... operation.Displays error code when having problem,easy for maintenance.4. World famous brand compressor,4-way valve,motor,PCB,heat exchanger ... steel case are available,R22,R407C,R410a,R417A,R134A are for optional.7. Simple installation: rooftop, balcony, yard or basement can ... be suitable places for the installation.8. Quiet: Special design for motor and fan to decrease noise, no ...