Daikin RCS Series Instruction Manual

6.5 – 7.5 Tons
10.0 – 12.0 Tons
15.0 – 20.0 Tons
Installation and Maintenance IM 962-4
Group: Applied Air Systems
Part Number: IM 962-4
Date: June 2023
Air-Cooled Split System
Condensing Units
Models RCS 06G – 20F
6.5 to 20 Tons
R-410A Refrigerant

Table of Contents
Introduction .................................3
Hazard Identication Information ................3
Checking Product Received ....................3
Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standard Unit Features .......................4
Dimensional and Weight Data ..................6
Physical Data ................................8
Electrical Data ...............................9
Installation..................................10
Installation General .........................10
Rooftop Installation ..........................11
Slab Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Installation of Piping .........................12
Refrigerant Charge ..........................16
Final Leak Testing ..........................18
Accessory Installation .......................19
Maintenance and Operation ...................20
Charging Charts ............................21
Wiring Diagrams ............................27
Service and Warranty Procedure ...............30
Warranty Registration Form ...................31
Quality Assurance Survey Form ................34
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©2023 Daikin Applied, Minneapolis, MN. All rights reserved throughout the world.This document contains the most current product information as
of this printing. Daikin Applied Americas Inc. has the right to change the information, design, and construction of the product represented within the
document without prior notice. For the most up-to-date product information, please go to www.DaikinApplied.com.
™® MicroTech, SiteLine, and Daikin Applied are trademarks or registered trademarks of Daikin Applied Americas Inc. The following are trademarks
or registered trademarks of their respective companies: BACnet from American Society of Heating, Refrigerating and Air-Conditioning Engineers,
Inc.; Echelon, LonWorks, LonMark, and LonTalk from Echelon Corporation; Modbus from Schneider Electric; and Windows from Microsoft
Corporation.

Introduction

DANGER
The use of unauthorized components, accessories or devices may adversely
affect the operation of the condensing unit and may also endanger life and
property.
The manufacturer disclaims any responsibility for such loss or injury and
the manufacturer’s warranty does not cover any damage or defect to
the air conditioner caused by the attachment or use of any components,
accessories or devices (other than those authorized by the manufacturer)
into, onto or in conjunction with the condensing unit.
DANGER
Dangers indicate a hazardous situation which will result in death or serious
injury if not avoided.
WARNING
Warnings indicate potentially hazardous situations, which canresult in
property damage, severe personal injury, or death ifnot avoided.
CAUTION
Cautions indicate potentially hazardous situations, which can result in
personal injury or equipment damage if not avoided.
This manual contains the installation and operating instructions
for your split condensing unit. There are a few precautions
that should be taken to derive maximum satisfaction from it.
Improper installation can result in unsatisfactory operation or
dangerous conditions.
Read this manual and any instructions packaged with separate
equipment required to make up the system prior to installation.
Give this manual to the owner and explain its provisions. The
owner should retain this manual for future reference.
Checking Product Received
Upon receiving the unit, inspect it for any damage from
shipment. Claims for damage, either shipping or concealed,
should be led immediately with the shipping company.
Check the unit model number, electrical characteristics, and
accessories to determine if they are correct.
Nomenclature
NOTE: For larger size units (greater than 20 ton), refer to Catalog 222.
R C S – 06 – F – 079 – C
Rooftop Condensing System
Nominal capacity (tons)
06 = 6.5
07 = 7.5
10 = 10
12 = 12
15 = 15
20 = 20
Refrigerant
F = R-410A
G = R-410A
Voltage
C = 208/230 - 3 - 60
D = 460 - 3 - 60
Y = 575 - 3 - 60
Compressor
079 = 6.5 ton, single
091 = 7.5 ton, single
121 = 10 ton, single
150 = 12.5 ton, tandem
180 = 15 ton, tandem
240 = 20 ton, tandem
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Standard Unit Features
Cabinet — Galvanized steel with a durable powder paint
nish. Stamped louvered panels o󰀨er 100% protection for the
condenser coil.
Compressor — Hermetically sealed scroll compressors.
Compressors are mounted on rubber-in-shear pads to reduce
vibration and noise.
Condenser Coil — Constructed with copper tubes and
aluminum ns mechanically bonded to the tubes for maximum
heat transfer capabilities. All coil assemblies are leak tested at
450 psig internal pressure.
Refrigerant Connections — Field piping connections are made
through a xed panel. This allows complete access or removal of
access panels after piping connections have been made.
Crankcase Heater — Standard, all models.
Low Ambient Control — A pressure sensitive fan cycling
control to allow unit operation to 0°F is standard.
Service Valves — Standard on liquid lines and vapor lines.
Service Access — The control box, as well as the compressor
and other refrigerant controls, is accessible through access
panels. It may be opened without a󰀨ecting the normal
operation of the unit. Condenser fan motors are accessible by
removing wire grilles.
Filter Drier — Field supplied.
Sight Glass — Optional, eld supplied.
Transformer — Step down type, line to 24 volts.
Contactor — The contactor is an electrical switch which
operates the compressor and condenser fans.
High Pressure Control — Opens the contactor circuit on high
refrigerant pressure; manual reset.
Low Pressure Control — Stops compressor operation in the
event of loss of refrigerant.
Condenser Fan Motor (Direct Drive) — Ball bearing 1075
RPM motors are mounted to minimize vibration and noise
problems.These are permanent split capacitor types and
require the same capacitance for both run and start.
Testing — All units are run tested at the factory prior to shipment.
Units are shipped with a holding pressure of nitrogen.
Figure 1: RCS 06F and 07F Ton Features
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Figure 2: RCS 10G – 20F Ton Features
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Dimensional and Weight Data
Figure 3: RCS 06G and 07G Dimensions and Weights Table 1: RCS 06G and 07G Operating Weights
RCS
model
Total
weight
lbs. [kg]
Corner weight lbs. [kg]
A B C D
06G 291 [132] 50 [22.7] 73 [33.1] 69 [31.3] 99 [44.9]
07G 318 [144] 53 [24.0] 84 [38.1] 71 [32.2] 110 [49.9]
Table 2: RCS 06G and 07G Unit Dimensions
RCS06G RCS07G
Height “H” Inches [mm] 45[1143] 51 [1295]
Length “L” Inches [mm] 35.75 [908] 35.75 [908]
Width “W” Inches [mm] 35.75 [908] 35.75 [908]
Figure 4: RCS 10G and 12F Dimensions and Weights
Table 3: RCS 10G and 12F Operating Weights
RCS
model
Total
weight
lbs. [kg]
Corner weight lbs. [kg
A B C D
10G 557 [253] 137 [62.0] 148 [67.0] 131 [59.0] 142 [64.0]
12F 650 [293] 160 [72.0] 171 [78.0] 154 [70.0] 165 [75.0]
B
A
C
D
CONTROL
PANEL ACCESS
39.94
75.54
72.375
44.75
38.375
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Figure 5: RCS 15F – 20F Dimensions and Weights
Table 4: RCS 15F and 20F Operating Weights
RCS
model
Total
weight
lbs. [kg]
Corner weight lbs. [kg]
A B C D
15F 746 [338.0] 183 [83.0] 196 [89.0] 177 [80.0] 189 [86.0]
20F 952 [432.0] 234 [106.0] 251 [114.0] 226 [103.0] 241 [110.0]
A
D
C
B
CONTROL
PANEL ACCESS
85.515
39.94
83.875
38.375
44.75
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Physical Data
Unit Capacity and Physical Data
Table 5: RCS 06G – 20F Physical Data
Model RCS
06G Single 07G Single 10G Single 12F Tandem 15F Tandem 20F Tandem
Capacity and Weight
Capacity (tons) [kW] 6.5 [22.9] 7.5 [26.4] 10 [35.2] 12 [42.2] 15 [52.8] 20 [70.3]
Number of circuits 1
Operating weight
(lbs) [Kg] 245 [111.1] 307 [139.2] 557 [253.0] 650 [294.8] 746 [338.4] 952 [431.8]
Shipping weight
(lbs) [Kg] 252 [114.3] 313 [141.9] 597 [271.0] 690 [313.0] 786 [356.5] 992 [450.0]
Compressor
Quantity 1 2
Type Scroll
RPM 3500
Capacity Control,
Stages 1 2
Refrigerant charge
R410A oz. [g] 219 [6209] 400 [11340] 437 [12,389] 378 [10,716] 506 [14,345] 655 [18,569]
Condenser Fans
Quantity 123
CFM [L/s] 5700 [2690] 5700 [2690] 8000 [3775] 8100 [3882] 12,000 [5663] 12,000 [5663]
Diameter (in.) [mm 26 [660] 26 [660] 24 [610] 24 [610] 24 [610] 24 [610]
Drive Direct
“Motor horsepower
each [W]” 1/2 [373] 1/2 [373] 1/3 [249] 1/3 [249] 1/3 [249] 1/3 [249]
Type ECM PSC
RPM 975 1075
Condenser Coil
Quantity 1 2
Rows 1 2 3
Fins per inch 22 22 18 22 22 22
Sq. ft. [m2] 28.38 [2.64] 28.38 [2.64] 32.88 [3.05] 33.9 [3.05] 40.38 [3.75] 40.38 [3.75]
Fins/tubes Aluminum/Copper
Cabinet
Finish Powder Coat
Sheet metal Galvanized
Gauge (nominal) top 20
Sides 20
Base rails 14
Refrigerant Connection
Vapor sweat
(in.) [mm] 1-1/8 [29] 1-1/8 [29] 1-3/8 [35] 1-3/8 [35] 1-5/8 [41.3] 1-5/8 [41.3]
Liquid sweat
(in.) [mm] 1/2 [13] 1/2 [13] 5/8 [16] 5/8 [16] 5/8 [16] 7/8 [22]
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Electrical Data
Power Wiring
Table 6: RCS 06G – 20F Electrical Data
Model RCS
06G 07G 10G 12F 15F 20F
Compressor Motor
Voltage 208/230 460- 208/230 460 208/230 460 208/230 460 575 208/230 460 575 208/230 460 575
Phase and hertz 3 – 60
Number of
compressors 1 2
Operating Current
Rated load amps
(each)125 11.8 27.9 13.6 32.6 14.8 22 .4 10 .6 7 .7 25 .0 12 .2 9 .0 33 .3 17 .9 12 .8
Locked rotor amps
(each)1 149 83 164 100 225 240 130 75 54 164 100 78 239 125 80
Condenser Fan Motors
Voltage 208/230 460 208/230 460 208/230 460 208/230 460 575 208/230 460 575 208/230 460 575
Phase Single
Full load amps
(each) 5.3 2.2 5.3 2.2 3.5 1.6 2 .4 1 .4 1 .0 2 .4 1 .4 1 .0 2 .4 1 .1 0 .8
System Characteristics
Unit full load amps227.7 15.9 30.3 17.5 34 .9 19 .5 49 .6 24 .0 17 .4 57 .2 28 .6 21 .0 73 .8 39 .1 28 .0
Minimum circuit
ampacity 34.0 19.0 37.0 21.0 48.0 22.0 56 .0 27 .0 20 .0 64 .0 32 .0 24 .0 83 .0 44 .0 32 .0
Maximum fuse size
(amps) or HACR
circuit breaker
ampacity3
50 25 60 30 80 40 70 35 25 80 40 30 110 60 40
Disconnect size 60 30 60 30 100 60 60 30 30 100 60 60 200 60 60
NOTE:
1. Each compressor
2. Conditions at 45° suction and 95° ambient
3. Local codes take precedent over recommended fuse size
Figure 6: Control Box Example – RCS 10G Through 20F
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Installation
Order Parts
When reporting shortages or damaged parts, or when ordering
repair parts, give the complete unit model and serial numbers
which are stamped on the unit rating plate.
Standard Items
The condensing unit consists of a completely assembled
package which includes a compressor pack, condenser coils,
fans, fan motors, outdoor control box, factory wiring, factory
tubing and ttings.
Crankcase Heaters
These units are equipped with a crankcase heater that is
factory wired to operate whenever the main power supply to
the unit is “ON” and compressors are “OFF.” Before starting
the equipment after prolonged shutdown or at the time of initial
spring startup, be sure that the circuits to the condensing units
are closed for at least 24 hours.
Corrosive Environment
The metal parts of this unit may be subject to rust or
deterioration if exposed to a corrosive environment. This
oxidation could shorten the equipment’s useful life. Corrosive
elements include salt spray, fog or mist in seacoast areas,
sulphur or chlorine from lawn watering systems, and various
chemical contaminants from industries such as paper mills and
petroleum reneries.
If the unit is to be installed in an area where contaminants are
likely to be a problem, special attention should be given to the
equipment location and exposure.
• Avoid having lawn sprinkler heads spray directly on the
unit cabinet
• In coastal areas, locate the unit on the side of the building
away from the waterfront.
• Shielding provided by a protection, based on clearances
DANGER
Disconnect all power to unit before starting maintenance. Failure to do so
can cause electrical shock resulting in severe personal injury or death.
Regular maintenance will reduce the buildup of contaminants
and help to protect the unit’s nish.
• Frequent washing of the cabinet, fan blade and coil
with fresh water will remove most of the salt or other
contaminants that build up on the unit.
• Regular cleaning and waxing of the cabinet with a good
automobile polish will provide some protection.
• A good liquid cleaner may be used several times a year
to remove matter that will not wash o󰀨 with water.
Several di󰀨erent types of protective coatings are o󰀨ered in
some areas. These coatings may provide some benet, but the
e󰀨ectiveness of such coating materials cannot be veried by
the equipment manufacturer.
Installation General
The condensing unit should be installed outdoors. It should be
located as near as possible to the evaporator section to keep
connecting refrigerant tubing lengths to a minimum. The unit
must be installed to allow a free air ow to the condenser coils
If several units are installed adjacent to each other, take care to
avoid recirculation of air from one condenser to another. In all
installations, adequate space must be provided for installation
and servicing.
The unit must not be connected to any duct work. Do not
locate unit under a roof drip; if necessary, install gutters, etc., to
prevent water runo󰀨 onto the unit. To prevent air recirculation,
it is recommended that the unit not be installed under an
overhang. However, if this is necessary, allow a minimum of
60” above the unit for air discharge
Figure 7: Clearances RCS 06G – 20F Service Clearances
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Rooftop Installation
If rooftop installation is required, make certain that the building
construction is adequate for the weight of the unit. (Table 5)
Before placing the unit on the roof, make certain that the nylon
rigging slings are of su󰀩cient length to maintain equilibrium of
the unit when lifting. Under no circumstances should the unit
be lifted by only one corner for rooftop installation.
Slab Installation
Condensing units should be set on a solid level foundation.
When installed at ground level, the unit should be placed on a
6” cement slab. If the pad is formed at the installation site, do
not pour the pad tight against the structure, otherwise vibration
will be transmitted from the unit through the pad.
Table 7: RCS 06G through 20F Operating Weights
RCS
model
Total
weight
lbs. [kg]
Corner weight lbs. [kg]
A B C D
06G 245 [111.1] 71 [32.2] 54 [24.5] 84 [38.1] 36 [61.9]
07G 313 [141.9] 91 [41.2] 69 [31.3] 107 [48.5] 46 [66.2]
10G 557 [253] 137 [62] 148 [67 .0] 131 [59.0] 142 [64 .0]
12F 650 [293] 160 [72.0] 171 [78.0] 154 [70.0] 165 [75.0]
15F 746 [338.0] 183 [83.0] 196 [89.0] 177 [80.0] 189 [86.0]
20F 952 [432.0] 234 [106.0] 251 [114.0] 226 [103.0] 241 [110.0]
Figure 8: Rigging
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Installation of Piping
WARNING
Do not use oxygen to purge lines or pressure system for leak test. Oxygen
reacts violently with oil, which can cause an explosion resulting in severe
personal injury or death.
NOTE: The condensing unit is shipped with a holding charge
of dry nitrogen which must be purged from the unit
before evacuation.
Once located, the condensing unit is ready to be
interconnected with the evaporator using ONLY refrigeration
grade dehydrated tubing.The following should be considered
when connecting the tubing.
1. Pitch vapor line toward the compressor approximately
1/2” every 10 feet to facilitate oil return.
2. It is recommended that the sight glass, lter drier and
liquid line solenoid valve be installed in the liquid line just
prior to the evaporator.
3. Silver solder (such as silfos, Easy Flow, etc.) should be
used for all refrigerant joints.
4. Thoroughly clean all joints before uxing. DO NOT USE
ACID FLUX.
5. When uxing, limit the application of paste to the
minimum and always apply ux to the male portion of the
connection.
6. Vapor lines should be insulated to prevent condensate
drip. Use insulation of at least 3/8” wall thickness. The
insulation should be installed on the tubing prior to
making the sweat connections.
7. Insulate the liquid line whenever the heat pickup or
transfer can a󰀨ect the subcooling.
8. Care should be taken to avoid transmission of noise or
vibration to building structure.
Table 8: Refrigerant Piping Data
Equivalent Length, ft. [m] of Straight Type “L” Tubing
for Nonferrous Valves/Fittings (Brazed)
Tube
Size,
O.D.
Solenoid
Valve
Angle
Valve
Short
Radius
Ell
Long
Radius
Ell
Tee Line
Flow
Tee
Branch
Flow
1/2 70 [21.3] 8.3 [2.5] 1.6 [0.5] 1.0 [0.3] 1.0 [0.3] 3.1 [0.9]
5/8 72 [21.9] 10.4 [3.2] 1.9 [0.6] 1.2 [0.4] 1.2 [0.4] 3.6 [1.1]
3/4 75 [22.9] 12.5 [3.8] 2.1 [0.7] 1.4 [0.4] 1.4 [0.4] 4.2 [1.3]
7/8 78 [23.8] 14.6 [4.4] 2.4 [0.7] 1.6 [0.5] 1.6 [0.5] 4.8 [1.5]
1-1/8 — 18.8 [5.7] 3.0 [0.9] 2.0 [0.6] 2.0 [0.6] 6.0 [1.8]
1-3/8 — 22.9 [7.0] 3.6 [1.1] 2.4 [0.7] 2.4 [0.7] 7.2 [2.2]
1-5/8 — 27.1 [8.3] 4.2 [1.3] 2.8 [0.8] 2.8 [0.8] 8.4 [2.6]
2-1/8 — 35.4 [10.8] 5.3 [1.6] 3.5 [1.1] 10.7 [3.3] 10.7 [3.3]
Typical Piping Recommendations
The following will be of help in accomplishing a successful
1. Size liquid line for no more than 10°F loss which
corresponds to approximately 3 psig pressure drop.
2. Size vapor lines for no more than 2°F loss which
corresponds to approximately 3 psig pressure drop.
3. Install sight glass, lter drier and solenoid valve in
liquid line adjacent to evaporator. Filter drier should be
between the condensing unit and sight glass.
4. Pitch all horizontal vapor lines downward in the direction
of ow (1/2” to 10 ft. run).
5. When making up refrigerant piping, take every
precaution to prevent dirt and moisture from entering the
piping.
6. Locate the condensing unit and evaporator(s) as close
together as possible to minimize piping runs.
7. Liquid or vapor lifts not to exceed 60 ft.
8. To prevent suction line breakage due to vibration and to
prevent tubing noise transmission into the conditioned
space, the suction clamp must be installed after tubing is
brazed as illustrated in Figure 9.
Figure 9: Suction Clamp
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Table 9: Recommended Vapor and Liquid Line Sizes for Various Lengths of Run
Recommended Vapor and Liquid Line Sizes for Various Lengths of Run
Equivalent
Length to
Evaporator
(ft)
Cooling Model
Liquid Line O.D. Sizes (in) Vapor Line O.D. Sizes (in)
6 7 10 12 15 20 6 7 10 12 15 20
0 to 15 1/2 1/2 5/8 5/8 5/8 7/8 1-1/8 1-1/8 1-3/8 1-3/8 1-5/8 1-5/8
16 to 50 1/2 1/2 5/8 5/8 5/8 7/8 1-1/8 1-1/8 1-3/8 1-5/8 1-5/8 1-5/8
51 to 100 1/2 1/2 5/8 5/8 3/4 7/8 1-1/8 1-3/8 1-3/8 1-5/8 1-5/8 2-1/8
101 to 150 1/2 1/2 5/8 5/8 3/4 7/8 1-3/8 1-3/8 1-5/8 2-1/8 2-1/8 2-1/8
NOTE: Line length between condenser and evaporator (suction and liquid) not to exceed 150' equivalent length.
Figure 10: Liquid Line Pressure Drop Per 100 Feet
Equivalent Length (Type L Copper Tubing)
Note:
1. When evaporator coil is above condenser, the pressure
drop due to vertical lift (0.5 PSIG per foot of lift) must be
added to the pressure drop derived from this curve.
2. Size liquid line for no more than 10°F loss (approximately
30 PSIG total pressure drop).
3. Do not oversize liquid line. Oversized liquid lines add
signicantly to the amount of refrigerant required to
charge the system.
4. The maximum recommended velocity with solenoid
valves or other quick closing devices in the liquid line is
300 FPM.
Figure 11: Suction Line System Capacity Loss In Percent
Per 100 Feet Equivalent Length (Type L Copper Tubing)
Note:
1. The minimum velocity line (700 fpm) is recommended
for cooling only units with vertical or horizontal run
refrigerant lines.
2. For suction pressure drop (PSIG), multiply percent (%)
loss by 1.18.
Figure 12: Typical Drain Piping
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Figure 13: Coil Above Condensing Unit
Figure 14: Coil Below Condensing Unit
Electrical Wiring
NOTE: Field wiring must comply with the National Electric
Code (CEC in Canada) and any local ordinance that
may apply.
Electrical Power
It is important that proper electrical power is available at the
unit. Voltage must not vary more than 10% from that stamped
on the rating plate. (See Table 6 on page 9 for minimum and
maximum voltage.) Interphase voltage variation on three-phase
units must not be more than 3%. Contact local power company
for correction of improper voltage or phase unbalance.
Important: Models equipped with scroll compressors must
be phased correctly for proper compressor rotation. If the
compressor is noisy or if suction and discharge pressures
do not appear normal, reverse any two power leads to the
unit. Extended run time in reverse rotation will damage the
compressor and lead to premature failure.
Power Wiring
Power wiring should be run in grounded rain-tight conduit. See
Table 6 for wire ampacity and proper wire size.
Wire Routing
POWER WIRING MUST BE RUN IN CONDUIT. Conduit must
be run through the connector panel below the service cover
and attached to the bottom of the control box.
If low (extra-low in Canada) voltage control wire is run in
conduit with power supply, Class I insulation is required. If run
separate, Class II is required. Low voltage wiring may be run
through the insulated bushing provided in the 7/8” hole in the
connector panel, then route to the control box.
WARNING
After completing wiring, check all electrical connections, including factory wiring
within the unit. Make sure all connections are tight. eplace and secure all electrical
box covers and access doors before leaving the unit or turning on power to the unit.
Failure to do so can cause a re or electrical shock resulting in property damage,
personal injury or death.
IM 962-4 • AIR-COOLED SPLIT SYSTEM CONDENSERS 14 www.DaikinApplied.com
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Table 10: Field Wire Size for 24 Volt Thermostat
Thermostat Load
Amps Solid Copper Wire –AWG
3.0 16 12 10 10 10
2.5 16 12 12 10 10
2.0 18 14 12 12 10
Length of Run, ft(1) 50 150 200 250 300
(1) Wire length equals twice the run distance.
Grounding
A grounding lug is provided in control box for a ground wire.
Grounding also may be accomplished by grounding the power
line conduit to the unit.
WARNING
This unit must be permanently grounded. A ground lug is provided near the
contactor for a ground wire. Failure to do so can cause a re or electrical
shock resulting in property damage, severe personal injury or death.
Thermostat
An appropriate thermostat should be mounted on an inside wall
in a location where it will not be a󰀨ected by the sun or drafts,
from open doors or other sources. Install, level, and after
installation check the thermostat calibration and recalibrate if
necessary. Refer to thermostat manufacturer’s information for
additional installation, checkout and operation instructions.
Table 11: Copper Wire Size (1% Voltage Drop)
Circuit
Ampacity
Copper Wire Gauge (75°C Insulation)
Distance In Feet
100 150 200 250 300
4064321
45 4 3 2 1 1/0
50 4 3 2 1 1/0
60 4 2 1 1/0 2/0
70 3 2 1/0 2/0 3/0
80 3 1 1/0 2/0 3/0
90 2 1/0 2/0 3/0 4/0
100 2 1/0 2/0 3/0 4/0
110 1 2/0 3/0 4/0 250
125 1 2/0 3/0 4/0 250
Figure 15: Typical Field Wiring Connections
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www.DaikinApplied.com 15 IM 962-4 • AIR-COOLED SPLIT SYSTEM CONDENSERS

Refrigerant Charge
Leak Testing
Pressurize line set and coil through service ttings with dry
nitrogen to 150 psig maximum. Leak test all joints using liquid
detergent. If a leak is found, recover pressure and repair.
WARNING
Do not use oxygen to purge lines or pressure system for leak test. Oxygen
reacts violently with oil, which can cause an explosion resulting in severe
personal injury or death.
Table 12: Basic System Charge*
Unit Charge oz [g]
06G 219 [6,209]
07G 400 [11,340]
10G 437 [12,389]
12F 378 [10,716]
15F 506 [14,345]
20F 655 [18,569]
NOTE: *System with 0 Feet of Tubing
Table 13: Required Ounces of R410A Charge per Foot of
Tubing
Tube Size O.D., in [mm] Liquid Tube, oz [g] Vapor, oz [g]
1/2 [12.7] 1.06 [30.0] 0.04 [1.13]
5/8 [15.88] 1.65 [46.7] 0.07 [1.98]
3/4 [19.05] 2.46 [69.7] 0.10 [2.83]
7/8 [22.23] 3.28 [92.9] 0.13 [3.68]
1-1/8 [28.58] — 0.22 [6.23]
1-3/8 [34.93] — 0.34 [9.63]
1-5/8 [41.28] — 0.48 [13.60]
2-1/8 [53.98] — 0.84 [23.81]
NOTE: Quantities based on 110°F liquid and 45°F vapor
Tools Required for Installing and
Servicing R410A Models
Manifold Sets:
• Up to 800 PSIG High side
• Up to 250 PSIG Low Side
• 550 PSIG Low Side Retard
Manifold Hoses:
• Service Pressure Rating of 800 PSIG
Recovery Cylinders:
• 400 PSIG Pressure Rating
• Dept. of Transportation 4BA400 or BW400
CAUTION
R410A systems operate at higher pressures than R22 systems. Do not use
R22 service equipment or components on R410A equipment

Application: R410A is not a drop-in replacement for R22;
equipment designs must accommodate its higher pressures. It
cannot be retrotted into R22 condensing units.
Physical Properties: R410A has an atmospheric boiling point
of 62.9°F and its saturation pressure at 77°F is 224.5 psig.
Composition: R410A is an azeotropic mixture of 50%
by weight diuoromethane (HFC32) and 50% by weight
pentauoroethane (HFC125).
Pressure: The pressure of R410A is approximately 60% (1.6
times) greater than R22. Recovery and recycle equipment,
pumps, hoses and the like need to have design pressure
ratings appropriate for R410A. Manifold sets need to range
up to 800 psig high-side and 250 psig low-side with a 550
psig low-side retard. Hoses need to have a service pressure
rating of 800 psig. Recovery cylinders need to have a 400 psig
service pressure rating. DOT 4BA400 or BW400.
Combustibility: At pressures above 1 atmosphere, mixture
of R410A and air can become combustible. R410A and air
should never be mixed in tanks or supply lines, or be allowed
to accumulate in storage tanks. Leak checking should never
be done with a mixture of R410A and air. Leak checking can
be performed safely with nitrogen or a mixture of FR410A and
nitrogen.
IM 962-4 • AIR-COOLED SPLIT SYSTEM CONDENSERS 16 www.DaikinApplied.com
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Quick Reference Guide for R410A
• R410A refrigerant operates at approximately 60% higher
pressure (1.6 times) than R22. Ensure that servicing
equipment is designed to operate with R410A.
• R410A refrigerant cycles are pink in color.
• R410A, as with other HFC’s is only compatible with POE
oils.
• Vacuum pumps will not remove moisture from oil.
• R410A systems are to be charged with liquid refrigerants.
Prior to March 1999, R410A refrigerant cylinders had
a dip tube. These cylinders should be kept upright for
equipment charging. Post March 1999 cylinders do not
have a dip tube and should be inverted to ensure liquid
charging of the equipment.
• Do not install a suction line lter drier in the liquid line.
• A liquid line lter drier is standard on every unit. Only
manufacturer approved liquid line lter driers can be
used. These lter driers are rated for minimum working
pressure of 600 psig.
• Desiccant (drying agent) must be compatible for POE oils
and R410A.
Replacement Units
To prevent failure of a new condensing unit, the existing
evaporator tubing system must be correctly sized and cleaned
or replaced. Care must be exercised that the expansion device
is not plugged. For new and replacement units, a liquid line
lter drier should be installed and refrigerant tubing should be
properly sized. Test the oil for acid. If positive, a suction line
lter drier is mandatory.
Important: When replacing an R22 unit with an R410A unit,
either replace the line set or ensure that the existing line set is
thoroughly cleaned of any old oil or debris.
Evaporator Coil
Refer to evaporator coil manufacturer’s installation instructions.
Important: The manufacturer is not responsible for the
performance and operation of a mismatched system, or for a
match listed with another manufacturer’s coil.
CAUTION
Only use evaporators approved for use on R410A systems. Use of existing
R22 evaporators can introduce mineral oil to the R410A refrigerant forming
two different liquids and decreasing oil return to the compressor. This can
result in compressor failure.
Evacuation and Charging
The evacuation of any system component that has been
exposed to atmosphere or lost its charge is essential before
charging. Never attempt to operate a system while it is under a
vacuum.
NOTE: The condensing unit is shipped with a holding charge
of dry nitrogen which must be purged from the unit
before evacuation.
1. Since the condensing unit itself must be evacuated, open
the vapor, discharge and liquid shut-o󰀨 valves.
2. Use a refrigeration type vacuum pump capable of
evacuation in the 500 micron range.
3. Connect the vacuum pump to the service manifold
assembly with a pressure gauge that will read 30 inches
vacuum. Connect the service manifold to the vapor line
service port. (“Low” shown on label.)
4. With an accurate scale, 1/2 oz., set refrigerant tank up so
its weight can be measured while in a position to charge
liquid. (Unit must be OFF.) Energize liquid line solenoid
valve by wiring valve to 24V power supply (or open by
manual stem if applicable).
5. Connect to the liquid line service port. (“High” shown
on label.) Shut o󰀨 tank and evacuate the system. The
pressure gauge should read at least 29.5” of vacuum.
6. Triple evacuate the system.
7. The refrigerant system will now be free of
noncondensables.
8. Remove vacuum pump from 3-way valve.
9. Install refrigerant tank (liquid charging) to liquid line
service valve.
10. Before tightening, purge tank and service valve hose.
11. Note weight of refrigerant tank.
12. De-energize liquid line solenoid valve. Open refrigerant
tank valve. Allow pressure in tank and unit to equalize.
13. Close o󰀨 service valve to liquid line service port and note
weight of refrigerant tank.
14. Position tank for gas charging.
15. Rewire liquid line solenoid to thermostat control.
Close main disconnect switch and turn thermostat to
lowest setting.
16. Charge unit per Table 12 and Table 13.
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17. Adjust refrigerant charge to obtain pressures indicated
in the temperature/pressure Charging Charts starting on
page 21.
18. Note weight of refrigerant tank.
19. When system has stabilized, check superheat at the
suction line service valve. The actual line temperature
should be 8° to 20°F higher than the saturation
temperature corresponding to the vapor pressure.
If superheat is measured at evaporator, the actual
line temperature should be 6° to 10° higher than the
saturation temperature corresponding to the vapor
pressure.
20. Close service ports on vapor and liquid valves. Remove
service gauges.
21. Replace service port caps and valve stem caps. These
caps must be replaced to prevent leaks.
22. Record total charge quantity on rating plate.
Final Leak Testing
After the unit has been properly evacuated and charged, a
halogen leak detector should be used to detect leaks in the
system. All piping within the condensing unit, evaporator, and
interconnecting tubing should be checked for leaks. If a leak is
detected, the refrigerant should be recovered before repairing
a the leak. The Clean Air Act prohibits releasing refrigerant into
the atmosphere.
Table 14: Charging Hints
Symptom Possible Cause Remedy
High head pressure
Air ow to/from condenser restricted or dirty condenser Remove obstruction, relocate condensing unit,
if necessary clean condenser
Faulty condenser fan or motor Replace
Overcharge of refrigerant Reduce charge
Air in system Evacuate and recharge
Low head pressure Short of refrigerant Check for leak, add charge
Low evaporator air ow Increase blower speed, check lters
Low vapor & hot compressor Short of refrigerant Check for leak—add refrigerant
Excessive sweating Low indoor airow Increase speed of air handler blower or reduce restriction,
replace air lter
Excess refrigerant Slowly reduce charge
Table 15: Pre-Start Check
1Is the condensing unit properly located and level?  Yes  No
2Is there free air movement to and from the condensing unit?  Yes  No
3Is the wiring connected according to the unit wiring diagram?  Yes  No
4Are the wiring connections tight (including those in the unit and compressor electrical box)?  Yes  No
5Is the unit properly grounded?  Yes  No
6Is the circulating air blower correctly wired?  Yes  No
7Is the condensing unit properly fused?  Yes  No
8Is the thermostat level, correctly wired and in a good location?  Yes  No
9Is the ductwork correctly sized, run, taped and insulated?  Yes  No
10 Is the refrigerant tubing neatly run and the vapor line thoroughly insulated?  Yes  No
11 Is the condensate drain properly sized, run, trapped and pitched?  Yes  No
12 Are the refrigerant connections tight and leak tested?  Yes  No
13 Are the lters clean and in place?  Yes  No
14 Does the condenser fan turn freely without rubbing?  Yes  No
15 Is the fan blade tight on the fan shaft?  Yes  No
16 Areall covers and access panels in place to prevent air loss?  Yes  No
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Accessory Installation
Louvered Panels
1. Remove two screws from top panel where louver will
install.
2. Slide top of louver panel under lip of the top panel and
slide into place.
3. Attach with four screws provided.
Figure 16: Louver Removal
Optional Service Valve
1. Remove clamp securing suction line ext. tube (if
applicable).
2. Remove connector panel “A”.
3. Remove suction line ext. tube by sweating at reducer/
suction line “B” (reducer required on some models and
remains on suction line). Remove excess braze material
from surface.
4. Slide service valve “C” onto reducer/suction line “B” (DO
NOT braze at this time).
5. Install connector panel “A”.
6. Install bracket “D”.
7. Braze valve.
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Maintenance and Operation
NOTICE
Refrigerant Piping: A qualied Architect or Systems HVAC Design
Engineer familiar with refrigerant piping design, as well as local codes
and regulations, must provide refrigerant piping design. The following
manufacturer recommendations serve as a general guide and should not
replace a qualied professional’s refrigerant piping system design.
NOTICE
Chilled Water Piping: A qualied Architect or Systems HVAC Design
Engineer familiar with piping design, local codes and regulations, must
provide piping design. The following manufacturer recommendations serve
as a general guide and should not replace a qualied professional’s piping
system design.
• All access panels must be in place when unit is in
operation.
• For maximum e󰀩ciency, the condenser coil must be
kept clean. Periodic inspections, depending on local
conditions are recommended. If it is necessary to clean
the condenser coil, use a common garden hose.
• Never operate the unit without filters installed in the air
handler.
Crankcase Heaters
All units are equipped with crankcase heaters that are factory
wired to operate whenever the main power supply to the
unit is “ON” and compressors are “OFF”. Before starting the
equipment after prolonged shutdown or at the time of initial
start-up, be sure that the circuits to the condensing units are
closed for at least 24 hours.
Contactor
The contactor is an electrical switch which operates the
compressor and condenser fans. Relay activates contactor
when safety circuit is made.
High Pressure Switch (HPC)
Opens the contactor circuit on high refrigerant pressure -
Manual Reset - check for cause of tripping before putting unit
back in service.
WARNING
Do not wire around the high pressure switch. 15 ton unit compressors
are not provided with internal pressure relief means. Failure to follow this
warning can cause an explosion resulting in personal injury or death.
Low Pressure Switch (LPC)
Acts as safety against loss of refrigerant.
Relay (R)
Energizes the compressor contactor when safety circuit is made.
Replacement Parts
To nd your local Daikin Applied Certied Parts Distributor, go
to www.DaikinApplied.com and select Parts Locator.
Charge Information
Refer to the appropriate Charging Charts starting on page 21.
Wiring Diagrams
Refer to the appropriate Wiring Diagrams starting on page 27.
Troubleshooting
Refer to the troubleshooting chart Table 15 on page 18.
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