Test Operation
Samsung Electronics 289
8) 4-way valve
∙ What to inspect: Outdoor unit's 4-way valve operation
∙ Error code: None (“NG” is only indicated in the result report)
∙ How to determine error: Check the vari
ations of pressure when the 4-way valve is operating.
∙ Perform inspection according to the steps shown below.
Ŷ 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, exercis
e extra care to prevent electric shock.
Does the result
of Auto Trial Operation show that the
pressure sensors are properly
functioning?
Is the 4-way
valve connector properly connected to
the PBA?
Is
the pin-to-pin
voltage of the 4-way valve terminal on
the Hub PBA 220V?*
Is the coil
of the 4-way valve properly
functioning?
Perform Trial Operation (cooling/heating
)
- See the instructions on Key operation modes.
Is a symptom
caused by malfunction of
the 4-way valve
present?
Is the operation cycle normal?
Perform Auto Trial Op
eration again.
Replace the body of the
4-way valve*
* Perform inspection at least twice before
replacing the 4-way valve.
Take corrective measures.
Take
corrective measures.
Take corrective measures.
Replace the Hub PBA.
∙ After completing trial operation in heating mode, measure the pin-to-pin
volt
age on the 4-way valve terminal (there is no output in the terminal
after trial operation in cooling mode is turned off).
Replace the coil.
Yes
Ye
s
Yes
Yes
Yes
No
No
No
No
No
No
Yes
9-1 Auto Trial Operation (cont.)
9-1-3 How to resolve NG items (cont.)
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