Daikin DAR Series User manual

IMPORTANT NOTE:
DAR models are suitable for Upflow and Horizontal
Installations only. Do not use for Downflow Installations.
IOD-4010
6/2013
INSTALLATION INSTRUCTIONS
Our continuing commitment to quality products may mean a change in specifications without notice.
©2013
5151 San Felipe St., Suite 500, Houston, TX 77056
www.daikincomfort.com
DAR SERIES
COMMERCIAL AIR HANDLERS
ATTENTION INSTALLING PERSONNEL:
Priortoinstallation,thoroughlyfamiliarizeyourselfwiththis
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.
RECOGNIZETHISSYMBOL
ASA SAFETY PRECAUTION.
Index
Important Safety Instructions ..............................................2
Product Identification..........................................................3
Product Description .............................................................3
Unit Inspection ....................................................................3
Codes & Regulations ............................................................3
Replacement Parts...............................................................3
Pre-Installation Instructions.................................................3
Location...............................................................................4
Ductwork.............................................................................4
Supply Ductwork and Flanges............................................4
Return Ductwork ...............................................................4
Return Air Filters ...............................................................4
Electric Heat ........................................................................4
Electrical Supply Wire and MOP...........................................5
Building Electrical Service Inspection .................................5
Wire Sizing........................................................................6
Maximum Overcurrent Protection (MOP) ..........................6
Conversion 0f 460 ElectricalPower Supply .........................7
Electrical Connections..........................................................7
Supply Voltage..............................................................7
Air Handler Only (Non-Heat Kit Models) .......................7
Heater Kit Models .........................................................7
Low Voltage Connections ..............................................8
Heat Kit Installation .............................................................8
Refrigerant Lines..................................................................8
Tubing Preparation ...........................................................9
Post Brazing ......................................................................9
Piping Size.........................................................................9
Evaporator Coil TXV ...........................................................10
Airflow...............................................................................10
Belt Tension ....................................................................... 10
Regular Maintenance.........................................................11
Wiring Diagram.................................................................. 12

2
Important Safety Instructions
Thefollowingsymbolsandlabelsareusedthroughoutthismanual
toindicateimmediateorpotentialsafetyhazards. Itistheowner’s
and installer’s responsibility to read and comply with all safety in-
formation and instructions accompanying these symbols. Failure
to heed safety information increases the risk of personal injury,
property damage, and/or product damage.
HIGH VOLTAGE!
Failure to do so may cause property damage,
personal injury or death.
Disconnect ALL power before servicing.
Multiple power sources may be present.
Installation and repair of this unit should be performed
by individuals meeting (at a minimum) the
requirements of an “entry level technician” as specified
by theAir-Conditioning, Heating and Refrigeration
Institute (AHRI). Attempting to install or repair this unit
without such background may result in product
damage, personal injury or death.
ONLY
This product is factory-shipped for use with 208-
230/3/60 electrical power supply. However, the
airhandler can be reconfigured to operate with a
460/3/60 power supply, provided the conversion noted
in section “Conversion to 460 Electrical Supply”
section of this manual is performed.
To avoid property damage, personal injury or death
due to electrical shock, this unit MUST have an
electrical ground. The
electrical ground circuit may consist of an
appropriately sized electrical wire connecting the
ground lug in the unit control box to the building
electrical service panel.
Other methods of grounding are permitted if performed
in accordance with the National Electric Code
(NEC)/American National Standards Institute
(ANSI)/National Fire Protection Association (NFPA) 70
and local/state codes. In Canada, electrical grounding
is to be inaccordance with the Canadian Electric Code
(CSA) C22.1.
uninterrupted, unbroken
This airhandler is designed for Upflow or Horizontal-
Left applications. DO NOT INSTALL IN THE
DOWNFLOW OR HORIZONTAL-RIGHT ORIENTATION.
When installing or servicing this equipment, safety
clothing, including hand and eye protection, is
strongly recommended. If installing in an area that has
special safety requirements (hard hats, etc.), observe
these requirements.
Do not connect to or use any device that is not design-
certified by Daikin for use with this unit. Serious
property damage, personal injury, reduced unit
performance and/or hazardous conditions may result
from the use of such non-approved devices.
To prevent the risk of property damage, personal
injury, or death, do not store combustible materials or
use gasoline or other flammable liquids or vapors in
the vicinity of this unit.
CARBON MONOXIDE POISONING HAZARD
-
Special Warning for Installation of Furnace or Air Handling Units in
Enclosed Areas such as Garages, Utility Rooms or Parking Areas
Carbon monoxide producing devices (such as an automobile, space
heater, gas water heater, etc.) should not be operated in enclosed areas
such as unventilated garages, utility rooms or parking areas because of
the danger of carbon monoxide (CO) poisoning resulting from the exhaust
emissions. If a furnace or air handler is installed in an enclosed area such
as a garage, utility room or parking area and a carbon monoxide producing
device is operated therein, there must be adequate, direct outside
ventilation.
This ventilation is necessary to avoid the danger of CO poisoning which
can occur if a carbon monoxide producing device continues to operate in
the enclosed area. Carbon monoxide emissions can be (re)circulated
throughout the structure if the furnace or air handler is operating in any
mode.
CO can cause serious illness including permanent brain damage or death.
B10259-216

3
Product Identification
DAR Nominal Cooling Capacity
Model Series
DAR
0904 - 90,000 Btuh (7 1/2 Tons)
1204 - 120,000 Btuh (10 Tons)
Product Description
WhenmatchedwithDX11andDZ11condensers,thissystemcom-
plies with the minimum efficiency requirements found in ASHRAE
90.1-2007. See the Daikin DX11 and DZ11 specification sheets for
details on these condensers. For other Daikin condenser(s) that
can be matched with this airhandler to obtain ASHRAE 90.1-2007
compliance, consult with your local distributor.
The DAR series is intended for use with a room thermostat. This
thermostat is not supplied with this equipment. Only thermostats
that use 24 VAC control circuitry are to be used.
DAR0904 DAR1204
Net Weight (Lbs.) 375 400
Shipping Weight (Lbs.) 405 430
Refrigerant R-410A R-410A
Blower Wheel (Dia x Width) 11X10 11X10
Blower Wheel Quantity 2 2
Motor Type Belt Drive Belt Drive
Motor Qty 1 1
Motor (HP) 1 1/2 2
Motor (RPM) 1750 1750
Motor Sheave Type
Motor Sheave Diameter (in) 1.9" - 2.9" 2.8" - 3.8"
Blower Wheel Pulley Type
Blower Wheel Pulley Dia (in) 5.9 5.9
Evaporator Coil Material
Face Area (Ft2)8.9 10.0
Number of Rows 4 4
Suction Line Quantity 1 2
Suction Line Connection (in) * 1 1/8 1 1/8
Liquid Line Quantity 1 2
Liquid Line Connection (in)* 5/8 3/8
Metering Device
TXV Type
TXV Quantity 1 2
*Note: Consult with the condenserspecifications for suction and liquid
line sizing.
Adjustable Variable Pitch
Fixed Diameter
Copper Tubes / Al Fins
Thermal Expansion Valve (TXV)
Non-adjustable (factory installed)
Unit Inspection
Upon delivery, the unit is to be inspected for damage. Any dam-
age must be reported immediately to the carrier. Do not install
this equipment if it is determined that the integrity or safety has
been compromised by freight damage.
Using the table “Model Identification” section check the equip-
ment model number to ensure the unit is appropriately sized for
the condenser unit(s).
If an incorrect unit is supplied it must not be installed and it is to
be returned to the supplier. The manufacturer assumes no re-
sponsibility for the installation of incorrect delivered units.
The evaporator coil contains a high-pressure inert gas holding
charge.
Codes & Regulations
This product is designed and manufactured to comply with na-
tional codes. Installation in accordance with such codes and/or
prevailing local codes/regulations is the responsibility of the in-
staller. The manufacturer assumes no responsibility for equip-
ment installed in violation of any codes or regulations.
The United States Environmental Protection Agency (EPA) has
issued various regulations regarding the introduction and dis-
posal of refrigerants. Failure to follow these regulations may
harm the environment and can lead to the imposition of sub-
stantial fines. Should you have any questions please contact the
local office of the EPA.
Replacement Parts
When reporting shortages or damages, or ordering repair parts,
givethe completeproduct modeland serialnumbers asstamped
ontheproduct. Replacementpartsforthisproduct areavailable
through your contractor or local distributor. For the location of
your nearest distributor consult the white business pages, the
yellow page section of the local telephone book or contact:
CONSUMER AFFAIRS
DAIKIN NORTH AMERICA LLC
7401 SECURITY WAY
HOUSTON, TEXAS 77040
855-770-5678
If replacing an air handler, the system must be manufacturer ap-
provedandAir-Conditioning, Heating,and RefrigerationInstitute
(AHRI) matched. NOTE: Installation of unmatched systems is
strongly discouraged.
Pre-Installation Instructions
Carefully read all instructions for the installation prior to install-
ingproduct.Makesureeachsteporprocedureisunderstoodand
any special considerations are taken into account before starting
installation. Assemble all tools, hardware and supplies needed
to complete the installation. Some items may need to be pur-
chased locally. Make sure everything needed to install the prod-
uct is on hand before starting.

4
Location
NOTE: Airhandlers are designed for indoor installation only.
When installing this airhandler in an enclosed area, such as a ga-
rage/parking area, as with any carbon monoxide producing de-
vice(i.e.andautomobile,spaceheater,waterheater,etc.),insure
that the area is properly ventilated.
TheDARairhandlerissuitableforinstallationinmultiplelocations
including:
* Overhead (attic/mezzanine, etc.)
* Closet/mechanical room
Wheninstallingthisairhandler,considerationistobegiventomini-
mize the length of refrigerant tubing. Also, do not install the
airhandlerin a location either above or below the condenser that
violates the instructions provided with the condenser.
The clearance from a combustible surface to the unit may be 0".
However, service clearance is to take precedence. In addition al-
low a minimum of 36" in front of the unit for service clearance.
Allowsufficient clearance to remove the heater elements for ser-
vice or replacement in heat kits when utilized in application.
When installing in an area directly over a finished ceiling (such as
an attic), an emergency drain pan is required directly under the
unit. See local and state codes for additional requirements.
Wheninstallingthis unit inan area thatmaybecome wet,elevate
the unit with a study, non-porous material.
In installations that may lead to physical damage (warehouse, in-
dustrial sites, etc.), it is advised to install a protective barrier to
prevent such damage.
Ductwork
ThisDAR air handler is designed for acomplete supply and return
ductwork system.
Do not operate this product without all the ductwork
attached.
Toensurecorrectsystemperformance,theductworkistobesized
to accommodate 375-425 CFM per ton of cooling with the static
pressurenottoexceed.5"WC.Inadequateductworkthatrestricts
airflow can result in improper performance and compressor or
heater failure. Ductwork is to be constructed in a manner that
limitsrestrictions andmaintains suitableair velocity. Ductwork is
to be sealed to the unit in a manner that will prevent leakage.
Supply Ductwork and Flanges
Thesupply ductwork flanges are shipped loose and required
to be field installed. See the following sketch for further
details: Dimensions are approximately 40" x 13-1/8".
Return Ductwork
DO NOT TERMINATE THE RETURN DUCTWORK IN AN AREA THAT
CANINTRODUCETOXIC,OROBJECTIONABLEFUMES/ODORSINTO
THE DUCTWORK. The return ductwork is to be introduced into
the air handler bottom (upflow configuration). The cabinet di-
mensions are 48” x 24”.
Return Air Filters
Each installation must include a return air filter. This unit is fac-
tory equipped with disposable return air filters. To ensure opti-
mum performance, frequent filter replacement is advised. See
the following table for the factory installed filter sizes.
Model Filter Size (in) Qty.
DAR0904 16 x 20 x 2 4
16 x 20 x 2 2
20 x 20 x 2 2
DAR1204
Electric Heat
Refertothismanualincombinationwiththeinstructionsprovided
with the heat kit for the correct installation procedure.
The electrical characteristics of the airhandler, the electric heat
kit, and the building power supply must agree.
Theairhandlerslistedinthismanualdonothave factory installed
electric heat. Electric heat is available as an accessory. If install-
ing this option, the ONLY heat kits that can be used are the AHKD
series.
AHKD MODEL
NUMBER NOMINAL KW ELECTRICAL CHARACTERISTICS STAGES
AHKD15-3 15 208-230/3/60 1
AHKD15-4 15 460/3/60 1
AHKD20-3 20 208-230/3/60 2
AHKD20-4 20 460/3/60 2
AHKD30-3 30 208-230/3/60 2
AHKD30-4 30 460/3/60 2
For all supply voltages, use the correction factors in the following
tables, multiplied by KW and (or) temperature rise to have cor-
rected results.

5
Supply Voltage 240 230 220 210 208
Correction Factor 1 0.92 0.84 0.77 0.75
Supply Voltage 480 460 440 415 380
Correction Factor 1 0.92 0.84 0.75 0.63
KW Correction Factors (-3 Models)
KW Correction Factors (-4 Models)
The heating mode temperatures rise is dependent upon the sys-
temairflow,thesupplyvoltage,andtheheatkitsize(KW)selected.
Use the following table to determine the temperature rise (°F).
Heat Kit
KW CFM 208 240 480
2800 14 19 19
2900 14 18 18
3000 13 18 18
3100 13 17 17
3200 12 17 17
2800 19 25 25
2900 18 24 24
3000 18 24 24
3100 17 23 23
3200 17 22 22
2800 28 38 38
2900 27 37 37
3000 27 35 35
3100 26 34 34
3200 25 33 33
DAR0904
15
20
30
DAR0904 Temperature Rise Table (Degrees F)
Supply Voltage
Airhandler
Heat Kit
KW CFM 208 240 480
3800 10 14 14
3900 10 14 14
4000 10 13 13
4100 10 13 13
4200 9 13 13
3800 14 19 19
3900 14 18 18
4000 13 18 18
4100 13 17 17
4200 13 17 17
3800 21 28 28
3900 20 27 27
4000 20 27 27
4100 19 26 26
4200 19 25 25
DAR1204 Temperature Rise Table (Degrees F)
DAR1204
15
20
30
Airhandler Supply Voltage
NOTE: The preceding table is calculated with both stages of elec-
tricheatengaged(2stageheatsystems). Forsystemsusingstaged
electric heat, divide the temperature rise from the table by 2 for
1st stage operation.
Electrical Supply Wire and MOP
FIRE HAZARD!
To avoid the risk of property damage, personal injury
or fire, use only copper conductors.
HIGH VOLTAGE!
Failure to do so may cause property damage,
personal injury or death.
Disconnect ALL power before servicing.
Multiple power sources may be present.
HIGH VOLTAGE!
To avoid property damage, personal injury or death
due to electrical shock, this unit MUST have an
electrical ground. The
electrical ground circuit may consist of an
appropriately sized electrical wire connecting the
ground lug in the unit control box to the building
electrical service panel.
Other methods of grounding are permitted if performed
in accordance with the National Electric Code
(NEC)/AmericanNational Standards Institute
(ANSI)/National Fire Protection Association (NFPA) 70
and local/state codes. In Canada, electrical grounding
is to be in accordance with the Canadian Electric Code
(CSA) C22.1.
uninterrupted, unbroken
Building Electrical Service Inspection
This unit is designed for 3-phase operation. DO NOT
OPERATE ON A SINGLE PHASE POWER SUPPLY. SEE
THEPRECEDING WARNING. Measurethe powersupply to
the unit. The supply voltage must be in agreement with the
unit nameplate power requirements and within the range
shown below:
Nominal Minimum
Supply Voltage Maximum SupplyVoltage
208 - 230 187 253
460 414 506

6
VoltageBalance Thesupplyvoltageshallbeunbalance(phase
to phase) within 2%. To calculate the percentage of voltage
unbalance use the following formula:
Percentage Max Voltage Deviation From Average
Voltage Unbalance = 100 x Average Voltage
Example . L1 – L2 = 220 V
L2 – L3 = 216 V
L1 – L3 = 213 V
Avg. Voltage = (220+216+213) / 3
= 649 / 3
= 216
Max. Deviation from Avg. = 220 – 216 = 4
% Voltage Unbalance = 100 x (4 / 216)
= 400 / 216
= 1.8%
Determine Wire Size The selection of the appropriate supply
wire size is important to the operation of the equipment.
When selecting the wire size the following are important
elements of the decision:
•The wire size is adequately sized to carry the Minimum
Circuit Ampacity (MCA). Refer to the NEC (USA) or CSA
(Canada) for wire sizing. The unit MCA for the airhandler
and the optional electric heat kit can be found on the
equipment S&R plate and the following table.
AIRHANDLER VOLTAGE HEAT KIT MCA
None 6.5
AHKD15-3 49.8
AHKD20-3 64.2
AHKD30-3 93.1
None 3.3
AHKD15-4 24.9
AHKD20-4 32.1
AHKD30-4 46.6
None 9.8
AHKD15-3 53.1
AHKD20-3 67.5
AHKD30-3 96.4
None 4.9
A
HKD15-4 26.5
A
HKD20-4 33.7
A
HKD30-4 48.2
DAR0904
208-230
460
DAR1204
208-230
460
Wire Sizing
Wire size is important to the operation of your equipment. Use
the following check list when selecting the appropriate wire size
for your unit.
•WiresizemustcarrytheMinimumCircuitAmpacity(MCA).
• Referto the NEC(USA)orCSA(Canada)forwiresizing. The
unit MCA for the air handler and the optional electric heat
kit can be found on the unit Series and Rating Plate.
•Wire size allows for no more than a 2% voltage drop from
the building breaker/fuse panel to the unit.
Refer to the latest edition of the National Electric Code or
in Canada the Canadian Electric Code when determining
the correct wire size. The following table shows the cur-
rent carrying capabilities for copper conductors rated at
75oCwith a 2%voltagedrop. Use this table determinethe
voltage drop per foot of various conductors.
Wire Size
(AWG) 10 15 20 25 30 35 40 45
14 75 50 37 NR NR NR NR NR
12 11879 59 47NRNRNRNR
10 188 125 95 75 63 54 NR NR
8 301 201 150 120 100 86 75 68
6 471 314 235 188 157 134 118 110
Minimum Circuit Ampacity (MCA)
MAXIMUM ALLOWABLE LENGTH IN FEET
TO LIMIT VOLTAGE DROP TO 2%
Based on NEC 1996
Maximum Overcurrent Protection (MOP)
Every installation must include an NEC (USA) or CEC (Canada) ap-
proved overcurrent protection device. Also, check with local or
state codes for any special regional requirements.
ProtectioncanbeintheformoffusingorHACRstylecircuitbreak-
ers. TheSeries and Rating Plate can be used as a guide for select-
ing the MAXIMUM overcurrent device or reference the following
table.
NOTE: Fuses or circuit breakers are to be sized larger than the
equipment MCA but not to exceed the MOP.
AIRHANDLER HEAT KIT MOP
None 15
AHKD15-3 50
AHKD20-3 70
AHKD30-3 100
None 15
AHKD15-4 25
AHKD20-4 35
AHKD30-4 50
None 15
AHKD15-3 60
AHKD20-3 70
AHKD30-3 100
None 15
AHKD15-4 30
AHKD20-4 35
AHKD30-4 50
DAR0904
DAR1204

7
Conversion 0f 460 Electrical Power Supply
THIS PRODUCT IS CAPABLE OF USING EITHER 208-
230/3/60 OR 460/3/60 SUPPLY VOLTAGE. THE
AIRHANDLER IS FACTORY SHIPPED FOR USE WITH
208-230/3/60 VOLTAGE. INSTALLATIONS USING
460/3/60 REQUIRE A MODIFICATION TO THE MOTOR
AND TRANSFORMER ELECTRICAL CIRCUIT.
OPERATE THIS APPLIANCE USING A 460V POWER
SUPPLY UNLESS THIS MODIFICATION HAS BEEN
MADE. FAILURE TO OBSERVE THIS WARNING MAY
RESULT IN PERSONAL INJURY, EQUIPMENT
DAMAGE, AND FIRE.
IT IS ADVISABLE TO PERFORM THIS CONVERSION IN
AN AREA THAT WILL PERMIT EASY ACCESSIBILITY.
DO NOT
Transformer. Thetransformerisamulti rated transformer208V,
240V, or 480V primary input. To change from the factory setting
of 230 to 460V applications remove the Orange colored wire
attachedtothe240terminalontheprimarysideofthetransformer.
Installthiswireonthetransformerterminalmarked480. Similarly,
move the Orange wire from 240 to 208 for 208V applications.
Motor Conversion This conversion requires access to the
motor electrical junction box that is located on the motor
endplate on the side opposite from the shaft. Use the
following diagrams when performing this procedure.
DAR0904 Motor
DAR1204 Motor
Electrical Connections
Supply Voltage
USE COPPER CONDUCTORS ONLY.
A single point supply voltage termination is provided in the
airhandler control box (non-heat kit models) or heat kit control
box (heat kit models). This termination is common to both the
airhandler, and if equipped, heat kit. The wire is to be sized in
accordance with the “Electrical Wire and MOP” section of this
manual.
Air Handler Only (Non-Heat Kit Models)
Supply wire is to be routed through conduit from the service dis-
connect box to the unit. The airhandler is equipped with a knock-
out suitable for ¾” conduit. The following diagram illustrates the
supply voltage hook-up.
Heater Kit Models
When a heater kit is used the system uses a single point wiring
hook-up. The supply wire is to be routed through conduit from
the service disconnect box to the heater kit. The heat kit is
equipped with a knockout suitable for ½” or ¾” conduit depen-
dent on the KW. The supply voltage is to be installed on the ter-
minal block located in the heater kit control box.

8
The heater kit is factory equipped with the supply and low volt-
age wires for the airhandler. The low voltage connection from
theheaterkitisprovidedthroughamulti-pinplugwhichconnects
to a mating plug in the airhandler. The high voltage connections
aretobemadeattheairhandlercontactor.These wiresaretobe
routed through the pipe nipples supplied with the heater kit as
shown in the following illustration:
LOW VOLTAGE
WIRES
HIGH VOLTAGE
WIRES
Low Voltage Connections
The 24V-control voltage connects the airhandler to the room
thermostat and condenser. For systems using staged electric
heat,thethermostatistohaveW1andW2functions. Lowvoltage
wiringis tobe copperconductors, andbe aminimum of18AWG.
Aprovisiononthecabinetsidetoacceptthelowvoltagewiringis
provided. See the following drawings for typical low voltage
connections.
NoHeat- Single StageCooling where R… Red,G…Green,
BL….Blue Notewhitewireandbrownwirearenotusedandare
to be taped.
Single Stage Heat - Single Stage Cooling where R… Red, W…
White,G…Green,BL….Blue Notebrownwireisnotusedandis
to be taped.
TwoStageHeat–SingleStageCooling-whereR…Red,W…White,
BR… Brown,G… Green, BL…. Blue
Heat Kit Installation
Inspect for Shipping Damage. The heat kit is an optional acces-
sory that is shipped separately from the air handler. Inspect the
heat kit for damage and report any damage to the carrier and/or
distributor. Do not install this accessory if it is determined that
the integrity or safety has been compromised by freight damage.
Check the Nameplate. From the heat kit nameplate check the
following:
· Themodelnumberagreeswiththeapprovedmodels(seethe
“Electric Heat” section of this manual).
· The correct size (kW)
· Electric characteristics, voltage and phase, agree with the
building electrical supply.
Attaching the Heat Kit The heat kit attaches directly to the top
panel(when viewed in the upflow position) ofthe airhandler. Do
not screw the heat kit into the duct flanges. See the following
drawing for details:
The wires from the heat kit are to be routed through the pipe
nippleintotheair handler electricalcompartment. Seethe “Elec-
trical Connection” section of this manual for wiring details.
Refrigerant Lines
This product is factory-shipped under pressure. Follow
these instructions to prevent injury.

9
A quenching cloth is strongly recommended to prevent
scorching or marring of the equipment finish when
welding close to the painted surfaces. Use brazing
alloy of 5% minimum silver content.
Tubing Preparation
All cut ends are to be round, burr free, and clean. Failure to fol-
low this practice increases the chances for refrigerant leaks. The
suction line is spun closed and requires pipe cutters to remove
the closed end.
Post Brazing
Quench all welded joints with water or a wet rag.
Piping Size
For the correct tubing size, follow the specification for the con-
denser/heat pump.
The DAR0904 coil is circuited to accept a single suction and liquid
line. The DAR1204 evaporator coil has (2) suction lines and (2)
liquid lines. When using a single outdoor unit with the DAR1204,
it is necessary to manifold the suction lines into a single connec-
tion. Similarly,theliquidlinesoftheDAR1204aretobemanifolded
when matched with a single condenser/heat pump. See the fol-
lowing sketch for additional details.
Applying too much heat to any tube can melt the tube. Torch
heat required to braze tubes of various sizes must be
proportional to the size of the tube. Service personnel must
use the appropriate heat level for the size of the tube being
brazed.
CAUTION
TO SUCTION VALVE
OUTDOOR UNIT
TO LIQUID VALVE
OUTDOOR UNIT
DAR0904
TO SUCTION VALVE
OUTDOOR UNIT
TO LIQUID VALVE
OUTDOOR UNIT
DAR1204 SINGLE OUTDOOR UNIT
Note: The resulting manifolds are to be sized to accept the suc-
tion and liquid line diameters prescribed within the condenser
Installation Manual.
Multiple Condensers The DAR1204 can accept (2) condensers/
heat pumps. When using two condensers use the following pip-
ing procedure:
TO SUCTION VALVE
#1 OUTDOOR UNIT
TO SUCTION VALVE
#2 OUTDOOR UNIT
TO LIQUID VALVE
#1 OUTDOOR UNIT
TO LIQUID VALVE
#2 OUTDOOR UNIT
DAR1204 TWO OUTDOOR UNITS
IMPORTANT NOTE: Torchheat 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
addingbrazingalloy.Applyingtoomuchheattoanytubecanmelt
the tube. Service personnel must use the appropriate heat level
for the size of the tube being brazed.
NOTE: The use of a heat shield when brazing is recommended to
avoid burning the serial plate or the finish on the unit. Heat trap
or wet rags should be used to protect heat sensitive components
such as service valves and TXV valves.

10
Evaporator Coil TXV
Note:ThermalExpansionValve(TXV)Bulbisnotpermanentlycon-
nected to the suction from the factory. After suction and liquid
line tubing is brazed in the field, the TXV bulb must be attached
andinsulationto the suctionline(s) inside thecabinet at the10 or
2 o’clock position. This location will be different depending on
the orientation of the unit, vertical or horizontal. Always locate
the TXV bulb on the top of the suction tube at 10 or 2 o’clock.
Check condensing unit / heat pump instructions for charging
method.
Airflow
The blower uses a belt drive motor that has an adjustable
sheave. Thefactorysettingfor theDAR0904is2 turns open
and the DAR1204 is 3 turns open.
To increase the airflow:
•Remove the blower belt
•Loosen the set screw as shown below
•Withthesheavestationary-rotatetheotherhalfclockwise
(screw in).
•Tighten the set screw
•Reinstall the belt
Todecreasetheairflowperformthesameasabovebutrotate
the sheave counterclockwise (screw out).
The following table can be used as guide for system airflow:
Static
Pressure 12345
0.1 4264 3930 3633 3273
0.2 3996 3705 3325 2998
0.3 3731 3379 3002 2517
0.4 3445 3066 2613 -
0.5 3113 2662 - -
DAR0904
Sheave Turns Open
Static
Pressure01234 5
0.1 5193 5037 4790 4529 4097 4097
0.2 5012 4873 4603 4315 3842 3842
0.3 4852 4675 4393 4091 3589 3589
0.4 4687 4484 4172 3853 3295 3073
0.5 4501 4268 3939 3561 2922 2610
0.6 4293 4041 3673 3223 2642 -
0.7 4073 3782 3347 2892 - -
0.8 3807 3485 2962 - - -
0.9 3540 3117 - - - -
DAR1204
Sheave Turns Open
Belt Tension
Thebelttensionistobecheckedatthetimeofinstallationand
after a “run in” period of about 24 hours. To perform the
measurement, it is suggested that a “Belt Tension Gauge”
(availablefrom mostbelt manufacturers) be used. The force
required to deflect the belt 1/8" (at the midpoint) should be
between 3 ½ and 5 pounds.