SERVICE MANUAL - BVT Partners OÜ

'11 • SCM-SM-110(23) Anomalous power transistor (SCM100, 125 only)When anomalous rise of the power transistor temperture is detected for 15 minutes continuosly.(24) Power transistor overheat protection (SCM100, 125 only)(a) Purpose: Prevention of malfunction, deterioration, breakage, etc. of the control(b) Contents of restrictionRestricts the speed of compressor when the temperature of power transistor (Tho-AF) rises higher than 90°C.Tho-AF < 80°C 80°C < = Tho-AF < 90°C 90°C < = Tho-AF < 110°C 90°C < = Tho-AF < 110°C Tho-AF < = 110°CProtection control speed (NP) Normal Retention NP-2rps NP-4rps 0rpsSampling time (s) Normal 20 20 20 −(c) Resetting conditionWhen the power transistor temperature is lower than 90°C or when the compressor has stopped.(d) Anomalous stopIt stops anomalously if it occurs 2 times within 60 minutes or it has elapsed 60 minutes after the first establishment of the condition.(25) Control of the flowing noise of refrigerant during cooling operation (SCM100, 125 only)In order to suppress the flowing noise of refrigerant when operating 1 unit of indoor unit, the compressor is operated at theMax speed of 40 rps if the dip switch (J31) on the outdoor sub-PCB is set to open.- 49 -