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IO-4005

08/2022

CONTENTS

1 Important Safety Instructions

 .............................Pg. 1

2 Shipping Inspection

  ...........................................Pg. 2

3 Codes & Regulations

 ..........................................Pg. 2

4 Replacement Parts

 ..............................................Pg. 2

5 Pre- Installation Instructions

 ..............................Pg. 2

5.1 Preparation ......................................................Pg. 2

5.2 System Matches ..............................................Pg. 2

5.3 Interconnecting Tubing ....................................Pg. 3

6 Application Information

 ......................................Pg. 3

6.1 Wire Sizing  ......................................................Pg. 3

6.2 Maximum Overcurrent Protection (MOP)  ........Pg. 4

6.3 Electrical Connections-Supply Voltage ............Pg. 4

6.4 Fresh Air Openings  .........................................Pg. 4

7 AWST-Factory Installed TXV Models

  ................Pg. 4 

7.1 Tubing Size  .....................................................Pg. 4

7.2 Tubing Connection  ..........................................Pg. 4

7.3 Thermal Expansion Valve System Adjustment Pg. 5

8 Maintenance Check

  ............................................Pg. 5

9 Wiring Diagrams and Air Flow Data

 ...................Pg. 6

9.1 Low Voltage Connection  .................................Pg. 6

10 Trouble Shooting 

 ..............................................Pg. 11

VERTICAL MOUNT AIR HANDLERS

INSTALLATION INSTRUCTIONS & OPERATING INSTRUCTIONS

© 2022 

19001 Kermier Rd., Waller, TX  77484

www.daikinac.com

P/N: IO-4005     Date:  August 2022

WARNING

HIGH VOLTAGE

DISCONNECT ALL POWER BEFORE SERVICING 

OR INSTALLING THIS UNIT.  MULTIPLE POWER 

SOURCES MAY BE PRESENT.  FAILURE TO DO SO 

MAY CAUSE PROPERTY DAMAGE, PERSONAL 

INJURY OR DEATH.

ONLY PERSONNEL THAT HAVE BEEN TRAINED TO INSTALL, 

ADJUST, SERVICE OR REPAIR(HEREINAFTER, “SERVICE”) 

THE EQUIPMENT SPECIFIED IN THIS MANUAL SHOULD  

SERVICE THE EQUIPMENT.  THE MANUFACTURER WILL 

NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY 

DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE 

PROCEDURES.  IF YOU SERVICE THIS UNIT, YOU ASSUME 

RESPONSIBILITY FOR ANY INJURY OR PROPERTY  

DAMAGE WHICH MAY RESULT.  IN ADDITION, IN 

 

JURISDICTIONS THAT REQUIRE ONE OR MORE LICENSES 

TO SERVICE THE EQUIPMENT SPECIFIED IN THIS  

MANUAL, ONLY LICENSED PERSONNEL SHOULD SERVICE 

THE EQUIPMENT.   

IMPROPER INSTALLATION, ADJUSTMENT, SERVICING OR 

REPAIR OF THE EQUIPMENT SPECIFIED IN THIS MANUAL, 

OR ATTEMPTING TO INSTALL, ADJUST, SERVICE OR REPAIR 

THE EQUIPMENT SPECIFIED IN THIS MANUAL WITHOUT 

PROPER TRAINING MAY RESULT IN PRODUCT DAMAGE, 

PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

WARNING

WARNING

TO PREVENT THE RISK OF PROPERTY DAMAGE, PERSONAL 

INJURY, OR DEATH, DO NOT STORE COMBUSTIBLE MATERI

-

ALS OR USE GASOLINE OR OTHER FLAMABLE LIQUIDS  OR 

VAPORS IN THE VICINITY OF THIS APPLIANCE.

CAUTION

HAVE YOUR CONTRACTOR IDENTIFY ALL THE VARIOUS CUT 

OFF SWITCHESAND DEVICES THAT SERVICE THIS UNIT. 

KNOW WHERE THE SWITCH IS THAT WILL CUT OFF ENERGY 

TO THE HEATING SYSTEM IN THE EVENT OF OVERHEATING.

CAUTION

THIS APPLIANCE IS NOT INTENDED FOR THE USE BY PER-

SONS (INCLUDING CHILDREN) WITH THE REDUCED PHYSICAL, 

SENSORY OR MENTAL CAPABILITIES, OR LACK OF EXPERI

-

ENCE AND KNOWLEDGE, UNLESS THEY HAVE BEEN GIVEN 

SUPERVISION OR INSTRUCTION CONCERNING USE OF THE 

APPLIANCE BY A PERSON RESPONSIBLE FOR THEIR SAFETY. 

CHILDREN SHOULD BE SUPERVISED TO ENSURE THAT THEY 

DO NOT PLAY WITH THE APPLIANCE.

  

WARNING

THIS UNIT SHOULD NOT BE CONNECTED TO, OR USED IN 

CONJUNCTION WITH, ANY DEVICES THAT ARE NOT DESIGN 

CERTIFIED FOR USE WITH THIS UNIT OR HAVE NOT BEEN 

TESTED AND APPROVED BY THE MANUFACTURER. SERIOUS 

PROPERTY DAMAGE OR PERSONAL INJURY, REDUCED UNIT 

PERFORMANCE AND/OR HAZARDOUS CONDITIONS MAY 

RESULT FROM THE USE OF DEVICES THAT HAVE NOT BEEN 

APPROVED OR CERTIFIED BY THE MANUFACTURER.

1 Important Safety Instructions

As a professional installer, you have an obligation to know 

the product better than the customer. This includes all safety 

precautions and related items. Prior to actual installation, 

 

thoroughly familiarize  yourself  with  this  Instruction Manual. 

Pay special attention to all safety warnings.  Remember,  it  is  

your  responsibility  to  install  the product safely and to know it 

well enough to be able to instruct a customer in its safe use.
Safety is a matter of common sense...a matter of thinking  before  

acting.  Most  dealers  have  a  list  of  specific, good safety 

practices...follow them.
The precautions listed in this Installation Manual are in- tended 

as supplemental to existing practices. However, if  there  is  a  

direct  conflict  between  existing  practices and  the  content  

of  this  manual,  the  precautions  listed here take precedence.

Summary of Contents for AWST18SU14 AA Series

Page 1: ... PERSONAL INJURY OR DEATH WARNING WARNING TO PREVENT THE RISK OF PROPERTY DAMAGE PERSONAL INJURY OR DEATH DO NOT STORE COMBUSTIBLE MATERI ALS OR USE GASOLINE OR OTHER FLAMABLE LIQUIDS OR VAPORS IN THE VICINITY OF THIS APPLIANCE CAUTION HAVE YOUR CONTRACTOR IDENTIFY ALL THE VARIOUS CUT OFF SWITCHESAND DEVICES THAT SERVICE THIS UNIT KNOW WHERE THE SWITCH IS THAT WILL CUT OFF ENERGY TO THE HEATING SY...

Page 2: ...red directly from the supplier United Air Filter Charlotte NC Phone 704 334 5311 AWST 18 24 Part BT1369604 14 x 18 x 1 AWST 30 36 Part BT1369608 18 x 20 x 1 For large chassis AWST30 36 fresh air filters must be provided by contractor 5 Pre Installation Instructions 5 1 Preparation Keep this document with the unit Carefully read all instruc tions for the installation prior to installing product Mak...

Page 3: ...t may be necessary to insulate the condensate drain line located inside the building Use Armaflex or similar material NOTE If you intend to install this unit with a WAD door it must be mounted 1 4 behind front edge of stud Electrical Supply Wire and MOP INSPECTION OF THE BUILDING ELECTRICAL SERVICE This unit is designed for single phase electrical supply DO NOT OPERATE ON A THREE PHASE POWER SUPPL...

Page 4: ...ess than 1 4 at 0 5 inch H2O 6 4 Fresh Air Openings All AWST models include 4 fresh air knockouts on both sides of the cabinet To utilize simply remove the appropriate knockout and connect fresh air inlet venting directly to cabinet Ensure the unit mounting system does not block the fresh air inlet holes NOTE The installing contractor must take into account any lost capacity due to the the fresh a...

Page 5: ...f subcooling and superheat are low adjust TXV to 7 to 9 F superheat then check subcooling NOTE To adjust superheat turn the valve stem clockwise to increase and counterclockwise to decrease b If subcooling is low and superheat is high add charge to raise subcooling to 7 to 9 F then check superheat c If subcooling and superheat are high adjust TXV valve to 7 to 9 F superheat then check subcooling W...

Page 6: ...OM PRIMARY AND SECONDARY DRAINS CAN BE ACCESSED THROUGH THE BOTTOM OF THE UNIT 3 4 NPT FEMALE CONNECTION NOTE HAND TIGHTEN ONLY SUCTION LINE SMALL CHASSIS REMOVABLE SERVICE DOOR LIQUID LINE R G W C Thermostat Air Handler Condensing Unit 18 Gauge 24 VAC 18 Gauge 24 VAC Y R G W C Y Y Note Connect T2 T3 or T4 to the Y terminal to the outdoor unit See Table below for correct CFM selection Note Tape th...

Page 7: ...6 823 800 777 756 T1 683 604 525 460 369 T2 900 856 803 734 681 T3 1079 1025 989 949 889 T4 944 897 848 783 733 T5 1168 1127 1083 1050 1005 T1 1114 1072 1031 982 924 T2 1114 1072 1031 982 924 T3 1225 1191 1152 1112 1071 T4 1287 1255 1219 1183 1146 T5 1360 1329 1299 1264 1230 CFM delivered against External Static Pressure AWST36LU14 AA Model Speed AWST18SU14 AA AWST24SU14 AA AWST30LU14 AA BLOWER CH...

Page 8: ...S UNIT MULTIPLE POWER SOURCES MAY BE PRESENT FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE PERSONAL INJURY OR DEATH Wiring is subject to change Always refer to the wiring diagram on the unit for the most up to date wiring WIRING DIAGRAM AWUF19 16 5 WIRING DIAGRAM AWST18SU14 ...

Page 9: ...UE BR BROWN GR GREEN PU PURPLE RD RED WH WHITE YL YELLOW PK PINK 5 WIRING CODE FACTORY WIRING HIGH VOLTAGE LOW VOLTAGE FIELD WIRING HIGH VOLTAGE 6 COMPONENT CODE C CONTACTOR DISC DISCONNECT SWITCH EM EVAPORATER MOTOR F FUSE HTR HEATER ELEMENT R RELAY SEQ SEQUENCER TL THERMAL LIMIT TR TRANSFORMER 7 FOR UNITS USING 3KW AND 5KW HEAT ERS WHITE WIRE W ILL BE CONNECTED TO TERMINAL 4 BTUh PURPL E 18000 P...

Page 10: ...L 2 FOR 208 VOLTS 2 CONFIRM SPEED TAP SELECT ED IS APPROPRIATE FOR APPLICATION I F SPEED TAPS NEEDS TO BE CHA NGED CONNECT APPROPRIATE WIRE FROM MOTOR TO Y FROM THERMOSTAT CONDENSER SEE TABLE 1 3 ASTERISK INDICATES THAT HEATING ELEMENT THERMAL LIMIT RELAY AND INTERCONNECTING WIRES AND JUMPERS OF HEATER 2 A RE DELETED WITH SINGLE ELEMENT UNITS 4 COLOR CODES BK BLACK BL BLUE BR BROWN GR GREEN PU PUR...

Page 11: ...ust again as required If adjusting the valve has no effect on the SH the valve may be stuck because of dirt or debris or it may have lost the Power Element charge i i After properly reclaiming the refrigerant remove the TXV and check for dirt and debris Clean if possible or replace the TXV and filter drier If the system appears to be flooding compressor frosting or moisture is condensing at the su...

Page 12: ...the unit without first discussing your plans with your dealer or other qualified servicer Restricted airflow could lead to poor operation and or severe equipment damage Likewise it is important to keep the outdoor coil clean Dirt leaves or debris could also restrict the airflow If cleaning of the outdoor coil becomes necessary hire a qualified servicer Inexperienced people could easily puncture th...

Page 13: ...15 START UP CHECKLIST 13 ...

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Page 15: ...15 THIS PAGE INTENTIONALLY LEFT BLANK ...

Page 16: ...s and Training Financing Options is a registered trademark of Maytag Corporation or its related companies and is used under license All rights reserved 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 warranty protection except that failure...

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