Location of 4way valve connector on
Main / Sub PCB (marked as 4way)
** Confirm the 4way valve coil is inserted to the end
*
Measure the resistance of 4way valve
**** Check the output voltage of terminal socket
during heating operation
*** When power is supplied in order as follow
(Sub2 ➠ Sub1 ➠ Main)
3
rd
number indicates outdoor quantity at Main PCB
7-segment LED
- Outdoor unit 1set : 44-capacity(or 10)-..
- Outdoor unit 2set : 44-50-capacity(or 20)-..
- Outdoor unit 3set : 44-50-50-capacity(or 30)- ..
***** Checking method for outdoor unit of 3unit system
(Main + Sub1 + Sub2)
➀ Close all the SVC valves of high / low pressure com-
mon pipe
➁ Operate system
➂ Check the difference of high and low pressure with
LGMV for each unit (Main, Sub1, Sub2)
➃ If there is a unit in which the difference is not
increased then the 4way valve of that unit is defective
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