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Allied Air Enterprises 4AC18LT - page 1
506469-01 Issue 1008 Page 1 of 24 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 ...
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Allied Air Enterprises 4AC18LT - page 2
506469-01 Issue 1008 INST ALLA TION When servicing or repairing HV AC components, ensure the fasteners are appropriately tightened. T able 1 shows torque values for fasteners. Inspection of Shipment Upon receipt of equipment, carefully inspect it for possible shipping damage. If damage is found, it should be noted on the carrier ’s freight bill. ...
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Allied Air Enterprises 4AC18LT - page 3
506469-01 Issue 1008 Roof Mounting Install unit at a minimum of 6” above surface of the roof to avoid ice buildup around the unit. Locate the unit above a load bearing wall or area of the roof that can adequately support the unit. Consult local codes for rooftop applications. • Install the unit high enough above the ground or roof to allow adeq ...
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Allied Air Enterprises 4AC18LT - page 4
506469-01 Issue 1008 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 . Glass has a verry high level of ...
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Allied Air Enterprises 4AC18LT - page 5
506469-01 Issue 1008 Refrigerant Piping If the 4AC18L T 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 Exi ...
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Allied Air Enterprises 4AC18LT - page 6
506469-01 Issue 1008 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 sta y bottomed in the fitting during final assembly to ensure proper seating, sealing, and rigidity . 7. Install the thermal exp ansion valve which is sold separate ...
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Allied Air Enterprises 4AC18LT - page 7
506469-01 Issue 1008 Page 7 of 24 Figure 8 Outside W all W ood Block Between Studs IMPOR T ANT: Refrigerant lines must not contact wall. V apor Line Liquid Line Wire Tie Inside W all Strap Slee ve Wire Tie Wire Tie Strap W ood Block Slee ve V apor Line Wrapped with Armaflex Liquid Line Caulk PVC Pipe Fiberglass Insulation Outside W all IMPOR T ANT: ...
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Allied Air Enterprises 4AC18LT - page 8
506469-01 Issue 1008 Flushing Existing Line Set and Indoor Coil This procedure should not be performed on systems which contain cont aminants, such as compressor burn out. Required Euipment The following equipment is needed to flush the existing line set and indoor coil (See Figure 9). T wo clean R-22 recovery bottles, an oil-less recovery machine ...
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Allied Air Enterprises 4AC18LT - page 9
506469-01 Issue 1008 4. Remover the existing R-22 refrigerant flow control orifice or thermal expansion valve before continuing with flushing procedures. R-22 flow control devices are not approved for use with R410A refrigerant and may prevent proper flushing. Use a field-provided fitting to reconnect the lines. 5. Remove the pressure tap valve cor ...
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Allied Air Enterprises 4AC18LT - page 10
506469-01 Issue 1008 3. Connect the external equalizer line to the equalizer port on the suction line and tighten to 8 ft.lbs. 4. S trap the superheat sensing bulb to the suction header . If installing an exp ansion valve on an indoor coil that previously used a fixed orifice, be sure to remove the existing fixed orifice. Failure to remove a fixed ...
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Allied Air Enterprises 4AC18LT - page 11
506469-01 Issue 1008 Using an Electronic Leak Detector 1. Connect the high pressure hose of the manifold gauge set to the suction valve service port. (Normally the high pressure hose is connected to the liquid line port; however , connecting it to the suction ports helps to protect the manifold gauge set from damage caused by high pressure.) 2. Wit ...
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Allied Air Enterprises 4AC18LT - page 12
506469-01 Issue 1008 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. A rapid rise in pressure indicates a relati ...
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Allied Air Enterprises 4AC18LT - page 13
506469-01 Issue 1008 ST ART -UP 1. Rotate fan to check for frozen bearings or binding. 2. Inspect all factory and field-installed wiring for loose connections. 3. A f ter evacuation is complete, open liquid line and suction line service valves to release refrigerant charge (contained in outdoor unit) into system. 4. Replace the stem caps and secure ...
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Allied Air Enterprises 4AC18LT - page 14
506469-01 Issue 1008 5. Compare the subcooling value with those shown in T able 6 on page 14. If subcooling is greater than shown, recover some refrigerant. If subcooling is less than shown, add some refrigerant. Charge Using Approach Method - Outdoor Temperatures 65°F or Above The following procedure is intended as a general guide and is for use ...
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Allied Air Enterprises 4AC18LT - page 15
506469-01 Issue 1008 Page 15 of 24 6. Compare the approach value with those shown in T able 7. If the values do not agree with those provided in T able 7, add refrigerant to lower the approach temperature or recover refrigerant from the system to increase the approach temperature. Check Charge Using Normal Operating Pressures Use T able 8 to perfor ...
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Allied Air Enterprises 4AC18LT - page 16
506469-01 Issue 1008 Page 16 of 24 T able 8 ...
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Allied Air Enterprises 4AC18LT - page 17
506469-01 Issue 1008 OPERA TION Outdoor unit and indoor blower cycle on demand from the room thermostat. When the thermostat blower switch is moved to the ON position, the indoor blower operates continuously . System Diagnostic Module 4AC18L T unit s contain a diagnostic module for troubleshooting air conditioning system failures. By monitoring and ...
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Allied Air Enterprises 4AC18LT - page 18
506469-01 Issue 1008 Page 18 of 24 T able 9 Flash Codes ...
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Allied Air Enterprises 4AC18LT - page 19
506469-01 Issue 1008 Page 19 of 24 T able 10 Flash Codes (cont.) ...
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Allied Air Enterprises 4AC18LT - page 20
506469-01 Issue 1008 Page 20 of 24 T able 1 1 Miswired Module T roubleshooting ...
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Allied Air Enterprises 4AC18LT - page 21
506469-01 Issue 1008 MAINTENANCE Maintenance and service must be performed by a qualified installer or service agency . At the beginning of each cooling season, the system should be checked as follows: 1. Clean and inspect condenser coil. Coil may be flushed witha a water hose. Be sure the power is off before usig water to clean the coil. 2. Outdoo ...
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Allied Air Enterprises 4AC18LT - page 22
506469-01 Issue 1008 St art-Up and Performance Checklist Job Name _____________________________ Job No. ____________ Date ___________ Job Location ___________________________ City _______________ S tate ___________ Installer _______________________________ City _______________ S tate ___________ Unit Model No. _________________________ Serial No.__ ...
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Allied Air Enterprises 4AC18LT - page 23
506469-01 Issue 1008 Page 23 of 24 WIRE DIAGRAM ...
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Allied Air Enterprises 4AC18LT - page 24
506469-01 Issue 1008 Page 24 of 24 NOTES ...
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