International Comfort Products N4A3, NXA4, N4A5, N4A6, R4A3 Installation Manual

INSTALLATION INSTRUCTIONS

R--410A Split System Air Conditioners

N4A3, NXA4, N4A5, N4A6, NXA6 / R4A3, R4A4, R4A5 / WCA3, WCA4, WCA5

These instructions must be read and understood completely before attempting installation.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes and
current editions of the National Electrical Code (NEC) NFPA 70.
In Canada, refer to current editions of the Canadian electrical code
CSA 22.1.

Recognize safety information. This is the safety--alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury. Understand
these signal words; DANGER, WARNING, and CAUTION. Th ese
words are u sed with the safety-- alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury
or death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify unsafe
practices which would result in minor personal injury or product
and property damage. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or operation.

!

ELECTRICAL SHOCK HAZARD

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

Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.

WARNING

GENERAL

NOTE: In some cases noise in the living area has been traced to

gas pulsations from improper installation of equipment.

1. Locate unit away from windows, patios, decks, etc. where
unit operation sound may disturb customer.

2. Ensure that vapor and liquid tube diameters are appropriate
for unit capacity.

3. Run refrigerant tubes as directly as possible by avoiding un­necessary turns and bends.

4. Leave some slack between structure and unit to absorb vi­bration.

5. When passing refrigerant tubes through the wall, seal open­ing with RTV or other pliable silicon--based caulk. (See Fig.

1.)

6. Avoid direct tubing contact with water pipes, duct work,
floor joists, wall studs, floors, and walls.

!

!

7. Do not suspend refrigerant tubing from joists and studs with
a rigid wire or strap which comes in direct contact with
tubing.(See Fig. 1.)

8. Ensure that tubing insulation is pliable and completely sur­rounds vapor tube.

9. When necessary, use hanger straps which are 1 in. (25.4
mm) wide and conform to shape of tubing insulation. (See
Fig. 1.)

10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.

Avoid contact between tubing and structureNOTE:

OUTDOOR WALL

CAULK

INSULATION

THROUGH THE WALL

HANGER STRAP

(AROUND VAPOR

TUBE ONLY)

INDOOR WALL

LIQUID TUBE

VAPOR TUBE

JOIST

INSULATION

VAPOR TUBE

!

WARNING

EXPLOSION HAZARD

Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.

Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

1” (25.4 mm) MIN.

SUSPENSION

Fig. 1 -- Piping Installation

LIQUID TUBE

A94026

Catalog No: 42101550100

Replaces: New

For proper unit operation, check refrigerant charge using charging
information located on control box cover and/or in the Check
Charge section of this instruction.

IMPORTANT: Maximum liquid--line size is 3/8--in. OD for all
residential applications including long line. Refer to Residential
Piping and Longline Guideline for further information.

IMPORTANT: Always install the factory--supplied liquid--line
filter drier. If replacing the filter drier, refer to Product Data Digest
for appropriate part number . Obtain replacement filter driers from
your distributor or branch.

INSTALLATION

IMPORTANT: Effective January 1, 2015, all split system air
conditioners and heat pumps must be installed pursuant to the
regional efficiency standards issued by the Department of
Energy.

!

CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when
handling parts.

Check Equipment and Job Site

UNPACK UNIT
Move to final location. Remove carton taking care not to damage

unit.

Inspect Equipment

File claim with shipping company prior to installation if shipment
is damaged or incomplete. Locate unit rating plate on unit corner
panel. It contains information needed to properly install unit.
Check rating plate to be sure unit matches job specifications.

Install on a Solid, Level Mounting Pad

If conditions or local codes require the unit be attached to pad, tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig. 2
to determine base pan size and knockout hole location.

For hurricane tie downs, contact local distributor for details and PE
(Professional Engineer) certification, if required by local
authorities.

On rooftop applications, mount on level platform or frame. Place
unit above a load--bearing wall and isolate unit and tubing set from
structure. Arrange supporting members to adequately support unit
and minimize transmission of vibration to building. Consult local
codes governing rooftop applications.

Roof mounted units exposed to winds may require wind baffles.
Consult the Application Guideline and Service Manual -­Residential Split System Air Conditioners and Heat Pumps for
wind baffle construction.

NOTE: Unit must be level to within 2_ (3/8 in./ft ,.9.5 mm/m)
per compressor manufacturer specifications.

Clearance Requirements

When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 24 in. (609.6 mm)
clearance to service end of unit and 48 in. (1219.2 mm) (above
unit. For proper airflow, a 6--in. (152.4 mm) clearance on 1 side of
unit and 12-- in. (304.8 mm) on all remaining sides must be
maintained. Maintain a distance of 24 in. (609.6 mm) between
units or 18 in. (457.2 mm) if no overhang within 12 ft. (3.66 m)
Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.

NOTE: 18” (457.2 mm) clearance option described above is
approved for outdoor units with wire grille coil guard only.
Units with louver panels require 24” (609.6 mm) between units.

On rooftop applications, locate unit at least 6 in. (152.4 mm) above
roof surface.

Operating Ambient

The minimum outdoor operating ambient in cooling mode without
accessory is 55 _F (12.78 _C), and the maximum outdoor
operating ambient in cooling mode is 125_F (51.67 _C).

Make Piping Connections

!

PERSONAL INJURY AND ENVIRONMENTAL
HAZARD

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

Relieve pressure and recover all refrigerant before system
repair or final unit disposal. Use all service ports and open all
flow--control devices, including solenoid valves.

Federal regulations require that you do not vent refrigerant to
the atmosphere. Recover during system repair or final unit
disposal.

!

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

If ANY refrigerant tubing is buried, provide a 6--in (152.4
mm). vertical rise at service valve. Refrigerant tubing
lengths up to 36-- in (914.4 mm). may be buried without
further special consideration. Do not bury lines more than
36-- in. (914.4 mm).

UNIT BASE PAN

Dimension in. (mm)

23---1/2 X 23 ---1/2

(596.9 X 596.9)

26 X 26

(660.4 X 660.4)

31–1/2 X 31–1/2

(800.1 X 800.1)

35 X 35

(889 X 889)

Fig. 2 -- Tiedown Knockout Locations

Outdoor units may be connected to indoor section using accessory
tubing package or field--supplied refrigerant grade tubing of correct
size and condition. Rated tubing diameters shown in Table 1 are
recommended up to 80 ft. (24.38 m). See Product Data for
acceptable alternate vapor diameters and associated capacity losses.
For tubing requirements beyond 80 ft. (24.38 m), substantial

WARNING

CAUTION

3/8--- in. (9.53 mm) Dia.
Tiedown Knockouts in
Basepan(2) Places

View From Top

TIEDOWN KNOCKOUT LOCATIONS in. (mm)

A B C

7---13/16 (198.4) 4–7/16 (112.7) 18–1/16 (458.8)

9–1/8 (231.8) 4–7/16 (112.7) 21–1/4 (539.8)

9–1/8 (231.8) 6–9/16 (166.7) 24–11/16 (627.1)

9–1/8 (231.8) 6–9/16 (166.7) 28–7/16 (722.3)

A05177

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

2

Catalog No: 42101550100

Replaces: New

capacity and performance losses can occur. Following the

T

recommendations in the Longline Guideline will reduce these
losses. Refer to Table 1 for field tubing diameters. Refer to Table 5
for accessory requirements.

There are no buried--line applications greater than 36--in. (914.4
mm) allowed.

If refrigerant tubes or indoor coil are exposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination and
moisture in the system.

Outdoor Unit Connected to F actory Approved Indoor
Unit

Outdoor unit contains correct system refrigerant charge for
operation with factory approved AHRI rated indoor unit when
connected by 15 ft. (4.57 m) of field--supplied or factory--accessory
tubing, and factory supplied filter drier. Check refrigerant charge
for maximum efficiency.

NOTE: Some units may require additional charge amounts for 15
ft (4.57 m) line sets. Refer to the chart in the Check Charge section
for further instructions.

Refrigerant Tubing Connection Outdoor

Connect vapor and liquid tubes to fittings on vapor and liquid
service valves (see Table 1.) Use refrigerant grade tubing

Sweat Connection

Install Liquid--Line Filter Drier Indoor

!

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

1. Installation of filter drier in liquid line is required.

2. Filter drier must be wrapped in a heat--sinking material

such as a wet cloth while brazing.

Refer to Fig. 3 and install filter drier as follows:

1. Braze 5--in. liquid tube to the indoor coil.

2. Wrap filter drier with damp cloth.

3. Braze filter drier to above 5--in. (127 mm) liquid tube.
Flow arrow must point towards indoor coil.

4. Connect and braze liquid refrigerant tube to the filter drier.

CAUTION

!

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

Service valves must be wrapped in a heat--sinking material
such as a wet cloth while brazing.

Use refrigeration grade tubing. Service valves are closed from
factory and ready for brazing. After wrapping service valve with a
wet cloth, braze sweat connections using industry accepted
methods and materials. Consult local code requirements.
Refrigerant tubing and indoor coil are now ready for leak testing.
This check should include all field and factory joints.

Table 1 – Refrigerant Connections and Recommended Liquid

and Vapor Tube Diameters (In.)

LIQUID RATED VAPOR*

UNIT SIZE

18, 24 3/8 3/4 3/4

30 3/8 3/4 3/4
36 3/8 7/8 7/8

42, 48 3/8 7/8 7/8

60 3/8 7/8 1 --- 1 / 8

* Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for

performance data when using different size and length linesets.

Notes:

1. Do not apply capillary tube or fixed orifice indoor coils to these units.

2. For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m)
horizontal or 35 ft. (10.7 m) vertical differential 250 ft. (76.2 m) Total
Equivalent Length), refer to the Residential Piping and Longline Guide
line--- Air Conditioners an d Heat Pumps using R --- 410A refr igerant.

3. For alternate liquid line options on 18--- 42 size units, see Product Data or
Residential Piping and Application Guidel ine

Connection

&Max.Tube

Diameter

Connection

Diameter

Tub e

Diameter

A05178

Fig. 3 -- Liquid Line Filter Drier

Evacuate Refrigerant Tubing and Indoor Coil

!

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

Never use the system compressor as a vacuum pump.

Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used (see triple evacuation
procedure in service manual). Always break a vacuum with dry
nitrogen.

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most positive way of assuring a system is free of air and
liquid water. A tight dry system will hold a vacuum of 1000
microns after approximately 7 minutes. See Fig. 4.

5000
4500
4000
3500
3000
2500

MICRONS

2000
1500
1000

500

01234567

MINUTES

Fig. 4 -- Deep Vacuum Graph

LEAK IN
SYSTEM

VACUUM TIGH
TOO WET

TIGHT
DRY SYSTEM

A95424

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

3

Catalog No: 42101550100

Replaces: New