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This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to
the potential for personal injury or death.
WARNING
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.
ELECTRICAL SHOCK HAZARD!
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.
Sharp metal edges can cause injury. When installing
the unit, use care to avoid sharp edges.
Manufactured By
Allied Air Enterprises LLC
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
507523-01
INSTALLATION INSTRUCTIONS
4SCU20LX UNITS
(R410A REFRIGERANT)
This manual must be left with the homeowner for future reference.
WARNING
WARNING
Save these instructions for future reference
Table of Contents
Installation ...................................................................2
Refrigeration Piping .....................................................4
Electrical Connections ...............................................12
Start-Up Procedure....................................................15
Maintenance ..............................................................16
Homeowner Information ............................................17
Read this entire instruction manual, as well as the
instructions supplied in separate equipment, before
starting the installation. Observe and follow all warnings,
cautions, instructional labels, and tags. Failure to comply
with these instructions could result in an unsafe condition
and/or premature component failure.
These instructions are intended as a general guide only
for use by qualified personnel and do not supersede any
national or local codes in any way. The installation must
comply with all provincial, state, and local codes as well as
the National Electrical Code (U.S.) or Canadian Electrical
Code (Canada). Compliance should be determined prior
to installation.
This unit uses R-410A, which is an ozone-friendly HFC
refrigerant. The unit must be installed with a matching
indoor coil and line set.
*P507523-01*
Issue 1946
(P) 507523-01
Page 1 of 19
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Summary of Contents for Allied 4SCU20LX
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Page 1: Table Of Contents
Sharp metal edges can cause injury. When installing indoor coil and line set. the unit, use care to avoid sharp edges. Manufactured By *P507523-01* Allied Air Enterprises LLC A Lennox International, Inc. Company 215 Metropolitan Drive (P) 507523-01 West Columbia, SC 29170... -
Page 2: Installation
When servicing or repairing HVAC components, ensure Installation the fasteners are appropriately tightened. Table 1 shows torque values for fasteners. NOTE: In some cases, noise in the living area has been Fastener Torque traced to gas pulsations from improper installation of equipment. - Page 3 24” 6”* Figure 1. 30” around Control Elevate Unit NOTE: See Table 2 for specific minimum clearance guidelines. CAUTION Figure 2. Accumulation of water and ice in base pan may cause DO LOCATE THE UNIT: equipment damage. • With proper clearances on sides and top of unit •...
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Page 4: Refrigeration Piping
Filter Drier Refrigeration Piping The filter drier is very important for proper system operation and reliability. If the drier is shipped loose, it must be installed by the installer in the field. Unit warranty will be • Use only refrigerant grade copper tubes. void, if the drier is not installed. - Page 5 STUB END TWO-PIECE PATCH PLATE NOTE LIQUID LINE CHECK (UNCASED COIL ONLY) ORIFICE EXPANSION HOUSING VALVE DISTRIBUTOR In lieu of R-410A, an industry-standard flushing agent TUBES ® TEFLON may also be used. RING ® CYLINDER CONTAINING TEFLON GAUGE SENSING CLEAN R-410A TO BE RING MANIFOLD LINE...
- Page 6 Refrigerant Piping - Install Indoor Expansion Valve This outdoor unit is designed for use in systems that include an expansion valve metering device (purchased separately) at the indoor coil. See the Product Specifications for approved expansion valve kit match-ups and application information. The check expansion valve unit can be installed internal or external to the indoor coil.
- Page 7 Refrigerant Piping - Brazing Procedures CAP AND CORE REMOVAL CUT AND DEBUR Cut ends of the refrigerant lines square (free from nicks or dents) Remove service cap and core from and debur the ends. The pipe must remain round. Do not crimp end both the vapor and liquid line service of the line.
- Page 8 WRAP SERVICE VALVES To help protect service valve seals during brazing, wrap water-saturated cloths around service valve bodies and copper tube stubs. Use additional water-saturated cloths underneath the valve body to protect the base paint. FLOW NITROGEN Flow regulated nitrogen (at 1 to 2 psig) through the refrigeration gauge set into the valve stem port connection on the liquid service valve and out of the vapor valve stem port.
- Page 9 Leak Test and Evacuation LEAK TEST HIGH MANIFOLD GAUGE SET OUTDOOR UNIT TO VAPOR SERVICE VALVE NOTE - Position canister to deliver liquid refrigerant. NITROGEN HFC-410A CONNECT GAUGE SET A - Connect the high pressure hose of an HFC-410A manifold gauge set to the vapor valve service port. NOTE - Normally, the high pressure hose is connected to the liquid line port.
- Page 10 EVACUATION HIGH CONNECT GAUGE SET NOTE - Remove cores from service valves (if not already done). A - Connect low side of manifold gauge set with 1/4 SAE in-line tee to vapor line service valve B - Connect high side of manifold gauge set to OUTDOOR MANIFOLD liquid line service valve...
- Page 11 Liquid and Suction Line Service Valves The liquid line and suction line service valves (see Figure 5) and service ports are used for leak testing, evacuation, charging, and checking charge. Each valve is equipped with a service port which has a factory-installed Schrader valve.
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Page 12: Electrical Connections
Ensure the room thermostat is properly installed per Electrical Connections instructions shipped with room thermostat. Generally the thermostat should not be exposed to sunlight, drafts or vibration and should not be mounted on exterior walls. WARNING WARNING Electrical Shock Hazard! Low voltage wiring must be separated from high voltage Turn OFF electric power before connecting wiring. - Page 13 OUTDOOR UNIT CONNECT CONDUIT TO CUTOUT AND ROUTE HIGH VOLTAGE WIRING CONNECTS TO RAST 6-PIN CONNECTOR GROMMET AND PROVIDED RAST CABLE TIE. 6-PIN CONNECTOR ROUTE CONTROL INDOOR CONTROL WIRING THROUGH USE WATERTIGHT GROMMET AND CONDUIT FOR HIGH SECURE WITH VOLTAGE CABLE TIE Indoor Control Thermostat...
- Page 14 7-SEGMENT DISPLAY PUSH BUTTON Figure 8. Control Board Page 14 of 19 Issue 1946 507523-01...
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Page 15: Start-Up Procedure
Start-Up Procedure IMPORTANT Mineral oils are not compatible with R-410A. If oil must be added, it must be a polyolester oil. CAUTION If unit is equipped with a crankcase heater, it should NOTE: Both airflow and refrigerant charge must be be energized 24 hours before unit start-up to prevent monitored for proper system set-up. -
Page 16: Maintenance
Maintenance Regular Maintenance Requirements Condenser Coils Your system should be regularly inspected by a qualified Grass cuttings, leaves, dirt, dust, lint from clothes dryers, service technician. These regular visits may include and foliage from trees can be drawn into coils by movement (among other things) checks for: of the air. -
Page 17: Homeowner Information
Homeowner Information Important System Information • Your system should never be operated without a clean WARNING air filter properly installed. ELECTRICAL SHOCK HAZARD! • Return air and supply air registers should be free from restrictions or obstructions to allow full flow of air. Turn OFF electric power to unit before performing any maintenance or removing panels or doors. - Page 18 BLACK BLUE WHITE WHITE BLUE BLACK BROWN YELLOW BLACK GRAY GRAY/RED INDOOR UNIT i COMFORT THERMOSTAT Figure 9. A/C Single Phase Wiring Diagram - 24 & 36 Models Page 18 of 19 Issue 1946 507523-01...
- Page 19 Figure 10. A/C Single Phase Wiring Diagram - 48 & 60 Models 507523-01 Issue 1946 Page 19 of 19...
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