AirQuest R4A5S36AKAWA Air Conditioner Condenser Instruction Manual
- June 12, 2024
- AirQuest
Table of Contents
AirQuest R4A5S36AKAWA Air Conditioner Condenser
Product Information
The R4A4S and R4A5S are split-system air conditioners that use R-410A refrigerant. These air conditioners are designed for installation by EPA qualified personnel with appropriate certification. They are not intended for use by individuals with reduced physical, sensory, or mental capabilities, unless they have received supervision or instruction on proper usage.
Safety Considerations
It is important to follow all safety codes and wear safety glasses, protective clothing, and work gloves during installation. A fire extinguisher should be readily available. The instruction manual should be read thoroughly, and all warnings and cautions should be followed. Local building codes and electrical codes should be consulted.
WARNING: ELECTRICAL SHOCK HAZARD
Before installing, modifying, or servicing the system, ensure that the main
electrical disconnect switch is in the OFF position. Lock out and tag the
switch with a suitable warning label.
WARNING: EXPLOSION HAZARD
Air or any gas containing oxygen should never be used for leak testing or
operating refrigerant compressors. Compressor suction pressure should never
operate in a vacuum with service valves closed. Refer to the service manual
for pump-down instructions.
General
Here are some general guidelines for installing the air conditioner:
- The unit should be installed at a location that is 10,000 feet (3000 meters) above sea level or lower.
- Avoid installing the unit near windows, patios, decks, or any area where the operational sound may disturb the customer.
- The vapor and liquid tube diameters should be appropriate for the unit’s capacity.
- Refrigerant tubes should be run without bends, and the centerline bend radius should be less than 2.5 times the external pipe diameter.
- Leave some slack between the structure and the unit to absorb vibration.
- When passing refrigerant tubes through the wall, seal the opening with RTV or other pliable silicon-based caulk.
- Avoid direct tubing contact with water pipes, ductwork, floor joists, wall studs, floors, and walls.
- Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap that comes in direct contact with the tubing.
- Ensure that tubing insulation is pliable and completely surrounds the vapor tube.
- When necessary, use hanger straps that are 1 inch (25 mm) wide and conform to the shape of the tubing insulation.
- Isolate hanger straps from insulation by using metal sleeves bent to conform to the shape of the insulation.
- Provision should be made for the expansion and contraction of long runs of piping.
- Piping and fittings should be protected against adverse environmental effects, such as the accumulation of dirt and debris.
Please refer to the full instruction manual for detailed installation instructions and further safety considerations.
Installation Instructions
NOTE: Read the entire instruction manual before starting the installation.
SAFETY CONSIDERATIONS
IMPORTANT: This appliance shall only be installed by EPA qualified
personnel having appropriate certification. This appliance is not intended for
use by persons (including children) with reduced physical, sensory or mental
capabilities or lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a person
responsible for their safety.
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. 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.
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 personal injury or death.
Never use air or any gas containing oxygen for leak testing or operating
refrigerant compressors. Never allow compressor suction pressure to operate in
a vacuum with service valves closed. See service manual for pump-down
instructions.
GENERAL
NOTE: In some cases noise in the living area has been traced to gas
pulsations from improper installation of equipment.
- This unit is intended to be installed in a location that is 10,000 feet (3000 meters) above sea level or lower.
- Locate unit away from windows, patios, decks, etc. where unit operation sound may disturb customer.
- Ensure that vapor and liquid tube diameters are appropriate for unit capacity.
- Run refrigerant tubes with no bends with centerline bend radius less than 2.5 times the external pipe diameter.
- Leave some slack between structure and unit to absorb vibration.
- When passing refrigerant tubes through the wall, seal opening with RTV or other pliable silicon-based caulk. (See Fig. 1.)
- Avoid direct tubing contact with water pipes, duct work, floor joists, wall studs, floors, and walls.
- 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).
- Ensure that tubing insulation is pliable and completely surrounds vapor tube.
- When necessary, use hanger straps which are 1 in. (25 mm) wide and conform to shape of tubing insulation. (See Fig. 1.)
- Isolate hanger straps from insulation by using metal sleeves bent to conform to shape of insulation.
- Provision shall be made for expansion and contraction of long runs of piping.
- Piping and fittings shall be protected as far as possible against adverse environmental effects. For example, the accumulation of dirt and debris.
- Piping should be installed to reduce the likelihood of hydraulic shock damaging the system.
- Certified piping and components must be used in order to protect against corrosion.
- Flexible pipe elements shall be protected against mechanical damage, excessive stress by torsion, or other forces. They should be checked for mechanical damage annually.
Piping material, routing, and installation shall be include protection from physical damage in operation and service, and be in compliance with the national and local codes and standards of the installation site.
When setting up refrigerant piping, precautions shall be taken to avoid excessive vibration or pulsation
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.
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.
UNIT BASE PAN
Dimension in. (mm)
| TIEDOWN K| NOCKOUT LOCATI| ONS in. (mm)
---|---|---|---
A| B| C
23-1/2 X 23-1/2
(596.9 X 596.9)
| 7-13/16 (198.4)| 4–7/16 (112.7)| 18–1/16 (458.8)
26 X 26
(660.4 X 660.4)
| 9–1/8 (231.8)| 4–7/16 (112.7)| 21–1/4 (539.8)
31–1/2 X 31–1/2
(800.1 X 800.1)
| 9–1/8 (231.8)| 6–9/16 (166.7)| 24–11/16 (627.1)
35 X 35
(889 X 889)
| 9–1/8 (231.8)| 6–9/16 (166.7)| 28–7/16 (722.3)
Fig. 2 – Tiedown Knockout Locations
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. (610 mm) clearance to service
end of unit and 48 in. (1219 mm) (above unit. For proper airflow, a 6-in. (152
mm) clearance on 1 side of unit and 12-in. (305 mm) on all remaining sides
must be maintained. Maintain a distance of 24 in. (610 mm) between units or 18
in. (457 mm) if no overhang within 12 ft. (3.67 m) Position so water, snow, or
ice from roof or eaves cannot fall directly on unit.
NOTE: 18” (457 mm) clearance option described above is approved for
outdoor units with wire grille coil guard only. Units with louver panels
require 24” (610 mm) between units.
On rooftop applications, locate unit at least 6 in. (152 mm) above roof
surface.
Operating Ambient
The minimum outdoor operating ambient in cooling mode without accessory is
55°F (13°C).
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 flow-control devices,
including solenoid valves.
Federal regulations require that refrigerant is not vented into 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 mm). vertical rise at
service valve. Refrigerant tubing lengths up to 36-in (914 mm). may be buried
without further special consideration. Do not bury lines more than 36-in. (914
mm).
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 m). See Product Data for acceptable alternate vapor diameters and
associated capacity losses. For tubing requirements beyond 80 ft. (24 m),
substantial capacity and performance losses can occur. Following the
recommendations in the Residential Piping and Long Line 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 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
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.
When outdoor unit is connect to factory-approved indoor unit, outdoor unit
contains approximate system refrigerant charge for operation with factory
approved AHRI rated indoor unit when connected by 15 ft. (4.6 m) of field-
supplied or factory-accessory tubing, and factory supplied filter drier. Check
refrigerant charge for maximum efficiency.
Unit is factory charged for 15ft (4.57 m) of lineset (except for R4A4S 18 and
24 sizes. Add 18 oz for the 18 size and 6 oz for the 24 size for 15 ft
lineset). For all sizes, adjust charge by adding or removing 0.6 oz/ft of 3/8
liquid line above or below 15 ft. (4.6 m) respectively.
Refrigerant Tubing Connection Outdoor
- IMPORTANT: Maximum liquid-line size is 3/8-in. OD for all residential applications including long line. Refer to Residential Piping and Long Line Guideline for further information.
- IMPORTANT: Always install the factory-supplied liquid-line filter drier. If replacing the filter drier, refer to Product Replacement Parts List. for appropriate part number. Obtain replacement filter driers from your distributor or branch.
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 heat-sinking material such as a wet cloth
while brazing.
Use refrigeration grade tubing. Service valves are closed from factory and
ready for brazing. Clean line set tube ends with emery cloth or steel brush.
Remove any grit or debris. Insert line set tube ends into service valve tube
stubs. Apply heat absorbing paste or heat sink product between service valve
and joint. Wrap service valves with a heat sinking material such as a wet
cloth. Braze joints using a Sil–Fos or Phos–copper alloy. Consult local code
requirements.
Refrigerant tubing and indoor coil are now ready for leak testing. This check
should include all field and factory joints.
NOTE: Some outdoor units contain a mechanical fitting at the liquid
distributor. This connection is not field serviceable and should not be
disturbed.
WARNING
FIRE HAZARD
Failure to following this warning could result in personal injury, death
and/or property damage.
Refrigerant and oil mixture could ignite and burn as it escapes and contacts
brazing torch. Make sure the refrigerant charge is properly removed from both
the high and low sides of the system before brazing any component or lines.
CAUTION
BURN HAZARD
Failure to follow this caution may result in personal injury Components will
be HOT after brazing. Wear appropriate personal protective equipment and allow
to cool before handling parts and equipment.
Table 1 – Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)
UNIT SIZE
| LIQUID | RATED VAPOR
---|---|---
Connection & Max. Tube Diameter| Connection Diameter| Tube
Diameter
18, 24, 30| 3/8| 3/4| 3/4
36, 42, 48,49| 3/8| 7/8| 7/8
60,61| 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:
- Do not apply capillary tube to these units.
- For Tubing Set lengths between 80 and 200 ft. (24 and 61 m) horizontal or 35 ft. (11 m) vertical differential 250 ft. (76.2 m) Total Equivalent Length), refer to the Residential Piping and Long Line Guideline- Air Conditioners and Heat Pumps using Puron refrigerant.
- For alternate liquid line options on 18-42 size units, see Product Data or Residential Piping and Application Guideline
Install Liquid-Line Filter Drier Indoor
Refer to Fig. 3 and install filter drier as follows:
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or improper
operation.
-
Installation of filter drier in liquid line is required.
-
Filter drier must be wrapped in a heat-sinking material such as a wet cloth while brazing.
-
Braze 5-in. liquid tube to the indoor coil.
-
Wrap filter drier with damp cloth.
-
Braze filter drier to above 5-in. (127 mm) liquid tube. Flow arrow must point towards indoor coil.
-
Connect and braze liquid refrigerant tube to the 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
Mandatory Requirements Pressure Proof Check
- Preform a pressure check of the unit with a nitrogen charge of about 200psi.
- The Nitrogen holding charge must NOT decrease in pressure for 1 hour, as indicated by the test gauge. The measuring test gauge resolution not exceeding 5% of the holding charge.
Leak Check
This leak check requires a vacuum pump capable of pulling a vacuum of at least
500 microns and a vacuum gage capable of accurately measuring this vacuum
depth.
WARNING
FIRE HAZARD
Failure to following this warning could result in personal injury, death
and/or property damage.
DO NOT USE FLAMES OR IGNITION SOURCES TO LEAK CHECK.
- Vacuum unit to 500 microns.
- When isolating the unit from the pump, the pressure shall not rise above 1500 microns in 10 minutes.
Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both indoor and outdoor unit
has not shifted during shipment. Ensure tubes are not rubbing against each
other or any sheet metal or wires. Pay close attention to feeder tubes, making
sure wire ties on feeder tubes are secure and tight.
Installing with Indoor Piston
Outdoor Unit Connected to Factory Approved Indoor Unit
Check piston size shipped with indoor unit to see if it matches required
indoor piston size. If it does not match, replace indoor piston with correct
piston size.
The piston included with the FMA, FMC and FMU fan coils are unique to those
products and CANNOT be replaced with the piston shipped with outdoor unit.
Refer to the AHRI Directory to check if a certain combination can use a piston
or requires an accessory TXV.
When changing indoor piston, use a back−up wrench. Hand tighten hex nut, then tighten with wrench 1/2 turn. Do not exceed 30 ft−lbs. The indoor piston contains a Teflon ring (or seal) which is used to seat against the inside of distributor body, and must be installed properly to ensure proper seating. See Fig. 5
Air Conditioner Applied as Replacement Component
If the air conditioner is installed as a replacement component in an existing
piston indoor system, the piston size in the indoor unit should be changed to
the size required for the air conditioner which can be found in the indoor
unit Product Data
Units with Cooling Mode TXV
Units installed with cooling mode TXV require charging by the subcooling
method.
- Operate unit a minimum of 15 minutes before checking charge.
- Measure liquid service valve pressure by attaching an accurate gage to service port.
- Measure liquid line temperature by attaching an accurate thermistor type or electronic thermometer to liquid line near outdoor coil.
- Refer to unit rating plate for required subcooling temperature.
- Refer to Table 2 – Rating Plate (required) Subcooling Temperature. Find the point where required subcooling temperature intersects measured liquid service valve pressure.
- To obtain required subcooling temperature at a specific liquid line pressure, add refrigerant if liquid line temperature is higher than indicated or reclaim refrigerant if temperature is lower. Allow a tolerance of ±3°F (±1.7°C).
Units with Indoor Piston
Units installed with indoor pistons require charging by the superheat
method.
The following procedure is valid when indoor airflow is within ±21 percent of its rated CFM.
- Operate unit a minimum of 15 minutes before checking charge.
- Measure suction pressure by attaching an accurate gage to suction valve service port.
- Measure suction temperature by attaching an accurate thermistor type or electronic thermometer to suction line at service valve.
- Measure outdoor air dry-bulb temperature with thermometer.
- Measure indoor air (entering indoor coil) wet-bulb temperature with a sling psychrometer.
- Refer to Table 3 – Superheat Charging – AC Only. Find outdoor temperature and evaporator entering air wet-bulb temperature. At this intersection, note superheat. Where a dash (–) appears on the table, do not attempt to charge system under these conditions or refrigerant slugging may occur. Charge must be weighted in, adding or removing 0.6 oz/ft of 3/8 liquid line above or below 15 feet (4.6m) respectively.
- Refer to Table 4 – Required Suction-Line Temperature. Find superheat temperature (from #6 above) and suction pressure. At this intersection, note suction line temperature.
- If unit has a higher suction line temperature than charted temperature, add refrigerant until charted temperature is reached.
- If unit has a lower suction line temperature than charted temperature, reclaim refrigerant until charted temperature is reached.
- When adding refrigerant, charge in liquid form into suction service port using a flow-restricting device.
- If outdoor air temperature or pressure at suction valve changes, charge to new suction line temperature indicated on chart.
- Optimum performance will be achieved when the operating charge produces 10°F suction superheat at suction service valve with 95°F (35°C) outdoor ambient and 80°F (27°C) dry bulb (67°F / 19°C) wet bulb) indoor temperature (DOE “A” test conditions) at rated airflow.
Table 2 – Rating Plate (required) Subcooling Temperatures
Measure Liquid Pressure
(psig)
| R-410A Required Liquid Line Temperature °F (°C)
---|---
°F| (°C)| °F| (°C)| °F| (°C)| °F|
(°C)| °F| (°C)| °F| (°C)
6| 3| 8| 4| 10| 6| 12| 7| 14| 8| 16| 9
251| 78| 26| 76| 24| 74| 23| 72| 22| 70| 21| 68| 20
259| 80| 27| 78| 26| 76| 24| 74| 23| 72| 22| 70| 21
266| 82| 28| 80| 27| 78| 26| 76| 24| 74| 23| 72| 22
274| 84| 29| 82| 28| 80| 27| 78| 26| 76| 24| 74| 23
283| 86| 30| 84| 29| 82| 28| 80| 27| 78| 26| 76| 24
291| 88| 31| 86| 30| 84| 29| 82| 28| 80| 27| 78| 26
299| 90| 32| 88| 31| 86| 30| 84| 29| 82| 28| 80| 27
308| 92| 33| 90| 32| 88| 31| 86| 30| 84| 29| 82| 28
317| 94| 34| 92| 33| 90| 32| 88| 31| 86| 30| 84| 29
326| 96| 36| 94| 34| 92| 33| 90| 32| 88| 31| 86| 30
335| 98| 37| 96| 36| 94| 34| 92| 33| 90| 32| 88| 31
345| 100| 38| 98| 37| 96| 36| 94| 34| 92| 33| 90| 32
364| 104| 40| 102| 39| 100| 38| 98| 37| 96| 36| 94| 34
374| 106| 41| 104| 40| 102| 39| 100| 38| 98| 37| 96| 36
384| 108| 42| 106| 41| 104| 40| 102| 39| 100| 38| 98| 37
395| 110| 43| 108| 42| 106| 41| 104| 40| 102| 39| 100| 38
406| 112| 44| 110| 43| 108| 42| 106| 41| 104| 40| 102| 39
416| 114| 46| 112| 44| 110| 43| 108| 42| 106| 41| 104| 40
427| 116| 47| 114| 46| 112| 44| 110| 43| 108| 42| 106| 41
439| 118| 48| 116| 47| 114| 46| 112| 44| 110| 43| 108| 42
450| 120| 49| 118| 48| 116| 47| 114| 46| 112| 44| 110| 43
462| 122| 50| 120| 49| 118| 48| 116| 47| 114| 46| 112| 44
474| 124| 51| 122| 50| 120| 49| 118| 48| 116| 47| 114| 46
Table 3 – Superheat Charging – AC Only
OUTDOOR TEMP (°F) | EVAPORATOR ENTERING AIR TEMPERATURE (°F WB) |
---|---|
50 | 52 |
67 | 68 |
55 | 9 |
60 | 7 |
65 | — |
70 | — |
75 | — |
80 | — |
85 | — |
90 | — |
95 | — |
100 | — |
105 | — |
110 | — |
115 | — |
Notes:
- Optimum performance point, 95°F (35°C) outdoor ambient and (80°F / 27°C dry bulb), (67°F / 19°C wet bulb) indoor conditions. (DOE A Test Conditions)
- Where a dash (—) appears do not attempt to charge system under these conditions or refrigerant slugging may occur. Charge must be weighed in.
- Superheat °F is at low-side service port, Allow a tolerance of ±3°F (±1.7°C)
- Indoor dry bulb between 70°F and 80°F (21°C and 27°C)
Table 4 – Required Suction-Line Temperature
SUPERHEAT TEMP (°F) | SUCTION PRESSURE AT SERVICE PORT (PSIG) |
---|---|
107.8 | 112.2 |
138.8 | 140.8 |
0 | 35 |
2 | 37 |
4 | 39 |
6 | 41 |
8 | 43 |
10 | 45 |
12 | 47 |
14 | 49 |
16 | 51 |
18 | 53 |
20 | 55 |
22 | 57 |
24 | 59 |
26 | 61 |
28 | 63 |
30 | 65 |
32 | 67 |
34 | 69 |
36 | 71 |
38 | 73 |
40 | 75 |
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death. Do
not supply power to unit with compressor terminal box cover removed.
Make Electrical Connections
Be sure field wiring complies with local and national fire, safety, and
electrical codes, and voltage to system is within limits shown on unit rating
plate. Contact local power company for correction of improper voltage. See
unit rating plate for recommended circuit protection device.
- NOTE: Operation of unit on improper line voltage constitutes abuse and could affect unit reliability. See unit rating plate. Do not install unit in system where voltage may fluctuate above or below permissible limits.
- NOTE: Use copper wire only between disconnect switch and unit.
- NOTE: Install branch circuit disconnect of adequate size per NEC to handle unit starting current. Locate disconnect within sight and readily accessible from unit, per Section 440-14 of NEC. Refer to Product Data for breaker sizing.
Route Ground and Power Wires
Remove access panel to gain access to unit wiring. Extend wires from
disconnect through power wiring hole provided and into unit control box.
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death. The
unit cabinet must have an uninterrupted or unbroken ground to minimize
personal injury if an electrical fault should occur. The ground may consist of
electrical wire or metal conduit when installed in accordance with existing
electrical codes.
Connect Ground and Power Wires
This appliance incorporates an earth connection for safety purposes only.
Connect ground wire to ground connection in control box for safety. Connect
power wiring to contactor as shown in Fig. 6.
Connect Control Wiring
Route 24-v control wires through control wiring grommet and connect leads to
control wiring. Refer to thermostat Installation Instructions for wiring
specific unit combinations (see Fig. 7 ).
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If thermostat is
located more than 100 ft. (30 m) from unit, as measured along the control
voltage wires, use No. 16 AWG color-coded wire to avoid excessive voltage
drop.
All wiring must be NEC Class 2 and must be separated from incoming power
leads.
Use furnace transformer, fan coil transformer, or accessory transformer for
control power, 24v/40va minimum.
NOTE: Use of available 24v accessories may exceed the minimum 40va power
requirement. Determine total transformer loading and increase the transformer
capacity or split the load with an accessory transformer as required.
Fig. 7 – Generic Wiring Diagrams (See Thermostat Installation Instruction for specific unit combinations)
Final Wiring Check
IMPORTANT: Check factory wiring and field wire connections to ensure
terminations are secured properly. Check wire routing to ensure wires are not
in contact with tubing, sheet metal, etc.
Compressor Crankcase Heater
When equipped with a crankcase heater, furnish power to heater a minimum of 24
hr before starting unit. To furnish power to heater only, set thermostat to
OFF and close electrical disconnect to outdoor unit. A crankcase heater is
required if refrigerant tubing is longer than 80 ft.(24 m) or when outdoor
unit is 35 ft. (6 m) below indoor unit. Refer to the Residential Piping and
Long Line Guideline and Service Manual.
Install Electrical Accessories
Refer to the individual instructions packaged with kits or accessories when
installing.
Start-Up
CAUTION
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in personal injury, equipment damage
or improper operation.
- Do not overcharge system with refrigerant.
- Do not operate unit in a vacuum or at negative pressure.
- Compressor dome temperatures may be hot.
CAUTION
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective clothing, and gloves when handling refrigerant
and observe the following:
- Front seating service valves are equipped with Schrader valves.
Follow these steps to properly start up system:
- After system is evacuated, fully open liquid and vapor service valves.
- Unit is shipped with valve stem(s) front seated (closed) and caps installed. Replace stem caps after system is opened to refrigerant flow. Replace caps finger-tight and tighten with wrench an additional 1/12 turn.
- Close electrical disconnects to energize system.
Set room thermostat at desired temperature. Be sure set point is below indoor
ambient temperature.
Set room thermostat to COOL and fan control to ON or AUTO mode, as desired.
Operate unit for 15 minutes. Check system refrigerant charge.
3-Phase Monitor
In 3-phase units a small circuit board is factory installed to monitor line
voltage. A small led will flash if a phase problem exists. See code
descriptions on monitor. If LED is flashing, disconnect power to unit and
interchange 2 field-wiring leads on unit contactor.
Table 5 – Three-Phase Monitor LED Indicator
LED | STATUS |
---|---|
OFF | No call for compressor operation |
FLASHING | Reversed phase |
ON | Normal |
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or improper
operation.
Ensure compressor rotation is correct.
- 3-phase scroll compressors are rotation sensitive.
- A flash LED on phase monitor indicates reverse rotation. (See Table 5)
This will not allow contractor to be energized.
- Disconnect power to unit and interchange 2 field-wiring leads on unit contactor.
Sequence of Operation
Turn on power to indoor and outdoor units. Transformer is energized.
On a call for cooling, thermostat makes circuits R-Y and R-G. Circuit R-Y
energizes contactor, starting outdoor fan motor and compressor circuit. R-G
energizes indoor unit blower relay, starting indoor blower motor on high
speed.
When thermostat is satisfied, its contacts open, de-energizing contactor and
blower relay. Compressor and motors should stop.
If indoor unit is equipped with a time-delay relay circuit, the indoor blower
will run up to 90 seconds to increase system efficiency.
Check Charge
Factory charge amount and desired subcooling are shown on unit rating plate.
Charging method is shown on information plate inside unit.
For TXV, use subcooling method. For piston, use superheat method.To properly
check or adjust charge, conditions must be favorable for subcooling charging.
Favorable conditions exist when the outdoor temperature is between 70°F and
100°F (21°C and 38°C), and the indoor temperature is between 70°F and 80°F
(21°C and 27°C). Follow the procedure below:
Unit is factory charged for 15ft (4.57 m) of lineset (except for R4A4S 18 and
24 sizes. Add 18 oz for the 18 size and 6 oz for the 24 size for 15 ft
lineset). For all sizes, adjust charge by adding or removing 0.6 oz/ft of 3/8
liquid line above or below 15 ft. (4.6 m) respectively.
Allow system to operate at least 15 minutes. If conditions are favorable,
check system charge by super heat method for fixed metering device and
subcooling method for TXV. If any adjustment is necessary, adjust charge
slowly and allow system to operate for 15 minutes to stabilize before
declaring a properly charged system.
If the indoor temperature is above 80°F (27°C), and the outdoor temperature is
in the favorable range, adjust system charge by weight based on line length
and allow the indoor temperature to drop to 80°F (27°C) before attempting to
check system charge by subcooling method as described above.
If the indoor temperature is below 70°F (21°C), or the outdoor temperature is
not in the favorable range, adjust charge for line set length above or below
15 ft. (4.6 m) only. Charge level should then be appropriate for the system to
achieve rated capacity. The charge level could then be checked at another time
when the both indoor and outdoor temperatures are in a more favorable range.
NOTE: If line length is beyond 80 ft (24 m) or greater than 35 ft (11 m)
vertical separation, See Residential Piping and Long Line Guideline for
special charging requirements.
WARNING
PERSONAL INJURY AND/OR PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal injury and/or property
damage.
For continued performance, reliability, and safety, the only approved
accessories and replacement parts are those specified by the equipment
manufacturer. The use of non-manufacturer approved parts and accessories could
invalidate the equipment limited warranty and result in fire risk, equipment
malfunction, and failure.
Please review manufacturer’s instructions and replacement part catalogs
available from your equipment supplier.
Table 6 – Accessory Usage
ACCESSORY| REQUIRED FOR LOW-AMBIENT COOLING
APPLICATIONS (Below 55°F/12.8°C)
| **REQUIRED FOR LONG LINE APPLICATIONS *| REQUIRED FOR SEA COAST APPLICATIONS**
(Within 2 miles/3.22 km)
---|---|---|---
Ball Bearing Fan Motor| Standard| Standard| Standard
Compressor Start Assist Capacitor and Relay| Yes| Yes| No
Crankcase Heater| Yes| Yes| No
Evaporator Freeze Thermostat| Yes| No| No
Hard Shut-Off TXV| Yes| Yes| No
Liquid Line Solenoid Valve| No| See Long Line Guideline| No
Low-ambient Pressure Switch| Yes†| No| No
Support Feet| Recommended| No| Recommended
Winter Start Control| Yes‡| No| No
*.For tubing set lengths between 80 and 200 ft. (24 and 61 m) horizontal or 35 ft. (10.7 m) vertical differential (total equivalent length), refer to the Residential Split-System Long Line Application Guideline.
- In units equipped with ECM OD motor, motor and fan needs to be replaced per unit accessory guide to work properly. Unit will not meet AHRI rated efficiency once motor and fan are replaced to use this accessory.
- Required if Low Pressure Switch is factory or field installed.
Final Checks
IMPORTANT: Before leaving job, be sure to do the following:
- Ensure that all wiring is routed away from tubing and sheet metal edges to prevent rub-through or wire pinching.
- Ensure that all wiring and tubing is secure in unit before adding panels and covers. Securely fasten all panels and covers.
- Tighten service valve stem caps to 1/12-turn past finger tight.
- Leave Owner’s Manual with owner. Explain system operation and periodic maintenance requirements outlined in manual.
- Fill out Dealer Installation Checklist and place in customer file.
Repairing Refrigerant Circuit
When breaking into the refrigerant circuit to make repairs, or for any other
purpose, the following procedures shall be used.
- Safely remove the refrigerant using a recovery pump certified for flammable refrigerants.
- Purge the refrigerant circuit with nitrogen gas.
- Evacuate the refrigerant circuit to 1500 microns.
- Break vacuum with a nitrogen purge of the refrigerant circuit ensuring that the outlet of the vacuum pump is not near a potential ignition source.
- Open the circuit by cutting or brazing.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equipment failure,
periodic maintenance must be performed on this equipment. Frequency of
maintenance may vary depending upon geographic areas, such as coastal
applications. See Owner’s Manual for information.
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