Lennox 506945-01 User Manual

INSTALLATION

E2013 Lennox Industries Inc.

Dallas, Texas, USA

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

WARNING

The State of California has determined that this product may contain or produce a chemical or chemicals, in very low doses, which may cause serious illness or death. It may also cause cancer, birth defects, or reproductive harm.

GENERAL

This 13ACX outdoor unit is designed for use with HFC-410A refrigerant only. This unit must be installed with an approved indoor unit. See the Lennox 13ACX Product Specifications bulletin (EHB) for approved indoor component match ups.

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

INSTRUCTIONS

Merit® Series 13ACX Units

AIR CONDITIONER 506945-01

5/2013 Supersedes 7/2012

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.

CAUTION

Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch.

CAUTION

As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment.

Litho U.S.A.

STEP 1 -- SETTING THE UNIT -- Clearances

CLEARANCE ON ALL SIDES — INCHES (MILLIMETERS)

6 (152)

NOTES:

S Clearance to one of the other three

12 (305)

30 (762)

sides must be 36 inches (914mm).

S Clearance to one of the remaining

two sides may be 12 inches (305mm) and the final side may be 6 inches (152mm).

36 (914)

MINIMUM CLEARANCE BETWEEN TWO UNITS

7/2012 506945-01

LINE SET CONNECTIONS

24 (610)

FIGURE 1

Page 1

ACCESS

LINE SET

CONNECTIONS

MINIMUM CLEARANCE

ABOVE UNIT

48 (1219)

PANEL

*2P72012* *P506945-01*

UNIT DIMENSIONS - INCHES (MM)

SIDE VIEW

FIGURE 2

TABLE 1

UNIT DIMENSIONS

Model Numbers A B

13ACX-018-230 24-1/4 (616) 25-1/4 (641)

13ACX-024-230 24-1/4 (616) 25-1/4 (641)

13ACX-030-230 24-1/4 (616) 29-1/4 (743)

13ACX-036-230 24-1/4 (616) 29-1/4 (743)

13ACX-042-230 28-1/4 (718) 29-1/4 (743)

13ACX-048-230 28-1/4 (718) 33-1/4 (845)

13ACX-060-230 28-1/4 (718) 29-1/4 (743)

IMPORTANT !

This model is designed for use in check / expansion valve systems only. An indoor expansion valve ap proved for use with HFC-410A refrigerant must be or dered separately and installed prior to operating the system.

IMPORTANT !

Exhaust vents from dryers, water heaters and furnaces should be directed away from the outdoor unit. Pro longed exposure to exhaust gases and the chemicals contained within them may cause condensation to form on the steel cabinet and other metal components of the outdoor unit. This will diminish unit performance and longevity.

PLACEMENT

INSTALL UNIT AWAY

FROM WINDOWS

STEP 1 -- SETTING THE UNIT (CONTIN UED) -- Unit Placement

WARNING

To prevent personal injury, as well as damage to panels, unit or structure, observe the following:

While installing or servicing this unit, carefully stow all removed panels so that the panels will not cause injury to personnel, objects or nearby structures. Also, take care to store panels where they will not be subject to damage (e.g., being bent or scratched).

While handling or stowing the panels, consider any weather conditions (especially wind) that may cause panels to be blown around and damaged.

NOTICE !

Roof Damage! This system contains both refrigerant and oil. Some

rubber roofing material may absorb oil, causing the rubber to degrade. Failure to follow this notice could result in damage to roof surface.

TWO 90_ ELBOWS INSTALLED IN LINE SET

WILL REDUCE LINE SET VIBRATION

FIGURE 3

SLAB MOUNTING

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

DISCHARGE AIR

MOUNTING SLAB

GROUND LEVEL

FIGURE 4

Page 2

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

ROOF RAFTER

FIGURE 5

Page 3

13ACX SERIES

STEP 2 -- REFRIGERANT PIPING -- Flushing Existing Line Set and Indoor Coil

Flush the existing line set per the following instructions. For more information, refer to the Installation and Service Procedures manual available on DaveNet. CAUTION - DO NOT attempt to flush and re-use existing line sets or indoor coil when the system contains contaminants (i.e., compressor burn out).

NOTE - When installing refrigerant lines longer than 50 feet, refer to the Refrigerant Piping Design and Fabrication Guidelines manual available on DaveNet (Corp. 9351-L9), or contact the Technical Support Department Product Application group for assistance.

IMPORTANT !

If this unit is being matched with an approved line set or indoor unit coil that was previously charged with mineral oil, or if it is being matched with a coil which was manufactured before January of 1999, the coil and line set must be flushed prior to installation. Take care to empty all existing traps. Polyol ester (POE) oils are used in Lennox units charged with HFC-410A refrigerant. Residual mineral oil can act as an insula tor, preventing proper heat transfer. It can also clog the expansion device and reduce system perfor mance and capacity.

Failure to properly flush the system per this instruc tion and the detailed Installation and Service Proce dures manual will void the warranty.

WARNING

When using a high pressure gas such as nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).

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.

Some scroll compressors have an internal vacuum protector that will unload scrolls when suction pres sure goes below 20 psig. A hissing sound will be heard when the compressor is running unloaded. Protector will reset when low pressure in system is raised above 40 psig. DO NOT REPLACE COMPRES SOR.

LIQUID LINE FILTER DRIER INSTALLATION

The filter drier (one is shipped with each 13ACX unit) must be field installed in the liquid line between the outdoor unit's liquid line service valve and the indoor coil's metering device (fixed orifice or TXV) as illustrated in figure 6. 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 7 for special procedures on brazing filter drier connections to the liquid line.

Typical Liquid Line Filter Drier Installation

WARNING

IMPORTANT !

BRAZE CONNECTION POINTS

WARNING

Refrigerant can be harmful if it is inhaled. Refrigerant must be used and recovered responsibly.

Failure to follow this warning may result in personal injury or death.

TABLE 2

REFRIGERANT LINE SET — INCHES (MM)

Model Number (-xx*)

13ACX-018-230 13ACX-024-230

13ACX-030-230 13ACX-036-230 13ACX-042-230

13ACX-048-230 13ACX-060-230

* Applicable to all minor revision numbers unless otherwise specified. ** Some applications may required a field-provided 1-1/8” to 7/8” adapter.

Liquid Line Suction Line L15 Line Set Model Line Set Length Catalog Number

3/8” (10 mm) 5/8“ (16 mm)

3/8” (10 mm) 3/4” (19 mm)

3/8” (10 mm) 7/8” (22 mm)

Valve Size Connections Recommended Line Sets

OUTDOOR

UNIT

LIQUID LINE

SERVICE VALVE

LINE

LIQUID LINE

FILTER DRIER

FIGURE 6

L15-26-20 20 feet (6.1 m) 89J52

L15-26-25 25 feet (9.1 m) 89J53

L15-26-35 35 feet (12.2 m) 89J54

L15-26-50 50 feet (15.2 m) 89J55

L15-41-20 20 feet (6.1 m) 89J56

L15-41-30 30 feet (9.1 m) 89J57

L15-41-40 40 feet (12.2 m) 89J58

L15-41-50 50 feet (15.2 m) 89J59

L15-65-30 30 feet (9.1 m) 89J60

L15-65-40 40 feet (12.2 m) 89J61

L15-65-50 50 feet (15.2 m) 89J62

LIQUID

LINE

Page 4

STEP 2 -- REFRIGERANT PIPING -- Removing Existing Indoor Metering Device

TYPICAL EXISTING FIXED ORIFICE

DISTRIBUTOR

ASSEMBLY

A On fully cased coils, remove the coil access and plumbing panels. B Remove any shipping clamps from 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 pro cess.

D Remove and discard fixed orifice, valve stem assembly (if present)

and Teflon® washer as illustrated above.

E Use a field-provided fitting to temporarily reconnect the liquid line to the

indoor unit's liquid line orifice housing.

(UNCASED COIL SHOWN)

DISTRIBUTOR TUBES

LIQUID LINE ORIFICE HOUSING

TEFLON® RING

FIXED ORIFICE

REMOVE AND DISCARD

WHITE TEFLON

(IF PRESENT)

SEAL

LIQUID LINE ASSEMBLY

(INCLUDES STRAINER)

REMOVAL PROCEDURE

BRASS NUT

TWO-PIECE PATCH PLATE

CONNECT GAUGES AND EQUIPMENT FOR FLUSHING PROCEDURE

CYLINDER CONTAINING CLEAN HCFC-22 TO BE USED FOR FLUSHING (Positioned to deliver liquid

refrigerant)

VAPOR LINE

SERVICE VALVE

EXISTING

INDOOR

UNIT

LIQUID LINE SERVICE

VALV E

RECOVERY

CYLINDER

VAPOR

LIQUID

OUTDOOR

NEW

UNIT

OPENED

RECOVERY MACHINE

A HCFC-22 cylinder with clean refrigerant (positioned to deliver liquid

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 connected to the gauge set.

D Connect recovery tank to recovery machine per machine instructions.

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

EXPANSION

VALV E

LIQUID LINE

ASSEMBLY WITH

BRASS NUT

LINE

TEFLON

(UNCASED COIL ONLY)

DISTRIBUTOR

TUBES

DISTRIBUTOR

ASSEMBLY

MALE EQUALIZER

LINE FITTING

A On fully cased coils, remove the coil access and plumbing panels. B Remove any shipping clamps from the liquid line and distributor

assembly.

C Disconnect the equalizer line from the expansion valve equalizer

line fitting on the vapor line.

D Remove the vapor line sensing bulb. E Disconnect the liquid line from the expansion valve at the liquid line

assembly.

F Disconnect the expansion valve from the liquid line orifice housing.

Take care not to twist or damage distributor tubes during this process.

G Remove and discard expansion valve and the two Teflon® rings. H Use a field-provided fitting to temporarily reconnect the liquid line

to the indoor unit's liquid line orifice housing.

LIQUID LINE

SENSING BULB

FLUSHING LINE SET

The line set and indoor unit coil must be flushed with at least the 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 Position the cylinder of clean HCFC-22 for delivery of liquid

refrigerant and open its valve to allow liquid refrigerant to flow into the system through the vapor line valve. Allow the refrigerant to pass from the cylinder and through the line set and the indoor unit coil before it enters the recovery machine.

C After all of the liquid refrigerant has been recovered, switch the

recovery machine to vapor recovery so that all of the HCFC-22 vapor is recovered. Allow the recovery machine to pull the system down to 0.

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.

RING

SENSING

LINE

LIQUID

LINE

FIGURE 7

Page 5

13ACX SERIES

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