International Comfort Products NXA6 Installation Manual
INSTALLATION INSTRUCTIONS
R- 410A Split System Air Conditioners
NXA6, N4A6, N4A5, R4A5, WCA5, NXA4,
N4A4, R4A4, WCA4, N4A3, R4A3, WCA3
These instructions must be read and understood completely before attempting installation.
IMPORTANT: Effective January 1, 2015, all split system and packaged air conditioners must be installed pursuant to
applicable regional efficiency standards issued by the Department of Energy.
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 k its 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. These words are used 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
!
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.
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 v ibration.
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.
Specifications subject to change without notice.
421 01 5501 04 10/24/16
Avoid contact between tubing and structureNOTE:
OUTDOOR WALL
CAULK
INSULATION
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
1” (25.4 mm) MIN.
Fig. 1 - Piping Installation
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 Long
Line Application Guideline for further information.
IMPORTANT: Always install the factory- supplied liquid- line
filter drier. If replacing the filter drier, refer to Specification
Sheets for appropriate part number. Obtain replacement filter
driers from your distributor or branch.
INDOOR WALL
SUSPENSION
LIQUID TUBE
VAPOR TUBE
JOIST
INSULATION
VAPOR TUBE
LIQUID TUBE
A94026
INSTALLATION
!
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 c onstruction.
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). The maximum outdoor
operating ambient in cooling mode is 125_F (51.7_C) for
non- 13 SEER models and 115_F (46.11_C) for 13 SEER
models.
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).
WARNING
CAUTION
2 421 01 5501 04
Specifications subject to change without notice.
3/8- in. (9.53 mm) Dia.
Tiedown Knockouts i n
Basepan(2) Places
View From Top
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)
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
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 Specification Sheets for acceptable alternate vapor
diameters and associated capacity losses. For tubing
requirements beyond 80 ft. (24.38 m), substantial capacity
and performance losses can occur. Following the
recommendations in the Long Line Application Guideline
will reduce these losses. Refer to Table 1 for field tubing
diameters. Refer to Table 6 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 Factory Approved
Indoor
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.
Unit
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
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.
Table1–RefrigerantConnections 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 Specification sheet for
performance data when using different size and length linesets.
Notes:
1. Do not apply capillary tube coils to these units.
2. For Tubing Set lengths between 80 and 200 ft. (15.2 and 61.0 m)
horizontal or 35 ft. (10.7 m) vertical differential 250 ft. (76.2 m) Total
Equivalent Length), refer to the Long Line Application Guideline
3. For alternate liquid line options on 18- 42 size units, see Specification
Sheet or
Long Line Application Guideline
Connection
&Max.Tube
Diameter
Connection
Diameter
Tub e
Diameter
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.
A05178
Fig. 3 - Liquid Line Filter Drier
421 01 5501 04 3
Specifications subject to change without notice.
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