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INSTALLATION AND MAINTENANCE
INSTRUCTIONS
SCU Series
Split System Air Conditioner
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 per-
sonal injury, death or property damage. Use appropriate safety gear including safety
glasses and gloves when installing this equipment.
WARNING
Ris
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The unit has been designed to operate within the range of INSTALLATION indoor and outdoor temperatures as outlined in Table 1. Following these recommendations will minimize compo- General nent failures and maximize system performance. Read this entire instruction manual, as well as the instructions supplied in separate equipment, before starting the installation. Observe and follow all Optimum Temperature Range warnings, cautions, instructional labels and tags. Failure to comply with these inst
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Minimum Clearances TO POWER THERMOSTAT SUPPLY WEATHERPROOF TO 48" OVERHEAD DISCONNECT INDOOR CLEARANCE SWITCH UNIT NEC CLASS 1 WIRING 12" CLEARANCE TO NEC CLASS 2 EVAPORATOR WIRING COIL NAMEPLATE 24" SERVICE LOCATION ACCESS CLEARANCE SEAL OPENING(S) 12" CLEARANCE WITH PERMAGUM BOTH SIDES OR EQUIVALENT NOTE: ALL OUTDOOR WIRING MUST BE WEATHERPROOF Figure 1 Refrigerant Piping Connections 3. Route tubing to fittings on the outdoor unit vapor and liquid s
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Factory charge contains refrigerant for condenser, evapo- toward the compressor. For long vertical risers, additional rator and 20 feet of 3/8” line set. For line set other than 20 traps are recommended for each additional 20 feet of pipe feet, adjust charge at 0.60 oz. per foot of 3/8” o.d. liquid to insure proper oil movement. line and 1.2 oz. per foot of 1/2”. To obtain optimum performance, system charge should be weighed in A crankcase heater is recommended for applications accordance to
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START-UP MAINTENANCE The procedure for start-up of the unit is as follows: WARNING 1. Operate the unit for a period of at least 15 minutes to Before performing maintenance operations on allow for pressures and temperatures to stabilize. system, turn off all main power switches to Unless matched with an indoor section using an indoor and outdoor units. Turn off accessory expansion valve, the superheat method can be used heater power switch if applicable. Electrical to check the system refrige
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BLK BLK YEL BLA BLAC CK K BRN RED CONNECTION DIAGRAM EQUIPMENT GROUND FAN L LI IN NE E V VO OL LT TA AG GE - E - F FA ACT CTOR ORY Y CAPACITOR LINE VOLTAGE - FACTORY (IF USED) FAN LINE VOLTAGE - FIELD MOTOR LOW VOLTAGE - FACTORY LOW VOLTAGE - FACTORY (IF USED) LOW VOLTAGE - FIELD BROWN VIOLET RED COMP T2 T3 T1 CONTACTOR T1 NOTE: L1 BLA BLAC CK K REPLACEMENT WIRE MUST BE THE SAME GAGE AND T2 L2 INSULATION THICKNESS, 105° APPLIANCE WIRING T3 L3 MATERIAL. YEL YEL DISCHARGE HIGH PRESS REFER TO RATIN
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BLK BLK YEL BLUE YEL START YEL ASSIST CONNECTION START CAP. DEVICE (IF USED) (IF USED) DIAGRAM START RELAY (IF USED) COM 2 5 FAN HERM LINE VOLTAGE - FACTORY LINE VOLTAGE - FACTORY (IF USED) 1 LINE VOLTAGE - FIELD LOW VOLTAGE - FACTORY FAN COMP LOW VOLTAGE - FACTORY (IF USED) RED RUN LOW VOLTAGE - FIELD CAP RED BROWN NOTE: BLK BLK IF ANY OF THE ORIGINAL VIOLET WIRE IS REPLACED, THE SAME SIZE AND TYPE WIRE RED MUST BE USED. CONTACTOR COMP T1 L1 C R R S T1 L1 T2 L2 YEL GROUND BLK SCREW T2 L2 RED YE
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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
