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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.
WARNING
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.
WARNING
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
506467-01
INSTALLATION INSTRUCTIONS
4AC16LT SERIES
Two-Stage Split System Air Conditioner
This manual must be left with the homeowner for future reference.
Save these instructions for future reference
Table of Contents
General ........................................................................1
Installation ...................................................................2
Refrigeration Piping .....................................................4
Electrical Wiring .........................................................12
Start-Up .....................................................................13
Operation ...................................................................14
Maintenance ..............................................................17
Homeowner Information ............................................18
General
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. A filter drier approved for use with
R-410A is installed in the unit.
*P506467-01*
Issue 1946
(P) 506467-01
Page 1 of 19
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Summary of Contents for Ducane 4AC16LT Series
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS 4AC16LT SERIES Two-Stage Split System Air Conditioner This manual must be left with the homeowner for future reference. 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. -
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 traced to gas pulsations from improper installation of Fastener Torque equipment. - Page 3 Discharge Air Building Structure 24” Mounting Slab 6”* Ground Level Mounting slab must slope slightly away from building, not to exceed 1/4” per foot. 30” around Control Figure 1. Slab Mounting NOTE: See Table 2 for specific minimum clearance guidelines. Elevate Unit Figure 2.
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Page 4: Refrigeration Piping
It is recommended that vertical suction risers not be up- Refrigeration Piping sized. Proper oil return to the compressor should be maintained with suction gas velocity. • Use only refrigerant grade copper tubes. Filter Drier • Split systems may be installed with up to 50 feet of The filter drier is very important for proper system operation line set (no more than 20 feet vertical) without special and reliability. - Page 5 Use a field-provided fitting to temporarily reconnect the liquid line to the indoor unit’s liquid line orifice housing. NOTE In lieu of R-410A, an industry-standard flushing agent STUB END TWO-PIECE PATCH PLATE LIQUID LINE CHECK may also be used. (UNCASED COIL ONLY) ORIFICE EXPANSION HOUSING...
- 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 Wiring
Ground unit at unit disconnect switch or to an earth Electrical Wiring ground. To facilitate conduit, a hole is in the bottom of the control box. Connect conduit to the control box All field wiring must be done in accordance with the National using a proper conduit fitting. -
Page 13: Start-Up
Start-Up 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 14: Operation
Interpreting the Diagnostic LEDs Operation When an abnormal system condition occurs, the diagnostic module displays the appropriate ALERT and/or TRIP LED. The yellow ALERT LED will flash a number of System Diagnostic Module times consecutively, pause, and then repeat the process. 4AC16LT units contain... - Page 15 LED Status Fault Description Troubleshooting Information POWER Module has power Supply voltage is present at module terminals (Green) TRIP Thermostat demand signal 1. Compressor protector is open (Red) Y1 is present, but the • Check for high head pressure compressor is not running •...
- Page 16 LED Status Fault Description Troubleshooting Information ALERT Open Run Circuit 1. Open circuit in compressor run wiring or connections (Yellow) Current only in start circuit • Check wiring and connectors between supply and the compressor R terminal Flash Code 7 2.
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Page 17: 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 18: 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 19 Figure 8. Wiring Diagram 506467-01 Issue 1946 Page 19 of 19...
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