Lennox Merit 13ACD-018, Merit 13ACD-024, Merit 13ACD-030, Merit 13ACD-036, Merit 13ACD-042 Installation Instructions Manual

INSTALLATION

,1,_,2008LennoxtndustriesInc,

®

Dallas,Texas,USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

WARNING

INSTRUCTIONS

Merit® Series13ACD Units

AIR CONDITIONER UNITS

505,366M
01I08

Supersedes 11/07

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

_puTeCh ical

n

blications

Litho U.S.A.

CAUTION

IMPORTANT

01/08

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

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 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

Page 1

505,366M

IIIIIIIIIIIIIIIIIIIIIIHIIIIIIIIIIIHlllllllll

A A

OPTIONAL UNIT STAND-OFF KIT

OUTDOOR COIL FAN tDischarge Air

COMPRESSOR_

SUCTION ANDLIQUIDLINE

CONNECTIONS

(4) (FIELDqNSTALLED)

SIDE VIEW

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

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

Service valve cap 8 ft.- lb.
Sheet metal screws 16 in.- lb.

Machine screws #10 28 in.- lb.

I

Compressor bolts 90 in.- lb.
Gauge port seal cap 8 ft.- lb.

USING MANIFOLD GAUGE SETS

Recommended Torque

11 NM

2NM
3NM

10 NM
11 NM

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

These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities

who have jurisdiction before installation.

505366M 01/08

The liquid and suction line service valves are typically used
for removing refrigerant, flushing, leak testing, evacuating,

checking charge and charging,

Page 2

OUTDOOR UNIT (Uncased Coil Shown)

LOW HIGH

PRESSURE PRESSURE

LIQUID LINE SUCTION LINE

COMPRESSOR-- I[ -" ..._

Figure 1. Typical Manifold Gauge Connection Setup

Each valve is equipped with a service port which has a

factory-installed valve stem.

t/6 TURN

1/12 TURN

Figure 2. Cap Tightening Distances

,A IMPORTANT

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 - ORIFICE

COIL

• TXV OR FIXED

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

CLOSED) INSERT HEX
WRENCH HERE

SERVICE PORT

CLOSED TO BOTH

INDOOR AND

OUTDOOR UNITS

VALVE STEM

FRONT-SEATED

TOINDOOR

UNIT

TO OUTDOOR UNIT

Figure 3. Angle-Type Service Valve

(Font-Seated Closed)

Page 3

13ACD SERIES

SERVICEPORT

SERVICEPORT

OPENTOBOTH

INDOORAND

OUTDOORUNITS

TOINDOOR

UNIT

STEMCAP

TOOUTDOORUNIT

Figure 4. Angle-Type Service Valve

(Back-Seated Opened)

Operating Bali-Type Service Valve

To Access Bali-Type Service Port:

SERVICEPORT

(VALVESTEMSHOWNOPEN)

INSERTHEXWRENCHHERE

To Open and Close Bali-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,

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 ° . BALL(SHOWN

TO CLOSE ROTATE STEM
CLOCKWISE 90 ° .

CORE

SERVlCEPORTCAP

TO INDOOR UNIT

CLOSED)

STEM CAP

VALVE
STEM

Figure 5. Bali-Type Service Valve

1. Remove service port cap with an appropriately sized
wrench.

2. Connect gauge to the service port,

3. When testing iscompleted, 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,

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

c p. COVERY

/

OUTDOOR UNIT

Figure 6. Typical Refrigerant Recovery (Method 1)

505366M 01/08

Page 4

METHOD2:
Usethismethodiftheexistingoutdoorunitis equipped

with manualshut-offvalves,and planon usingnew

HCFC-22refrigeranttoflushthesystem,
IMPORTANT:Somesystemconfigurationsmaycontain

higherthannormalrefrigerantchargeduetoeitherlarge
internalcoilvolumes,and/orlonglinesets,Thefollowing

conditionsmaycausethecompressortostopfunctioning:
Thefollowingdevicescouldpreventfull 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

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 _ _I

FRO W

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.

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,

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

Field

Model

-018

-024 (10mm) (19mm)

-030

-036

-042 (10mm) (22mm)

-048

-060 (10mm) (29mm)

Connections

Liquid Suction
Line Line

3/8 in. 3/4 in

3/8 in. 7/8 in

3/8 in. 1-1/8 in.

Recommended Line Set

Liquid Suction L15

Line Line Line Sets

3/8 in. 3/4 in L15-41

(10 (19 ram) 15 ft, - 50 ft.
mm) (4.6 m - 15 m)

3/8 in. 7/8 in L15-65

(10 (22 mm) 15 ft, - 50 ft.
mm) (4.6 m- 15 m)

3/8 in, 1-1/8 in. Field

(10 (29 mm) Fabricated
mm)

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 RFCl-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

LINESETISOLATION
Thisreferenceillustratesprocedures,whichensureproper

refrigerantlinesetisolation:
Linesetfor heatpumpapplicationscannotbeinstalled

underground.For more informationsee 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.

• 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 WIRE TIE

MATERIAL OR ANCHORED HEAVY NYLON (AROUND
WIRE TIES. SUCTION LINE

STRAPPING MATERIAL ONLY)

(AROUND SUCTION

LINE ONLY)

TAPE OR

8 FEET

WIRE TIE

IMPORTANT - REFRIGERANT LINES

OUTSIDE WALL SUCTION LINE

NOTE - Similar installation

practices should be used if

line set is to be installed on
exterior of outside wall.

SUCTION LINE WRAPPED

WITH ARMAFLEX

IMPORTANT!

MUST NOT CONTACT WALL.

LIQUID LINE

SLEEVE

WIRE TIE

WOOD BLOCK

WIRE TIE

STRAP

METAL

SLEEVE

TAPE OR

WIRE TIE

FLOOR JOIST OR

ROOF RAFTER -- ,b _

STRAP THE SUCTION LINE TO
THE JOIST OR RAFTER AT 8 FEET

INTERVALS THEN STRAP THE
LIQUID LINE TO THE SUCTION
LINE.

Figure 10. Refrigerant Line Set: Installing Horizontal

Runs

ANCHORED HEAVY

NYLON WIRE TIE

\

WAU /
STU[ /

/ /

METAL SLEEVE

! _ STRAPUQU_DUNE

TO SUCTION LINE

\

X LIQUID LINE

SUCTION LINE - WRAPPED IN
ARMAFLEX

CONTACT

STRUCTURE.

PVC _ CAULK

PIPE

FIBERGLASS

INSULATION

Figure 11. Refrigerant Line Set: Installing Vertical

Runs (New Construction Shown)

AUTOMOTIVE

MUFFLER-TYPE HANGER

WALL
STUD

STRAP LIQUID LINE TO
SUCTION LINE

UIDLINE

SUCTIONLINE-WRAPPEDIN
ARMAFLEX

METAL SLEEVE

Figure 12. Refrigerant Line Set: Transition from Vertical to Horizontal

Page 7

13ACD SERIES

1

CUT AND DEBUR

INDOOR UNIT

REMOVE CAP AND CORE FROM

BOTH LIQUID AND SUCTION

SERVICE PORTS

SERVICE PORT MUST BE

OPEN TO ALLOW EXIT

POINT FOR NITROGEN SERVICE

/. SUCTION LINE _ /VALVE

OUTDOOR

UNIT

LIQUtD LINE SERVICE/_

,4-,,

INSTALL CORE ONLY FOR

BOTH SERVICE PORTS AFTER

THEY HAVE COOLED.

Figure 13. 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,

A, WARNING I

VALVE

RAP /_

SER

VALVE _

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

WARNING

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.

505366M 01/08

i minimum silver alloy for copper-to-copper brazing or 45percent 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,

,A IMPORTANT

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.

Page 8

TYPICAL TXV REMOVAL PROCEDURE

RemovetheexistingHCFC-22refrigerantflowcontrol
orificeorthermalexpansionvalvefromtheindoorcoil.

REPLACEMENTPARTS
If replacementpartsarenecessaryfortheindoorunit,

orderkit69J46.Thekitincludes:

• 10-- Brassnutsforliquidlineassemblies

• 20-- Teflonrings

• 10-- Liquidlineorificehousings

• 10-- Liquidlineassemblies

LIQUID LINE ORIFICE HOUSINGS (10)

_ ..._iE FL ON _%GS(s20 )NUT _

_ TRAIN ERCOPPER

LIQUID LINE

ASSEMBLY

LIQUID LINE ASSEMBLIES

(INCLUDES STRAINER) (10)

i

Figure 14. 69J46 Kit Components

TYPICAL FIXED ORIFICE REMOVAL PROCEDURE

DISTRIBUTOR TUBES

LIQUID LINE ORIFICE HOUSING

TEFLON RING REMOVE AND DISCARD

FIXED VALVE STEM ASSEMBLY

". i s

DISTRIBUTOR " -

ASSEMBLY

VALVE STEM

VALVE STEM CAP (Uncased Coil Shown)

(IF PRESENT)

f

LIQUID LINE ASSEMBLY

(INCLUDES STRAINER)

PISTON

/ RETAINER

TUBE

BRASS NUT

TWO PIECE

PATCH PLATE

JNCASED COIL LIQUID LINE STUB END

ONLY) \ ORIFICE HOUSING

)ISTRIBUTOR TXV

TUBES

RING

MALE EQUALIZER LINE /

FITTING / SUCTION

SENSING BULB 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,

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,

(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.

1/2 TURN

Figure 17. Tightening Distance

Page 9

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,

t, I / L,OU,DL,NEOR,F,CEHOUS,NG

_%,_\%. ]_/ FIXED

_L_'_ I ORIFICE TEFLON

J_'___ _((((_ / WASHER

/ I-I Oj-- L'NE

(Uncased Coil Shown)

Figure 18. Typical Fixed Orifice Installation

See the 13ACD Engineering Handbook forapproved 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 Number Part Number Drill Size

018 10W95 100484-07 0.055
024 98M 12 100484-12 0.062
030 11W00 100484-16 0.067
036 98M78 100484-24 0.076
042 10W86 100484-28 0.080

048 98M 14 100484-36 0.089
060 98M 15 100484-45 0.099

Use the Lennox catalog number to order a new or replacement fixed

orifice kit.

The kit includes:

• 1 -- Fixed orifice

• 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)

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, Fingertighten 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_8

Page 10

TWOPIECE (UncasedCoilShown)

PATCH PLATE

tNCASED COIL

ONLY) LIQUID LINE

DISTRIBUTOR TXV

TUBES. -

HOUSING

..._ORIFICE STUB END

RING

FLARE SEAL

CAP

,_ [__FLARE NUT

I X COPPERE OR --FLARE SEAL

I

-- MALE BRASS EQUALIZER

BONNET

MALE EQUALIZER LINE

FITTING (SEE SUCTION

FIGURE 22 FOR LINE

FURTHER DETAILS)

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, 718", mount sensing bulb

/

Bulb

\

On lines smaller than
at either the 3 or 9 o'clock

position,

LIQUID

LINE

_ LINE FITTING

SUCTION LINE

Figure 22. Copper Flare Seal Bonnet Removal

7, Connect the equalizer line from the TXV to the

equalizer suction port on the suction line. Finger
tighten the flare nut plus 1/8 turn (7 ft-lbs) as illustrated
in figure 17,

NOTE - To prevent any possibility of water damage,

properly insulate all parts of the TXV assembly that may

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 Part

-018, -024, -030 and -036 26K34 LB-85663J

-042, -048 and -060 26K35 LB-85663k
Use the Lennox catalog number to order a TXV kit.

Number Number

The above reference kits include:

1 -- TXV

2 -- Teflon rings

1 -- 1 1/4" wide copper mounting strap for sensing bulb

2 --#10 hex head bolts and nuts for securing sensing bulb

On 7/8" and larger lines,

Suction Line

_2_"Y A,.\\",_ t

mount sensing bulb at

either the 4 or 8 o'clock

position, never mount on

mof line.

(Bulb .

NO TE - 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

AND NUTS (2)

O_TEFLON

RINGS (2) _ _//7

J

STRAP (1) _

Figure 23. TXV Kit Components

Xk IMPORTANT

Page 11

13ACD SERIES

WARNING

WARNING I

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 fiquid 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.

I

14. After leak testing disconnect gauges from service
ports.

WARNING

,& IMPORTANT

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_8

Page 12

DESCRIPTION

A4 i]ONTROL-TIMED OFF
_I i]OMPRESSOR

54 i_OTOR-OUTDOOR FAN

_12 i]APACITOR-DUAL
HRI i4EATER-COMPRESSOR

KI.-liCONTACTOR-COMPRESSOR

$4 iSWlTCH-HIGH PRESSURE

587 i_WITCH-LOW PRESS.COMP I

./_ FOR USE WITH COPPER

CONDUCTORS ONLY. REFER
TO UNIT RATING PLATE
FOR MINIMUM CIRCUIT

AMPACITY AND MAXIMUM
OVERCURRENT PROTECTION
SIZE,

Z_ JUMPER IS USED WHEN TOC IS NOT USED

_LINE VOLTAGE FIELD INSTALLED
I III CLASS II VOLTAGE FIELD INSTALLED

MP N NT

INDICATES OPTIONAL
COMPONENTS

WARNING-

ELECTRIC SHOCK HAZARD, CAN CAUSE

INJURY OR DEATH, UNIT MUST BE

GROUNDED IN ACCORDANCE WITH
NATIONAL AND LOCAL CODES.

OUTDOOR

PURPLE

CLACK

ORANGE

COMPRESSOR

CRANKCASE HEATER

208-23016011

L2.,_

_-_EOUIPMENT

= GROUND

HRI

r_

RED

DUAL
CAPACITOR

CONTACTOR

OROUND

LUG

KI-I YELLOWl I IBt HIBF 587 OR SZ4

o-oiRE°I i SW,TcHPRESSORE

$ (I ]ORANGEI .

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

A4

TIMED OFF

CONTROL

I I I

-L4_

I I

TO 24 VAC POWER

SOURCE

20 VA MINIMUN
NEC CLASS 2

C YI

TO 24 VAC

P_ER SOURCE

20 VA MINIMUN
NEC CLASS 2

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,

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.

I WARNING

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

LOW VOLTAGE

FIELD WIRING

-- FACTORY
WIRING

GROMMET

THERMOSTAT

@
@

Q COOLING

Q BLOWER

POWER

HEAT

INDOOR

COMMON

INDOOR UNIT

@I OUTDOOR

QI

d

UNIT

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 Color-coded with a minimum
More than 100 feet (30 m) 16 temperature rating of 35°C.

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-8-325 f or

equivalent)

Figure 26. Typical Field Low Voltage Wiring

A IMPORTANT

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 #quid 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

Delta-T

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

80

74

21 21 21 20 19 19 18 17 16 16 15 14 13 12
20 20 19 18 17 17 161L_5._15 14 13 12 11 10

19 19 18 18 17 17 16 15 15 14 13 12 11 10

I Wet-bulb °F

57 58 59 60 61 62 63 64 65 66 67 68 69 70 I

iNDOOR t WET

COIL BULB

Figure 27. Checking Indoor Airflow over Evaporator Coil using Delta-T Chart

(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 70-80°F (21-26°C)

• Manifold gauge set connected to unit

• Thermometers:

to measure outdoor ambient temperature
to measure liquid line temperature
to measure suction line temperature

1. Determine the desired DT--Measure 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 coil--Measure the coil's dry bulb
entering and leaving air temperatures (A and C). Temperature Drop

Formula: (TDrop) = A minus C.

I

3. Determine if fan needs adjustment--If the difference between the

I

measured TDropand the desired DT (TDrop-DT} is within +3°, no ad-

justment is needed. See examples: Assume DT = 15 and A temp. =

72°, these C temperatures would necessitate stated actions:
C° TDrop- DT = °F ACTION

53° 19 - 15 = 4 Increase the airflow

DRY

BULB

58° 14 - 15 = -1 (within +3 ° range) no change
62° 10 - 15 = -5 Decrease the airflow

4. Adjust the fan speed--See 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 +3 °.

APPROACH OR

SUBCOOLING

WEIGH-IN

SUPERHEAT

Figure 28. Determining Charge Method

WE G

Refrigerant Charge per Line Set Length

Liquid Line Ounces per 5 feet (g per 1.5 m)

Set Diameter adjust from 15 feet (4.6 m) line set*

3/8" (9.5 mm) 3 ounce per 5' (85 g per 1.5 m)

NOTE - *If line length is greater than !5 ft. (4.6 m), add this
amount. If line length is less than 15 ft. (4.6 m), subtract this

amount.

Figure 29. HCFC-22 Weigh In TXV Method

BELOW

LENNOX

Page 15

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

ABOVE

If refrigerant added or

removed, verify charge using
the approach method

BLOCK OUTDOOR COIL: [sometimes necessary with
lower temperatures] Use cardboard or plastic sheet to

restrict the airflow through the outdoor coil to achieve

If value is greater than shown,
remove refrigerant; if less than

shown, add refrigerant

SC ° (Subcooling) Values (F:+/-1.0 ° [C: +/-0.6°])

Any 7 (3.8) 12 (6.7) 9 (5) 10 (5.6) 14 (8) 10 (5.6) 13 (7.2)
°F (°C)* -018 -024 -030 -036 -042 -048 -060
*Temperature of air entering outdoor coil

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.

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 70-80°F (21-26°C)

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:

SAT o=

11. Subtract to determine subcooling (SC°):
SATo . LIQ o = SCo

12. Compare results with table to the left.

Figure 30. HCFC-22 Subcooling TXV Charge

ABOVE

H

........[XV

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.

APP ° (Approach) Values(F:+/-1.0 ° [C: +/-0.6°])

°F (°C)* -018 -024 -030 -036 -042 -048 -060
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

If refrigerant added or removed,
retest to confirm that unit is

properly charged

Figure 31. HCFC-22 Approach TXV Charge

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 70-80°F (21-26°C).

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:

AMB°=

9. Record line temperature:

LIQo=

10. Subtract to determine approach (APP°):

LIQo . AMB o = App o

11. Compare results with table to the left.

505366M 01/08

Page 16

f ER I A ....RFC

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.

ABOVE

SH ° (Superheat) Values (+/-5°F)

Wet Bulb air enterinc indoor coil

°F* 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 12 14 17 20 23 27 30 33 36 38 40 42 44

60 7 10 12 15 18 21 24 27 30 33 35 38 40 43
65 6 10 13 16 19 21 24 27 30 33 36 38 41

70 7 10 13 16 19 21 24 27 30 33 36 39
75 6 9 12 15 18 21 24 28 31 34 37
80 5 8 12 15 18 21 25 28 31 35
85 8 11 15 19 22 26 30 33

90 5 9 13 16 20 24 27 31
95 6 10 14 18 22 25 29

100 8 12 16 21 24 28
105 5 9 13 17 22 26

110 6 11 15 20 25
115 8 14 18 24

* Dry-bulb temperature (°F) of entering outdoor ambient air.

1. Confirm proper airflow across coil using figure27.

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 70-80°F (21-26°C)

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:
SAT o=

9. Record suction line temperature:

VAP o=

10. Subtract to determine superheat (SH°):
VAP o. SAT o = SH o

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 ovemharged.

Superheat is taken at suction line service port.
Suction line superheat must never be less than 5°t:
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)

A IMPORTANT

13ACD -018 -024 -030 -036 -042 -048 -060

°F (°C)* Liquid/Suction Liquid/Suction Liquid/Suction Liquid / Suction Liquid/Suction Liquid/Suction Liquid / Suction

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

INSTALLING SERVICE VALVE CAPS

Disconnect gauge set and re-install both the liquid and
suction service valve caps.

I WARNING

OUTDOOR UNIT

SERVICE VALVES _ /

INSTALL CAPS

Figure 33. Installing Service Valve Caps

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.

505366M 01/08

WARNING

Page 18

At the beginningof eachcoolingseason,thesystem

shouldbecheckedasfollows:
OUTDOORUNIT

1, Cleanandinspectoutdoorcoil(maybeflushedwitha

waterhose).Ensurepowerisoffbeforecleaning,

2, Outdoorunitfanmotorispre-lubricatedandsealed.

Nofurtherlubricationisneeded.

3,Visuallyinspectallconnectinglines,jointsandcoilsfor

evidenceofoilleaks.

4, Checkallwiringforlooseconnections,

5, Checkforcorrectvoltageatunit(unitoperating),

6, Checkampdrawonoutdoorfanmotor,

UNITNAMEPLATE: ACTUAL:

7, Inspectdrainholesin coil compartmentbaseand

cleanifnecessary,

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

IMPORTANT

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

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:

kWARNING

PUSH Pli'

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

Page19

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

System Switch Set the system switch for heating, cooling or auto

Temperature The temperature indicator displays the actual room

Indicator temperature.

Set the lever or dial to the desired temperature
setpoints for both heating and cooling. Avoid
frequent temperature adjustment; turning the unit
off--then back on--before pressures can equalize
will put unusual stress on the unit's compressor.

In AUTO or INT (intermittent) mode, the blower
operates only when the thermostat calls for heating
or cooling. This mode is generally preferred when
humidity control is a priority. The ON or CONT
mode provides continuous indoor blower
operation, regardless of whether the compressor
or furnace is operating. This mode is required when

constant air circulation or filtering is desired.

operation. The auto mode allows the system to
automaticallyswitch from heating mode to cooling
mode to maintain predetermined comfort settings.

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.

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

)ublish.

Optional Accessory

Compressor Start Kit
Loss of Charge Kit

Sound Cover
Replacement Liquid Line Drier

Plastic Feet Kit
Crankcase Heater - 40W

High Pressure Kit

Catalog Number

10J42

94J47
69J03

12L71

94J45
93M04

94J46

Part Number

LB-31200BM
LB-87620A

69J0301

12L7101

LB-87156A

100499-01

LB-87620A

Job Name
Job Location
Installer

Unit Model No,

Serial No.
Nameplate Voltage
Rated Load Ampacity

Compressor

Maximum Fuse or Circuit Breaker
Electrical Connections Tight?

Indoor Blower RPM
Discharge Pressure __

S.P. Drop Over Indoor (Dry)

Suction Pressure

Indoor Filter clean?

Service Valves: --- Fully Opened? _ Caps Tight?
Voltage With Compressor Operating

Job no. Date

City State
City State

Service Technician

Outdoor Fan

Supply Voltage (Unit Off)
Outdoor Coil Entering Air Temp.

Refrigerant Charge Checked?

J Thermostat

Calibrated? _ Properly Set? _ Level?

505366M 01/08

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