Si33-105 Troubleshooting
Troubleshooting R407C PLUS Series Heat Recovery System 189
3.33 R22 & R407C Indoor Unit - mixed Connection
Remote
Controller
Display
UA
&
U9
Supposed
Causes
R22 model connection abnormalities
Troubleshooting 1. When R22 indoor unit is connected to HFC (R407C) system
Reason : Operation disallowed due to insufficient pressure proof in R22 indoor unit.
2. When HFC indoor unit is connected to R22 system
Reason : Operation disallowed to prevent contamination of another system by HFC indoor unit
operated previously with R22 system. If HFC indoor unit that was operated with R22 system is
removed and connected to another HFC system, it can contaminate (SUNISO oil etc.) the newly
connected HFC system.
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