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INSTALLATION MANUAL
MULTI-ZONE HEAT PUMP OUTDOOR UNIT
DRA3U18M2A, DRA3H18M2A, DRA4U28M2A, DRA4H28M2A,
DRA5U36M2A, DRA5H36M2A, DRA6U48M2A DRA6H48M2A,
DRA6U60M2A, DRA6H55M2A
R-454B 208/230V 1ph 60 HZ
Model Number:
Serial Number:
Purchase Date:
Installing Contractor Company Name:
TIP
Capture relevant information about your Durastar mini-split equipment before it is
installed and write it above for future reference.
R
DURASTAR.COM
1
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Summary of Contents for DURASTAR DRA3U18M2A
- Page 1 DRA5U36M2A, DRA5H36M2A, DRA6U48M2A DRA6H48M2A, DRA6U60M2A, DRA6H55M2A R-454B 208/230V 1ph 60 HZ Model Number: Serial Number: Purchase Date: Installing Contractor Company Name: Capture relevant information about your Durastar mini-split equipment before it is installed and write it above for future reference. DURASTAR.COM...
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Page 2: Table Of Contents
• Read the troubleshooting section of this manual as it will help you diagnose and solve common issues. • Visit us on the web at WWW.DURASTAR.COM to download product guides and up-to-date information. • If you need warranty service, our friendly customer service representatives are available via email at QUESTIONS@DURASTAR.COM or by telephone at 1-888-320-0706. -
Page 3: Symbols Used In This Manual
NOTE: The pencil indicates any manufacturer notes relating to surrounding content. These may include further clarifications or call-outs. TIP: A light bulb symbol indicates suggested manufacturer tips for the user to get the most out of the Durastar equipment and to accommodate the best user experience. R-454B WARNING:... -
Page 4: Important Safety Precautions
Do not operate your air conditioner in a wet room such as a bathroom or laundry room. Too much exposure to water can cause electrical components to short circuit. • If the air conditioner is used together with burners or other heating devices, thoroughly ventilate the room to avoid oxygen deficiency. DURASTAR.COM... - Page 5 For units that have an auxiliary electric heater, do not install the unit within 3 feet (1 meter) of any combustible materials. • Do not install the unit in a location that may be exposed to combustible gas leaks. If combustible gas accumulates around the unit, it may cause a fire. DURASTAR.COM...
- Page 6 When the refrigerant sensor malfunctions, the indoor unit will display the error code “FHCC”. The refrigerant sensor can not be repaired and can only be replaced by the manufacturer. It shall only be replaced with the sensor specified by the manufacturer. DURASTAR.COM...
- Page 7 All training shall follow the ANNEX HH requirements of UL 60335-2-40 4th Edition. Examples for such working procedures are: • breaking into the refrigerating circuit; • opening of sealed components; • opening of ventilated enclosures. DURASTAR.COM...
- Page 8 The following procedure shall be adhered to: • safely remove refrigerant following local and national regulations; evacuate; • purge the circuit with NITROGEN • evacuate (requirement); • continuously flush or purge with NITROGEN when using flame to open circuit; and • open the circuit DURASTAR.COM...
- Page 9 Do not climb onto or place objects on top of the outdoor unit. • Do not allow the air conditioner to operate for long periods of time with doors or windows open, or if the humidity is very high. DURASTAR.COM...
- Page 10 : the height of the bottom of the appliance relative to the floor of the room Definitions inst after installation ft (m) WARNING: The minimum room area or the minimum room area of conditioned space is based on releasable charge and total system refrigerant charge. DURASTAR.COM...
- Page 11 The DRA2U18M2A is the only Durastar multi-zone unit NOT equipped with a SAFETY SHUT-OFF VALVE. The SAFETY SHUT-OFF VALVE will default to fully closed when the unit is de-energized so refrig- erant could remain in the system if not properly released before servicing.
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Page 12: Specification Overview
Regularly inspect and clean air filters. NOTE Your Durastar air conditioner's outdoor unit is equipped with a base pan heater, allowing it to continue to operate at freezing temperatures as low as -22°F (-30°C). When outdoor air temperatures are at or below 32°F (0°C), we strongly recommend keeping the unit plugged in at all times to ensure smooth ongoing performance. -
Page 13: Accessories
• Flaring tool • Suspension bolts and necessary hardware to • Burr reamer hang indoor unit (if necessary) • Crescent or spanner wrench • Wiring u-lugs • Hexagonal wrench set • Torque wrench • Wire strippers • Wire crimper DURASTAR.COM... -
Page 14: Parts Identification
The installation must be performed in accordance with the required local and national standards. The installation may be slightly different in different areas. DRA6H48M2A, DRA6U48M2A, DRA6H55M2A, DRA6U60M2A DRA5H36M2A, DRA5U36M2A DRA4H28M2A, DRA4U28M2A DRA3H18M2A, DRA3U18M2A Signal Cable, Refrigerant Pipes, and Drain Pipe Air Inlets Power Supply Wiring Terminal Refrigerant Valves Air Outlet NOTE Illustrations in this manual are for explanatory purposes. -
Page 15: Outdoor Unit Installation
Install the unit at least 10 ft. (3 m) away from TV or radio antennas. Operation of the unit may interfere with antenna reception in areas where the signal is weak. An amplifier may be needed for affected devices. DURASTAR.COM... -
Page 16: Step 2: Install The Drain Joint
Twist to lock Drain hole C AUTION In cold climates, make sure that the drain hose is as vertical as possible to ensure swift water drainage. If water drains too slowly, it can freeze in the hose and flood the unit. DURASTAR.COM... -
Page 17: Step 3: Mount The Outdoor Unit
Air Inlet Air Inlet Air Outlet Front View Top View OUTDOOR UNIT DIMENSIONS MOUNTING DIMENSIONS MODEL DRA3H18M2A 37-1/4 31-7/8 16-1/8 26-1/2 15-7/8 DRA3U18M2A 35-1/16 26-1/2 13-1/2 26-1/8 13-11/16 DRA4H28M2A 37-1/4 31-7/8 16-1/8 26-1/2 15-7/8 DRA4U28M2A 37-1/4 31-7/8... - Page 18 Max. height diff. between outdoor and indoor unit 49' (15m) 49' (15m) Max. height diff. between indoor units 33' (10m) 33' (10m) Outdoor unit Indoor unit Max. Height difference Indoor unit 49’ (15m) 33’ (10m) 49’ (15m) Indoor unit DURASTAR.COM...
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Page 19: Step 4: Connect The Signal & Power Cables
8. Replace the wire cover on the side of the unit, and screw it in place. Terminal block Connecting cable Power supply cord Conduit panel Wire Cover Select the appropriate holes to feed the wires through according to their diameter. DURASTAR.COM... -
Page 20: Refrigerant Piping Connections
Perform leak check procedures. Afterwards, remove the high side hose and attach the low side hose from the manifold to evacuate all connected zones. Once a vacuum is maintained, open both master valves to release the refrigerant charge into the entire system. DURASTAR.COM... -
Page 21: Oil Traps
Indoor Unit 19’ 9” (6m) 32’ 10” (10m) Required distance between oil traps when Required distance between oil traps when the indoor unit is installed higher than the the outdoor unit is installed higher than the indoor unit. outdoor unit. DURASTAR.COM... - Page 22 Burrs can affect the airtight seal of the refrigerant piping connection and must be completely removed. 1. Hold the pipe at a downward angle to prevent burrs from falling into the pipe. 2. Using a reamer or deburring tool, remove all burrs from the cut section of the pipe. Pipe Reamer Point downward DURASTAR.COM...
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Page 23: Step 3: Flare Pipe Ends
0.04" (1.0mm) 0.07" (1.8mm) Ø 5/8" (15.9mm) 0.078" (2.0mm) 0.086" (2.2mm) Ø 3/4" (19.1mm) 0.078" (2.0mm) 0.094" (2.4mm) Flare form TIP: THICKNESS COMPARISON • 0.0275" = A Thumbnail • 0.04" = A Dime • 0.078" = A Nickle Pipe DURASTAR.COM... -
Page 24: Step 4: Connect Pipes
4. While firmly gripping the nut on the unit tubing, use a torque wrench to tighten the flare nut according to the torque values in the table on the next page. Loosen the flaring nut slightly, then tighten again. DURASTAR.COM... -
Page 25: System Evacuation
Use a vacuum pump and manifold gauge to evacuate the refrigerant system, removing any non-condensible gas and moisture from the system. Evacuation should be performed upon initial installation and if unit is relocated. DURASTAR.COM... - Page 26 Do not try to force the valves to open further. Manifold Gauge Low pressure Flare nut gauge Low pressure High pressure valve valve Low pressure hose Auxiliary hose Vacuum pump Valve body Valve stem Low pressure valve DURASTAR.COM...
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Page 27: Indoor Unit Btu Setting
ENC1 on the indoor unit board. Make sure to adjust this switch to the desired BTU capacity. If the indoor unit model number is not listed below, this step is not necessary. Refer to the multi-zone compatibility chart on Durastar.com for allowed combinations. CAUTION UNIT MUST BE POWERED OFF BEFORE ADJUSTING ROTARY SWITCH Default setting “0”... -
Page 28: Automatic Wiring & Piping Check
Indoor unit B Liquid/ Gas pipe Indoor unit A Outdoor unit Incorrect wiring Terminal block Indoor unit B Liquid/ Gas pipe Indoor unit A Outdoor unit Incorrect piping Terminal block Indoor unit B Liquid/ Gas pipe Indoor unit A Outdoor unit DURASTAR.COM... -
Page 29: Final Checks
1: Low pressure stop valve 2: High pressure stop valve 3 & 4: Indoor unit flare nuts Use the Durastar Job Site Information Sheet at the end of this manual as a commissioning report to record your start up readings. DURASTAR.COM... -
Page 30: Safety Shut-Off Valve Release
In accordance with regulations, some multi-zone outdoor units are equipped with safety shut-off valves that limit the releasable refrigerant charge when activated by a leak detection system. The DRA2U18M2A is the only Durastar multi-zone unit NOT equipped with a SAFETY SHUT-OFF VALVE. -
Page 31: Troubleshooting
The indoor unit makes A rushing air sound may occur when the louver resets its position. noises A squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction of the unit’s plastic parts. DURASTAR.COM... -
Page 32: Possible Causes
The air filter is dirty Remove the filter and clean it according to instructions The air inlet or outlet of either unit is Turn the unit off, remove the obstruction and blocked turn it back on DURASTAR.COM... - Page 33 If the problem persists, disconnect the power and contact your nearest customer error code service center. appears NOTE If your problem persists after performing the checks and diagnostics above, turn off your unit immediately and contact an authorized service center. DURASTAR.COM...
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Page 34: Wiring Diagrams
WIRING DIAGRAMS DRA3U18M2A L-PRO H-PRO DURASTAR.COM... -
Page 35: Main Control Board
CHASSIS HEATER UNIT B UNIT C HEAT_D UNIT A TEMP. SENSOR INDOOR COIL OUTLET REVERSING VALVE TEMP. SENSOR ELECTRONIC COMP. TOP OLP COMP TOP BALL VALVE TEMP. SENSOR HIGH PRESSURE XT1~4 H-PRO TERMINAL BLOCK SWITCH LOW PRESSURE L-PRO SWITCH DURASTAR.COM... - Page 36 INDOOR COIL OUTLET REVERSING VALVE TEMP. SENSOR ELECTRONIC COMP. TOP OLP COMP TOP BALL VALVE TEMP. SENSOR HIGH PRESSURE XT1~5 H-PRO TERMINAL BLOCK SWITCH Notes: LOW PRESSURE L-PRO COMP. TOP OLP TEMP. SENSOR is only for hyper heat models. SWITCH DURASTAR.COM...
- Page 37 UNIT C UNIT D UNIT E HEAT_D UNIT A TEMP. SENSOR INDOOR COIL OUTLET REVERSING VALVE TEMP. SENSOR ELECTRONIC COMP. TOP OLP COMP TOP TEMP. SENSOR BALL VALVE HIGH PRESSURE XT1~6 H-PRO TERMINAL BLOCK SWITCH LOW PRESSURE L-PRO SWITCH DURASTAR.COM...
- Page 38 COMP COMPRESSOR REVERSING VALVE HEAT_D CHASSIS HEATER TERMINAL BLOCK HEAT_Y CRANKCASE HEATER XT1~6 ECONOMIZER ECONOMIZER BRANCH INLET BRANCH OUTLET TBH-IN TBH-OUT TEMP.SENSOR TEMP.SENSOR Notes: REFRIGERANT CONDENSER TEMP. SENSOR TEMP. SENSOR EBV is only for the units with shut-off valve. DURASTAR.COM...
- Page 39 ECONOMIZER TBH-IN BRANCH INLET TEMP.SENSOR Note: XT1~7 TERMINAL BLOCK 1. EEV2, TF, T3B, TBH-OUT, TBH-IN COMP DCFAN1 DCFAN2 are only for hyper heat models. ELECTRONIC BALL VALVE 2. COMP. TOP OLP TEMP. SENSOR is only for regular heat models. DURASTAR.COM...
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Page 40: Error And Operating Codes
Inverter module (IPM) EHC3 Refrigerant sensor is out of range PC46 Compressor speed has been out of control EL 01 IDU & ODU communication error PC49 Compressor overcurrent failure EL0C System lacks refrigerant PCA1 Condensation protection of refrigerant pipe DURASTAR.COM... -
Page 41: Job Site Information Sheet
Line Voltage (Power Off): L1 to L2 _____________ L1 to G _____________ L2 to G ________________ Line Voltage (Power On): L1 to L2 _____________ L1 to G _____________ L2 to G ________________ Outdoor Thermal Readings Discharge: _________°F Ambient: _________°F DURASTAR.COM... - Page 42 (Circle Liquid and Gas Line): Electrical Readings Power/Control Wire Color: 1 _______________ 2 _______________ 3 ________________ Voltage Readings: 1-2 ___________ AC 2-3 ___________DC Thermal Readings Return Air: _________°F Supply Air: _________°F Room Air: _________°F Gas Line Saturation: _________°F Liquid Line Saturation: _________°F DURASTAR.COM...
- Page 43 (Circle Liquid and Gas Line): Electrical Readings Power/Control Wire Color: 1 _______________ 2 _______________ 3 ________________ Voltage Readings: 1-2 ___________ AC 2-3 ___________DC Thermal Readings Return Air: _________°F Supply Air: _________°F Room Air: _________°F Gas Line Saturation: _________°F Liquid Line Saturation: _________°F DURASTAR.COM...
- Page 44 Power/Control Wire Color: 1 _______________ 2 _______________ 3 ________________ Voltage Readings: 1-2 ___________ AC 2-3 ___________DC Thermal Readings Return Air: _________°F Supply Air: _________°F Room Air: _________°F Gas Line Saturation: _________°F Liquid Line Saturation: _________°F ©2025 Durastar DURASTAR.COM V1.1 0125...
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