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 factoryauthorized 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 safetyalert 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 safetyalert 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.
!WARNING
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
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 vibration.
5.When passing refrigerant tubes through the wall, seal opening with RTV or other pliable siliconbased 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 |
NOTE: Avoid contact between tubing and structure
OUTDOOR WALL
CAULK |
LIQUID TUBE |
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INSULATION |
VAPOR TUBE |
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THROUGH THE WALL |
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JOIST |
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HANGER STRAP |
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(AROUND VAPOR |
INSULATION |
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TUBE ONLY) |
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VAPOR TUBE |
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1” (25.4 mm) MIN. |
LIQUID TUBE |
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SUSPENSION |
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A94026
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 liquidline 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 factorysupplied liquidline filter drier. If replacing the filter drier, refer to Specification Sheets for appropriate part number. Obtain replacement filter driers from your distributor or branch.
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 loadbearing 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 12in. (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 non13 SEER models and 115_F (46.11_C) for 13 SEER models.
Make Piping Connections
!WARNING
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 flowcontrol devices, including solenoid valves.
Federal regulations require that you do not vent refrigerant to the atmosphere. Recover during system repair or final unit disposal.
!CAUTION
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 36in (914.4 mm). may be buried without further special consideration. Do not bury lines more than 36in. (914.4 mm).
2 |
Specifications subject to change without notice. |
421 01 5501 04 |
3/8- in. (9.53 mm) Dia. Tiedown Knockouts in Basepan(2) Places
View From Top |
UNIT BASE PAN |
TIEDOWN KNOCKOUT LOCATIONS in. (mm) |
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Dimension in. (mm) |
A |
B |
C |
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23- 1/2 X 23- 1/2 |
7- 13/16 (198.4) |
4–7/16 (112.7) |
18–1/16 (458.8) |
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(596.9 X 596.9) |
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26 X 26 |
9–1/8 (231.8) |
4–7/16 (112.7) |
21–1/4 (539.8) |
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(660.4 X 660.4) |
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31–1/2 X 31–1/2 |
9–1/8 (231.8) |
6–9/16 (166.7) |
24–11/16 (627.1) |
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(800.1 X 800.1) |
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35 X 35 |
9–1/8 (231.8) |
6–9/16 (166.7) |
28–7/16 (722.3) |
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(889 X 889) |
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A05177 |
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Fig. 2 - Tiedown Knockout Locations
Outdoor units may be connected to indoor section using accessory tubing package or fieldsupplied 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 buriedline applications greater than 36in. (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 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 fieldsupplied or factoryaccessory tubing, and factory supplied filter drier. Check refrigerant charge for maximum efficiency.
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
!CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or improper operation.
Service valves must be wrapped in a heatsinking 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.)
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LIQUID |
RATED VAPOR* |
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UNIT SIZE |
Connection |
Connection |
Tube |
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& Max. Tube |
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Diameter |
Diameter |
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Diameter |
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18, 24 |
3/8 |
3/4 |
3/4 |
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30 |
3/8 |
3/4 |
3/4 |
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36 |
3/8 |
7/8 |
7/8 |
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42, 48 |
3/8 |
7/8 |
7/8 |
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60 |
3/8 |
7/8 |
1- 1/8 |
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*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 1842 size units, see Specification Sheet or
Long Line Application Guideline
Install LiquidLine Filter Drier Indoor
!CAUTION
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 heatsinking 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.
A05178
Fig. 3 - Liquid Line Filter Drier
421 01 5501 04 |
Specifications subject to change without notice. |
3 |
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