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Page 9

New or Replacement Line Set

This section provides information on new installation or re-

placement of existing line set. If a new or replacement line 

set is not required, then proceed to Brazing Connections 

on page 11. 
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 refrig

-

erant lines will not create unnecessary vibration and sub-

sequent sounds. 

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 – in. (mm)

Model

Field

Connections

Recommended Line Set

Liquid

Line

Vapor

Line

Liquid

Line

Vapor

Line

L15

Line Sets

-024

3/8 in.

(10 mm)

3/4 in

(19 mm)

3/8 in.

(10

mm)

3/4 in

(19

mm)

L15-41

15 ft. - 50 ft.

(4.6 m - 15

m)

-036

-048

3/8 in.

(10 mm)

7/8 in

(22 mm)

3/8 in.

(10

mm)

7/8 in

(22

mm)

L15-65

15 ft. - 50 ft.

(4.6 m - 15

m)

-060

3/8 in.

(10 mm)

7/8 in.

(22 mm)

3/8 in.

(10

mm)

7/8 in.

(22

mm)

Field

Fabricated

NOTE — Some applications may require a field provided 7/8” to

1-1/8” adapter

NOTE

 – 

When installing refrigerant lines longer than 50 

feet, contact Lennox Technical Support Product Applica-

tions for assistance or Lennox piping manual. To obtain 

the correct information from Lennox, be sure to communi-

cate the following points

:  

• 

Model (16ACX) and size of unit (e.g. -060).  

• 

 Line set diameters for the unit being installed as listed in 

table 4 and total length of installation.  

•   Number of elbows and if there is a rise or drop of the 

piping.

 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 for every five pounds of refrigerant. 

Recommended topping-off POE oils are Mobil EAL ARC

-

TIC 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. Refrig-

erant  was  metered  into  the  evaporator  by  utilizing  tem

-

perature/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 16ACX 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 16ACX unit. Typically a liquid line used 

to meter flow is 1/4” in diameter and copper. 

LINE SET ISOLATION

 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

The Clean Air Act of 1990 bans the intentional venting 

of refrigerant (CFC’s and HCFC’s) as of July 1, 1992. 

Approved methods of recovery, recycling or reclaiming 

must be followed. Fines and/or incarceration may be 

levied for non-compliance.

 IMPORTANT

If this unit is being matched with an approved line set 

or indoor unit coil that was previously charged with 

mineral oil, or if it is being matched with a coil which 

was manufactured before January of 1999, the coil and 

line set must be flushed prior to installation. Take care to 

empty all existing traps. Polyol ester (POE) oils are used 

in  Lennox  units  charged  with  HFC-410A  refrigerant. 

Residual mineral oil can act as an insulator, preventing 

proper  heat  transfer.  It  can  also  clog  the  expansion 

device and reduce system performance and capacity.

Failure to properly flush the system, per this instruction 

and  the  detailed  Installation  and  Service  Procedures 

manual will void the warranty.

Summary of Contents for 16ACX Series

Page 1: ...isconnect all remote electric power supplies before opening access panel Unit may have multiple power supplies 16ACX Table of Contents Installation Clearances 2 Model Number Identification 2 Dimension...

Page 2: ...mm Clearance to one of the remaining two sides may be A clearance of 24 in must be maintained between two units 48 in 1219 mm clearance required on top of unit Model Number Identification 16 AC X 036...

Page 3: ...NECTION 6 3 8 162 TOP VIEW BASE SECTION COMPRESSOR COIL DRAIN OUTLETS Around perimeter of base OPTIONAL UNIT STAND OFF KIT 4 Field Installed 111 4 3 8 4 3 8 4 3 8 4 3 8 6 3 8 162 111 111 111 111 4 3 8...

Page 4: ...0 97 0 95 Outdoor Fan Motor Full load amps 1 0 1 7 1 7 1 4 Locked Rotor amps 1 9 3 2 3 2 3 2 CONTROLS ORDER SEPARATELY iComfort M30 Smart Wi Fi Thermostat 15Z69 Remote Outdoor Temperature Sensor X265...

Page 5: ...riately sized wrench should be used and fitted snugly over the cap before tightening TABLE 1 Torque Requirements Parts Recommended Torque Service valve cap 8 ft lb 11 NM Sheet metal screws 16 ft lb 2...

Page 6: ...7 8 9 10 11 12 1 12 TURN 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...

Page 7: ...ent of unit in relation to a window see the provided illustration in figure 3 detail A PLACING UNIT ON SLAB When installing unit at grade level the top of the slab should be high enough above grade so...

Page 8: ...ons that may cause panels to be blown around and battered WARNING REMOVAL STEP 1 INSERT PANEL UNDER UNIT TOP CAP LIP AND LIFT SLIGHTLY TO CLEAR SIDE LIP OF PANEL FROM BASE STEP 2 PANEL INSTALLATION TO...

Page 9: ...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 for every five pounds of refrigerant Recommended topping...

Page 10: ...be used if line set is to be installed on exterior of outside wall PVC PIPE FIBERGLASS INSULATION CAULK OUTSIDE WALL VAPOR LINE WRAPPED WITH ARMAFLEX LIQUID LINE OUTSIDE WALL LIQUID LINE VAPOR LINE WO...

Page 11: ...dous 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...

Page 12: ...SERVICE VALVE 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 CUT AND D...

Page 13: ...tions for the next step in preparing the unit WHEN BRAZING LINE SET TO SERVICE VALVES POINT FLAME AWAY FROM SERVICE VALVE PREPARATION FOR NEXT STEP 7 WARNING 1 FIRE PERSONAL INJURY OR PROPERTY DAMAGE...

Page 14: ...ISTING INDOOR UNIT GAUGE MANIFOLD INVERTED CYLINDER CONTAINS CLEAN HCFC22 TO BE USED FOR FLUSHING LIQUID LINE SERVICE VALVE INLET DISCHARGE TANK RETURN CLOSED OPENED RECOVERY CYLINDER RECOVERY MACHINE...

Page 15: ...hreads and expose surface of the Teflon ring with refrigerantoil E Attach the liquid line assembly to the expansion valve Finger tighten and use an appropriately sized wrench to turn an additional 1 2...

Page 16: ...losed 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 allo...

Page 17: ...r 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...

Page 18: ...to unit nameplate for minimum circuit ampacity and maximum overcurrent protection size 24VAC TRANSFORMER Use the transformer provided with the furnace or air han dler for low voltage control power 24...

Page 19: ...Page 19 FIGURE 12 Typical Wiring Diagram...

Page 20: ...shut off compressor operation The auto reset switch closes when the compressor cas ing temperature falls to 151 187 F 66 C 86 C and the compressor is re energized This single pole single throw SPST bi...

Page 21: ...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 repla...

Page 22: ...he 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 with...

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