Samsung AM032MNQDCH/AA Service Manual page 205

Vacuum Operation
Operation to facilitate vacuum to open the valve after the Outdoor Unit repair.
How to Initiate
Compressor
Indoor Unit/Outdoor Fan
4Way Valve
Valves
Etc.
Piping Inspection Operation
Operation mode to check the status of the piping between the MCU and the indoor unit.
Heat Pump Model : Outdoor temperature is more than 15°C / Cooling commissioning start
Outdoor temperature is less than 15°C / Heating commissioning start
Discharge Mode Operation
Outdoor power is turned off, the Inverter PCB and Fan PCB charging a high DC voltage, so dangerous to touch.
- To replace the PCB, first turn off the power and the begin if DC voltage is discharged.
- If not use the discharge mode, the discharge time of about 15 minutes takes.
- If an error occurs, the discharge mode may not properly run. (Wait until natural discharge.)
- In particular, E 464, E364, power devices may be damaged, therefore do not use the discharge mode.
Block the Inverter PCB 3-phase relay after connected the power, and through compressor, DC voltage is discharging.
- INV1 and INV2 DC voltage during discharge mode are displayed alternately.
- Discharge mode Display (Rotate the three page display, as shown below.)
'K' 'A' ' ' ' ' DC Link Volt1 ( For example, 120[V] 0 1 2 0 display)
DCLinkVolt2 ( For example, 120[V] 0 1 2 0 display) 'K' 'A' ' ' ' ' DC Link Volt1 ...
Discharge is complete, the power of the Inverter PCB and Fan PCB is being blocked, communication function is blocked, E206 will
occur.
If want operation again after complete discharge mode : Restart after K3 key to Reset or Power Reset.
Samsung Electronics
K1 Tact Switch 7 times~11 times
OFF
OFF
OFF
Open all valves maximum
If not turn off the vacuum mode, the start of normal operation is prohibited.
Troubleshooting
4-5