LENNOX 507472 Air Conditioner Coil Replacement Kit Instruction Manual

507472 Air Conditioner Coil Replacement Kit
Instruction Manual

Shipping and Packing List

Package 1 of 1 contains:
1 – Coil assembly
1 – Bag assembly
1 – Installation instruction
1 – 1/2″ coupling
1 – Discharge line
Check the replacement coil for shipping damage. If you find any damage, immediately contact the last carrier.

WARNING
Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Installation and service must be performed by a  licensed professional HVAC installer or equivalent, service agency, or gas supplier.

CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.

WARNING
To prevent personal injury, as well as damage to panels, units,s or structures, observe the following: While installing or servicing this unit, carefully stow all removed panels so that the panels will not cause injury to personnel, objects, or nearby structures. Also, take care to store panels where they will not be subject to damage (e.g., being bent or scratched). While handling or stowing the panels, consider any weather conditions (especially wind) that may cause panels to be blown around and damaged.

WARNING
Electric Shock Hazard. Can cause injury or death. The unit must be properly grounded in accordance with national and local codes.
Line voltage is present at all components when the unit is not in operation on units with single-pole contactors. Disconnect all remote electric power supplies before opening the access  panel. The unit may have multiple power supplies.

Requirements
Verify that the new coil has to hold a charge. Remove the cap from the discharge line and press the valve core.
The coil should have approximately a 10 psi dry air holding charge. If there is no charge, repressurize the coil and check for leaks.
Verify that the liquid and discharge manifold position matches that of the existing coil before removing the original coil. Take care not to damage the liquid line stub.

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Installation

CAUTION
Before attempting to perform any service or maintenance, turn the electrical power to the unit OFF at the disconnect switch.
IMPORTANT
The stub of the coil must be secured if any adjustments to the liquid line are needed. Do not allow it to move.

1. Disconnect all power to the unit.

2. Reclaim the refrigerant from the unit.

3. Remove the access panel, side (louvered) panels, top panel, and corner posts. Remove the screws that attach the coil endplate to the control box and compressor enclosure. Keep the screws.

4. Unscrew the liquid service and suction valve brackets from the corner mullion. Braze off the liquid line at the swaged joint next to the existing coil outlet.

5. Use a tubing cutter to cut the discharge line at the optimal location to facilitate the installation of the new coil.

6. Remove the existing coil.

7. Place replacement coil assembly inside the cabinet.

8. Remove the holding charge by pressing the valve core. Use a tubing cutter to cut off the discharge line to facilitate the installation of the new coil.
   ** IMPORTANT**
   Apply a wet cloth to the factory copper-to-aluminum joints and the pressure switch to prevent heat damage when brazing in the field copper-to-copper joints for the replacement coil. See figure 3.

9. Install new discharge line. See figure 3 for important precautions regarding brazing. Align the discharge line on the replacement coil with the discharge line from the compressor. Install the provided coupling between the two tubes. Braze the coupling into place.

10. Braze in the liquid line if required. Reattach the liquid and suction service valves.

11. Replace the screws that attach the coil endplate to the control box and compressor enclosure.

12. Replace applicable corner posts, side (louvered) panels, and top panels.

13. Refer to the unit installation instructions for leak testing, evacuation, and start-up procedures. Charge the unit as outlined in the installation instructions or according to the charging sticker.

14. Once installation of the replacement coil is complete, confirm that all refrigerant tubing and wiring is properly routed away from other wiring and sharp metal edges.

15. Replace the access panel.

IMPORTANT
OBSERVE THE FOLLOWING PRECAUTIONS TO PREVENT DAMAGE TO ALUMINUM SOLDER JOINTS OR PRESSURE SWITCH AND TRANSDUCER  WHEN REPLACING AN ALUMINUM OUTDOOR COIL

TO PREVENT DAMAGE TO ALUMINUM SOLDER JOINTS OR PRESSURE SWITCH AND TRANSDUCER, WET RAGS AND / OR THERMAL TRAP PASTE  MUST BE APPLIED TO THE AREAS HIGHLIGHTED BELOW BEFORE BRAZING. WET RAGS MUST BE LEFT ON PROTECTED AREAS UNTIL BRAZED JOINTS HAVE COOLED DOWN TO AMBIENT TEMPERATURE TO PREVENT MIGRATION OF HEAT INTO THE ALUMINUM SOLDERED JOINTS OR  PRESSURE SWITCH AND TRANSDUCER. FIGURE 3. Important Precautions for Coil Installation

Documents / Resources

| LENNOX 507472 Air Conditioner Coil Replacement Kit [pdf] Instruction Manual
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