Samsung AM080FXWANR Service Manual page 285

Test Operation
9-1 Auto Trial Operation (cont.)
9-1-3 How to resolve NG items (cont.)
3) Pressure sensor (when the outdoor unit is installed with two or more modules)
∙ What to inspect: Pressure sensors (high and low pressures)
∙ Error code:
- High pressure sensor: E505 ("NG" is indicated in the result report)
- Low pressure sensor: E506 ("NG" is indicated in the result report)
∙ How to determine error: Check the pressure difference between the high pressure sensors on each outdoor unit as well as
the pressure difference between the low pressure sensors on the outdoor unit before the compressors are started.
∙ Perform inspection according to the steps shown below.
Keep all the outdoor units in vacuum mode for 5 min.
- See the instructions on Key operation modes
No
between pressure sensors on outdoor units
(service valve) on each outdoor unit
sensor connectors properly connected
voltage between pins # 3 and 4 of the pressure
sensor terminal* on the Hub PBA 5V?
pressure* different from the value on
Perform Auto Trial Operation again.
Precautions
- If an error occurs, Auto Trial Operation stops immediately.
An error may occur if there is an air temperature difference between the areas where outdoor units are installed.
Use the blower to regulate the air temperature to a similar level.
- To replace a component or inspect the PBA, be sure to cut off the power supply first.
If inspection must be performed with the power supply on, exercise extra care to prevent electric shock.
Samsung Electronics
Is the deviation
greater than 0.2MPa?
Yes
Is the ball valve
opened?
Yes
Are the pressure
to the PBA?
Yes
Is the pin-to-pin
Is the actual
the pressure sensor?
Yes
No
No
Take corrective measures.
No
Replace the Hub PBA.
* Pressure sensor terminal
Pin # 1 is indicated by
Measure the voltage between pins # 3 and 4.
No
Replace the pressure sensor.
* The actual pressure can be checked by calculating
the saturation pressure for the outdoor air tem-
perature or connecting a manifold gauge.
Open the valve.
.
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