Panasonic U-72MF2U9 Service Manual

Also see for U-120MF2U9: Installation instructions Operating instructions Installation instructions Technical data

Contents

3WAY VRF SYSTEMControl Functions1 - 301234567898. Oil Control3WAY SYSTEMControl Functions8. Oil Control8-5-1. Start of system oil recovery control8-5-2. Simplified flow of system oil recovery controlWhen operating compressor oil level 0System oil recovery control shall be performed as the flow mentioned below.Surely perform this system control by cooling cycle.Even if the outdoor unit heat exchanger is functioning as an evaporator (all heating mode or mixed cooling/heating operation), change the outdoor unit, indoor unit and solenoid valve kit to the cooling cycle and performthe system oil recovery control.(0) Normal operation(1) Pre-processing time of system oil recovery control for 2.5 minutes(2) System oil recovery control processing time* 1(3) Post-processing time of system oil recovery control for 2 minutes(4) Normal operationWhole process*1 System oil recovery control process* If just before the operation is in heating mode or cooling/heating mixed operation mode, system oil recoverycontrol may sometimes be performed by only 1st heat exchanger or all heat exchanger.When operating inverter compressor oil level less than 1 is counted with accumulation for up to 60 minutes.All outdoor units operate at maximum horsepower.Valves at all indoor units operate at a fixed pulse according to theindoor unit capacity.Valve kits at all indoor units operate in cooling mode (ON status).Control timeOutdoor unitsExpansion valveSolenoid valve kitFanStop and cooling (thermostat ON/OFF) and/or heating (thermostat ON)operation of indoor units will be followed the indoor unit control system.The fan speed of the heating thermostat OFF Concealed Duct - HighStatic type indoor unit (Type E1) is changed to LL.Fan and/or heating (thermostat OFF) operation of indoor unit will bestopped.All Indoor Units3 minutes8-5. System Oil Recovery ControlSpecial control : System Oil Recovery Control features one of the functions of special control.