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SPLIT SYSTEMS

AIR CONDITIONING AND HEAT PUMP HOMEOWNER’S ROUTINE MAINTENANCE RECOMMENDATIONS

We strongly recommend a biannual maintenance checkup be performed before the heating and cooling seasons begin by a 

qualified servicer.

Replace or Clean Filter

IMPORTANT NOTE

: Never operate unit without a filter installed as dust and lint will build up on internal parts resulting in loss of efficiency, 

equipment damage and possible fire.
An indoor air filter must be used with your comfort system. A properly maintained filter will keep the indoor coil of your comfort system clean.

A dirty coil could cause poor operation and/or severe equipment damage.

Your air filter or filters could be located in your furnace, in a blower unit, or in “filter grilles” in your ceiling or walls. The installer of your air 
conditioner or heat pump can tell you where your filter(s) are, and how to clean or replace them.
Check your filter(s) at least once a month. When they are dirty, replace or clean as required. Disposable type filters should be replaced.
Reusable type filters may be cleaned.
You may want to ask your dealer about high efficiency filters. High efficiency filters are available in both electronic and non-electronic types.
These filters can do a better job of catching small airborne particles.

Compressor

The compressor motor is hermetically sealed and does not require 
additional oiling.

Motors

Indoor and outdoor fan motors are permanently lubricated and do not 
require additional oiling.

Aluminum Indoor Coil Cleaning (Qualified Servicer Only)

This unit is equipped with an aluminum tube evaporator coil. The safest way to clean the evaporator coil is to simply flush the coil with water. 

This cleaning practice remains as the recommended cleaning method for both copper tube and aluminum tube residential cooling coils.
An alternate cleaning method is to use one of the products listed in the technical publication 

TP-109 (shipped in the literature bag with the 

unit)

 to clean the coils. The cleaners listed are the only agents deemed safe and approved for use to clean round tube aluminum coils. TP-109 

is available on the web site in Partner Link > Service Toolkit.

NOTE

Ensure coils are rinsed well after use of any chemical cleaners.

Clean Outside Coil (Qualified Servicer Only)

Air must be able to flow through the outdoor unit of your comfort system. Do not construct a fence near the unit or build a deck or patio over 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 the tubing in the coil. Even a small hole in the tubing 

could eventually cause a large loss of refrigerant. Loss of refrigerant can cause poor operation and/or severe equipment damage.

Do not use a condensing unit cover to “protect” the outdoor unit during the winter, unless you first discuss it with your dealer. Any cover used 

must include “breathable” fabric to avoid moisture buildup.

BEFORE CALLING YOUR SERVICER

• Check the thermostat

 to confirm that it is properly set.

• 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 which shut off air conditioners for several 

minutes on hot days. If you wait several minutes, the unit may begin 
operation on its own.
• 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 or blower to 

confirm that it is closed.

• Check for obstructions on the outdoor unit .

 Confirm that it has not been covered on the sides or the top. Remove any obstruction that can 

be safely removed. If the unit is covered with dirt or debris, call a qualified servicer to clean it.

• Check for blockage of the indoor air inlets and outlets.

 Confirm that they are open and have not been blocked by objects (rugs, curtains or

furniture).
• 

Check the filter.

 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 the unit, call a qualified servicer.

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.

CAUTION

TO AVOID THE RISK OF EQUIPMENT DAMAGE OR FIRE, 

INSTALL THE SAME AMPERAGE BREAKER OR FUSE AS YOU 

ARE REPLACING. IF THE CIRCUIT BREAKER OR FUSE SHOULD 

OPEN AGAIN WITHIN THIRTY DAYS, CONTACT A QUALIFIED 

SERVICER TO CORRECT THE PROBLEM.

IF YOU REPEATEDLY RESET THE BREAKER OR REPLACE

THE FUSE WITHOUT HAVING THE PROBLEM CORRECTED,

YOU RUN THE RISK OF SEVERE EQUIPMENT DAMAGE.

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 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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