Function; Protection - Heat Controller SMA Service Manual

9.3 Function

Remote receiving
Testing and forced running
Position set for indoor unit wind vane
LED displaying and alarm
On or off Timer
Protection for the compressor
Current protection
High temperature protection of indoor heat exchanger at heating mode
Auto defrosting and heating recovery at heating mode
Anti cold air at heating mode

9.4 Protection

9.4.1 3 minutes delay at restart for compressor.
9.4.2 Sensor protection at open circuit and breaking disconnection
9.4.3 Fan Speed is out of control. When Indoor Fan Speed is too high(higher than High
Fan+300RPM)or too low(lower than 400RPM), the unit stops and LED displays failure information
and can't returns to normal operation automatically.
9.4.4 Cross Zero signal error warning. If there is no Cross Zero signal in 4 minutes, the unit stops
and LED displays failure information and can't return to normal operation automatically.
9.4.5 The current protection of the compressor
If compressor turns off for continuously 4 times due to current protection in 5 minutes from
Compressor On, the unit stops and LCD displays failure information and can't returns to normal
operation automatically.
Service manual
Heat Controller, Inc. Jackson, MI 49203
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