Table of Contents
Advertisement
Quick Links
INSTALLATION AND MAINTENANCE INSTRUCTIONS
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 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
Sharp metal edges can cause injury. When installing
the unit, use care to avoid sharp edges.
506469-01
4AC18LT SERIES
Split System Air Conditioner
Save these instructions for future reference
WARNING
Issue 1008
TABLE OF CONTENTS
INSTALLATION .................................................... 2
START-UP .......................................................... 13
OPERATION ...................................................... 17
MAINTENANCE ................................................. 21
CONNECTION DIAGRAM .................................. 23
Manufactured By
Allied Air Enterprises, Inc.
A Lennox International Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
*506469-01*
Page 1 of 24
Advertisement
Table of Contents
Related Manuals for Allied Air 4AC18LT Series
Summary of Contents for Allied Air 4AC18LT Series
-
Page 1: Table Of Contents
START-UP ... 13 OPERATION ... 17 MAINTENANCE ... 21 CONNECTION DIAGRAM ... 23 Issue 1008 TABLE OF CONTENTS Manufactured By Allied Air Enterprises, Inc. A Lennox International Inc. Company 215 Metropolitan Drive West Columbia, SC 29170 *506469-01* Page 1 of 24... -
Page 2: Installation Clearances
Electrical Code (U.S.) or Canadian Electrical Code (Canada). Compliance should be determined prior to installation. 4AC18LT condensing units use R410A which is an ozone- friendly HFC refrigerant. The unit must be installed with a matching indoor coil and line set. 4AC18LT units are designed for use in expansion valve (TXV) systems only. -
Page 3: Slab Mounting
• Install the unit high enough above the ground or roof to allow adequate drainage of defrost water and prevent ice buildup. • In heavy snow areas, do not locate the unit where drifting snow will occur. The unit base should be elevated above the depth of average snows. - Page 4 Placement Be aware that some localities are adopting sound ordinances based on how noisy the unit is at the neighbor’s home, not at the original installation. Install the unit as far as possible from the property line. When possible, do not install the unit directly outside a bedroom window.
- Page 5 506469-01 Refrigerant Piping If the 4AC18LT unit is being installed with a new indoor coil and line set, the refrigerant connections should be made as outlined in this section. If an existing line set and/or indoor...
- Page 6 6. Braze the line set to the service valve. Quench the joints with water or a wet cloth to prevent heat damage to the valve core and opening port. The tube end must stay bottomed in the fitting during final assembly to ensure proper seating, sealing, and rigidity.
- Page 7 Refrigerant Line Sets: Transition from Vertical to Horizontal Anchored Heavy Nylon Wire Tie Wall Stud Vapor Line Metal Sleeve Refrigeraant Line Sets: Installing Vertical Runs (new construction shown) NOTE: Similar installation practices should be used if line set is to be installed on exterior of outside wall.
- Page 8 Flushing Existing Line Set and Indoor Coil This procedure should not be performed on systems which contain contaminants, such as compressor burn out. Required Euipment The following equipment is needed to flush the existing line set and indoor coil (See Figure 9). Two clean R-22 recovery bottles, an oil-less recovery machine with a “pump down”...
- Page 9 R410A refrigerant and may prevent proper flushing. Use a field-provided fitting to reconnect the lines. 5. Remove the pressure tap valve cores from the 4AC18LT units service valves. Connect an R-22 cylinder with clean refrigerant to the suction service valve. Connect the R-22 gauge set to the liquid line valve and connect a recovery maching with an empty recovery tank to the gauge set.
- Page 10 3. Connect the external equalizer line to the equalizer port on the suction line and tighten to 8 ft.lbs. 4. Strap the superheat sensing bulb to the suction header. If installing an expansion valve on an indoor coil that previously used a fixed orifice, be sure to remove the existing fixed orifice.
- Page 11 Figure 12 WARNING Refrigerant can be harmful if inhaled. Refrigerant must always be used and recovered responsibly. Incorrect or irresponsible use of refrigerant can result in personal injury or death. WARNING Never use oxygen to pressurize refrigeration or air conditioning systems. Oxygen will explode on contact with oil and could cause personal injury or death.
- Page 12 4. Open both manifold valves and start vacuum pump. 5. Evacuate the line set and indoor unit to a minimum of 500 microns or lower. During the early stages of evacuation, it is desirable to close the manifold gauge valve at least once to determine if there is a rapid rise in pressure.
-
Page 13: Start-Up
START-UP CAUTION If unit is equipped with a crankcase heater, it should be energized 24 hours before unit start-up to prevent compressor damage as a result of slugging. 1. Rotate fan to check for frozen bearings or binding. 2. Inspect all factory and field-installed wiring for loose connections. - Page 14 1. Connect the manifold gauge set to the service valve ports as follows (See Figure 13): • Low pressure gauge to suction line service valve • High pressure gauge to liquid line service valve 2. Close manifold gauge set valves. Connect the center manifold hose to an upright cylinder of R410A.
- Page 15 R410A Temperature/Pressure Chart T e m p . P re s s u re T e m p . P re s s u re P s ig P s ig 1 0 0 .8 2 1 4 .0 1 0 2 .9 2 1 7 .4 1 0 5 .0 2 2 0 .9...
- Page 16 Table 8 506469-01 Issue 1008 Page 16 of 24...
-
Page 17: Operation
ON position, the indoor blower operates continuously. System Diagnostic Module 4AC18LT units contain a diagnostic module for troubleshooting air conditioning system failures. By monitoring and analyzing data from the compressor and thermostat demand, the module can accurately detect the cause of electrical and system related failure without any sensors. -
Page 18: Flash Codes
Flash Codes Table 9 506469-01 Issue 1008 Page 18 of 24... - Page 19 Flash Codes (cont.) Table 10 506469-01 Issue 1008 Page 19 of 24...
- Page 20 Miswired Module Troubleshooting Table 11 506469-01 Issue 1008 Page 20 of 24...
-
Page 21: Maintenance
MAINTENANCE WARNING Before performing maintenance operations on system, turn the electric power to unit OFF at disconnect switch(es). Unit may have multiple power supplies. Electrical shock could cause personal injury or death. Maintenance and service must be performed by a qualified installer or service agency. -
Page 22: Start-Up And Performance Checklist
Job Name _____________________________ Job Location ___________________________ Installer _______________________________ Unit Model No. _________________________ Service Technician _______________________ Rated Load Ampacity _________ Maximum Fuse or Circuit Breaker ________________________ Electical Connections Tight? Indoor Blower RPM ___________________ Outdoor Coil Entering Air Temperature ________ Discharge Pressure __________________ Vapor Pressure ____________ Refrigerant Charge Checked? Refrigerant Lines: Leak Checked? Service Valves: Fully Opened? -
Page 23: Wire Diagram
WIRE DIAGRAM 506469-01 Issue 1008 Page 23 of 24... - Page 24 NOTES 506469-01 Issue 1008 Page 24 of 24...
Need help?
Do you have a question about the 4AC18LT Series and is the answer not in the manual?
Questions and answers