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INSTALLATION AND MAINTENANCE
Split System Air Conditioner
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
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
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
Sharp metal edges can cause injury. When
installing the unit, use care to avoid sharp
edges.
Save these instructions for future reference
# 504,910M
INSTRUCTIONS
SCU12M Series
WARNING
TABLE OF CONTENTS
UNIT DIMENSIONS ............................... 2
INSTALLATION ...................................... 3
START-UP ............................................ 10
OPERATION ........................................ 13
MAINTENANCE ................................... 13
CONNECTION DIAGRAM ................... 15
WARRANTY ......................................... 16
Manufactured By
A.A.C.
A Lennox International Company
421 Monroe Street
Bellevue, OH 44811
Page 1
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Summary of Contents for Lennox CU12M Series
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Page 1: Table Of Contents
Manufactured By A.A.C. WARNING A Lennox International Company 421 Monroe Street Sharp metal edges can cause injury. When Bellevue, OH 44811 installing the unit, use care to avoid sharp edges. -
Page 2: Unit Dimensions
UNIT DIMENSIONS Page 2 # 504,910M... -
Page 3: Installation
INSTALLATION Installation Clearances General Read this entire instruction manual, as well as the instructions supplied in separate equipment, before starting the installation. Observe and follow all warn- ings, cautions, instructional labels, and tags. Failure to comply with these instructions could result in an unsafe condition and/or premature component failure. - Page 4 using a proper conduit fitting. Units are approved for use only with copper conductors. 24V Class II circuit WARNING connections are made in the low voltage junction box. Before opening any system, make sure the Refer to Figure 7 on page 15 for field wiring diagram pressure in the system is brought to and (wiring diagram also found inside unit control box remains at atmospheric pressure.
- Page 5 Flushing Connections Note: The inverted R22 cylinder must contain at least the same amount of refrigerant as was recovered from the existing system. Figure 3 2. Remove the existing outdoor unit. Set the new R410A If the existing outdoor unit is not equipped with shutoff valves, or if the unit is not operational AND you plan to unit and follow the brazing connection procedure (see page 6) to make line set connections.
- Page 6 6. Invert the cylinder of clean R22 and open its valve to allow liquid refrigerant to flow into the system through Refrigerant Line Set Diameters the suction line valve. Allow the refrigerant to pass from the cylinder and through the line set and the indoor coil before it enters the recovery machine.
- Page 7 Fixed Orifice Systems Metering Device Installation SCU12M units are shipped with a fixed orifice refrigerant metering device. Replace the existing indoor unit fixed orifice with the orifice supplied with this unit. Place the supplied fixed orifice sticker on the indoor cabinet after installation.
- Page 8 3. Connect gauge to the service port. Service Valve 4. When testing is completed, replace service port cap. Tighten finger tight, then an additional 1/6 turn. To Open Liquid or Suction Line Service Valve: 1. Remove stem cap with an adjustable wrench. 2.
- Page 9 The ball valve is equipped with a service port with a 4. Connect a cylinder of nitrogen with a pressure regulat- factory-installed Schrader valve. A service port cap ing valve to the center port of the manifold gauge set. protects the Schrader valve from contamination and When using high pressure gas such as nitrogen serves as the primary seal.
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Page 10: Start-Up
4. Open both manifold valves and start vacuum pump. START-UP 5. Evacuate the line set and indoor unit to an absolute 1. Rotate fan to check for frozen bearings or binding. pressure of 23mm (23,000 microns) of mercury 2. Inspect all factory and field-installed wiring for loose (approximately 1 in. - Page 11 The following procedure is intended as a general guide and is for use on expansion valve systems only. For best Refrigerant Charge Adjustment results, indoor temperature should be 70° – 80°F. Be sure to monitor system pressures while charging. . t f 1.
- Page 12 the ambient and liquid temperatures should match values given in Table 6. Refrigerant must be added to R410A Temperature/Pressure Chart lower approach temperature and removed to increase approach temperature. Loss of charge results in low capacity and efficiency. F ° F °...
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Page 13: Operation
OPERATION MAINTENANCE Outdoor unit and indoor blower cycle on demand from the WARNING room thermostat. When the thermostat blower switch is moved to the ON position, the indoor blower operates Before performing maintenance operations on continuously. system, turn the electric power to unit OFF at disconnect switch(es). - Page 14 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 14 # 504,910M...
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Page 15: Connection Diagram
Connection Diagram Part # 534, 638W Figure 7 # 504,910M Page 15... -
Page 16: Warranty
Limited Warranty August 1, 1997 This warranty gives you specific legal rights and you may have other rights which vary from state/province to state/province. Warrantor: Armstrong Air Conditioning Inc., 421 Monroe St., Bellevue, OH 44811 Armstrong Air Conditioning Inc. products are available under the following names: Air Ease, Armstrong Air, American Aire, Concord Subject to the limitations stated in this warranty, we warrant to the first buyer for use the residential heating, cooling or heat pump unit, when installed, operated and maintained as required by this warranty, to be free of defects in workmanship or material for a period of 5 years (1 year for commercial equipment) from the time of installation.