Samsung AM072BXV Series Service Manual page 75

Troubleshooting
4-2 Service Operation (cont.)
4-2-1 Special Operation (cont.)
■ Piping Inspection Operation
Operation mode to check the status of the piping between the MCU and the indoor unit.
►
MCU pipe connection check
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- How to start : Press K2 4time (Heat Recovery only)
※ In heat pump model : select trial operation mode in cooling or heating mode automatically
- Operation sequence
Cooling
Heating
- Display
1. Starting P i P E ↔ C o o
2. Starting
A B C D ↔ E F G H
3. Finishing H O L D
4. Result- Normal communication or E
※ When we have E
IDU address checked & IDU address temp changed(00--)
※ E190- No or wrong IDU's Evap in temp changed
※ E191- No or wrong IDU's Evap out temp changed
Heat Pump Model : Outdoor temperature is more than 15°C / Cooling Auto Trial Operation start
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Outdoor temperature is less than 15°C / Heating Auto Trial Operation start
■ Discharge Mode Operation
Outdoor power is turned off, the Inverter PBA charging a high DC voltage, so dangerous to touch.
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- To replace the PBA, 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.
(Natural discharge until Please wait for at least 15 minutes.)
Block the Inverter PBA 3-phase relay after connected the power, and through compressor, DC voltage is discharging.
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- 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 PBA is being blocked, communication function is blocked, E206 will occur.
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If want operation again after complete discharge mode : Restart after K3 key to Reset or Power Reset.
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■ Forced defrost operation
Forced defrost operation : Is operation when Frost Formation occurs in the outdoor. (When carried out the service)
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Method of Entry
Start pattern
Defrost start
Defrost off
Etc.
Samsung Electronics
OUD
Normal operation
Normal operation
L
r r
P press K2 to see more information Error code(E190) → MCU address & port (C00A) →
r r
Defrost start : It is after 10 minutes which Safety Start finishes.
Defrost shut down and stop the normal pattern of the outdoor unit stop.
IDU for checking
Fan on / EEV open
Fan on / EEV close
or P i P E ↔ H E A T
A , B : Checking IDU address
C , D : IDU which evap in temp changed, "--" means none
E , F : no display
G , H : IDU which evap out temp changed, "--" means none
P
K2 Tact Switch 7 times
Heating Trial Operation pattern
General defrost operation conditions are the same as.
Other IDUs
Fan on / EEV close Evap in temp-lowest
Fan on / EEV open Evap out temp-lowest
Check point
69