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[18] The 4-way valve of 3-pipe valve box reversing failure
If the 4-way valve of 3-pipe
valve box is internal leakage
Yes
No
No
No
Yes
Yes
Yes
No
No
Yes
Check if the TC1 and TC2 of indoor
unit are normal, if the resistance is
right? If the connect well?
If the 4-way valve of outdoor
unit is internal leakage
Replace the driver module, if it is normal
If exceeds the running range of the
outdoor unit
Adjust it correctly by after-sales
personnel on site.
Replace the driver module
If the pressure difference between
high and low pressure less than
0.4Mpa before the failure occurs,
replace the inverter compressor
Adjusting the running range
Adjust it correctly by after-sales
personnel on site.
Adjust it correctly by after-sales
personnel on site.
Note: abnomity conrmation conditions
For MRVIII-RC system, the outdoor unit is running normally, when the 4-way valve of valve box is
power on and its connected heating indoor unit's parameter satisfy following conditions
• & • When 4-way valve of valve box is ON
• TC2 ≤ CT-20
o
C lasts for 5min
• or • TC1 ≤ 0
o
C lasts for 5min
• TC1 ≤ master unit Ps_temp+10
o
C lasts for 5min
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