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# 504,910M

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INSTALLATION AND MAINTENANCE

INSTRUCTIONS

SCU12M Series

Split System Air Conditioner

TABLE OF CONTENTS

UNIT DIMENSIONS ............................... 2

INSTALLATION ...................................... 3

START-UP ............................................ 10

OPERATION ........................................ 13

MAINTENANCE ................................... 13

CONNECTION DIAGRAM ................... 15

WARRANTY ......................................... 16

Sharp metal edges can cause injury. When
installing the unit, use care to avoid sharp
edges.

  WARNING

Installation and servicing of air conditioning
equipment can be hazardous due to internal
refrigerant pressure and live electrical com-
ponents. Only trained and qualified service
personnel should install or service this equip-
ment. Installation and service performed by
unqualified persons can result in property
damage, personal injury, or death.

  WARNING

Risk of electrical shock. Disconnect all
remote power supplies before installing or
servicing any portion of the system. Failure
to disconnect power supplies can result in
property damage, personal injury, or death.

  WARNING

The equipment covered in this manual is to be installed by trained and experienced
service and installation technicians. Improper installation, modification, service, or
use can cause electrical shock, fire, explosion, or other conditions which may cause
personal injury, death, or property damage. Use appropriate safety gear including
safety glasses and gloves when installing this equipment.

 

WARNING

Manufactured By

A.A.C.

A Lennox International Company

421 Monroe Street

Bellevue, OH 44811

Summary of Contents for SCU12M-024

Page 1: ...on and service performed by unqualified persons can result in property damage personal injury or death WARNING Risk of electrical shock Disconnect all remote power supplies before installing or servic...

Page 2: ...A B C 4 2 0 M 2 1 U C S n i 5 2 4 1 4 2 4 1 4 2 m m 5 3 6 6 1 6 6 1 6 0 3 0 M 2 1 U C S 6 3 0 M 2 1 U C S 2 4 0 M 2 1 U C S 8 4 0 M 2 1 U C S n i 3 3 4 1 2 3 4 1 4 2 m m 8 3 8 9 1 8 6 1 6 0 6 0 M 2 1...

Page 3: ...12M condensing units use R410A which is an ozone friendly HFC refrigerant This unit must be installed with a matching indoor coil and line set SCU12M units are designed for use in expansion valve TXV...

Page 4: ...SCU12M unit Field refrigerant piping consists of liquid and suction lines from the outdoor unit sweat connections to the indoor coil flare or sweat connections Flushing Existing Line Set and Indoor C...

Page 5: ...to flow back into the low side of the sys tem Disconnect the liquid and vapor lines from the existing outdoor unit 2 Remove the existing outdoor unit Set the new R410A unit and follow the brazing conn...

Page 6: ...that all of the R22 vapor is recovered Allow the recovery to pull a vacuum on the system NOTE A single system flush should remove all of the mineral oil from the existing refrigerant lines and indoor...

Page 7: ...using 4 Connect the external equalizer line to the equalizer port on the suction line splice 5 Strap the superheat sensing bulb to the suction header If installing an expansion valve on an indoor coil...

Page 8: ...r Suction Line Service Valve 1 Remove the stem cap with an adjustable wrench 2 Use a service wrench with a hex head extension to turn the stem clockwise to seat the valve Tighten it firmly 3 Replace t...

Page 9: ...s Check all joints for leaks Purge nitrogen and R410A mixture Correct any leaks and recheck IMPORTANT The leak detector must be capable of sensing HFC refrigerant Evacuation Evacuating the system of n...

Page 10: ...pen both manifold valves and start vacuum pump 5 Evacuate the line set and indoor unit to an absolute pressure of 23mm 23 000 microns of mercury approximately 1 in of mercury During the early stages o...

Page 11: ...he same digital thermometer used to check outdoor ambient temperature to check liquid line temperature Verify the unit charge using the approach method The difference between Refrigerant Charge Adjust...

Page 12: ...2 p m e T F e r u s s e r P g i s P 4 7 0 4 1 2 5 7 4 7 1 2 6 7 9 0 2 2 7 7 4 4 2 2 8 7 0 8 2 2 9 7 6 1 3 2 0 8 3 5 3 2 1 8 0 9 3 2 2 8 7 2 4 2 3 8 5 6 4 2 4 8 3 0 5 2 5 8 1 4 5 2 6 8 0 8 5 2 7 8 0 2...

Page 13: ...d installer or service agency At the beginning of each cooling season the system should be checked as follows 1 Clean and inspect condenser coil Coil may be flushed with a water hose Be sure the power...

Page 14: ...Page 14 504 910M 4 Check all wiring for loose connections 5 Check for correct voltage at unit with unit operating 6 Check amp draw on blower motor Unit nameplate _________ Actual _________...

Page 15: ...504 910M Page 15 Figure 7 Connection Diagram Part 534 638W...

Page 16: ...ligation in connection with the warranted product What is NOT Covered 1 Cabinets or cabinet pieces 2 Normal maintenance items such as filters fan belts fuses or other consumable items 3 Damage caused...

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