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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 per-
sonal 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 discon-
nect 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 compo-
nents. 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
Before performing maintenance operations on
system, turn off all main power switches to
indoor and outdoor units. Turn off accessory
heater power switch if applicable. Electrical
shock could cause personal injury or death.
# 41718L098
INSTRUCTIONS
SCU Series
WARNING
Save these instructions for future reference
TABLE OF CONTENTS
INSTALLATION....................................... 2
START-UP .............................................. 5
MAINTENANCE ..................................... 5
WIRING DIAGRAMS .............................. 6
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 41718L098
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Page 1: Table Of Contents
Before performing maintenance operations on system, turn off all main power switches to indoor and outdoor units. Turn off accessory heater power switch if applicable. Electrical shock could cause personal injury or death. # 41718L098 INSTRUCTIONS SCU Series WARNING INSTALLATION... 2 START-UP ... -
Page 2: Installation
Two low voltage thermostat wires must be connected to the yellow wires connected to the contactor coil. Use copper conductors only. ° 5 ° 7 ° 2 # 41718L098... - Page 3 Locate the outdoor and indoor models being installed and note any refrigerant adjustments that must be made to the system. Adjustments to the system charge must also be made if an interconnecting line set other than 20 feet is installed. # 41718L098 Minimum Clearances WEATHERPROOF DISCONNECT SWITCH Figure 1 3.
- Page 4 10 lbs. of refrigerant. 75 FT. 100 FT. BTU/HR 12 FT. Liquid Line Sizes LINE SET LENGTH AND SIZE 25 FT. 50 FT. 75 FT. 100 FT. Table 3 # 41718L098...
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Page 5: Start-Up
The control resets automatically. If the unit does not have a discharge thermostat, an add-on kit is available. # 41718L098 MAINTENANCE WARNING Before performing maintenance operations on system, turn off all main power switches to indoor and outdoor units. -
Page 6: Wiring Diagrams
BE THE SAME GAGE AND INSULATION THICKNESS, 105° APPLIANCE WIRING MATERIAL. REFER TO RATING PLATE FOR LINE VOLTAGE 3 PHASE POWER SUPPLY. USE MINIMUM 75°C COPPER WIRE ONLY. CRANKCASE HEATER (IF USED) HIGH PRESSURE SWITCH (IF USED) PART NO. 38942D005 # 41718L098... - Page 7 SCHEMATIC OF POWER CIRCUIT SCHEMATIC OF POWER CIRCUIT COMPRESSOR CONTACTOR TYPICAL SCHEMATIC OF CONTROL CIRCUIT TIME DELAY RELAY (IF USED) # 41718L098 START CAP . (IF USED) START RELAY (IF USED) HERM COMP CONTACTOR CRANK CASE CONNECT TO “C” AND “Y” TERMINALS OF INDOOR CONTROL CIRCUIT HAVING MIN.
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Page 8: Limited Warranty
Address ____________________________________________________________________________________ Telephone # ____________________________ Page 8 Limited Warranty August 1, 1997 Warranty Begins Limitations on Implied Warranties Only Warranty What is NOT Covered Warranty on Replacement Components Consequential Damages Owner Record License # _______________________________ Installation Date __________________ # 41718L098...