Samsung Electronics 284
Test Operation
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 pr
essure 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.
∙ P
erform inspection according to the steps shown below.
Ŷ Precautions
- If an error occurs, Auto Trial Operation stops immediately.
An error may occur if there is an air temperature difference between the areas whe
re 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 electri
c shock.
Keep all the outdoor units in vacuum mode for 5 min.
- See the instructions on Key operation modes
Is the deviation
between pressure sensors on outdoor units
greater
than 0.2MPa?
Take corrective measures.
Open the valve.
Replace the Hub PBA.
Replace the pressure sensor.
Is the ball valve
(service valve) on each ou
tdoor unit
opened?
Are the pressure
sensor connectors properly connected
to the PBA?
Is the pin-to-pin
voltage between pins # 3 and 4 of the pressure
sensor t
erminal* on the Hub PBA 5V?
Is the actual
pressure* different from the value on
the pressure sensor?
Perform Auto Trial Operation again.
Yes
Yes
Yes
Yes
No
No
No
No
No
* Pressure sensor terminal
Pin # 1 is indicated by ف .
Measure the voltage between pins # 3 and 4.
* The actual pressure can be checked by calculating
the saturation pressure for the outdoor air tem-
perature or connecting a manifold gauge.
9-1 Auto Trial Operation (cont.)
9-1-3 How to resolve NG items (cont.)
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