It is important to maintain the unit correctly, adhere to the following:
• Do not allow dirt to accumulate on the outdoor coils or other parts in the air circuit. Clean as
often as necessary to keep the unit clean. Use a brush, vacuum cleaner attachment, or other
suitable means.
• The outdoor fan motor is permanently lubricated and does not require periodic oiling.
• If the coil needs to be cleaned, use clean water to wash dust, dirt, and debris from outdoor coil.
• Refer to the furnace or air handler instructions for filter and blower motor maintenance.
• The indoor coil and drain pan must be inspected and cleaned regularly to prevent odors and
assure proper drainage.
Required procedures for A2L systems
The following procedures are required for A2L systems:
Table 11: A2L required procedures
Procedure A2L
Safely remove refrigerant, following local and
national codes.
Required
Purge circuit with inert gas (oxygen-free
nitrogen).
Required
Evacuate the refrigerant. Required
Repair the system and purge with nitrogen
during brazing.
Required
Leak test and pressure test the unit. Required
Evacuate the system. Required
Charge the system. Required
Decommissioning
Before you begin:
Before attempting the procedure, complete the following:
• Ensure that the technician is completely familiar with the equipment and all its detail.
• Ensure to safely recover all refrigerants.
• Take an oil and refrigerant sample, in case analysis is required before reusing the recovered
refrigerant.
• Ensure that electrical power is available.
• Ensure that mechanical handling equipment is available, if required, for handling refrigerant
cylinders.
• Ensure that all personal protective equipment is available and being used correctly.
• Ensure that the recovery process is supervised at all times by a competent person.
• Ensure that recovery equipment and cylinders conform to the appropriate standards.
Follow the steps below to ensure the unit is correctly and safely decommissioned:
1. Isolate the system electrically.
2. Connect a recovery machine to remove refrigerant from the system.
3. Ensure that the cylinder is situated on the scales before recovery takes place.
Installation Manual: R-454B Outdoor Split-System Air Conditioner46
Johnson Controls Ducted Systems
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