Comfort Star ADA series Installation instructions

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Installation &Operation Instructions
For R410A (ADA & ADH) Series
RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION
ATTENTION INSTALLING PERSONNEL
Prior to installation, thoroughly familiarize yourself with this Installation Manual. Observe all safety warnings.
During installation or repair, caution is to be observed
It is your responsibility to install the product safely and to educate the customer on its safe use
Eair LLC
12201 N.W. 107th Avenue, Medley, FL 33178
www.comfortstarusa.com

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TABLE OF CONTENTS
Safety Considerations............................................................................................. 3
Physical Dimension................................................................................................. 3
2.1 Outdoor Unit............................................................................................................................................................ 3
2.2 Indoor Unit .............................................................................................................................................................. 4
Installation Recommendations .............................................................................. 5
Installation............................................................................................................... 6
STEP 1 —Check Equipment & Jobsite......................................................................................................................... 6
STEP 2 —Install on a Solid, Level Mounting Pad........................................................................................................ 6
STEP 3 —Clearance Requirements............................................................................................................................... 6
STEP 4 —Operating Ambient ....................................................................................................................................... 6
STEP 5 —Elevate Unit.................................................................................................................................................. 7
STEP 6 —Check Piston................................................................................................................................................. 7
STEP 7 —Make Piping Connections............................................................................................................................. 8
STEP 8 —Make Electrical Connections...................................................................................................................... 13
STEP 10 —Start-Up .................................................................................................................................................... 16
STEP 11 —Final Checks ............................................................................................................................................. 18
CARE AND MAINTENANCE............................................................................ 18

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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 National Electrical Code (NEC) for special requirements. 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 may 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.
Physical Dimension
2.1 Outdoor Unit
TABLE 1—Dimension of Outdoor Unit
DIMENSION
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ELECTRICAL SHOCK HAZARD
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.
Failure to follow this warning could result in personal
injury or death
WARNING
MODEL A B C
ADA18-410/ADH18-410 241/2"24"24"
ADA24-410/ADH24-410 241/2"24"24"
ADA30-410/ADH30-410 29"28"28"
ADA36-410/ADH36-410 29"28"28"
ADA42-410/ADH42-410 29"28"28"
ADA48-410/ADH48-410 331/2"28"28"
ADA60-410/ADH60-410 331/2"291/2"291/2"

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Fig.1—Outdoor Unit
2.2 Indoor Unit TABLE 2—Dimension of Indoor Unit
DIMENSIONMODEL A B C D E
HD18 21" 215/16”105/8" 113/16" 431/2"
HD24 21"
215/16”105/8" 113/16"431/2"
HD30 21"
215/16”12" 113/16"493/8"
HD36 21"
215/16”12" 113/16"493/8"
HD42 21"
215/16”12" 113/16"493/8"
HD48 24½” 215/16”133/4" 113/16"493/8"
HD60 24½”
215/16”133/4" 113/16"493/8"

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B
C
D
A
E
Fig.2—Indoor Unit
Installation Recommendations
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. 3.)
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. 3.)
8. Ensure that tubing insulation is pliable and completely surrounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and conform to shape of tubing insulation.
(See Fig. 3.)
10. Isolate hanger straps from insulation by using metal sleeves bent to conform to shape of
insulation.
When outdoor unit is connected to factory--approved indoor unit, outdoor unit contains system
refrigerant charge good for 25 ft.
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.

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Fig.3 – Connecting Tubing Installation
Installation
STEP 1 —Check Equipment & Jobsite
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. It contains information needed to properly install unit. Check rating plate to be sure
unit matches job specifications.
STEP 2 —Install on a Solid, Level Mounting Pad
For hurricane tie downs, contact distributor for details and PE Certification (Professional Engineer), if
required.
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.
NOTE:Unit must be level to within ±2° (±3/8 in./ft.) per compressor manufacturer specifications.
STEP 3 —Clearance Requirements
When installing, allow sufficient space for airflow clearance, wiring, refrigerant piping, and service.
Allow 30--in. clearance to service end of unit and 48 in. above unit. For proper airflow, a 6--in.
clearance on 1 side of unit and 12 in. on all remaining sides must be maintained. Maintain a distance
of 24 in. between units. Position so water, snow, or ice from roof or eaves cannot fall directly on unit.
On rooftop applications, locate unit at least 6 in. above roof surface.
STEP 4 —Operating Ambient
The minimum outdoor operating ambient in cooling mode is 55°F, and the maximum outdoor

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operating ambient in cooling mode is 125°F. The maximum outdoor operating ambient in heating
mode is 66 °F.
STEP 5 —Elevate Unit
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UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Unit must be kept free of an accumulation of water
and/or ice in the basepan.
CAUTION
Elevate unit per local climate and code requirements to provide clearance above estimated snowfall
level and ensure adequate drainage of unit. If using accessory support feet, use installation instructions
from kit for installation.
STEP 6 —Check Piston
There is a piston located in outdoor condensing unit, please verify the piston size based on the below
table. When matching with ComfortStar HD air handler, please make sure replace this piston in HD air
handler.
OUTDOOR UNIT INDOOR UNIT PISTON KIT
PART NO.
ADA18-410 HD18 054
ADA24-410 HD24 060
ADA30-410 HD30 070
ADA36-410 HD36 073
ADA42-410 HD42 079
ADA48-410 HD48 100
ADA60-410 HD60 091
ADH18-410 HD18 054
ADH24-410 HD24 058
ADH30-410 HD30 071
ADH36-410 HD36 066
ADH42-410 HD42 079
ADH48-410 HD60 094
ADH60-410 HD60 100
Table 3 —Piston Chart

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STEP 7 —Make Piping Connections
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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,
vertical rise at service valve.
Refrigerant tubing lengthens up to 36-in, may be buried
without further special consideration. Do not bury lines
longer than 36 in
CAUTION
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UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To prevent damage to unit or service valves, observe the
following:
Use a brazing shield.
Wrap service valves with wet cloth or use a heat sink
material
CAUTION
Outdoor units may be connected to indoor section using accessory tubing package or field--supplied
refrigerant grade tubing of correct size and condition. For tubing requirements beyond 80 ft., substantial
capacity and performance losses can occur. Follow the recommendations in the Long Line
Guideline for long line application. Refer to Table 4 for accessory requirements. Refer to Table 5 for
field tubing diameters. 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.

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Table 4—Accessory Usage
Accessory Required for low-ambient
applications(below 55°
F)
Required for long line
applications(Over 80 ft.) Required for sea coast applications(within 2
miles)
Crankcase Heater Yes Yes No
Evaporator Freeze
Thermostat Yes No No
Winter Start Control Yes No No
Accumulator No No No
Compressor Start Assist
Capacitor and Relay Yes Yes No
Motor Master Control Yes No No
Support Feet Recommended No Recommended
Table5—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters(In.)
Liquid VaporUNIT SIZE Connection Diameter
Tube Diameter Connection Diameter
Rated Tube Diameter
18,24 3/8 3/8 5/8 5/8
30,36,42 3/8 3/8 3/4 3/4
48,60 1/2 1/2 1-1/8 1-1/8
Outdoor Unit Connected to Factory Approved Indoor Unit
These outdoor units are carefully evaluated and listed with specific indoor coils for proper system
performance.
IMPORTANT: Do not apply indoor coils which are not factory approved to these units.
IMPORTANT:DO not apply piston which is in R22 indoor unit to these units. Must use R410a piston which
in the accessories replacing the existent R22 piston.

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UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
Service valves must be wrapped in a heat-sinking
material such as a wet cloth.
damage or improper operation.
CAUTION
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UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
Installation of filter drier in liquid line is required.
damage or improper operation.
CAUTION
Install Liquid Line Filter Drier Indoor
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 5 in. long liquid tube from step 1.
4. Connect and braze liquid refrigerant tube to the filter drier.
Fig.3—Liquid Line Filter Drier

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Leak Testing
Leak test all joints indoors, outdoors, and refrigerant tubing.
Evacuate Refrigerant Tubing and Indoor Coil
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UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
Never use this system compressor as a vacuum pump.
damage or improper operation.
CAUTION
Refrigerant tubes and indoor coil should be evacuated using the recommended the recommended deep
vacuum method of 500 microns. The alternate triple evacuation method may be used if the procedure
outlined below is followed.
IMPORTANT: 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. See Fig. 4.
Fig.4-DeepVacuumGraph

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Fig.5—TripleEvacuationMethod
Triple Evacuation Method
The triple evacuation method should only be used when vacuum pump is only capable of pumping
down to 28 in. of mercury vacuum, and system does not contain any liquid water. Refer to Fig. 5 and
proceed as follows:
1. Pump system down to 28 in. of mercury and allow pump to continue operating for an additional 15
minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and open until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hour. During this time, dry nitrogen will be able
to diffuse throughout the system absorbing moisture.
5. Repeat this procedure as indicated by Fig. 5. System will then be free of any contaminants and water
vapor.
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. Pay close attention to feeder tubes, makings sure
wire ties on feeder tubes are secure and tight.
Refrigerant Charge Determination and Adjustment

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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.
WARNING
Weight in Charge Method
The unit was pre-charged good for 25 ft application, if the line set longer than 25ft, please refer to the following table
for additional charge
Liquid line size (inch) Additional charge for every
additional foot (oz)
3/8 0.62
1/2 0.82
Superheat Method
STEP 8 —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.

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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.
WARNING
NOTE: Operation of unit on improper line voltage constitutes abuse and could affect unit reliability. See
unit rating plate. Do not install 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 from and readily accessible from unit, per Section 440—14 of NEC.
Model Number ADA18-410
ADA24-410
ADA30-410
ADA36-410
ADA42-410
ADA48-410
ADA60-410
Minimum Circuit Ampacity -MCA(amps) 9.8 13.3 16.8 22.5 28.2 27.9 33.3
Minimum Circuit Ampacity-MCA(amps) 13.7 20 20.9 20.9 26.3 32.1 38.7
Maximum Over Current Protective device-MOCP(amps)
15 20 25 35 45 55
Compressor LRA/RLA
39/6.9 48/9.7 70/12.4 96.7/17 105/21.5 115/21 150/25
Model Number ADH18-410
ADH24-410
ADH30-410
ADH36-410
ADH42-410
ADH48-410
ADH60-410
Maximum Over Current Protective device-MOCP(amps)
20 30 35 35 45 55 65
Compressor LRA/RLA
48/10.0 58.3/15 73.0/15.7
77.0/15.7
112/20.0 117/24.3
134/29.3
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.
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Wiring Diagram:
Pig6A.COOL ONLY Wiring DiagramofCondenseUnit(onlyforreference)
Pig6B. Heat Pump Wiring Diagram of Condense Unit (only for reference)

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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:
CAUTION
Front seating service valves are equipped with Schrader
valves.
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ENVIROMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant
to the atmosphere. Recover during system repair or final unit
disposal.
CAUTION
STEP 10 —Start-Up
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UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
To prevent compressor damage or personal injury,
observe the following:
Do not overcharge system with refrigerant.
Do not operate unit in a vacuum or at negative pressure.
Do not disable low pressure switch in scroll compressor
applications.
Dome temperatures may be hot.
In 3 phase applications, incorrect phasing will cause reverse
rotation, resulting in elevated noise levels, equalized
pressures and reduced current draw.Correct by reversing
power connections L1 and L2 on contactor.
CAUTION
Follow these steps to properly start up system:
1. After system is evacuated, fully open liquid and vapor service valves.
2. Unit is shipped with valve stem(s) closed and caps installed. Replace stem caps after system is
opened to refrigerant flow (back seated). Replace caps finger—tight and tighten with wrench an

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！
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
To prevent compressor damage or personal injury,
Do not overcharge system with refrigerant.
Do not operate unit in a vacuum or at negative pressure.
Do not disable low pressure switch in scroll compressor
applications.
Dome temperatures may be hot.
In 3 phase applications, incorrect phasing will cause reverse
rotation, resulting in elevated noise levels, equalized pressures
and reduced current draw.Correct by reversing power
connection L1 and L2 on contactor.
CAUTION
additional 1/12 turn.
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure set point is below indoor ambient
temperature.
5. Set room thermostat to HEAT or COOL and fan control to ON or AUTO mode, as desired.
Operate unit for 15 minutes. Check system refrigerant charge.
Setting on Defrost Control PCB (for Heat Pump unit only)
There are 8 different defrost control setting you can choose by change the dip switch located on
Defrost Control PCB.

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Note: ADH unit do not have outdoor ambient sensor installed, the defrost cycle only based on the
outdoor coil sensor. Therefore, “100”, “101”, “110” and “111” do not apply to ADH units.
T-----------Outdoor ambient temperature
t-----------Accumulation of compressor running time
T1----------Initiation Coil Temperature
T2---------Termination Coil Temperature
The factory default setting is “0 0 0”. After the compressor consecutively runs for 30 minutes, the
defrost cycle will be initiated if the sensor detects the coil temperature ≤32F for consecutive 1 minute.
The defrost cycle will be terminated either the coil temperature reach 68F or the defrost cycle reach 15
minutes.
Defrost Cycle：when the system running in heat pump mode, after the compressor has been
running for “t” minutes continuously, the defrost cycle start if the defrosting temp sensor has been in T1
degree or under T1 degree for 1 minute continuously. During the defrost cycle, the reversing valve is
energized, the outdoor fan stops running and the auxiliary electric heating is energized. The defrost
cycle will be terminated if defrost cycle reach 15 minutes or the coil sensor detects the coil temperature
over T2 degree.
Manually Defrost Cycle
There is a Manually Defrost Button located on the Defrost Control PCB, by press this button , the
system will go to defrost cycle right away to melt the ice on the coil.
STEP 11 —Final Checks
IMPORTANT: Before leaving job, be sure to do the following:
1. Ensure that all wiring is routed away from tubing and sheet metal edges to prevent rub--through or
wire pinching.
2. Ensure that all wiring and tubing is secure in unit before adding panels and covers. Securely fasten all
panels and covers.
3. Tighten service valve stem caps to 1/12--turn past finger tight.
4. Leave Users Manual with owner. Explain system operation and periodic maintenance requirements
outlined in manual.
5. Fill out Dealer Installation Checklist and place in customer file.
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.
Without Outdoor Ambient Sensor installed With Outdoor Ambient Sensor Installed
Dip Switch
Setting 000 001 010 011 100 101 110 111
T - - - - >26F <26F >26F <26F >26F <26F >26F <26F
t 30 min 44 min 60min
90min
30min
60min
44min
60min
60min
90min
90min
120min
T1 32F 28F 32F 32F 28F 14F 28F 14F 28F 5F 28F 5F
T2 68F 68F 68F 68F 68F 60F 68F 60F 68F 60F 68F 60F

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