Pump Down; Address Switches - Carrier P1 Plus series Owners And Installation Manual

PUMP DOWN

Pump down means collecting all the refrigerant in the system back into the outdoor unit without losing any refrigerant gas.
Pump down is used when the unit is moved or for servicing the refrigerant circuit.
• Close three-way valve halfway.
• Turn the unit on for approximately 3 minutes in cooling mode.

ADDRESS SWITCHES

If you are installing two indoor units in the same room, it is necessary for you to assign each unit its own address
so each can be operated by its own remote control. One address selector is in the PCB side and the other is
configured by remote controller. The address selector is set to A when you purchase the unit.
Remote control
• Refer the "remote control configuration" at page. 9
• Close two-way valve all the way.
• Close three-way valve all the way.
Indoor unit
• Turn off the unit and pull out the power plug.
• Remove the insert grille and terminal block cover.
• Assign the address selector of one indoor unit as B.
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