performed by a licensed  
professional installer (or equivalent) or a service agency.  
The State of California has determined that this product  
may contain or produce a chemical or chemicals, in very  
low doses, which may cause serious illness or death. It  
may also cause cancer, birth defects, or reproductive  
harm.  
CAUTION  
Before attempting to perform any service or maintenance,  
turn the electrical power to unit OFF at disconnect switch.  
GENERAL  
This 13ACX outdoor unit is designed for use with HFC-410A  
refrigerant only. This unit must be installed with an approved  
indoor unit. See the Lennox 13ACX Product Specifications  
bulletin (EHB) for approved indoor component match ups.  
CAUTION  
As with any mechanical equipment, contact with sharp  
sheet metal edges can result in personal injury. Take care  
while handling this equipment.  
These instructions are intended as a general guide and do  
not supersede local codes in any way. Consult authorities  
having jurisdiction before installation.  
STEP 1 -- SETTING THE UNIT -- Clearances  
MINIMUM CLEARANCE  
ABOVE UNIT  
CLEARANCE ON ALL SIDES — INCHES (MILLIMETERS)  
6 (152)  
NOTES:  
48 (1219)  
S
S
Clearance to one of the other three  
sides must be 36 inches (914mm).  
30 (762)  
12 (305)  
Clearance to one of the remaining  
two sides may be 12 inches  
(305mm) and the final side may be  
6 inches (152mm).  
LINE SET  
CONNECTIONS  
36 (914)  
MINIMUM CLEARANCE BETWEEN TWO UNITS  
ACCESS  
PANEL  
24 (610)  
LINE SET  
CONNECTIONS  
FIGURE 1  
7/2012  
506945-01  
Page 1  
*2P72012*  
*P506945-01*  
Download from Www.Somanuals.com. All Manuals Search And Download.  
IMPORTANT — Refrigerant lines must not contact structure.  
LINE SET  
Line Set Isolation — The following illustrations are  
examples of proper refrigerant line set isolation:  
INSTALLATION  
REFRIGERANT LINE SET — INSTALLING  
VERTICAL RUNS (NEW CONSTRUCTION SHOWN)  
NOTE — Insulate liquid line when it is routed through areas where the  
surrounding ambient temperature could become higher than the  
temperatureof the liquid line or when pressure drop is equal to or greater  
than 20 psig.  
REFRIGERANT LINE SET — TRANSITION  
FROM VERTICAL TO HORIZONTAL  
ANCHORED HEAVY NYLON  
IMPORTANT — Refrigerant lines must not contact wall  
WIRE TIE OR AUTOMOTIVE  
MUFFLER‐TYPE HANGER  
AUTOMOTIVE  
MUFFLER‐TYPE HANGER  
OUTSIDE WALL  
LIQUID LINE  
VAPOR LINE  
WALL  
STUD  
WIRE TIE  
INSIDE WALL  
STRAP  
WOOD BLOCK  
BETWEEN STUDS  
STRAP LIQUID LINE TO  
VAPOR LINE  
NON-CORROSIVE  
METAL SLEEVE  
WIRE TIE  
LIQUID LINE  
NON-CORROSIVE  
METAL SLEEVE  
WOOD BLOCK  
WIRE TIE  
VAPOR LINE - WRAPPED  
IN ARMAFLEX  
STRAP  
REFRIGERANT LINE SET — INSTALLING  
HORIZONTAL RUNS  
SLEEVE  
To hang line set from joist or rafter, use either metal strapping material  
or anchored heavy nylon wire ties.  
WIRE TIE (AROUND  
VAPOR LINE ONLY)  
VAPOR LINE WRAPPED  
WITH ARMAFLEX  
8 FEET (2.43 METERS)  
OUTSIDE  
WALL  
STRAPPING  
MATERIAL (AROUND  
VAPOR LINE ONLY)  
FLOOR JOIST OR  
LIQUID  
LINE  
ROOF RAFTER  
TAPE OR  
WIRE TIE  
8 FEET (2.43 METERS)  
PVC  
PIPE  
CAULK  
NON-CORROSIVE  
METAL SLEEVE  
FIBERGLASS  
INSULATION  
STRAP THE VAPOR LINE TO THE JOIST  
OR RAFTER AT 8 FEET (2.43 METERS)  
INTERVALS THEN STRAP THE LIQUID  
LINE TO THE VAPOR LINE.  
TAPE OR  
WIRE TIE  
NOTE — Similar installation practices should be used if line set is  
to be installed on exterior of outside wall.  
FLOOR JOIST OR  
ROOF RAFTER  
FIGURE 5  
Page 3  
13ACX SERIES  
Download from Www.Somanuals.com. All Manuals Search And Download.  
STEP 2 -- REFRIGERANT PIPING -- Flushing Existing Line Set and Indoor Coil  
Flush the existing line set per the following  
instructions. For more information, refer to the  
Installation and Service Procedures manual available  
on DaveNet. 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).  
WARNING  
Polyol ester (POE) oils used with HFC-410A  
refrigerant absorb moisture very quickly. It is very  
important that the refrigerant system be kept closed as  
much as possible. DO NOT remove line set caps or  
service valve stub caps until you are ready to make  
connections.  
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  
Application group for assistance.  
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 COMPRES-  
SOR.  
IMPORTANT !  
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 installation. Take  
care to empty all existing traps. Polyol ester (POE)  
oils are used in Lennox units charged with HFC-410A  
refrigerant. Residual mineral oil can act as an insula-  
tor, preventing proper heat transfer. It can also clog  
the expansion device and reduce system perfor-  
mance and capacity.  
LIQUID LINE FILTER DRIER INSTALLATION  
The filter drier (one is shipped with each 13ACX unit) must  
be field installed in the liquid line between the outdoor unit's  
liquid line service valve and the indoor coil's metering device  
must be installed to ensure a clean, moisture-free system.  
Failure to install the filter drier will void the warranty. A  
replacement filter drier is available from Lennox. See  
brazing filter drier connections to the liquid line.  
Failure to properly flush the system per this instruc-  
tion and the detailed Installation and Service Proce-  
dures manual will void the warranty.  
WARNING  
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).  
Typical Liquid Line Filter Drier Installation  
BRAZE CONNECTION POINTS  
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.  
LIQUID  
LINE  
LIQUID LINE  
LINE  
SERVICE VALVE  
LIQUID LINE  
OUTDOOR  
FILTER DRIER  
UNIT  
FIGURE 6  
TABLE 2  
REFRIGERANT LINE SET — INCHES (MM)  
Valve Size Connections  
Recommended Line Sets  
Model Number (-xx*)  
Liquid Line  
Suction Line  
L15 Line Set Model Line Set Length  
Catalog Number  
89J52  
L15-26-20  
L15-26-25  
L15-26-35  
L15-26-50  
L15-41-20  
L15-41-30  
L15-41-40  
L15-41-50  
L15-65-30  
L15-65-40  
L15-65-50  
20 feet (6.1 m)  
25 feet (9.1 m)  
35 feet (12.2 m)  
50 feet (15.2 m)  
20 feet (6.1 m)  
30 feet (9.1 m)  
40 feet (12.2 m)  
50 feet (15.2 m)  
30 feet (9.1 m)  
40 feet (12.2 m)  
50 feet (15.2 m)  
89J53  
13ACX-018-230  
13ACX-024-230  
3/8” (10 mm)  
5/8“ (16 mm)  
89J54  
89J55  
89J56  
13ACX-030-230  
13ACX-036-230  
13ACX-042-230  
89J57  
3/8” (10 mm)  
3/8” (10 mm)  
3/4” (19 mm)  
7/8” (22 mm)  
89J58  
89J59  
89J60  
13ACX-048-230  
13ACX-060-230  
89J61  
89J62  
* Applicable to all minor revision numbers unless otherwise specified.  
** Some applications may required a field-provided 1-1/8” to 7/8” adapter.  
Page 4  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
STEP 2 -- REFRIGERANT PIPING -- Removing Existing Indoor Metering Device  
TYPICAL EXISTING FIXED ORIFICE  
REMOVAL PROCEDURE  
(UNCASED COIL SHOWN)  
TYPICAL EXISTING EXPANSION VALVE REMOVAL  
PROCEDURE (UNCASED COIL SHOWN)  
OR  
1B  
1A  
STUB END  
TWO-PIECE PATCH PLATE  
(UNCASED COIL ONLY)  
LIQUID LINE  
ORIFICE  
HOUSING  
DISTRIBUTOR TUBES  
EXPANSION  
VALVE  
LIQUID LINE ORIFICE HOUSING  
DISTRIBUTOR  
TUBES  
®
TEFLON  
RING  
®
TEFLON RING  
FIXED ORIFICE  
BRASS NUT  
®
TEFLON  
RING  
SENSING  
LINE  
DISTRIBUTOR  
ASSEMBLY  
DISTRIBUTOR  
ASSEMBLY  
EQUALIZER  
LINE  
REMOVE AND DISCARD  
®
WHITE TEFLON SEAL  
(IF PRESENT)  
LIQUID LINE ASSEMBLY  
(INCLUDES STRAINER)  
LIQUID LINE  
ASSEMBLY WITH  
BRASS NUT  
A
B
On fully cased coils, remove the coil access and plumbing panels.  
Remove any shipping clamps from the liquid line and distributor as-  
sembly.  
MALE EQUALIZER  
LINE FITTING  
C
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.  
VAPOR  
LINE  
LIQUID  
LINE  
SENSING BULB  
D
E
Remove and discard fixed orifice, valve stem assembly (if present)  
®
A
B
On fully cased coils, remove the coil access and plumbing panels.  
and Teflon washer as illustrated above.  
Remove any shipping clamps from the liquid line and distributor  
assembly.  
Use a field-provided fitting to temporarily reconnect the liquid line to the  
indoor unit's liquid line orifice housing.  
C
Disconnect the equalizer line from the expansion valve equalizer  
line fitting on the vapor line.  
D
E
Remove the vapor line sensing bulb.  
CONNECT GAUGES AND EQUIPMENT FOR  
FLUSHING PROCEDURE  
Disconnect the liquid line from the expansion valve at the liquid line  
assembly.  
2
CYLINDER CONTAINING  
CLEAN HCFC-22 TO BE  
USED FOR FLUSHING  
(Positioned to deliver liquid  
refrigerant)  
GAUGE  
MANIFOLD  
F
Disconnect the expansion valve from the liquid line orifice housing.  
Take care not to twist or damage distributor tubes during this  
process.  
A
®
G
H
Remove and discard expansion valve and the two Teflon rings.  
LOW  
HIGH  
1
Use a field-provided fitting to temporarily reconnect the liquid line  
to the indoor unit's liquid line orifice housing.  
NEW  
OUTDOOR  
UNIT  
VAPOR LINE  
SERVICE VALVE  
FLUSHING LINE SET  
OPENED  
CLOSED  
The line set and indoor unit coil must be flushed with at least the same  
amountof clean refrigerant that previously charged the system. Check  
the charge in the flushing cylinder before proceeding.  
EXISTING  
INDOOR  
UNIT  
3
B
LIQUID LINE SERVICE  
VALVE  
A
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  
B
RECOVERY  
CYLINDER  
TANK  
RETURN  
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.  
C
INLET  
D
DISCHARGE  
RECOVERY MACHINE  
C
D
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.  
A
HCFC-22 cylinder with clean refrigerant (positioned to deliver liquid  
refrigerant)to the vapor service valve.  
B
C
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.  
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.  
D
Connect recovery tank to recovery machine per machine instructions.  
FIGURE 7  
Page 5  
13ACX SERIES  
Download from Www.Somanuals.com. All Manuals Search And Download.  
STEP 2 -- REFRIGERANT PIPING -- Brazing Procedures  
CAP AND CORE REMOVAL  
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.  
Remove service cap and core from  
both the suction / vapor and liquid line  
service ports.  
2
1
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  
ANGLE-TYPE SERVICE  
VALVE  
BALL-TYPE SERVICE  
VALVE  
REDUCER  
DO NOT CRIMP SERVICE VALVE  
CONNECTOR WHEN PIPE IS  
SMALLER THAN CONNECTION  
LINE SET SIZE IS SMALLER  
THAN CONNECTION  
REFRIGERANT LINE  
ATTACH THE MANIFOLD GAUGE SET FOR BRAZING LIQUID AND SUCTION / VAPOR LINE SERVICE  
VALVES  
3
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.  
A
B
C
Connect gauge set low pressure side to  
liquid line service valve (service port).  
USE REGULATOR TO FLOW  
NITROGEN AT 1 TO 2 PSIG.  
LOW  
HIGH  
Connect gauge set center port to bottle of  
nitrogenwith regulator.  
Remove core from valve in suction / vapor  
line service port to allow nitrogen to escape.  
ATTACH  
GAUGES  
B
SUCTION / VAPOR SERVICE PORT MUST BE  
OPEN TO ALLOW EXIT POINT FOR NITROGEN  
SUCTION /  
VAPOR LINE  
SERVICE  
VALVE  
C
VAPOR LINE  
OUTDOOR  
UNIT  
INDOOR  
UNIT  
NITROGEN  
LIQUID LINE SERVICE  
VALVE  
WHEN BRAZING LINE SET TO  
SERVICE VALVES, POINT FLAME  
AWAY FROM SERVICE VALVE.  
LIQUID LINE  
A
FIGURE 8  
CAUTION  
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.  
WARNING  
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.  
Wash hands with soap and water after handling brazing  
alloys and flux.  
Page 6  
Download from Www.Somanuals.com. All Manuals Search And Download.  
WRAP SERVICE VALVES  
To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use  
additionalwater-saturated cloths underneath the valve body to protect the base paint.  
4
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.  
5
6
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  
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.  
7
FIGURE 9  
Page 7  
13ACX SERIES  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
STEP 2 -- REFRIGERANT PIPING -- Installing Indoor Expansion Valve  
This outdoor unit is designed for use in systems that use either an fixed orifice (RFC) (included with outdoor unit), or  
expansion valve metering device (purchased separately) at the indoor coil. See the 13ACX Product Specifications bulletin  
(EHB) for approved expansion valve kit match ups. The expansion valve 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 expansion valve in a  
manner that will provide access for field servicing of the expansion valve. Refer to below illustration for reference during  
installation of expansion valve unit. After installation of the indoor coil metering device, proceed to Step 5.  
®
C
Install one of the provided Teflon rings around the  
stubbed end of the expansion valve and use refrigerant  
oil to lightly lubricate the connector threads and ex-  
INDOOR EXPANSION VALVE INSTALLATION  
®
posed surface of the Teflon ring.  
TWO-PIECE  
PATCH PLATE  
D
Attach the stubbed end of the expansion valve to the  
liquid line orifice housing. Finger tighten, then use an  
appropriately sized wrench to turn an additional 1/2  
turn clockwise as illustrated in the figure to the right, or  
tighten to 20 ft-lb.  
(Uncased Coil Shown)  
1/2 Turn  
(UNCASED  
STUB  
END  
LIQUID LINE  
ORIFICE  
HOUSING  
COIL ONLY)  
12  
EXPANSION  
VALVE  
1
11  
10  
2
DISTRIBUTOR  
TUBES  
9
3
®
®
E
F
Place the remaining Teflon washer around the other  
end of the expansion valve. Lightly lubricate connector  
TEFLON  
RING  
4
8
5
7
6
®
threads and expose surface of the Teflon ring with  
refrigerantoil.  
Attach the liquid line assembly to the expansion valve.  
Finger tighten, then 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.  
®
TEFLON  
RING  
SENSING  
LINE  
DISTRIBUTOR  
ASSEMBLY  
EQUALIZER  
LINE  
LIQUID LINE  
ASSEMBLY WITH  
BRASS NUT  
SENSING BULB INSTALLATION  
A
Attach the vapor line sensing bulb in the proper orienta-  
tion as illustrated below using the clamp and screws  
provided.  
MALE EQUALIZER LINE  
FITTING (SEE  
EQUALIZER LINE  
INSTALLATION FOR  
DETAILS)  
VAPOR  
LINE  
B
NOTE - Though it is preferred to have the sensing bulb  
installedon a horizontal run of the vapor line, installation  
on a vertical run of piping is acceptable if necessary.  
NOTE — Confirm proper thermal contact between vapor line  
and expansion bulb before insulating the sensing bulb.  
1/8 Turn  
Sensing bulb insulation is required if  
expansion valve is installed external to the  
coil casing. See sensing bulb installation for  
bulb positioning.  
12  
LIQUID LINE  
C
Connect the equalizer line from the expansion valve to  
the equalizer vapor port on the vapor line. Finger tighten  
the flare nut, then tighten an additional 1/8 turn (7 ft-lbs)  
as illustrated to the right.  
1
5
11  
10  
2
9
8
3
4
7
6
ON LINES SMALLER THAN  
7/8”, MOUNT SENSING  
BULB AT EITHER THE 3 OR  
9 O'CLOCK POSITION.  
VAPOR LINE  
EQUALIZER LINE INSTALLATION  
A
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.  
12  
BULB  
BULB  
B
Remove the field-provided fitting that temporarily reconnected  
the liquid line to the indoor unit's distributor assembly.  
FLARE SEAL CAP  
FLARE NUT  
VAPOR LINE  
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  
OR  
12  
MALE BRASS EQUALIZER  
LINE FITTING  
BULB  
BULB  
VAPOR LINE  
NOTE — NEVER MOUNT THE SENSING  
BULB ON BOTTOM OF LINE.  
FIGURE 10  
Page 8  
Download from Www.Somanuals.com. All Manuals Search And Download.  
STEP 3 -- LEAK TEST AND EVACUATION  
LEAK TEST  
HIGH  
MANIFOLD GAUGE SET  
LOW  
A
B
TO VAPOR  
SERVICE VALVE  
(ANGLE OR BALL  
TYPE)  
NITROGEN  
OUTDOOR UNIT  
HFC-410A  
CONNECT GAUGE SET  
1
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.  
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:  
2
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).  
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) refrigerant 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.  
Connect a cylinder of nitrogen with a pressure regulating valve to the center port of the manifold gauge  
set.  
B
C
D
E
F
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.  
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.  
After leak testing, disconnect gauges from service ports.  
FIGURE 11  
Page 9  
13ACX SERIES  
Download from Www.Somanuals.com. All Manuals Search And Download.  
STEP 3 -- LEAK TEST AND EVACUATION (CONTINUED)  
EVACUATION  
HIGH  
LOW  
CONNECT GAUGE SET  
NOTE — Remove cores from service valves (if not already done).  
3
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  
MANIFOLD  
GAUGE SET  
1/4 SAE TEE WITH SWIVEL  
COUPLER  
Connect available micron gauge connector  
on the 1/4 SAE in-line tee.  
A
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.  
500  
TO VAPOR  
SERVICE VALVE  
MICRON  
GAUGE  
C
NITROGEN  
OUTDOOR  
UNIT  
TO LIQUID LINE  
SERVICE VALVE  
HFC-410A  
B
VACUUM PUMP  
RECOMMEND  
MINIMUM 3/8” HOSE  
D
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).  
4
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:  
S
S
S
S
S
S
S
Close manifold gauge valves.  
WARNING !  
Possible equipment damage.  
Close valve on vacuum pump.  
Turn off vacuum pump.  
Avoid deep vacuum operation. Do not use  
a
Disconnect manifold gauge center port hose from vacuum pump.  
compressors to evacuate  
system.  
Attach manifold center port hose to a nitrogen cylinder with pressure  
regulatorset to 150 psig (1034 kPa) and purge the hose.  
Extremely low vacuum can cause internal  
arcing and compressor failure. Damage  
caused by deep vacuum operation will  
void warranty.  
Open manifold gauge valves to break the vacuum in the line set and  
indoor unit.  
Close manifold gauge valves.  
D
E
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.  
Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the  
absolutepressure 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:  
S
S
S
S
Close manifold gauge valves.  
Shut off HFC-410A cylinder.  
1/6 TURN  
12  
1
Reinstall service valve cores by removing manifold hose from service valve. Quickly  
install cores with core tool while maintaining a positive system pressure.  
11  
7
2
10  
9
8
3
Replace stem caps and finger tighten them, then tighten an additional one-sixth (1/6)  
of a turn as illustrated.  
4
5
6
FIGURE 12  
Page 10  
Download from Www.Somanuals.com. All Manuals Search And Download.  
STEP 4 -- 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  
IMPORTANT !  
must conform with current local codes and the current  
Canadian Electrical Code (CEC).  
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.  
Refer to the furnace or air handler installation instructions for  
additional wiring application diagrams and refer to unit  
nameplate for minimum circuit ampacity and maximum  
overcurrent protection size.  
CAUTION  
Electrostatic discharge can affect  
electronic components. Take care during  
unit installation and service to protect the  
24VAC TRANSFORMER  
Use the transformer provided with the furnace or air handler  
for low‐voltage control power (24VAC - 40 VA minimum)  
unit's electroniccontrols.Precautionswill  
help to avoid control exposure to  
electrostatic dischargebyputtingtheunit,  
the controland the technicianat the same  
electrostatic potential. Touchhandand all  
tools on an unpainted unit surface before  
performing any service procedure to  
neutralize electrostatic charge.  
WARNING  
ELECTROSTATIC  
DISCHARGE  
(ESD)  
Precautions and  
Procedures  
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.  
SIZE CIRCUIT AND INSTALL SERVICE  
DISCONNECT SWITCH  
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.  
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.  
MAIN FUSE BOX/  
BREAKER PANEL  
THERMOSTAT  
SERVICE  
DISCONNECT  
SWITCH  
5 FEET  
(1.5M)  
NOTE —Unitsareapprovedforuseonlywithcopper  
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 13  
Page 11  
13ACX SERIES  
Download from Www.Somanuals.com. All Manuals Search And Download.  
STEP 4 -- ELECTRICAL (CONTINUED) -- High Voltage and Field Control Wiring  
The following illustration provide an example of control wiring connections when using standard thermostat.  
ROUTING HIGH VOLTAGE, GROUND AND CONTROL WIRING  
FIELD CONTROL WIRING  
HIGH VOLTAGE / GROUND WIRES  
THERMOSTAT  
INDOOR UNIT  
Any excess high voltage field wiring should be  
trimmed and secured away from any low voltage field  
wiring. To facilitate a conduit, a cutout is located in the  
bottom of the control panel. Connect conduit to the  
control panel using a proper conduit fitting.  
POWER  
R
R
HEAT  
NOTE — Wire tie provides low voltage control wire strain  
relief and maintains separation of field-installed low and  
high voltage circuits.  
W1  
Y
W
Y
YELLOW  
OUTDOOR UNIT  
Y1  
COOLING  
NOTE — For proper voltages, select thermostat wire  
(control wires) gauge per table above.  
NOTE — Do not bundle any excess 24VAC control  
wires inside control panel.  
INDOOR BLOWER  
COMMON  
G
C
G
C
BLACK  
Install low voltage wiring from outdoor to indoor unit  
and from thermostat to indoor unit as illustrated.  
C
A
Run 24VAC control wires through hole with grommet  
and secure with provided wire tie.  
WIRE RUN LENGTH  
AWG# INSULATION TYPE  
B
Make 24VAC thermostat wire connections. Locate  
the two wires from the contactor and make  
connection using field-provided wire nuts:  
LESS THAN 100' (30 METERS) 18  
MORE THAN 100' (30 METERS) 16  
TEMPERATURE RATING  
35ºC MINIMUM.  
S
S
Yellow to Y1  
Black to C (common)  
FIGURE 14  
8. Recheck voltage while the unit is running. Power must  
be within range shown on the unit nameplate.  
STEP 5 -- UNIT START-UP  
9. Check system for sufficient refrigerate using the  
procedures outlined in under System Refrigerant.  
IMPORTANT  
OPERATING MANIFOLD GAUGE SET AND SERVICE  
VALVES  
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.  
The liquid and vapor line service valves are used for  
removing refrigerant, flushing, leak testing, evacuating,  
checking charge and charging.  
1. Rotate fan to check for binding.  
2. Inspect all factory- and field-installed wiring for loose  
connections.  
Each valve is equipped with a service port which has a  
on how to access and operating both angle and ball service  
valves.  
3. After evacuation is complete, open the liquid line and  
suction line service valve stems to release the  
refrigerant charge (contained in outdoor unit) into the  
system.  
Torque Requirements  
When servicing or repairing heating, ventilating, and air  
conditioning components, ensure the fasteners are  
appropriately tightened. Table 3 lists torque values for  
fasteners.  
4. Replace the stem caps and tighten to the value listed in  
table 3.  
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.  
IMPORTANT  
To prevent stripping of the various caps used, the  
appropriately sized wrench should be used and fitted  
snugly over the cap before tightening.  
6. Connect manifold gauge set for testing and charging  
using figure NO TAG as a guideline.  
7. Set the thermostat for a cooling demand. Turn on power When servicing or repairing HVAC components, ensure the  
fasteners are appropriately tightened. Table 3 provides  
torque values for fasteners.  
to the indoor indoor unit and close the outdoor unit  
disconnect switch to start the unit.  
Page 12  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE 3. TORQUE REQUIREMENTS  
Recommended Torque  
gauge set that features low loss anti-blow back fittings.  
Parts  
Manifold gauge set used with HFC-410A refrigerant  
systems must be capable of handling the higher system  
operating pressures. The gauges should be rated for use  
with pressures of 0 - 800 psig on the high side and a low side  
of 30” vacuum to 250 psig with dampened speed to 500 psi.  
Gauge hoses must be rated for use at up to 800 psig of  
pressure with a 4000 psig burst rating.  
Service valve cap  
Sheet metal screws  
Machine screws #10  
Compressor bolts  
Gauge port seal cap  
8 ft.- lb.  
11 NM  
2 NM  
16 in.- lb.  
28 in.- lb.  
90 in.- lb.  
8 ft.- lb.  
3 NM  
10 NM  
11 NM  
Using Manifold Gauge Set  
When checking the system charge, only use a manifold  
Operating Angle Type Service Valve:  
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 vapor line valve sizes) to back  
the stem out counterclockwise as far as it will go.  
SERVICE PORT CAP  
SERVICE PORT CORE  
(VALVE STEM SHOWN  
CLOSED) INSERT HEX  
WRENCH HERE  
TO INDOOR  
UNIT  
(VALVE STEM SHOWN OPEN)  
INSERT HEX WRENCH HERE  
SERVICE PORT  
CORE  
STEM CAP  
TO OUTDOOR UNIT  
ANGLE-TYPE SERVICE VALVE  
(FRONT-SEATED CLOSED)  
ANGLE-TYPE SERVICE VALVE  
(BACK-SEATED OPENED)  
When service valve is OPEN, the service port is  
open to line set, indoor and outdoor unit.  
When service valve is CLOSED, the service port is open  
to the line set and indoor unit.  
To Access Service Port:  
Operating Ball Type Service Valve:  
A service port cap protects the service port core from contamination and  
serves as the primary leak seal.  
1. Remove stem cap with an appropriately sized wrench.  
2. Use an appropriately sized wrenched to open. To open valve,  
rotate stem counterclockwise 90°. To close rotate stem  
clockwise 90°.  
1. Remove service port cap with an appropriately sized wrench.  
2. Connect gauge set to service port.  
3. When testing is completed, replace service port cap and tighten as  
follows:  
TO INDOOR UNIT  
1/6 TURN  
S
S
With torque wrench: Finger tighten and  
torque cap per table 3.  
12  
6
1
5
11  
10  
Without torque wrench: Finger tighten and  
use an appropriately sized wrench to turn  
an additional 1/6 turn clockwise.  
2
TO OPEN ROTATE STEM  
COUNTERCLOCKWISE 90°.  
9
3
BALL (SHOWN  
CLOSED)  
4
8
7
VALVE  
TO CLOSE ROTATE STEM  
STEM  
Reinstall Stem Cap:  
CLOCKWISE 90°.  
Stem cap protects the valve stem from damage and serves as the  
primary seal. Replace the stem cap and tighten as follows:  
SERVICE PORT  
1/12 TURN  
SERVICE PORT  
CORE  
S
S
With Torque Wrench: Finger tighten and  
then torque cap per table 3.  
12  
6
1
5
11  
10  
SERVICE PORT  
CAP  
Without Torque Wrench: Finger tight-  
en and use an appropriately sized  
wrench to turn an additional 1/12 turn  
clockwise.  
2
9
3
STEM CAP  
4
TO OUTDOOR  
UNIT  
8
7
NOTE — A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.  
FIGURE 15  
Page 13  
13ACX SERIES  
Download from Www.Somanuals.com. All Manuals Search And Download.  
 
CHECKING AND ADDING SYSTEM  
REFRIGERANT  
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, soak-  
ers, waste water, etc.) will corrode the surface of steel  
and aluminum parts, diminish performance and af-  
fect longevity of the unit.  
The 13ACX 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 located on  
the unit access panel. Detailed information is provided in the  
13ACX Installation and Service Procedures manual  
(Corp0625-L5), which is available on DaveNet.  
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.  
Homeowners Information  
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.  
CAUTION  
Before attempting to perform any service or mainte-  
nance, turn the electrical power to unit OFF at discon-  
nect switch.  
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.  
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 service your  
outdoor unit. The following maintenance may be performed  
by the homeowner.  
2. Disposable filters should be replaced with a filter of the  
same type and size.  
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. (This would also apply to an auxiliary  
drain, if installed.)  
Outdoor Coil  
The outdoor unit must be properly maintained to ensure its  
proper operation.  
Thermostat Operation  
®
See the ComfortSense 7000 thermostat homeowner  
manual for instructions on how to operate your thermostat.  
S Please contact your dealer to schedule proper inspection  
and maintenance for your equipment.  
Preservice Check  
If your system fails to operate, check the following before  
calling for service:  
S Make sure no obstructions restrict airflow to the outdoor  
unit.  
S Grass clippings, leaves, or shrubs crowding the unit can  
S
S
S
S
S
S
Verify room thermostat settings are correct.  
Verify that all electrical disconnect switches are ON.  
Check for any blown fuses or tripped circuit breakers.  
Verify unit access panels are in place.  
cause the unit to work harder and use more energy.  
S Keep shrubbery trimmed away from the unit and  
periodically check for debris which collects around the  
unit.  
Verify air filter is clean.  
S Keep snow level below the louvered panels to ensure  
If service is needed, locate and write down the unit  
model number and have it handy before calling.  
proper performance.  
Page 14  
Download from Www.Somanuals.com. All Manuals Search And Download.  
13ACX Start-Up and Performance Checklist  
Customer  
Address  
Serial  
Indoor Unit Model  
Outdoor Unit Model  
Notes:  
Serial  
START UP CHECKS  
Refrigerant Type:  
Rated Load Amps:  
Actual Amps  
Actual Amps:  
Rated Volts  
Actual Volts  
Condenser Fan Full Load Amps  
COOLING MODE  
Suction Pressure:  
Liquid Pressure:  
Ambient Temperature:  
Supply Air 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
A
A
B
B
B
=
SUBCOOLING  
Saturated Condensing Temperature (A)  
minus Liquid Line Temperature (B)  
Approach:  
=
APPROACH  
Liquid Line Temperature (A)  
minus Outdoor Air Temperature (B)  
Indoor Coil Temperature Drop (18 to 22°F)  
= COIL TEMP DROP  
Return Air Temperature (A)  
minus Supply Air Temperature (B)  
Page 15  
13ACX SERIES  
Download from Www.Somanuals.com. All Manuals Search And Download.  

Lennox International Inc Furnace EL280UH User Manual
LevelOne Switch GSW 1674T User Manual
LG Electronics Microwave Oven MC8088HL User Manual
Lochinvar Water Heater 151 200 User Manual
Lux Products Thermostat CH200SA User Manual
Magnat Audio Speaker 630A User Manual
Makita Saw LS1013F User Manual
Masterbuilt Fire Pit MDCL User Manual
McCulloch Lawn Mower 532 40 80 72 User Manual
Melissa Hot Beverage Maker 245 029 041 User Manual