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Standard HP: Y piping for heat pump application
Standard HR: Piping for heat recovery application
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Piping Design
HR Changer
Paired ports
to increase
capacity
Refrigeration piping:
•
All piping specifications must be followed to insure that the system will
operate properly.
•
Maintain a minimum straight line distance: ≥ 20" before connecting to
a Y-joint.
•
Minimum 36" straight line between Y-joints.
▪
HR Changer: Mandatory device for indoor unit mode changeover
▪
HR Changer is installed as the first device in the refrigerant piping
network. (Heat recovery only)
▪
Cool-only indoor unit is connected to the HR Changer low pressure
gas and liquid outgoing pipes.
▪
Sub MCU required for additional indoor unit zones after the HR
Changer
Sub MCU
Cool-only unit
2
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