INSTALLATION
2011 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
INSTRUCTIONS
Merit® Series 14ACX Units
CONDENSING UNITS
506645−01
07/11
Supersedes 11/10
TABLE OF CONTENTS
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . . . .
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Unit Parts Arrangement 3. . . . . . . . . . . . . . . . . . .
Model Number Identification 3. . . . . . . . . . . . . . . . . . . . . .
Operating Manifold Gauge Set and Service Valves 4. . .
Recovering Refrigerant from Existing System 6. . . . . . .
New Unit Placement 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing and Installing Louvers 8. . . . . . . . . . . . . . . . . .
New or Replacement Line Set 9. . . . . . . . . . . . . . . . . . . . .
Brazing Connections 11. . . . . . . . . . . . . . . . . . . . . . . . . . .
Flushing Line Set and Indoor Coil 14. . . . . . . . . . . . . . . .
Installing Indoor Metering Device 15. . . . . . . . . . . . . . . .
Leak Test Line Set and Indoor Coil 16. . . . . . . . . . . . . . .
Evacuating Line Set and Indoor Coil 17. . . . . . . . . . . . .
Electrical Connections 18. . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Unit Delivered Void of Charge 22. . . . . . . . . . .
Unit Start−Up 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Refrigerant 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Operation 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up and Performance Checklist 30. . . . . . . . . . . . . .
Shipping and Packing List
Litho U.S.A.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox Engineering Handbook. Coils
previously charged with HCFC−22 must be flushed.
NOTICE TO INSTALLER
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)
1 Liquid line filter drier
General
It is critical for proper unit operation to place outdoor unit on an
UNIT PLACEMENT
elevated surface as described in Unit Placement section on page 7.
BRAZING LINE SET TO SERVICE VALVES
It is imperative to follow the brazing technique illustrated starting on
page 11 to avoid damaging the service valve’s internal seals.
07/11 506645−01
14ACX Air Conditioners, which will also be referred to in
this instruction as the outdoor unit, uses HFC−410A
refrigerant. This outdoor unit must be installed with a
matching indoor unit and line set as outlined in the Lennox
14ACX 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
*2P0711* *P506645-01*
Unit Dimensions − Inches (mm)
A
OUTDOOR
COIL FAN
COMPRESSOR
A
DISCHARGE AIR
B
SUCTION AND LIQUID
LINE CONNECTION
OPTIONAL UNIT STANDOFF KIT (4)
SIDE VIEW
Model Numbers A B
14ACX−018−230 24−1/4 (616) 29−1/4 (743)
14ACX−024−230 28−1/4 (724) 33−1/4 (845)
14ACX−030−230 28−1/4 (724) 37−1/4 (946)
14ACX−036−230 28−1/4 (724) 37−1/4 (946)
14ACX−042−230 28−1/4 (724) 29−1/4 (743)
14ACX−041−230 and 14ACX−048−230 28−1/4 (724) 37−1/4 (946)
14ACX−059−230 32−1/4 (819) 37−1/4 (946)
14ACX−047−230 and 14ACX−060−230 32−1/4 (819) 33−1/4 (845)
(FIELD INSTALLED)
SIDE VIEW
506645−01
Page 2
Typical Unit Parts Arrangement
NOTE Plumbing layout and compressor type may vary between model sizes.
CONTROL
GROUND LUG
CONTACTOR
CUTOUT FOR HIGH
VOLTAGE CONDUIT
NOTE − −041, −047, −048, −059 and −060 only are equipped with crankcase thermostat (S40) and
crankcase heater (HR1).
(K1)
DUAL RUN
CAPACITOR
(C12)
DISCHARGE LINE
COMPRESSOR
HARNESS
CONNECTION
OUTDOOR COIL
CONTROL WIRE
LOOP
CRANKCASE HEATER
THERMOSTAT (S40)
LIQUID LINE SERVICE VALVE
THERMAL SWITCH
(S173) (−036 AND
−060 ONLY)
SEE NOTE
COMPRESS0R (B1)
CRANKCASE HEATER
SEE NOTE
(HR1)
SUCTION LINE SERVICE VALVE
HIGH PRESSURE SWITCH (S4)
Model Number Identification
Nominal SEER
Unit Type
AC = Air Conditioner
Refrigerant
X = R−410A
Figure 1. Typical Unit Parts Arrangement
AC X14 024 −
−−
230
13
Voltage
230 = 208/230V−1phase−60hz
Cooling Capacity − Tons
018 = 1.5
024 = 2
030 = 2.5
036 = 3
041 = 3.5
042 = 3.5
047 = 4
048 = 4
059 = 5
060 = 5
Minor Revision Number
Page 3
14ACX SERIES
CAUTION
IMPORTANT
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
Operating Manifold Gauge Set and
Service Valves
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
who have jurisdiction before installation.
TORQUE REQUIREMENTS
When servicing or repairing heating, ventilating, and air
conditioning components, ensure the fasteners are
appropriately tightened. Table 1 lists torque values for
fasteners.
IMPORTANT
Only use Allen wrenches of sufficient hardness (50Rc −
Rockwell Harness Scale minimum). Fully insert the
wrench into the valve stem recess.
Service valve stems are factory−torqued (from 9 ft−lbs for
small valves, to 25 ft−lbs for large valves) to prevent
refrigerant loss during shipping and handling. Using an
Allen wrench rated at less than 50Rc risks rounding or
breaking off the wrench, or stripping the valve stem
recess.
See the Lennox Service and Application Notes #C−08−1
for further details and information.
To prevent stripping of the various caps used, the
appropriately sized wrench should be used and fitted
snugly over the cap before tightening.
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 provides
torque values for fasteners.
Table 1. Torque Requirements
Parts Recommended Torque
Service valve cap 8 ft.− lb. 11 NM
Sheet metal screws 16 in.− lb. 2 NM
Machine screws #10 28 in.− lb. 3 NM
Compressor bolts 90 in.− lb. 10 NM
Gauge port seal cap 8 ft.− lb. 11 NM
USING MANIFOLD GAUGE SET
When checking the system charge, only use a manifold
gauge set that features low loss anti−blow back fittings.
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.
OPERATING SERVICE VALVES
The liquid and vapor line service valves are used for
removing refrigerant, flushing, leak testing, evacuating,
checking charge and charging.
Each valve is equipped with a service port which has a
factory−installed valve stem. Figure 2 provides information
on how to access and operating both angle and ball service
valves.
506645−01
Page 4
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
TO INDOOR
UNIT
(VALVE STEM SHOWN OPEN)
INSERT HEX WRENCH HERE
CLOSED) INSERT HEX
WRENCH HERE
SERVICE PORT
CORE
TO OUTDOOR UNIT
ANGLE−TYPE SERVICE VALVE
(BACK−SEATED OPENED)
When service valve is OPEN, the service port is
open to linE set, indoor and outdoor unit.
Operating Ball Type Service Valve:
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°.
TO INDOOR UNIT
TO OPEN ROTATE STEM
COUNTERCLOCKWISE 90°.
TO CLOSE ROTATE STEM
CLOCKWISE 90°.
SERVICE PORT
SERVICE PORT
CORE
SERVICE PORT
CAP
TO OUTDOOR
UNIT
BALL (SHOWN
CLOSED)
VALV E
STEM
STEM CAP
STEM CAP
ANGLE−TYPE SERVICE VALVE
(FRONT−SEATED CLOSED)
WHEN SERVICE VALVE IS CLOSED, THE SERVICE PORT IS OPEN
TO
THE LINE SET AND INDOOR UNIT.
To Access 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 set to service port.
3. When testing is completed, replace service port cap and tighten as
follows:
With torque wrench: Finger tighten and
torque cap per table 1.
Without torque wrench: Finger tighten and
use an appropriately sized wrench to turn
an additional 1/6 turn clockwise.
Reinstall Stem Cap:
Stem cap protects the valve stem from damage and serves as the
primary seal. Replace the stem cap and tighten as follows:
9
10
8
11
12
7
6
With Torque Wrench: Finger tighten and
then torque cap per table 1.
Without Torque Wrench: Finger tight-
en and use an appropriately sized
wrench to turn an additional 1/12 turn
clockwise.
9
10
8
11
12
7
6
1/6 TURN
1
2
3
4
5
1/12 TURN
1
2
3
4
5
NOTE A label with specific torque requirements may be affixed to the stem cap. If the label is present, use the specified torque.
Figure 2. Angle and Ball Service Valves
Page 5
14ACX SERIES
Recovering Refrigerant from Existing System
Use the following procedure to recover refrigerant from an existing system (indoor coil, line set and outdoor unit).
DISCONNECT POWER
Disconnect all power to the existing outdoor unit at the service
12
disconnect switch or main fuse box/breaker panel.
MAIN FUSE BOX/BREAKER PANEL
SERVICE
DISCONNECT
SWITCH
RECOVERING REFRIGERANT
Remove existing HCFC−22 refrigerant using one of the following procedures:
3
IMPORTANT Some system configurations may contain higher than normal refrigerant charge due to either large internal coil volumes,
and/or long line sets.
CONNECT MANIFOLD GAUGE SET
Connect a gauge set, clean recovery cylinder and a recovery
machine to the service ports of the existing unit. Use the
instructions provided with the recovery machine to make the
connections.
MANIFOLD GAUGES
RECOVERY MACHINE
LOW
CLEAN RECOVERY
CYLINDER
OUTDOOR UNIT
HIGH
METHOD 1:
Us this method if the existing outdoor unit is not equipped with shut−off valves, or if the unit is not operational and you plan to use the existing
HCFC−22 to flush the system.
Remove all HCFC−22 refrigerant from the existing system. Check gauges after shutdown to confirm that the entire system is completely void of
refrigerant.
METHOD 2:
Use this method if the existing outdoor unit is equipped with manual shut−off valves, and you plan to use new HCFC−22 refrigerant to flush the
system.
The following devices could prevent full system charge recovery into the outdoor unit:
Outdoor unit’s high or low−pressure switches (if applicable) when tripped can cycle 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 vapor 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:
A Start the existing HCFC−22 system in the cooling mode and close the liquid line valve.
B Use the compressor to pump as much of the existing HCFC−22 refrigerant into the outdoor unit until the outdoor system is full. Turn the outdoor unit
main power OFF and use a recovery machine to remove the remaining refrigerant from the system.
NOTE It may be necessary to bypass the low pressure switches (if equipped) to ensure complete refrigerant evacuation.
C When the low side system pressures reach 0 psig, close the vapor line valve.
D Check gauges after shutdown to confirm that the valves are not allowing refrigerant to flow back into the low side of the system.
Figure 3. Refrigerant Recovery Procedure
506645−01
Page 6
CLEARANCE ON ALL SIDES INCHES (MILLIMETERS)
MINIMUM CLEARANCE
ABOVE UNIT
12 (305)
6 (152)
36 (914)
ACCESS PANEL
30 (762)
LINE SET
CONNECTIONS
MINIMUM CLEARANCE BETWEEN
TWO UNITS
24 (610)
Figure 4. Installation Clearances
NOTES:
Clearance to one of the other three
sides must be 36 inches (914mm).
Clearance to one of the remaining
two sides may be 12 inches
(305mm) and the final side may be
6 inches (152mm).
ACCESS PANEL
LINE SET
CONNECTIONS
48 (1219)
DETAIL A
INSTALL UNIT AWAY
FROM WINDOWS
TWO 90 ELBOWS INSTALLED IN LINE SET
WILL REDUCE LINE SET VIBRATION
Figure 5. Placement, and Slab Mounting
New Unit Placement
See Unit Dimensions on page 2 for sizing mounting slab,
platforms or supports. Refer to figure 4 for mandatory
installation clearance requirements.
POSITIONING CONSIDERATIONS
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
DETAIL B
Install unit level or, if on a slope, maintain slope tolerance of 2 degrees
(or 2 inches per 5 feet [50 mm per 1.5 m]) away from building structure.
BUILDING
STRUCTURE
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 5,
detail A.
DISCHARGE AIR
MOUNTING
SLAB
GROUND LEVEL
Page 7
14ACX SERIES
PLACING UNIT ON SLAB
When installing unit at grade level, the top of the slab
should be high enough above grade so that water from
higher ground will not collect around the unit. The slab
should have a slope tolerance as described in figure 5,
detail B.
ROOF MOUNTING
Install the unit at a minimum of 4 inches (102 mm) above
the surface of the roof. Ensure the weight of the unit is
properly distributed over roof joists and rafters. Redwood
or steel supports are recommended.
Removing and Installing Louvers
WARNING
To prevent personal injury, or damage to panels, unit or structure, be sure to observe the following:
While installing or servicing this unit, carefully stow all removed panels out of the way, so that the panels will not cause injury to personnel,
nor cause damage to objects or structures nearby, nor will the panels be subjected to damage (e.g., being bent or scratched).
While handling or stowing the panels, consider any weather conditions, especially windy conditions, that may cause panels to be blown
around and battered.
NOTICE
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorb oil and cause the
rubber to swell when it comes into contact with oil. The
rubber will then bubble and could cause leaks. Protect
the roof surface to avoid exposure to refrigerant and oil
during service and installation. Failure to follow this
notice could result in damage to roof surface.
When removing the unit panels. Remove panel A first, then B, C and
finally D. When reinstalling panels, reverse that order starting with panel
D, C, B and finally A.
REMOVAL
STEP 1
TO REMOVE PANEL,
REMOVE MOUNTING
SCREWS SECURING
PANEL TO THE UNIT.
PANEL A
STEP 2
SLIGHTLY LIFT PANEL A IN
ORDER TO CLEAR SIDE
LIPS OF PANEL FROM
BASE OF UNIT.
STEP 3
TILT PANEL OUT SLIGHTLY
AND PULL DOWNWARD
TO REMOVE.
REPEAT STEPS 1, 2 AND
3 TO REMOVE PANELS B,
C AND FINALLY D.
PANEL A
PANEL B
WARNING
PANEL A
INSTALLATION
STEP 1
STARTING WITH PANEL D,
INSERT PANEL UNDER UNIT
TOP CAP LIP AND LIFT
SLIGHTLY TO CLEAR SIDE LIP
OF PANEL FROM BASE.
STEP 2
MOVE PANEL IN TOWARDS UNIT.
ALIGN LEFT/RIGHT SIDE LIPS OF
PANEL WITH GROOVE INSERTS
ALONG LEFT/RIGHT SIDE OF UNIT.
SIDE
GROOVE
STEP 3
SECURE PANEL, WITH
MOUNTING SCREWS.
REPEAT STEPS 1 AND 2 TO
INSTALL PANELS C, B AND
FINALLY A.
PANEL C
PANEL D
TOP CAP
BASE
PANEL D
506645−01
Figure 6. Louvers
Page 8
New or Replacement Line Set
This section provides information on new installation or
replacement of existing line set. If a new or replacement
line set is not required, then proceed to Brazing
Connections on page 11.
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.
NOTE − When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, CORP. 9351−L9, or contact
Lennox Technical Support Product Applications for
assistance.
To obtain the correct information from Lennox, be sure to
communicate the following points:
Model (14ACX) 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.
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.
Recommended topping−off POE oils are Mobil EAL
ARCTIC 22 CC or ICI EMKARATE RL32CF.
MATCHING WITH NEW OR EXISTING INDOOR COIL
AND LINE SET
The RFC1−metering line consisted of a small bore copper
line that ran from condenser to evaporator coil. Refrigerant
was metered into the evaporator by utilizing
temperature/pressure evaporation effects on refrigerant in
the small RFC line. The length and bore of the RFC line
corresponded to the size of cooling unit.
If the 14ACX 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 14ACX unit.
Typically a liquid line used to meter flow is 1/4" in diameter
and copper.
LIQUID LINE FILTER DRIER INSTALLATION
The filter drier (one is shipped with each 14ACX 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 (fixed orifice or TXV) as illustrated in figure 7. This
filter drier 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 Connections page 11 for
special procedures on brazing filter drier connections to
the liquid line.
BRAZE CONNECTION POINTS
IMPORTANT
Mineral oils are not compatible with HFC−410A. If oil
must be added, it must be a Polyol ester oil.
The compressor is charged with sufficient Polyol ester oil
for line set lengths up to 50 feet. Recommend adding oil to
system based on the amount of refrigerant charge in the
system. No need to add oil in system with 20 pounds of
refrigerant or less. For systems over 20 pounds − add one
ounce of every five pounds of refrigerant.
Table 2. Refrigerant Line Set Inches (mm)
Model Number
14ACX−018−230
14ACX−024−230
14ACX−030−230
14ACX−036−230
14ACX−041−230
14ACX−042−230
14ACX−047−230
14ACX−048−230
14ACX−059−230
14ACX−060−230
NOTE Some applications may required a field provided 7/8" to 1−1/8" adapter
Valve Field Size Connections Recommended Line Set
Liquid Line Suction Line Liquid Line Suction Line L15 Series Line Sets
3/8 in. (10 mm) 3/4 in. (19 mm) 3/8 in. (10 mm) 3/4 in. (19 mm)
3/8 in. (10 mm) 7/8 in. (22 mm) 3/8 in. (10 mm) 7/8 in. (22 mm)
3/8 in. (10 mm) 1−1/8 in. (29 mm) 3/8 in. (10 mm) 1−1/8 in. (29 mm) Field Fabricated
LIQUID
LINE
OUTDOOR
UNIT
LIQUID LINE
SERVICE VALVE
LINE
LIQUID LINE
FILTER DRIER
igure 7. Typical Liquid Line Filter Drier Installation
L15−41 15 feet to 50 feet (4.6 meters to
15 meters)
L15−65 15 feet to 50 feet (4.6 meters to
15 meters)
Page 9
14ACX SERIES
LINE SET
INSTALLATION
Line Set Isolation The following illustrations are
examples of proper refrigerant line set isolation:
REFRIGERANT LINE SET TRANSITION
FROM VERTICAL TO HORIZONTAL
ANCHORED HEAVY NYLON
WIRE TIE OR AUTOMOTIVE
MUFFLER-TYPE HANGER
AUTOMOTIVE
MUFFLER-TYPE HANGER
IMPORTANT Refrigerant lines must not contact structure.
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
temperature of the liquid line or when pressure drop is equal to or greater
than 20 psig.
IMPORTANT Refrigerant lines must not contact wall
OUTSIDE WALL
VAPOR LINE
LIQUID LINE
WALL
STUD
STRAP LIQUID LINE TO
VAPOR LINE
LIQUID LINE
NON−CORROSIVE
METAL SLEEVE
VAPOR LINE − WRAPPED
IN ARMAFLEX
REFRIGERANT LINE SET INSTALLING
HORIZONTAL RUNS
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)
8 FEET (2.43 METERS)
STRAPPING
MATERIAL (AROUND
VAPOR LINE ONLY)
TAPE OR
WIRE TIE
FLOOR JOIST OR
ROOF RAFTER
8 FEET (2.43 METERS)
NON−CORROSIVE
METAL SLEEVE
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
WIRE TIE
INSIDE WALL
WOOD BLOCK
BETWEEN STUDS
SLEEVE
VAPOR LINE WRAPPED
WITH ARMAFLEX
OUTSIDE
WALL
PVC
PIPE
FIBERGLASS
INSULATION
CAULK
STRAP
NON−CORROSIVE
METAL SLEEVE
WIRE TIE
WOOD BLOCK
WIRE TIE
STRAP
LIQUID
LINE
NOTE Similar installation practices should be used if line set is
to be installed on exterior of outside wall.
FLOOR JOIST OR
506645−01
ROOF RAFTER
Figure 8. Line Set Installation Guidelines
Page 10
Brazing Connections
Use the procedures outline in figures 9 and 10 for brazing
line set connections to service valves.
IMPORTANT
Polyol ester (POE) oils used with HFC−410A
refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept closed
as much as possible. DO NOT remove line set caps
or service valve stub caps until you are ready to make
connections.
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.
WARNING
When using a high pressure gas such as
dry nitrogen to pressurize a refrigeration
or air conditioning system, use a
regulator that can control the pressure
down to 1 or 2 psig (6.9 to 13.8 kPa).
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.
Wash hands with soap and water after handling brazing
alloys and flux.
IMPORTANT
Connect gauge set low pressure side to vapor line
service valve and repeat procedure starting at
paragraph 4 for brazing the liquid line to service port
valve.
IMPORTANT
Allow braze joint to cool before removing the wet rag
from the service valve. Temperatures above 250ºF can
damage valve seals.
IMPORTANT
Use silver alloy brazing rods with 5% minimum silver
alloy for copper−to−copper brazing. Use 45% minimum
alloy for copper−to−brass and copper−to−steel brazing.
WARNING
Fire, Explosion and Personal Safety
Hazard.
Failure to follow this warning could
result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause fire and/or an explosion, that could result in property
damage, personal injury or death.
Page 11
14ACX SERIES
CUT AND DEBUR
Cut ends of the refrigerant lines square (free from nicks or dents)
1
and debur the ends. The pipe must remain round. Do not crimp end
of the line.
CUT AND DEBUR
LINE SET SIZE MATCHES
SERVICE VALVE CONNECTION
SERVICE VALVE
COPPER TUBE
REDUCER
CONNECTION
STUB
CAP AND CORE REMOVAL
Remove service cap and core from
2
both the suction / vapor and liquid line
service ports.
SERVICE PORT
CAP
SERVICE
PORT
CORE
LIQUID LINE SERVICE
VALV E
SERVICE
PORT
CORE
SERVICE
PORT CAP
SUCTION / VAPOR LINE
SERVICE VALVE
LINE SET SIZE IS SMALLER
THAN CONNECTION
REFRIGERANT LINE
DO NOT CRIMP SERVICE VALVE
CONNECTOR WHEN PIPE IS
SMALLER THAN CONNECTION
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 Connect gauge set low pressure side to
liquid line service valve (service port).
B Connect gauge set center port to bottle of
nitrogen with regulator.
C Remove core from valve in suction / vapor
line service port to allow nitrogen to escape.
SUCTION / VAPOR SERVICE PORT MUST BE
OPEN TO ALLOW EXIT POINT FOR NITROGEN
VAPOR LINE
INDOOR
UNIT
LIQUID LINE
ATTACH
GAUGES
C
LIQUID LINE SERVICE
SUCTION /
VAPOR LINE
SERVICE
VALV E
VALV E
HIGHLOW
B
OUTDOOR
UNIT
WHEN BRAZING LINE SET TO
A
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
USE REGULATOR TO FLOW
NITROGEN AT 1 TO 2 PSIG.
NITROGEN
506645−01
Figure 9. Brazing Procedures
Page 12
WRAP SERVICE VALVES
To help protect service valve seals during brazing, wrap water saturated cloths around service valve bodies and copper tube stubs. Use
4
additional water saturated cloths underneath the valve body to protect the base paint.
FLOW NITROGEN
Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and
5
out of the suction / vapor valve stem port. See steps 3A, 3B and 3C on manifold gauge set connections
BRAZE LINE SET
Wrap both service valves with water saturated cloths as illustrated here and as mentioned in step 4, before brazing to line set. Water
6
saturated 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.
LIQUID LINE
WATER SATURATED
CLOTH
WARNING
1. FIRE, PERSONAL INJURY, OR PROPERTY
DAMAGE will 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 in the line set! The braze, when complete,
must be quenched with water to absorb any residual
heat.
2. Do not open service valves until refrigerant lines and
indoor coil have been leak−tested and evacuated.
Refer to procedures provided in this supplement.
SUCTION / VAPOR LINE
PREPARATION FOR NEXT STEP
After all connections have been brazed, disconnect manifold gauge set from service ports. Apply additional water saturated cloths to both
7
services valves to cool piping. Once piping is cool, remove all water saturated cloths. Refer to the unit installation instructions for the next step
in preparing the unit.
SUCTION / VAPOR LINE
SERVICE VALVE
WATER SATURATED
CLOTH
WHEN BRAZING LINE SET TO
SERVICE VALVES, POINT FLAME
AWAY FROM SERVICE VALVE.
Figure 10. Brazing Procedures (continued)
Page 13
14ACX SERIES
Flushing Line Set and Indoor Coil
Flushing is only required if existing indoor coil and line set are to be used. Otherwise proceed to Installing Indoor Metering
Device on page 15.
TYPICAL EXISTING FIXED ORIFICE
1A
DISTRIBUTOR
ASSEMBLY
A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor as-
sembly.
C Using two wrenches, disconnect liquid line from liquid line orifice hous-
ing. Take care not to twist or damage distributor tubes during this process.
D Remove and discard fixed orifice, valve stem assembly if present and
Teflon® washer as illustrated above.
E Use a field−provided fitting to temporary reconnect the liquid line to the
indoor unit’s liquid line orifice housing.
COIL SHOWN)
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
REMOVE AND DISCARD
WHITE TEFLON
(IF PRESENT)
TEFLON® RING
FIXED ORIFICE
®
SEAL
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
REMOVAL PROCEDURE (UNCASED
OR
BRASS NUT
1B
TWO PIECE PATCH PLATE
(UNCASED COIL ONLY)
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
2
INVERTED HCFC−22
CYLINDER CONTAINS
CLEAN HCFC−22 TO BE
USED FOR FLUSHING.
A
1
VAPOR LINE
SERVICE VALVE
EXISTING
INDOOR
UNIT
LIQUID LINE SERVICE
VALV E
VAPOR
LIQUID
D
RECOVERY
CYLINDER
A Inverted HCFC−22 cylinder with clean refrigerant to the vapor service
valve.
B HCFC−22 gauge set (low side) to the liquid line valve.
C HCFC−22 gauge set center port to inlet on the recovery machine with an
empty recovery tank to the gauge set.
D Connect recovery tank to recovery machines per machine instructions.
OUTDOOR
B
NEW
UNIT
OPENED
C
RECOVERY MACHINE
GAUGE
MANIFOLD
LOW HIGH
CLOSED
TANK
RETURN
INLET
DISCHARGE
TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)
ORIFICE
HOUSING
EQUALIZER
LINE
STUB END
TEFLON
RING
VAPOR
CHECK
EXPANSION
VALV E
®
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
LINE
TEFLON
RING
®
SENSING
LINE
LIQUID
LINE
LIQUID LINE
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER
LINE FITTING
SENSING BULB
A On fully cased coils, remove the coil access and plumbing panels.
B Remove any shipping clamps holding the liquid line and distributor
assembly.
C Disconnect the equalizer line from the check expansion valve
equalizer line fitting on the vapor line.
D Remove the vapor line sensing bulb.
E Disconnect the liquid line from the check expansion valve at the liquid
line assembly.
F Disconnect the check expansion valve from the liquid line orifice
housing. Take care not to twist or damage distributor tubes during this
process.
G Remove and discard check expansion valve and the two Teflon® rings.
H Use a field−provided fitting to temporary reconnect the liquid line to the
indoor unit’s liquid line orifice housing.
FLUSHING LINE SET
The line set and indoor unit coil must be flushed with at least the
3
same amount of clean refrigerant that previously charged the
system. Check the charge in the flushing cylinder before
proceeding.
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
set and indoor unit coil.
B
B Invert the cylinder of clean HCFC−22 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 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 down to 0
the system.
D 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.
506645−01
Figure 11. Removing Metering Device and Flushing
Page 14
Installing Indoor Metering Device
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 Lennox 14ACX Engineering Handbook 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 Leak Test Line Set and Indoor Coil on page 16.
INDOOR EXPANSION VALVE INSTALLATION
TWO PIECE
PATCH PLATE
(UNCASED
COIL ONLY)
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING (SEE
EQUALIZER LINE
INSTALLATION FOR
FURTHER DETAILS)
(Uncased Coil Shown)
LIQUID LINE
ORIFICE
HOUSING
STUB
END
TEFLON
RING
EQUALIZER
LINE
VAPOR
EXPANSION
VALV E
®
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
LINE
TEFLON
RING
LIQUID LINE
Sensing bulb insulation is required if
mounted external to the coil casing. sensing
bulb installation for bulb positioning.
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 to the right.
B 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 to the right.
®
SENSING
LINE
A Remove the field−provided fitting that temporary
reconnected the liquid line to the indoor unit’s distributor
assembly.
B Install one of the provided Teflon® rings around the
stubbed end of the expansion valve and lightly lubricate
the connector threads and expose surface of the Teflon
ring with refrigerant oil.
C Attach the stubbed end of the expansion valve to the
liquid line orifice housing. Finger tighten and use an
appropriately sized wrench to turn an additional 1/2 turn
clockwise as illustrated in the figure above, or 20 ft−lb.
D Place the remaining Teflon® washer around the other
end of the expansion valve. Lightly lubricate connector
threads and expose surface of the Teflon® ring with
refrigerant oil.
E Attach the liquid line assembly to the expansion valve.
Finger tighten and use an appropriately sized wrench to
turn an additional 1/2 turn clockwise as illustrated in the
figure above or 20 ft−lb.
SENSING BULB INSTALLATION
A Attach the vapor line sensing bulb in the proper
orientation as illustrated to the right using the clamp and
screws provided.
NOTE Confirm proper thermal contact between vapor line
and expansion bulb before insulating the sensing bulb once
installed.
B Connect the equalizer line from the expansion valve to
the equalizer vapor port on the vapor line. Finger tighten
the flare nut plus 1/8 turn (7 ft−lbs) as illustrated below.
VAPOR LINE
BULB
12
ON LINES SMALLER THAN
7/8", MOUNT SENSING
BULB AT EITHER THE 3 OR
9 O’CLOCK POSITION.
BULB
®
1/2 Turn
11
10
9
8
7
1/8 Turn
11
10
9
8
7
12
1
2
3
4
5
6
12
1
2
3
4
5
6
FLARE SEAL CAP
OR
FLARE NUT
COPPER FLARE
SEAL BONNET
MALE BRASS EQUALIZER
LINE FITTING
VAPOR LINE
VAPOR LINE
BULB
NOTE NEVER MOUNT ON BOTTOM OF LINE.
Figure 12. Installing Indoor Expansion Valve
Page 15
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O’CLOCK
12
POSITION. NEVER MOUNT ON
BOTTOM OF LINE.
BULB
14ACX SERIES
IMPORTANT
Leak Test Line Set and Indoor Coil
The Environmental Protection Agency (EPA) prohibits
the intentional venting of HFC refrigerants during
maintenance, service, repair and disposal of appliance.
Approved methods of recovery, recycling or reclaiming
must be followed.
IMPORTANT
If this unit is being matched with an approved line set
or indoor unit coil which was previously charged with
mineral oil, or if it is being matched with a coil which
was manufactured before January of 1999, the coil
and line set must be flushed prior to installation. Take
care to empty all existing traps. Polyol ester (POE) oils
are used in Lennox units charged with HFC−410A
refrigerant. Residual mineral oil can act as an
insulator, preventing proper heat transfer. It can also
clog the expansion device, and reduce the system
performance and capacity.
Failure to properly flush the system per the
instructions below will void the warranty.
CONNECT GAUGE SET
A Connect an HFC−410A manifold gauge set high pressure
1
hose 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.
IMPORTANT
Leak detector must be capable of sensing HFC
refrigerant.
After completing the leak testing the line set and indoor coil
as outlined in figure 13, proceed to Evacuating Line Set
and Indoor Coil on page 17.
WARNING
When using a high pressure gas such as
dry nitrogen to pressurize a refrigeration
or air conditioning system, use a
regulator that can control the pressure
down to 1 or 2 psig (6.9 to 13.8 kPa).
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.
HIGHLOW
MANIFOLD GAUGE SET
OUTDOOR UNIT
B
A
2
506645−01
TO VAPOR
SERVICE VALVE
NITROGEN
HFC−410A
TEST FOR LEAKS
After the line set has been connected to the indoor and outdoor units, check the line set connections and indoor unit for leaks. Use the
following procedure to test for leaks:
A With both manifold valves closed, connect the cylinder of HFC−410A refrigerant to the center port of the manifold gauge set. Open the valve
on the HFC−410A cylinder (vapor only).
B Open the high pressure side of the manifold to allow HFC−410A into the line set and indoor unit. Weigh in a trace amount of HFC−410A. [A
trace amount is a maximum of two ounces (57 g) 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.
C Connect a cylinder of dry nitrogen with a pressure regulating valve to the center port of the manifold gauge set.
D Adjust dry nitrogen pressure to 150 psig (1034 kPa). Open the valve on the high side of the manifold gauge set in order to pressurize the line set
and the indoor unit.
E After a few minutes, open one of the service valve ports and verify that the refrigerant added to the system earlier is measurable with a leak
detector.
F After leak testing disconnect gauges from service ports.
Figure 13. Leak Test
Page 16
Evacuating Line Set and Indoor Coil
CONNECT GAUGE SET
NOTE Remove cores from service valves (if not already done).
1
A Connect low side of manifold gauge set
with 1/4 SAE in−line tee to vapor line
service valve
B Connect high side of manifold gauge
set to liquid line service valve
C Connect micron gauge available
connector on the 1/4 SAE in−line tee.
D Connect the vacuum pump (with
vacuum gauge) to the center port of the
manifold gauge set. The center port
line will be used later for both the
HFC−410A and nitrogen containers.
NITROGEN
HFC−410A
VACUUM PUMP
OUTDOOR
UNIT
A
B
A34000 1/4 SAE TEE WITH
SWIVEL COUPLER
500
C
MICRON
GAUGE
MANIFOLD
GAUGE SET
TO VAPOR
SERVICE VALVE
TO LIQUID LINE
SERVICE VALVE
LOW
D
EVACUATE THE SYSTEM
A Open both manifold valves and start the vacuum pump.
2
B Evacuate the line set and indoor unit to an absolute pressure of 23,000 microns (29.01 inches of mercury).
NOTE During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once. A rapid rise in pressure
indicates a relatively large leak. If this occurs, repeat the leak testing procedure.
NOTE The term absolute pressure means the total actual pressure 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.
C When the absolute pressure reaches 23,000 microns (29.01 inches of mercury), perform the following:
Close manifold gauge valves
Close valve on vacuum pump
Turn off vacuum pump
Disconnect manifold gauge center port hose from vacuum pump
Attach manifold center port hose to a dry nitrogen cylinder with pressure regulator set to 150 psig (1034 kPa) and purge the hose.
Open manifold gauge valves to break the vacuum in the line set and indoor unit.
Close manifold gauge valves.
D 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.
E Reconnect the manifold gauge to the vacuum pump, turn the pump on, and continue to evacuate the line set and indoor unit until the
absolute pressure does not rise above 500 microns (29.9 inches of mercury) within a 20−minute period after shutting off the vacuum pump
and closing the manifold gauge valves.
F When the absolute pressure requirement above has been met, disconnect the manifold hose from the vacuum pump and connect it to an
upright cylinder of HFC−410A 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:
Close manifold gauge valves.
Shut off HFC−410A cylinder.
Reinstall service valve cores by removing manifold hose from service valve. Quickly install cores with core
tool while maintaining a positive system pressure.
Replace stem caps and secure finger tight, then tighten an additional one−sixth (1/6) of a turn as illustrated.
RECOMMEND
MINIMUM 3/8" HOSE
10
9
11
8
7
HIGH
1/6 TURN
12
1
5
6
2
3
4
Figure 14. Evacuating System
Page 17
14ACX SERIES
WARNING
Danger of Equipment Damage. Avoid deep vacuum
operation. Do not use compressors to evacuate a
system. Extremely low vacuums can cause internal
arcing and compressor failure. Damage caused by
deep vacuum operation will void warranty.
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.
Wash hands with soap and water after handling brazing
alloys and flux.
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.
IMPORTANT
Use a thermocouple or thermistor electronic vacuum
gauge that is calibrated in microns. Use an instrument
capable of accurately measuring down to 50 microns.
Electrical
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to the furnace or air handler installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
24VAC TRANSFORMER
Use the transformer provided with the furnace or air
handler for low-voltage control power (24VAC − 40 VA
minimum)
SIZE CIRCUIT AND INSTALL SERVICE
DISCONNECT SWITCH
Refer to the unit nameplate for minimum circuit ampacity, and maximum
fuse or circuit breaker (HACR per NEC). Install power wiring and properly
sized disconnect switch.
MAIN FUSE BOX/
BREAKER PANEL
SERVICE
DISCONNECT
SWITCH
NOTE Units are approved for use only with copper conductors.
Ground unit at disconnect switch or to an earth ground.
WARNING
Electric Shock Hazard. Can cause injury or death. Unit must be grounded in accordance with national and
local codes.
Line voltage is present at all components when unit is not in operation on units with single-pole contactors.
Disconnect all remote electric power supplies before opening access panel. Unit may have multiple power
supplies.
INSTALL THERMOSTAT
Install room thermostat (ordered separately) on an inside wall
approximately in the center of the conditioned area and 5 feet (1.5m) from
the floor. It should not be installed on an outside wall or where it can be
affected by sunlight or drafts.
THERMOSTAT
5 FEET
(1.5M)
NOTE 24VAC, Class II circuit connections are made in the control
panel.
506645−01
Page 18
ROUTING HIGH VOLTAGE/ GROUND AND CONTROL WIRING
HIGH VOLTAGE / GROUND WIRES
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.
LOW VOLTAGE CONTROL WIRING
NOTE Wire tie provides low voltage control wire strain relief and to
maintain separation of field installed low and high voltage circuits.
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.
Install low voltage wiring from outdoor to indoor unit and from thermostat
to indoor unit as illustrated.
A Run 24VAC control wires through hole with grommet and secure with
provided wire tie.
B Make 24VAC thermostat wire connections. Locate the two wires from the
contactor and make connection using field provided wire nuts:
S Yellow to Y1
S Black to C (common)
WIRE RUN LENGTH AWG# INSULATION TYPE
LESS THAN 100’ (30 METERS) 18 TEMPERATURE RATING
MORE THAN 100’ (30 METERS) 16 35ºC MINIMUM.
HIGH VOLTAGE
CONNECTIONS
(CONTACTOR)
GROUND
HIGH VOLTAGE
FIELD WIRING
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
THERMOSTAT
R
W1
Y
G
C
POWER
HEAT
COOLING
INDOOR
BLOWER
COMMON
SINGLE PHASE
INDOOR UNIT
R
W
Y
G
C
CONTROL
HIGH VOLTAGE
FLEXIBLE
CONDUIT
YELLOW
BLACK
B
WIRING
OUTDOOR
UNIT
Y1
C
A
GROMMET AND
WIRE TIE
Figure 15. Typical Field Wiring Diagram
Page 19
14ACX SERIES
506645−01
CRANKCASE HEATER (HR1)
Figure 16. Typical Factory Wiring Diagram (Copeland Compressor)
Page 20
HIGH PRESSURE SWITCH
(S4) LIQUID LINE
CRANKCASE THERMOSTAT (S40)
THERMAL PROTECTION
SWITCH (S5 OR S173)
CRANKCASE HEATER (HR1)
Figure 17. Typical Factory Wiring Diagram (Interlink Compressor)
Page 21
HIGH PRESSURE SWITCH
(S4) LIQUID LINE
CRANKCASE THERMOSTAT (S40)
14ACX SERIES
Servicing Units Delivered Void of Charge
If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
1. Leak check system using procedure outlined in this
instruction.
2. Evacuate the system using procedure outlined in this
instruction.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again using procedure outlined
in this instruction.
5. Weigh in refrigerant using procedure outlined under
Start−Up and Charging Procedures.
6. 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.
Unit Start−Up
2. Inspect all factory− and field−installed wiring for loose
connections.
3. After evacuation is complete, open the liquid line and
suction line service valve stems (Operating Service
Valves on page 4) to release the refrigerant charge
(contained in outdoor unit) into the system.
4. Replace the stem caps and tighten to the value listed
in table 1.
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. Connect manifold gauge set for testing and charging
using figure 18 as a guideline.
7. 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.
8. Recheck voltage while the unit is running. Power must
be within range shown on the unit nameplate.
9. Check system for sufficient refrigerate using the
procedures outlined in under System Refrigerant.
IMPORTANT
If unit is equipped with a crankcase heater, it should be
energized 24 hours before unit start−up to prevent
compressor damage as a result of slugging.
1. Rotate fan to check for binding.
GAUGE SET
CONNECTIONS FOR TESTING AND CHARGING
SUCTION LINE
B
SERVICE PORT
CONNECTION
AClose manifold gauge set valves and connect
the center hose to a cylinder of HFC−410A.
Set for liquid phase charging.
BConnect the manifold gauge set’s low pressure
side to the suction line service port.
CConnect the manifold gauge set’s high
pressure side to the liquid line service port.
DPosition temperature sensor on liquid line near
liquid line service port.
LIQUID PHASE
REFRIGERANT TANK
CHARGE IN
DIGITAL SCALE
System Refrigerant
This section outlines procedures for:
1. Connecting gauge set for testing and charging;
2. Checking and adjusting indoor airflow;
3. Adding or removing refrigerant.
MANIFOLD GAUGE SET
LOW
HIGH
OUTDOOR UNIT
A
506645−01
TEMPERATURE SENSOR
(LIQUID LINE)
TEMPERATURE
D
SENSOR
TO LIQUID
LINE SERVICE
VALV E
C
Figure 18. Manifold Gauge Set Setup and Connections
Page 22
CHECKING AIR FLOW AT INDOOR COIL
Check airflow using the Delta−T (
DT) process using the illustration in figure 19.
Temp.
of air
entering
indoor
coil ºF
A
Wet−bulb ºF
53º
DRY
BULB
80 24 24 24 23 23 22 22 22 20 19 18 17 16 15
78 23 23 23 22 22 21 21 20 19 18 17 16 15 14
76 22 22 22 21 21 20 19 19 18 17 16 15 14 13
74 21 21 21 20 19 19 18 17 16 16 15 14 13 12
Dry−bulb
72 20 20 19 18 17 17 16 15 15 14 13 12 11 10
70 19 19 18 18 17 17 16 15 15 14 13 12 11 10
57 58 59 60 61 62 63 64 65 66 67 68 69 70
T
C
Drop
19º
All temperatures are
expressed in ºF
DT
air flowair flow
INDOOR
COIL
B
B
64º
Figure 19. Checking Indoor Airflow over Evaporator Coil using Delta−T Chart
START: Determine how refrigerant is metered
WET
BULB
A
72º
BULB
DRY
1. Determine the desired DTMeasure entering air temper-
ature using dry bulb (A) and wet bulb (B). DT is the intersecting value of A and B in the table (see triangle).
2. Find temperature drop across coilMeasure the coil’s dry
bulb entering and leaving air temperatures (A and C). Temperature Drop Formula: (T
3. Determine if fan needs adjustmentIf the difference between
the measured T
+
3º, no adjustment is needed. See examples: Assume DT =
and the desired DT (T
Drop
) = A minus C.
Drop
–DT) is within
Drop
15 and A temp. = 72º, these C temperatures would necessitate stated actions:
Cº T
53º 19 – 15 = 4 Increase the airflow
58º 14 – 15 = −1 (within +3º range) no change
62º 10 – 15 = −5 Decrease the airflow
4. Adjust the fan speedSee indoor unit instructions to in-
– DT = ºF ACTION
Drop
crease/decrease fan speed.
Changing air flow affects all temperatures; recheck temperatures to confirm that the temperature drop and DT are within
3º.
+
WHEN TO CHARGE?
Best during warm weather
Can charge in colder weather by determining
best charge method? Determine by:
A Metering device type
B Outdoor ambient temperature
REQUIREMENTS:
Sufficient heat load in structure
Indoor temperature between 70-80ºF (21−26ºC)
Manifold gauge set connected to unit
Thermometers:
− to measure outdoor ambient temperature
− to measure liquid line temperature
− to measure suction line temperature
Figure 20. Determining Charge Method
TXV
65ºF
(18.3ºC) and
Above
APPROACH OR
SUBCOOLING
metering
device?
64ºF
(17.7ºC) and
Below
WEIGH-IN
Which
40ºF
(4.4ºC) and
Above
RFC
39ºF
(3.8ºC) and
Below
WEIGH-INSUPERHEAT
Page 23
14ACX SERIES
WEIGH IN (RFC AND TXV)
CALCULATING SYSTEM CHARGE FOR OUTDOOR UNIT VOID OF CHARGE
If the system is void of refrigerant, first, locate and repair any leaks and then weigh in the refrigerant charge into the
unit. To calculate the total refrigerant charge:
Adjust amount. for variation
Amount specified on
nameplate
in line set length listed on
line set length table below.
Total charge
+
=
Refrigerant Charge per Line Set Length
Liquid Line
Set Diameter
3/8" (9.5 mm)
*If line length is greater than 15 ft. (4.6 m), add this amount. If
line length is less than 15 ft. (4.6 m), subtract this amount.
NOTE Insulate liquid line when it is routed through areas where the surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or greater than 20 psig.
NOTE The above nameplate is for illustration purposes only. Go to actual nameplate on outdoor unit for charge information.
Ounces per 5 feet (g per 1.5 m)
adjust from 15 feet (4.6 m) line set*
3 ounce per 5’ (85 g per 1.5 m)
Figure 21. Using HFC−410A Weigh In Method
USE WEIGH-IN METHOD
Weigh-in or remove refrigerant
based upon line length
(17.7ºC) and
Below
If value is greater than shown (high
approach), add refrigerant; if less
than shown (liquid temperature too
close to ambient temperature, low
approach), remove refrigerant.
APPº (Approach) Values(F:+/−1.0° [C: +/−0.6°])
64ºF
65ºF (18.3ºC)
and Above
ABOVE or
BELOW
If refrigerant is added or
removed, retest to confirm
that unit is properly charged.
1. Confirm proper airflow across coil using figure 19.
2. Compare unit pressures with table 4, Normal Operating
Pressures.
3. Set thermostat to call for heat (must have a cooling load
between 70-80ºF (21−26ºC).
4. Connect gauge set.
5. When heat demand is satisfied, set thermostat to call for
cooling.
6. Allow temperatures and pressures to stabilize.
7. Record outdoor ambient temperature:
AMBº =_________
8. Record liquid line temperature:
LIQº = __________
9. Subtract to determine approach (APPº):
LIQº_____ − AMBº _____ = APPº_____
10. Compare results with table below.
ºF (ºC)* −018 −024 −030 −036 −041 −042 −047 −048 −059/−060
65 (18)
75 (24)
85 (29)
95 (35)
105 (41)
115 (45)
*Temperature of air entering outdoor coil.
4 (2.2) 2 (1.1) 2 (1.1) 2 (1.1) 3 (1.7) 6 (3.3) 9 (5.0) 7 (3.9) 8 (4.4)
5 (2.8) 4 (2.2) 4 (2.2) 5 (2.8) 3 (1.7) 6 (3.3) 9 (5.0) 8 (4.4) 9 (5.0)
6 (3.3) 4 (2.2) 6 (3.3) 8 (4.4) 4 (2.2) 8 (4.4) 8 (4.4) 8 (4.4) 9 (5.0)
5 (2,8) 4 (2.2) 5 (2.8) 7 (3.9) 4 (2.2) 8 (4.4) 8 (4.4) 8 (4.4) 9 (5.0)
3 (1.7) 4 (2.2) 5 (2.8) 6 (3.3) 4 (2.2) 8 (4.4) 8 (4.4) 8 (4.4) 9 (5.0)
3 (1.7) 3 (1.7) 4 (2.2) 6 (3.3) 5 (2.8) 8 (4.4) 8 (4.4) 9 (5.0) 9 (5.0)
Figure 22. HFC−410A Approach TXV Charge
Page 24
506645−01
USE WEIGH-IN METHOD
Weigh-in or remove refrigerant
based upon line length
64ºF (17.7ºC)
and below
BLOCK OUTDOOR COIL: [sometimes necessary with lower
temperatures] Use cardboard or plastic sheet to restrict the
airflow through the outdoor coil to achieve pressures from
325−375 psig (2240−2585 kPa). Higher pressures are needed
to check charge. Block equal sections of air intake panels and
CARDBOARD OR
PLASTIC SHEET
If refrigerant is added or
removed, verify charge using
the Approach Method.
If value is LESS
than shown, add
refrigerant.
move coverings sideways until the liquid pressure is in the
above noted ranges.
MORE or
ABOVE or
BELOW
If value is MORE than shown,
remove refrigerant.
LESS
65ºF (18.3ºC)
and above
1. Confirm proper airflow across coil using figure 19.
2. Compare unit pressures with table 4, Normal
Operating Pressures.
3. Set thermostat to call for heat (must have a cooling load
between 70-80ºF (21−26ºC)
4. Connect gauge set
5. Measure outdoor ambient temperature
6. When heat demand is satisfied, set thermostat to call for
cooling
7. Allow temperatures and pressures to stabilize.
NOTE − If necessary, block outdoor coil to maintain 325
− 375 psig.
8. Record liquid line temperature:
LIQº = ______
9. Measure liquid line pressure and use the value to
determine saturation temperature (see table 3):
SATº = ______
10. Subtract to determine subcooling (SCº):
SATº_____ − LIQº _____ = SCº _____
11. Compare results with table below.
SCº (Subcooling) Values (F:+/−1.0° [C: +/−0.6°])
ºF (ºC)* −018 −024 −030 −036 −041 −042 −047 −048 −059/−060
65 (18)
75 (24)
85 (29)
95 (35)
105 (41)
115 (45)
*Temperature of air entering outdoor coil.
10 (5.6) 10 (5.6) 11 (6.1) 13 (7.2) 9 (5.0) 10 (5.6) 6 (3.3) 8 (4.4) 8 (4.4)
6 (3.3) 7 (3.9) 8 (4.4) 9 (5.0) 7 (3.9) 7 (3.9) 6 (3.3) 8 (4.4) 7 (3.9)
6 (3.3) 8 (4.4) 6 (3.3) 7 (3.9) 7 (3.9) 8 (4.4) 6 (3.3) 8 (4.4) 8 (4.4)
6 (3.3) 9 (5.0) 6 (3.3) 8 (4.4) 7 (3.9) 8 (4.4) 6 (3.3) 8 (4.4) 7 (3.9)
10 (5.6) 9 (5.0) 7 (3.9) 9 (5.0) 7 (3.9) 8 (4.4) 6 (3.3) 8 (4.4) 6 (3.3)
10 (5.6) 10 (5.6) 8 (4.4) 10 (5.6) 6 (3.3) 7 (3.9) 5 (2.8) 7 (3.9) 6 (3.3)
Figure 23. HFC−410A Subcooling TXV Charge
Page 25
14ACX SERIES
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
Weigh-in or remove refrigerant
based upon line length
SUPERHEAT RFC
ºF* 50 52 54 56 58 60 62 64 66 68 70 72 74 76
40 15 18 20 23 26 29 32 34 38 41 43 46 48 51
45 13 16 18 21 24 27 30 33 36 39 41 44 46 49
50 11 14 16 19 22 25 28 31 34 37 39 42 44 47
55 9 12141720232730333638404244
60 7 10121518212427303335384043
65 - 6 10 13 16 19 21 24 27 30 33 36 38 41
70 - - 7 1013161921242730333639
75 - - - 6 9 121518212428313437
80 - - - - 5 8 12 15 18 21 25 28 31 35
85 - - - - - - 8 11 15 19 22 26 30 33
90 - - - - - - 5 9 131620242731
95 - - - - - - - 6 101418222529
100 --------81216212428
If refrigerant is
REMOVED, retest to
confirm that unit is
properly charged.
105 --------5913172226
110 ---------611152025
115 ----------8141824
* Dry−bulb temperature (ºF) of entering outdoor ambient air.
Wet Bulb (air entering indoor coil)
40ºF
(4.4ºC) and
Above
SHº (Superheat) Values (+/−5ºF)
(3.8ºC) and
ABOVE or
BELOW
39ºF
Below
1. Confirm proper airflow across coil using figure 19.
2. Compare unit pressures with table 4, Normal
Operating Pressures.
3. Use SUPERHEAT to correctly charge unit or to
verify the charge is correct.
4. Set thermostat to call for heat (must have a cooling
load between 70-80ºF (21−26ºC)
5. Connect gauge set.
6. When heat demand is satisfied, set thermostat to
call for cooling.
7. Allow temperatures and pressures to stabilize.
8. Measure the suction line pressure and use the use
value to determine saturation temperature (table
3):
SATº =_________
9. Record suction line temperature:
VAPº =_________
10. Subtract to determine superheat (SHº):
VAPº − _____ SATº ______ = SHº______
11. Record the wet bulb temperature (air entering
indoor coil):
WB =_______
12. Record outdoor ambient temperature.
13. Compare results with table to the left.
NOTE − Do not attempt to charge system where a
dash appears, system could be overcharged.
Superheat is taken at suction line service port.
Suction line superheat must never be less than 5ºF
at the suction line service port.
If value is LESS than
shown, then REMOVE
refrigerant.
MORE or
LESS
If value is MORE
than shown, then
ADD refrigerant.
If refrigerant is
ADDED, retest to
confirm that unit is
properly charged.
Figure 24. HFC−410A Superheat RFC Method
Table 3. HFC−410A Temperature Pressure (Psig)
°F °C Psig °F °C Psig
−40 −40.0 11.6 60 15.6 170
−35 −37.2 14.9 65 18.3 185
−30 −34.4 18.5 70 21.1 201
−25 −31.7 22.5 75 23.9 217
−20 −28.9 26.9 80 26.7 235
−15 −26.1 31.7 85 29.4 254
−10 −23.3 36.8 90 32.2 274
−5 −20.6 42.5 95 35.0 295
0 −17.8 48.6 100 37.8 317
5 −15.0 55.2 105 40.6 340
10 −12.2 62.3 110 43.3 365
15 −9.4 70.0 115 46.1 391
20 −6.7 78.3 120 48.9 418
25 −3.9 87.3
30 −1.1 96.8 130 54.4 476
35 1.7 107 135 57.2 507
40 4.4 11 8 140 60.0 539
45 7.2 130
50 10.0 142
55 12.8 155
125 51.7 446
145 62.8 573
150 65.6 608
506645−01
Page 26
Table 4. HFC−410A Normal Operating Pressures (Liquid +10 and Suction +5 psig)
Use this table to perform maintenance checks; it is not a procedure for charging the
system. Minor variations in these pressures may be due to differences in installations.
IMPORTANT
Significant deviations could mean that the system is not properly charged or that a
problem exists with some component in the system.
Model −018 −024 −030 −036 −041 −042 −047 −048 −059/−060
**Temp.
5F (5C)
Expansion Valve (TXV)*
65 (18) 230 / 138 225 / 135 226 / 129 238 / 132 233 / 142 236 / 138 233 / 139 238 / 136 239 / 133
70 (21) 244 / 139 242 / 137 241 / 131 254 / 135 239 / 142 253 / 140 252 / 140 256 / 138 258 / 135
75 (24) 265 / 140 260 / 138 259 / 134 273 / 138 256 / 143 273 / 141 272 / 141 277 / 139 278 / 136
80 (27) 286 / 140 282 / 140 281 / 138 293 / 140 278 / 144 296 / 142 294 / 142 299 / 140 300 / 137
85 (29) 307 / 142 304 / 141 301 / 140 316 / 142 299 / 145 318 / 143 315 / 142 320 / 139 323 / 138
90 (32) 330 / 143 326 / 142 324 / 141 340 / 143 321 / 145 341 / 144 338 / 144 343 / 140 346 / 139
95 (35) 351 / 144 351 / 142 348 / 142 366 / 144 343 / 146 366 / 146 361 / 144 369 / 141 370 / 140
100 (38) 380 / 144 376 / 144 372 / 143 392 / 145 366 / 147 392 / 147 387 / 144 395 / 142 396 / 142
105 (41) 407 / 145 403 / 145 399 / 144 420 / 147 389 / 148 417 / 148 413 / 145 422 / 144 415 / 143
110 (43) 436 / 146 433 / 145 428 / 145 449 / 148 421 / 149 445 / 149 442 / 148 450 / 146 449 / 145
115 (45) 466 / 147 463 / 147 456 / 146 480 / 149 452 / 151 475 / 151 465 / 148 481 / 148 476 / 147
Fixed Orifice (RFC)*
65 (18) 232 / 124 228 / 125 229 / 128 241 / 131 228 / 131 248 / 135 232 / 125 240 / 126 244 / 125
70 (21) 248 / 127 244 / 127 243 / 129 258 / 134 245 / 135 266 / 138 249 / 129 260 / 129 263 / 128
75 (24) 267 / 131 261 / 131 261 / 132 277 / 136 263 / 138 285 / 141 268 / 133 281 / 133 281 / 131
80 (27) 286 / 135 284 / 134 284 / 135 298 / 139 284 / 141 305 / 143 286 / 136 301 / 135 303 / 134
85 (29) 307 / 138 303 / 137 305 / 138 321 / 141 306 / 144 327 / 145 312 / 140 324 / 138 324 / 136
90 (32) 328 / 141 325 / 140 327 / 140 342 / 143 327 / 146 349 / 147 332 / 142 346 / 140 347 / 139
95 (35) 351 / 143 347 / 142 349 / 142 366 / 145 348 / 148 372 / 149 357 / 144 371 / 142 370 / 141
100 (38) 375 / 146 370 / 144 372 / 144 392 / 147 372 / 149 396 / 150 379 / 146 395 / 144 394 / 143
105 (41) 400 / 148 394 / 146 396 / 146 416 / 149 395 / 151 421 / 152 406 / 149 420 / 146 418 / 145
110 (43) 426 / 150 420 / 148 422 / 148 446 / 151 424 /153 447 / 153 430 / 150 447 / 148 444 / 146
115 (46) 457 / 153 447 / 150 449 / 150 480 / 152 453 / 155 476 / 154 460 / 152 473 / 150 471 / 147
*Values shown are typical pressures; indoor unit match up, indoor air quality equipment, and indoor load will cause the pressures to vary.
**Temperature of the air entering the outside coil.
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Liquid /
Suction
Page 27
14ACX SERIES
System Operation
UNIT COMPONENTS
IMPORTANT
Some scroll compressor have internal vacuum protector
that will unload scrolls when suction pressure 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 COMPRESSOR.
High Pressure Switch (S4)
14ACX units are equipped with a high-pressure switch that
is located in the liquid line of the compressor as illustrated
in figure on page 2 and figure 25 for the location of the
manual reset button..
MANUAL RESET
BUTTON
Figure 25. High Pressure Switch (S4) Manual Reset
The switch is a Single Pole, Single Throw (SPST),
manual−reset switch which is normally closed and
removes power from the compressor when discharge
pressure rises above factory setting at 590 + 10 psi. The
manual−reset button can be identified by a red cap that is
press to preform the reset function.
Thermal Protection Switch (S173) Compressor
Mounted
Some units are equipped with a compressor mounted
normally closed temperature switch that prevents
compressor damage due to overheating caused by
internal friction. The switch is located on top of the
compressor casing (see figure 1). This switch senses the
compressor casing temperature and opens at 239−257°F
(115°C−125°C) to shut off compressor operation. The
auto−reset switch closes when the compressor casing
temperature falls to 151−187°F (66°C−86°C), and the
compressor is re−energized. This single−pole, single−throw
(SPST) bi−metallic switch is wired in series with the 24V Y
input signal to control compressor operation.
Crankcase Heater (HR1) and Thermostat Switch
(S40) (−041 through −060 models only)
These models are equipped with either a 40 or 70 watt
belly−band type crankcase heater. HR1 prevents liquid
from accumulating in the compressor. HR1 is controlled by
a single−pole, single−throw thermostat (SPST) switch
(S40) located on the liquid line (see figure 1 for location).
When liquid line temperature drops below 50°F the
thermostat closes energizing HR1. The thermostat will
open, de−energizing HR1 once liquid line temperature
reaches 70° F.
Maintenance
DEALER
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:
Outdoor Unit
1. Outdoor unit fan motor is pre−lubricated and sealed.
No further lubrication is needed.
2. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
3. Check all wiring for loose connections.
4. Check for correct voltage at unit (unit operating).
5. Check amp draw on outdoor fan motor.
Motor Nameplate:_________ Actual:__________.
6. Inspect drain holes in coil compartment base and
clean if necessary.
NOTE - If insufficient cooling occurs, the unit should be
gauged and refrigerant charge should be checked.
Outdoor Coil
Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
NOTE It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which are
corrosive or which block airflow across the coil (e.g., pet
urine, cottonwood seeds, fertilizers, fluids that may contain
high levels of corrosive chemicals such as salts)
Sea Coast Moist air in ocean locations can carry salt,
which is corrosive to most metal. Units that are located
near the ocean require frequent inspections and
maintenance. These inspections will determine the
necessary need to wash the unit including the outdoor coil.
Consult your installing contractor for proper
intervals/procedures for your geographic area or service
contract.
506645−01
Page 28
Indoor Unit
1. Clean or change filters.
2. Lennox 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.
Motor Nameplate:_________ Actual:__________.
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.
HOMEOWNER
Cleaning of the outdoor unit’s coil should be performed by
a trained service technician. 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.
IMPORTANT
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure of the
unit to treated water (i.e., sprinkler systems, soakers,
waste water, etc.) will corrode the surface of steel and
aluminum parts and diminish performance and longevity
of the unit.
Outdoor Coil
The outdoor unit must be properly maintained to ensure its
proper operation.
Please contact your dealer to schedule proper
inspection and maintenance for your equipment.
Make sure no obstructions restrict airflow to the
outdoor unit.
Grass clippings, leaves, or shrubs crowding the unit
can cause the unit to work harder and use more
energy.
Keep shrubbery trimmed away from the unit and
periodically check for debris which collects around the
unit.
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.
1. Air Filter Ask your Lennox dealer to show you
where your indoor unit’s filter is located. It will be either
at the indoor unit (installed internal or external to the
cabinet) or behind a return air grille in the wall or
ceiling. Check the filter monthly and clean or replace
it as needed.
2. Disposable Filter Disposable filters should be
replaced with a filter of the same type and size.
NOTE If you are unsure about the filter required for your
system, call your Lennox dealer for assistance.
3. Reusable Filter Many indoor units are equipped
with reusable foam filters. Clean foam filters with a
mild soap and water solution; rinse thoroughly; allow
filter to dry completely before returning it to the unit or
grille.
NOTE The filter and all access panels must be in place
any time the unit is in operation.
4. Indoor Unit The indoor unit’s 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.)
Thermostat Operation
See the thermostat homeowner manual for instructions on
how to operate your thermostat.
Preservice Check
If your system fails to operate, check the following before
calling for service:
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.
Verify air filter is clean.
If service is needed, locate and write down the unit
model number and have it handy before calling.
Accessories
For update−to−date information, see any of the following
publications:
Lennox 14ACX Engineering Handbook
Lennox Product Catalog
Lennox Price Book
Page 29
14ACX SERIES
Start−Up and Performance Checklist
Job Name Job no. Date
Job Location City State
Installer City State
Unit Model No. Serial No. Service Technician
Nameplate Voltage
Rated Load Ampacity Compressor Outdoor Fan
Maximum Fuse or Circuit Breaker
Electrical Connections Tight? Indoor Filter clean? Supply Voltage (Unit Off)
Indoor Blower RPM S.P. Drop Over Indoor (Dry) Outdoor Coil Entering Air Temp.
Discharge Pressure Suction Pressure Refrigerant Charge Checked?
Refrigerant Lines: Leak Checked? Properly Insulated? Outdoor Fan Checked?
Service Valves: Fully Opened? Caps Tight? Thermostat
Voltage With Compressor Operating Calibrated? Properly Set? Level?
506645−01
Page 30
Loading...