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INSTALLATION AND MAINTENANCE INSTRUCTIONS
with Dry Nitrogen Holding Charge
These instructions must be read and understood completely before attempting installation.
This unit is factory-charged with DRY NITROGEN. The unit is intended for installation
in existing HCFC-22 systems. Carefully follow all installation procedures.
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.
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.
Installation and servicing of air conditioning equipment
can be hazardous due to internal refrigerant pressure
and live electrical components. Only trained and
qualified service personnel should install or service
this equipment. Installation and service performed by
unqualified persons can result in property damage,
personal injury, or death.
Sharp metal edges can cause injury. When installing
the unit, use care to avoid sharp edges.
506874-01
2SCU13 Series
Split System Air Conditioner
NOTICE TO INSTALLER
WARNING
WARNING
WARNING
WARNING
INSTALLATION ....................................................2
START-UP .......................................................... 10
OPERATION ...................................................... 14
MAINTENANCE ................................................. 14
CONNECTION DIAGRAMS ............................... 16
WARRANTY ....................................................... 18
Issue 1140
TABLE OF CONTENTS
*P506874-01*
(P) 506874-01
Page 1 of 19
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Summary of Contents for Lennox 2SCU13-18
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Page 1: Table Of Contents
INSTALLATION AND MAINTENANCE INSTRUCTIONS 2SCU13 Series with Dry Nitrogen Holding Charge Split System Air Conditioner These instructions must be read and understood completely before attempting installation. NOTICE TO INSTALLER This unit is factory-charged with DRY NITROGEN. The unit is intended for installation in existing HCFC-22 systems. -
Page 2: Installation
INSTALLATION Upon receipt of equipment, carefully inspect it for possible shipping damage. If damage is found, it should be noted on General the carrier’s freight bill. Take special care to examine the The 2SCU13 air conditioner, which will also be referred to unit inside the carton if the carton is damaged. - Page 3 Slab Mounting Thermostat Designations Discharge Air Thermostat Indoor Unit Building Power Outdoor Structure Unit Heat Cooling Y1 Outdoor Unit Indoor Blower Mounting Slab C Outdoor Unit See unit wiring diagram for power supply connections. Ground Level If the indoor unit is not equipped with a blower relay, one must be field supplied and installed.
- Page 4 Outside Unit Placement Refrigerant Line Set Diameters (in.) and Installation L iquid L ine Install unit away L ine S et L ength a nd S iz e from windows B T U H 12 ft. 25 ft. 50 ft. 75 ft. 100 ft. 18,000 24,000 30,000...
- Page 5 Refrigerant Line Sets: Installing Horizontal Runs To hang line set from joist or rafter, use either metal strapping material Wire Tie or anchored heavy nylon wire ties. (around vapor line only) 8’ Strapping Material Floor Joist or (around vapor line only) Roof Rafter Tape or Wire Tie 8’...
- Page 6 Refrigerant Line Sets: Installing Vertical Runs (new construction shown) IMPORTANT: Refrigerant lines must not contact wall. Outside Wall NOTE: Similar installation practices Vapor Line Liquid Line should be used if line set is to be installed Wood Block on exterior of outside wall. Between Studs Wire Tie Inside Wall...
- Page 7 Part 2. Connect gauge to the service port. Model Number 3. When testing is completed, replace service port cap. 2SCU13-18, -24, -30, -36 A2TXV01 Tighten finger tight, then an additional 1/6 turn. 2SCU13-42, -48 A2TXV02 To Open Liquid or Suction Line Service Valve:...
- Page 8 Service Valve Ball Type Service Valve (Valve Open) Valve Closed Use adjustable wrench. To open, rotate stem counterclock- wise 1/4 turn (90°). To close, rotate stem clockwise 1/4 turn (90°). Figure 10 WARNING Valve Open Fire, Explosion, and Personal Safety Hazard. Figure 9 Failure to follow this warning could result in damage, personal injury, or death.
- Page 9 3. Open the high pressure side of the manifold to allow 6. Evacuate the system to a minimum of 500 microns or HCFC-22 into the line set and indoor unit. Weigh in a lower. During the early stages of evacuation, it is trace amount of HCFC-22.
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Page 10: Start-Up
START-UP Optimizing System Charge The outdoor unit should be charged during warm weather. However, applications arise in which charging must occur in CAUTION the colder months. The method of charging is determined by the unit’s refrigerant metering device and the outdoor If unit is equipped with a crankcase heater, it should be ambient temperature. - Page 11 Charge Using Subcooling Method (TXV Systems) – Subcooling Values for Outdoor Temperatures 65°F or Above TXV Systems If charging a TXV system when the outdoor ambient temperature is 65°F or above, the subcooling method can be used to charge the unit. 1.
- Page 12 Approach Values for TXV Systems Approach value is the liquid line temperature minus the outdoor ambient temperature (±1°F). NOTE: For best results, use the same digital thermometer to check both outdoor ambient and liquid temperatures. Table 8 Table 7 6. Compare the approach value with those shown in Table 8.
- Page 13 Normal Operating Pressures L – Liquid S – Suction Values provided above are typical pressures. Indoor unit matchup, indoor air quality, and indoor load will cause pressures to vary. Table 9 506874-01 Issue 1140 Page 13 of 19...
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Page 14: 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 system, continuously. turn the electric power to unit OFF at disconnect switch(es). - Page 15 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 Start-Up and Performance Checklist Job Name _______________________________ Job No. ________________ Date ______________ Job Location _____________________________ City ___________________ State ______________ Installer _________________________________...
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Page 16: Connection Diagrams
Single Phase Wiring Diagram P/N 48352-001 OUTDOOR DUAL CAPACITOR TIMED OFF CONTROL PURPLE TO 24 VAC (IF USED) BLACK POWER SOURCE 20 VA MINIMUM ORANGE NEC CLASS 2 YELLOW BLACK COMPRESSOR COMPRESSOR CONTACTOR CRANKCASE HEATER (IF USED) GROUND 208-230/60/1 GROUND BLACK K1-1 S4 HIGH... - Page 17 Three Phase Wiring Diagram OUTDOOR OUTDOOR FAN CAPACITOR TIMED OFF CONTROL PURPLE TO 24 VAC (IF USED) BLACK POWER SOURCE ORANGE 10 VA MINIMUM NEC CLASS 2 BLACK BLACK COMPRESSOR BLACK T3 T2 T1 COMPRESSOR CONTACTOR CRANKCASE HEATER L3 L2 L1 (IF USED) GROUND 208-230/60/3...
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Page 18: Warranty
Should such exclusion or limitation of the listed below: warranty be unenforceable, such implied warranties are in any event Lennox Industries Inc. Allied Air Enterprises limited to to a period of one (1) year. Liability for incidental and conse- P.O.