Test Operation
Samsung Electronics
311
4) Pressure sensor (when only one outdoor unit is installed)
∙
What to inspect: Pressure sensors (high and low pressures)
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Error code: None ("NG" is only indicated in the result report)
∙
How to determine error: Check the pressure difference between the high and low pressure sensors before
the compressors are started.
∙
Perform inspection according to the steps shown below.
■
Precautions
- 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.
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.
Replace the Hub PBA.
Replace the pressure sensor.
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 terminal* on the Hub PBA 5V?
Is the actua
pressure* different from the value
on the pressure sensor?
Perform Auto Trial Operation again.
Yes
No
Yes
No
No
No
Yes
* Pressure sensor terminal
Pin # 1 is indicated by
▼
.
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.)
