Liquid Receiver:
- Location: In the liquid line immediately after the condenser.
- Purpose: Provides a storage tank for liquid refrigerant.
- Capacity: Equal to the full charge of the system plus 20%.
- Usage: Used in systems with expansion valves to manage varying load conditions.
- Operation: Liquid enters from the condenser and is drawn from the bottom of the receiver through a dip tube to the liquid line and the thermostatic expansion valve (TXV).
- King Valve:
- Location: Outlet of the receiver.
- Purpose: Acts as a service port to check high side pressure and to pump the system down.
- Positions:
- Cracked: For checking system pressures.
- Front Seated: For pump down mode, prevents refrigerant from leaving the receiver, and allows the compressor to pump all refrigerant into the receiver for maintenance.
- Back Seated: Full flow from the receiver into the liquid line.
- Service: Use the king valve to measure high side pressure and pump down the system for maintenance.
Suction Line Accumulator:
- Location: In the suction line, usually just before the compressor.
- Purpose: Prevents liquid floodback to the compressor by capturing and evaporating liquid refrigerant.
- Usage: Commonly used in heat pumps, freezers, and systems with hot gas defrost.
- Operation:
- Liquid refrigerant enters and accumulates at the bottom.
- Boiled off vapor is returned to the compressor.
- Provides oil separation and return through a small hole at the bottom of the tube.
- Maintenance: Accumulator should not be insulated to allow heat absorption for boiling off liquid. Replace if rusted to prevent leaks.
General Notes:
- Liquid Receiver:
- Located after the condenser.
- Stores refrigerant for varying loads.
- King valve used for system pressure checks and pump down.
- Accumulator:
- Located before the compressor.
- Prevents liquid floodback.
- Used in systems with hot gas defrost and low superheats.
- Requires proper maintenance and inspection for rust.
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