Daikin DX3SEA User manual
THREE PHASE
CONDENSING UNIT
AIR CONDITIONING
IMPORTANT SAFETY INSTRUCTIONS
The following symbols and labels are used throughout this
manual to indicate immediate or potential safety hazards.
It is the owner’s and installer’s responsibility to read
and comply with all safety information and instructions
accompanying these symbols. Failure to heed safety
information increases the risk of personal injury, property
damage, and/or product damage.
WARNING
WARNING
WARNING
HIGH VOLTAGE
SHIPPING INSPECTION
Always keep the unit upright; laying the unit on its side
or top may cause equipment damage. Shipping damage,
and subsequent investigation is the responsibility of
electrical characteristics, and accessories are correct
prior to installation. The distributor or manufacturer will not
accept claims from dealers for transportation damage or
installation of incorrectly shipped units.
CODES & REGULATIONS
This product is designed and manufactured to comply
with national codes. Installation in accordance with such
codes and/or prevailing local codes/regulations is the
responsibility of the installer. The manufacturer assumes
no responsibility for equipment installed in violation of any
codes or regulations. Rated performance is achieved after
20 hours of operation.
www.daikincomfort.com for Daikin. Within either website,
please select the residential or commercial products menu
and then select the submenu for the type of product to be
installed, such as air conditioners or heat pumps, to access
a list of product pages that each contain links to that
The United States Environmental Protection Agency
Should you have any questions please contact the local
If replacing a condensing unit or air handler, the system
must be manufacturer approved and Air Conditioning,
Heating and Refrigeration Institute (AHRI) matched.
INSTALLATION INSTRUCTIONS
IOD-4046A
03/2023
© 2023
19001 Kermier Rd. Waller, TX 77484
2
Outdoor units are approved for operation above 55°F in
cooling mode. Operation below 55°F requires the use of an
approved low ambient kit. LAKT01 Low ambient kit
Damage to the unit caused by operating the unit in a
structure that is not complete (either as part of new
construction or renovation) is not covered under the
warranty.
INSTALLATION CLEARANCES
Special consideration must be given to location of the
condensing unit(s) in regard to structures, obstructions,
other units, and any/all other factors that may interfere with
air circulation. Where possible, the top of the unit should
be completely unobstructed; however, if vertical conditions
require placement beneath an obstruction
requirements for air circulation only. Consult all appropriate
Another important consideration in selecting a location for
the valves be placed toward the structure provided the
side away from the structure maintains minimum service
clearance. Corner installations are strongly discouraged.
OK!
OK!
AA AAA
A
CC
CC
OK!
OK!
OK!
OK!
NOT
RECOMMENDED
AA
AA AA
AA
AA
B B B
B
A B C AA
Residential 10" 10" 18" 20"
Light Commercial 12" 12" 18" 24"
level foundation that will not shift or settle. To reduce the
possibility of sound transmission, the foundation slab
should not be in contact with or be an integral part of the
support the unit. A concrete slab raised above ground level
provides a suitable base.
ROOFTOP INSTALLATIONS
If it is necessary to install this unit on a roof structure,
ensure the roof structure can support the weight and that
proper consideration is given to the weather-tight integrity
of the roof. Since the unit can vibrate during operation,
sound vibration transmission should be considered when
installing the unit. Vibration absorbing pads or springs can
be installed between the condensing unit legs or frame and
the roof mounting assembly to reduce noise vibration.
WARNING
SAFE REFRIGERANT HANDLING
While these items will not cover every conceivable
situation, they should serve as a useful guide.
WARNING
•
•
•
•
WARNING
•
•
•
•
3
WARNING
•
•
•
CAUTION
Use only refrigerant grade (dehydrated and sealed)
copper tubing to connect the condensing unit with the
indoor evaporator. After cutting the tubing, install plugs to
keep refrigerant tubing clean and dry prior to and during
installation. Tubing should always be cut square keeping
ends round and free from burrs. Clean the tubing to
prevent contamination.
Do NOT let refrigerant lines come in direct contact with
walls. When running refrigerant lines through a foundation
or wall, openings should allow for sound and vibration
absorbing material to be placed or installed between tubing
and foundation. Any gap between foundation or wall and
based caulk, RTV or a vibration damping material. Avoid
suspending refrigerant tubing from joists and studs with
rigid wire or straps that would come in contact with the
tubing. Use an insulated or suspension type hanger. Keep
both lines separate and always insulate the suction line.
These sizes are recommended for line lengths of 79 feet
or less to obtain optimum performance. For alternate line
R-410A Long Line Set Application Guidelines or contact
your distributor for assistance.
Cond
Unit
Tons Liq Liq Liq
1 1/2 5/8 1/4 3/4 3/8 3/4 3/8
25/8 1/4 3/4 3/8 3/4 3/8
2 1/2 5/8 1/4 3/4 3/8 7/8 3/8
33/4 3/8 7/8 3/8 1 1/8 3/8
3 1/2 7/8 3/8 1 1/8 3/8 1 1/8 3/8
47/8 3/8 1 1/8 3/8 1 1/8 3/8
57/8 3/8 1 1/8 3/8 1 1/8 3/8
*
Lines greater than 79 f eet in length or v ertical elev ation changes more than
50 f eet TP or
Insulation is necessary to prevent condensation from
recommended. In severe conditions (hot, high humidity
installed in a manner which protects tubing from damage
and contamination.
Where possible, drain as much residual compressor
attention to low areas where oil may collect. Use of an
from the lines or indoor coil. Replacement of indoor coil is
recommended.
4
If burying refrigerant lines can not be avoided, use the
following checklist.
1. Insulate liquid and suction lines separately.
2.
lines in waterproof material (conduit or pipe) sealing
3. If the lines must pass under or through a concrete
slab, ensure lines are adequately protected and
sealed.
Torch heat required to braze tubes of various sizes is
proportional to the size of the tube. Tubes of smaller size
require less heat to bring the tube to brazing temperature
before adding brazing alloy. Applying too much heat to any
tube can melt the tube. Service personnel must use the
appropriate heat level for the size of the tube being brazed.
NOTE:
1. The ends of the refrigerant lines must be cut square,
deburred, cleaned, and be round and free from nicks
or dents. Any other condition increases the chance of
a refrigerant leak.
2.
during brazing to prevent the formation of copper-
present from the inside of the refrigerant lines and
spread it throughout the system. This may cause a
blockage or failure of the metering device.
3. After brazing, quench the joints with water or a wet
cloth to prevent overheating of the service valve.
4.
been burned or chipped, repaint or treat with a rust
preventative. This is especially important on suction
unit is operating.
are removed from refrigerant tubing.
WARNING
WARNING
Allow the pressure to stabilize and hold for 15 minutes
procedure outlined below to identify system leaks. Repeat
WARNING
WARNING
5
Leak test the system using dry nitrogen and soapy
water to identify leaks. If you prefer to use an electronic
When leaks are discovered, repair the leaks, and repeat
the pressure test. If leaks have been eliminated proceed to
system evacuation.
Condensing unit liquid and suction valves are closed to
contain the charge within the unit. The unit is shipped with
the valve stems closed and caps installed.
WARNING
REFRIGERANT UNDER PRESSURE!
CAUTION
condensable air and moisture. As an alternative, the Triple
this product model.
It is recommended to remove the Schrader Cores from the
evacuation procedure.
1. Connect the vacuum pump, micron gauge, and
vacuum rated hoses to both service valves.
system mechanical seals.
2.
3. Isolate the pump from the system and hold vacuum
for 10 minutes (minimum). Typically, pressure will rise
slowly during this period. If the pressure rises to less
than 1000 microns and remains steady, the system is
considered leak-free; proceed to system charging and
startup.
4. If pressure rises above 1000 microns but holds steady
below 2000 microns, non-condensable air or moisture
may remain or a small leak is present. Return to step
repair. Repeat the evacuation procedure.
5. If pressure rises above 2000 microns, a leak is
present. Check for leaks and repair. Repeat the
evacuation procedure.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2 3 4 5 6 7 8 9 10
PRESENT
V
IN
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
PHASE OPERATION
For units designed for 3-phase operation, DO NOT
be in agreement with the unit rating plate power
requirements.
Rated Voltage
Voltage
Voltage
208 / 230V 197 253
460V 414 506
The unit rating plate lists pertinent electrical data necessary
for proper electrical service and overcurrent protection.
from the main breaker or fuse panel to the unit. Consult
serial plate. The supply voltage can be unbalanced (phase
to phase) within 2%. The following formula can be used to
determine the percentage of the voltage unbalance for your
unit.
Voltage = Average Voltage
Unbalance Average Voltage
Example:
L1 - L2 = 220 V
L2 - L3 = 216 V
Avg. Voltage: = (220 + 216 + 213) / 3
= 649 / 3
Maximum Deviation from Average = 220 - 216 = 4
% Voltage Unbalance = 100 x (4 / 216)
= 400 / 216
6
Wire
Size
10 15 20 25 30 35 40 45
14 77 51 38 NR NR NR NR NR
12 122 81 61 49 NR NR NR NR
10 193 129 97 77 64 55 NR NR
8 307 205 154 123 103 88 77 68
Local codes often require a disconnect switch located near
the unit; do not install the switch on the unit. Refer to the
installation instructions supplied with the indoor furnace /
with the thermostat for mounting and location information.
WARNING
HIGH VOLTAGE!
WARNING
NOTICE
THERMOSTAT
2-STAGE HEATING WITH
2-STAGE COOLING
Two-Stage Thermostat
with Three Low Voltage Wires to
Remote
2
2
2
1
2
1
12
The following overcurrent protection devices are approved
for use.
• Time delay fuses
• HACR type circuit breakers
motor-compressor to start and accelerate its load.
CAUTION
Three phase compressors are power phase dependent
and can rotate in either direction.
Verify proper rotation for three phase compressors by
ensuring the suction pressure drops and discharge
pressure rises when the compressor is energized.
To correct, disconnect power and switch any two leads at
the unit contactor and re-observe.
Route power supply and ground wires through the high
voltage port and terminate in accordance with the wiring
diagram provided inside the control panel cover.
Condensing unit control wiring requires 24 Volt minimum,
25VA service from the indoor transformer. Low voltage
wiring for two-stage units depends on the thermostat used
and the number of control wires between the indoor unit
and the condensing unit. Route control wires through the
low voltage port and terminate in accordance with the
wiring diagram provided inside the control panel cover.
WITH
7
SYSTEM START UP
CAUTION
POSSIBLE REFRIGERANT LEAK
When opening valves with retainers, open each valve
avoid loss of refrigerant, DO NOT apply pressure to the
retainer. When opening valves without a retainer remove
counterclockwise. Open the valve until it contacts the rolled
lip of the valve body.
Adequate refrigerant charge for the matching HSVTC
evaporator coil and 15 feet of lineset is supplied with
the condensing unit. If using evaporator coils other than
HSVTC coil, it may be necessary to add or remove
feet in length, refrigerant should be added at .6 ounces per
foot of liquid line.
Break vacuum by fully opening liquid service valve.
After the refrigerant charge has bled into the system,
open the suction service valve. The service valve cap is
the secondary seal for the valves and must be properly
apply refrigerant oil to threads and sealing surface on
1.
2.
3.
4.
Do not introduce liquid refrigerant from the cylinder into
the crankcase of the compressor as this may damage the
compressor.
CAUTION
POSSIBLE REFRIGERANT LEAK
1. Break vacuum by fully opening liquid and suction
base valves.
2. Set thermostat to call for cooling. Check indoor and
outdoor fan operation and allow system to stabilize
WARNING
REFRIGERANT UNDER PRESSURE!
•
•
CAUTION
NOTICE
CAUTION
1.
2.
3.
Sheet for Indoor Unit.
4.
RSD6200006R**.
8
The outdoor temperature must be 60°F or higher. Set the
room thermostat to COOL, fan switch to AUTO, and set the
temperature control well below room temperature.
Units matched with indoor coils equipped with a non-
adjustable TXV should be charged by Subcooling only.
Superheat on indoor coils with adjustable TXV valves are
factory set and no adjustment is normally required during
startup. Only in unique applications due to refrigerant
and outdoor unit and refrigerant tubing sizes or poor
performance should Superheat setting require adjustment.
These adjustments should only be performed by
CAUTION
1.
to base-valve service ports. Run system at least 10
minutes to allow pressure to stabilize.
2.
thermometer makes adequate contact and is insulated
for best possible readings. Use vapor temperature to
determine superheat.
3. Refer to the superheat table provided for proper
system superheat. Add charge to lower superheat or
recover charge to raise superheat.
4. Disconnect manifold set, installation is complete.
9
55 57 59 61 63 65 67 69 71
10 13 17 20 23 26 29 30 31
8 11 14 16 19 22 26 27 29
5 8 10 13 15 19 23 24 25
------ 6 9 11 15 20 21 23
------------ 7 12 17 18 20
--------------- 8 13 15 16
--------------- 7 10 11 13
------------------ 7 8 10
--------------------- 7 8
------------------------ 7
---------------------------
---------------------------
105
110
115
75
80
85
90
95
100
System Superheat Targets for Piston Match-ups (+/- 1.0 °F)
Indoor Wet Bulb Temperature, °F
Outdoor Dry Bulb
Temperature, °F
60
65
70
10
SUCTION PRESSURE
SATURATED SUCTION
TEMPERATURE ºF
PSIG R-410A
50 1
52 3
54 4
56 6
58 7
60 8
62 10
64 11
66 13
68 14
70 15
72 16
74 17
76 19
78 20
80 21
85 24
90 26
95 29
100 31
110 36
120 41
130 45
140 49
150 53
160 56
170 60
SATURATED SUCTION PRESSURE
TEMPERATURE CHART
LIQUID PRESSURE
SATURATED LIQUID
TEMPERATURE ºF
PSIG R-410A
200 70
210 73
220 76
225 78
235 80
245 83
255 85
265 88
275 90
285 92
295 95
305 97
325 101
355 108
375 112
405 118
415 119
425 121
435 123
445 125
475 130
500 134
525 138
550 142
575 145
600 149
625 152
SATURATED LIQUID PRESSURE
TEMPERATURE CHART
11
1.
to base-valve service ports. Run system at least 10
minutes to allow pressure to stabilize.
2. Clamp a pipe clamp thermometer on the liquid line
near the liquid line service valve and 4-6" from the
compressor on the suction line.
a.
to obtain the best possible readings.
b. The temperature read with the thermometer
should be lower than the saturated condensing
temperature.
3.
condensing temperature and the liquid line
temperature is the liquid Subcooling value.
4. TXV-based systems should have a Subcooling value
of 8°F +/- 1°F.
5. Add refrigerant to increase Subcooling and remove
refrigerant to decrease Subcooling.
Tonnage SH at Compressor
1.5 14°F +/- 1°F
2 11°F +/- 1°F
2.5 9°F +/- 1°F
3 9°F +/- 1°F
3.5 9°F +/- 1°F
4 9°F +/- 1°F
5 9°F +/- 1°F
ADVANCED ADJUSTMENT
RECOMMENDATIONS
TEMPERATURE
1. Clamp a pipe clamp thermometer near the suction line
a.
for the best possible readings.
b. The temperature read with the thermometer
should be higher than the saturated suction
temperature.
2.
suction temperature and the suction line temperature
is the Superheat value.
3. TXV-based systems should have a Superheat value
as shown in the table below.
4. Adjust Superheat by turning the TXV valve stem
clockwise to increase and to
decrease.
a. If Subcooling and Superheat are low, the
below and then check Subcooling.
b. If Subcooling is low and Superheat is high, add
charge to raise Subcooling to 8°F +/- 1°F then
check Superheat.
c. If Subcooling and Superheat are high, the
below then check the Subcooling value.
d. If Subcooling is high and Superheat is low,
table below and remove charge to lower the
Subcooling to 8°F +/- 1°F.
NOTE: DO NOT
12
TROUBLESHOOTING INFORMATION
Cooling
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SYMPTOM
System will not start
Compressor will not start - fan runs
Compressor and Condenser Fan will not start
Condenser fan will not start
Compressor runs - goes off on overload
Compressor cycles on overload
System runs continuously - little cooling
Too cool and then too warm
Not cool enough on warm days
Certain areas to cool others to warm
Compressor is noisy
Low suction pressure
Low head pressure
High suction pressure
High head pressure
Test Method
Remedy
•Test Voltage
Blown Fuse •••Impact Fuse Size & Type
Loose Connection • • • • Inspect Connection - Tighten
Shorted or Broken Wires •••••• Test Circuits with Ohmmeter
Open Overload • • Test Continuity of Overloads
Faulty Thermostat ••• • Test Continuity of Thermostat and Wiring
Faulty Transformer ••Check Control Circuit with Voltmeter
Shorted or Open Capacitor • •••Test Capacitor
Internal Compressor Overload Open •Test Continuity of Overload
Shorted or Grounded Compressor ••
Compressor Stuck ••Use Test Cord
Faulty Compressor Contactor •• • • Test Continuity of Coil and Contacts
Faulty Fan Relay •Test Continuity of Coil and Contacts
Open Control Circuit Test Control Circuit with Voltmeter
Low Voltage • • • Test Voltage
••Repair or Replace
• • •
Improper Cooling Anticipator •Check Resistance of Anticipator
Shortage or Refrigerant • • • • Test For Leaks, Add Refrigerant
Restricted Liquid Line •• • •
Undersized Liquid Line • • • Replace Line
Undersized Suction Line •Replace Line
• • • •
•Reduce Blower Speed
Overcharge of Refrigerant • • · • •
Noncondensibles • • •
Recirculation of Condensing Air • • •Remove Obstruction to Air Flow
Infiltration of Outdoor Air • • •
Improperly Located Thermostat •Relocate Thermostat
Air Flow Unbalanced • • Readjust Air Volume Dampers
System Undersized • • Refigure Cooling Load
•Replace Compressor
Broken Valves •
Inefficient Compressor • • •
•Reset and Test Control
• • •Test Voltage
• • • Replace Valve
• • • • • • Replace Valve
• • Replace Valve
• • • • • Replace Valve
• • Tighten Bulb Bracket
• • • Check Valve Operation
Loose Hold-down Bolts •Tighten Bolts
No Cooling
S yst e m
NOTICE
13
We strongly recommend a bi-annual maintenance checkup be performed
before the heating and cooling seasons begin by a qualied servicer.
your comfort system clean. A dirty coil could cause poor
operation and/or severe equipment damage.
installer of your air conditioner or heat pump can tell you
of catching small airborne particles.
The compressor motor is hermetically sealed and does not
require additional oiling.
Indoor and outdoor fan motors are permanently lubricated
and do not require additional oiling.
WARNING
HIGH VOLTAGE!
comfort system. Do not construct a fence near the unit or
severe equipment damage.
Likewise, it is important to keep the outdoor coil clean.
cleaning of the outdoor coil becomes necessary, hire
tubing could eventually cause a large loss of refrigerant.
Loss of refrigerant can cause poor operation and/or severe
equipment damage.
avoid moisture buildup.
BEFORE CALLING YOUR SERVICER
• Check the thermostat
• Wait 15 minutes. Some devices in the outdoor unit or
in programmable thermostats will prevent compressor
operation for awhile, and then reset automatically.
Also, some power companies will install devices
hot days. If you wait several minutes, the unit may
begin operation on its own.
CAUTION
• Check the electrical panel for tripped circuit breakers
or failed fuses. Reset the circuit breakers or replace
fuses as necessary.
• Check the disconnect switch near the indoor furnace
• Check for obstructions on the outdoor unit
that it has not been covered on the sides or the top.
Remove any obstruction that can be safely removed.
servicer to clean it.
• Check for blockage of the indoor air inlets and outlets.
blocked by objects (rugs, curtains or furniture).
• . If it is dirty, clean or replace it.
• Listen for any unusual noise(s), other than normal
operating noise, that might be coming from the
outdoor unit. If you hear unusual noise(s) coming from
SPLIT SYSTEMS
14
Condenser / Heat Pump (including all Inverter)
ELECTRICAL (Outdoor Unit)
Line Voltage (Measure L1and L2 Voltage) L1 - L2
Secondary Voltage (Measure Transformer Output Voltage) NOT ALL MODELS R - C
Compressor Amps
Condenser Fan Amps
TEMPERATURES (Indoor Unit)
Return Air Temperature (Dry bulb / Wet bulb) DB °F WB °F
DB °F WB °F
Delta T (Difference between Supply and Return Temperatures) DB °F
PRESSURES / TEMPERATURES (Outdoor Unit)
Suction Circuit (Pressure / Suction Line Temperature) PSIG TEMP °F
Liquid Circuit (Pressure / Liquid Temperature) PSIG TEMP °F
Outdoor Air Temperature (Dry bulb / Wet bulb) DB °F WB °F
SUPERHEAT / SUBCOOLING SH SC
Line set length in Feet
Additional Refrigerant Charge Added over Factory Charge (Ounces)
Additional Checks
Check wire routings for any rubbing
Check factory wiring and wire connections.
Check product for proper clearances as noted by installtion instructions
°F to °C formula: (°F - 32) divided by 1.8 = °C °C to °F formula: (°C multiplied by 1.8) + 32 = °F
Model Number
Serial Number
Cooling Supply Air Temperature (Dry bulb / Wet bulb)
15
16
© 2023
19001 Kermier Rd. Waller, TX 77484
CUSTOMER FEEDBACK
Daikin Comfort Technologies is very interested in all product comments.
PRODUCT REGISTRATION
Thank you for your recent purchase. Though not required to get the protection of the standard
warranty, registering your product is a relatively short process, and entitles you to additional
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