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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
# 504,465M
INSTRUCTIONS
SCU14M Series
WARNING
TABLE OF CONTENTS
UNIT DIMENSIONS ............................... 2
INSTALLATION ...................................... 3
START-UP ............................................ 10
OPERATION ........................................ 12
MAINTENANCE ................................... 12
CONNECTION DIAGRAM ................... 14
WARRANTY ......................................... 15
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 SCU14M 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
INLET UNIT DIMENSIONS INLET COMPRESSOR INLET TOP VIEW ELECTRICAL INLETS SUCTION LINE DISCHARGE INLET 4-1/2 (114) LIQUID LINE INLET 2-9/16 (65) 1-3/4 (44) (102) (102) (51) (51) ACCESS VIEW 1-3/8 6-1/16 (35) (154) SIDE VIEW Page 2 # 504,465M... -
Page 3: Installation
INSTALLATION Location of Unit Refer to UNIT DIMENSIONS on page 2 for sizing mount- General ing slab, platforms, or supports. Refer to Figure 1 below Read this entire instruction manual, as well as the for installation clearances. instructions supplied in separate equipment, before Slab Mounting starting the installation. - Page 4 Electrical Wiring SCU14M and Furnace (Gas or Electric) All field wiring must be done in accordance with the Thermostat Connections National Electrical Code (NEC) recommendations, (Some connections may not apply. Canadian Electrical Code (CEC) and CSA Standards, or Refer to specific thermostat and furnace.) local codes, where applicable.
- Page 5 Brazing Connection Procedure Plumbing If the SCU14M unit is being installed with a new indoor 1. The end of the refrigerant line must be cut square and coil and line set, the plumbing connections should be its internal shape must remain round. The line must made as outlined in the section that follows.
- Page 6 2. Separate the distributor assembly and remove the Flushing Existing Line Set and Indoor Coil piston orifice and used teflon seal. Insert nozzle end of the thermo expansion valve along with a new teflon seal CAUTION into the distributor and tighten to 20 – 30 ft. lbs. Use backup wrench on all wrench flats.
- Page 7 and two sets of gauges (one for use with R22 and one for prevent proper flushing. Use a field-provided fitting to use with R410A). reconnect the lines. Flushing Procedure 4. Remove the pressure tap valve cores from the SCU14M unit’s service valves. Connect an R22 IMPORTANT: The line set and/or indoor coil must be cylinder with clean refrigerant to the suction service flushed with at least the same amount of refrigerant that...
- Page 8 To Open Liquid or Suction Line Service Valve: Liquid and Suction Line Service Valves The liquid line and suction line service valves (Figures 5 1. Remove stem cap with an adjustable wrench. and 6) and gauge ports are accessible from inside the unit, behind the access panel.
- Page 9 4. Connect a cylinder of nitrogen with a pressure regulat- WARNING ing valve to the center port of the manifold gauge set. When using high pressure gas such as nitrogen Do not attempt to backseat this valve. At- for this purpose, be sure to use a regulator that tempts to backseat this valve will cause snap can control the pressure down to 1 or 2 psig.
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Page 10: Start-Up
the absolute zero of pressure. Absolute pressure in a liquid valve, remove cap and turn valve stem until it is vacuum is equal to atmospheric pressure minus fully open. vacuum pressure. NOTE: When replacing valve caps, the caps should 5. When the absolute pressure reaches 23mm of be finger tight then tightened an additional 1/6 of a mercury, close the manifold gauge valves, turn off the turn. - Page 11 The compressor is charged with sufficient polyol 4. Outdoor temperature should be 60°F or above. For ester oil for line set lengths up to 50'. If line set best results, use the same digital thermometer lengths longer than 50' will be required, add 1 oz. of used to check outdoor ambient temperature to oil for every additional 10' of line set.
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Page 12: Operation
using the approach method. The difference between power from the compressor when suction line pressure the ambient and liquid temperatures should match drops below factory setting at 40 ± 5 psi. values given in Table 6. Refrigerant must be added to lower approach temperature and removed to increase Filter Drier approach temperature. - Page 13 Indoor Unit 1. Clean or change filters. 2. Adjust blower speed for cooling. The pressure drop over the coil should be measured to determine the correct blower CFM. Refer to the unit information service manual for pressure drop tables and proce- dure.
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Page 14: Connection Diagram
GROUND OUTDOOR FAN GROUND (LEADLESS) COMMON COMPRESSOR CAPACITOR CONTACTOR HIGH OUTDOOR FAN (LEADED) ORANGE-COMMON 208-230/60/1 DUAL BLACK-RUN CAPACITOR PURPLE- ROOM THERMOSTAT CAPACITOR NOTE- FOR USE WITH COPPER CONDUCTORS ONLY. REFER TO UNIT RATING PRESSURE HEAT PLATE FOR MINIMUM CIRCUIT SWITCH HIGH AMPACITY AND MAXIMUM OVER- PRESSURE... -
Page 15: 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.