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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.
506254-01
4SCU18LT SERIES
Split System Air Conditioner
Save these instructions for future reference
WARNING
INSTALLATION ...................................... 2
START-UP ............................................ 13
OPERATION ........................................ 17
MAINTENANCE ................................... 21
CONNECTION DIAGRAM ................... 23
WARRANTY ......................................... 24
A Lennox International Inc. Company
Issue 0912
TABLE OF CONTENTS
Manufactured By
Allied Air Enterprises, Inc.
215 Metropolitan Drive
West Columbia, SC 29170
*506254-01*
Page 1 of 25
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Summary of Contents for Allied 4SCU18LT Series
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Page 1: Table Of Contents
Installation and service performed Manufactured By by unqualified persons can result in property Allied Air Enterprises, Inc. A Lennox International Inc. Company damage, personal injury, or death. 215 Metropolitan Drive West Columbia, SC 29170... -
Page 2: Installation
INSTALLATION When servicing or repairing HVAC components, ensure the fasteners are appropriately tightened. Table 1 shows torque values for fasteners. General Read this entire instruction manual, as well as the Inspection of Shipment instructions supplied in separate equipment, before Upon receipt of equipment, carefully inspect it for possible starting the installation. - Page 3 • Install the unit high enough above the ground or roof to If unit coil cannot be mounted away from prevailing winter allow adequate drainage of defrost water and prevent winds, a wind barrier should be constructed (See Figure 3). ice buildup.
- Page 4 Refrigerant Piping Thermostat Designations If the 4SCU18LT 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 coil will be used to complete the system, refer to this section as well as the section that follows entitled - Flushing Existing Line Set and Indoor Coil.
- Page 5 Placement Brazing Connection Procedure Be aware that some localities are adopting sound ordinances 1. Cut ends of refrigerant lines square (free from nicks or based on how noisy the unit is at the neighbor’s home, not dents). Debur the ends. The pipe must remain round; do at the original installation.
- 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 CAUTION valve core and opening port. The tube end must stay When flushing existing line set and/or indoor coil, be sure to bottomed in the fitting during final assembly to ensure empty all existing traps.
- Page 7 Figure 7 Figure 8 506254-01 Issue 0912 Page 7 of 25...
- Page 8 Flushing Existing Line Set and Indoor Coil If the existing outdoor unit is equipped with manual shutoff This procedure should not be performed on systems valves AND new R-22 refrigerant will be used to flush the which contain contaminants, such as compressor burn system: out.
- Page 9 4. Remover the existing R-22 refrigerant flow control orifice An R410A system will not operate properly with an R-22 or thermal expansion valve before continuing with flushing metering device. procedures. R-22 flow control devices are not approved for use with R410A refrigerant and may prevent proper flushing. Install the refrigerant metering device as shown in Figure Use a field-provided fitting to reconnect the lines.
- Page 10 3. Connect the external equalizer line to the equalizer port Suction Line (Ball Type) Service Valve on the suction line and tighten to 8 ft.lbs. Suction line (ball type) service valves function the same way as the other valves; the difference is in the construction (See 4.
- Page 11 3. Open the high pressure side of the manifold to allow R410A into the line set and indoor unit. Weigh in a trace amount of R410A. (A trace amount is a maximum of 2 oz. of refrigerant or 3 lbs. pressure.) Close the valve on the R410A cylinder and the valve on the high pressure side of the manifold gauge set.
- 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.
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Page 13: Start-Up
START-UP Units are factory charged with the amount of R410A refrigerant indicated on the unit rating plate. This charge is based on a matching indoor coil and outdoor coil with 15’ CAUTION line set. For varying lengths of line set, refer to Table 5 for refrigerant charge adjustment. - Page 14 1. Connect the manifold gauge set to the service valve ports Blocking Outdoor Coil 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 Subcooling Values R410A Temperature/Pressure Chart Table 7 6. Compare the approach value with those shown in Table 7. If the values do not agree with those provided in Table 7, add refrigerant to lower the approach temperature or recover refrigerant from the system to increase the approach temperature.
- Page 16 Normal Operating Pressures Low Capacity Outdoor Coil Entering Air Temp. °F High Capacity Outdoor Coil Entering Air Temp. °F Table 8 506254-01 Issue 0912 Page 16 of 25...
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Page 17: Operation
OPERATION Thermostat Demand Wiring The diagnostic module requires a thermostat demand signal to operate properly. The thermostat demand signal input, Outdoor unit and indoor blower cycle on demand from the labeled Y on the module, should always be connected to room thermostat. - Page 18 Flash Codes Table 9 506254-01 Issue 0912 Page 18 of 25...
- Page 19 Flash Codes (cont.) Table 10 506254-01 Issue 0912 Page 19 of 25...
- Page 20 Miswired Module Troubleshooting Table 11 506254-01 Issue 0912 Page 20 of 25...
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Page 21: Maintenance
MAINTENANCE 4. Check all wiring for loose connections. 5. Check for correct voltage at unit (with unit operating). WARNING 6. Check amp-draw on belower motor. Before performing maintenance operations on system, Unit nameplate_____________ Actual _________ turn the electric power to unit OFF at disconnect switch(es). - Page 22 Start-Up and Performance Checklist Job Name _____________________________ Job No. ____________ Date ___________ Job Location ___________________________ City _______________ State ___________ Installer _______________________________ City _______________ State ___________ Unit Model No. _________________________ Serial No._____________________________ Service Technician _______________________ Nameplate Voltage _____________________ Rated Load Ampacity _________ Compressor Amperage ________ Outdoor Fan __________ Maximum Fuse or Circuit Breaker ________________________...
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Page 23: Connection Diagram
WIRE DIAGRAM 506254-01 Issue 0912 Page 23 of 25... -
Page 24: Warranty
All covered heat exchangers are warranted by Allied Air for a period of twenty (20) years from the date of original installation. Heat Exchanger Availability: If a replacement heat exchanger is no longer available for a unit covered by this warranty, Allied Air will allow a credit toward the purchase of an equivalent Allied Air furnace (at the current suggested distributor’s cost). - Page 25 LIMITED EXTENDED PARTS WARRANTY Allied Air Enterprises, Inc. (“Allied”) provides its air conditioning and heating products with a standard five-year parts warranty. This limited extended parts warranty is in addition to and is intended to supplement Allied’s standard 5-year parts warranty. As such, this limited extended warranty provides for a total of 10-years of limited warranty coverage (Standard 5-Year Limited Parts Warranty plus Additional 5-Year Limited Extended Parts warranty).
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