Samsung AM072BXV Series Service Manual page 240

Piping Diagram
7-3 Functions (cont.)
7-3-2 Control (cont.)
7-3-2-2 Start-up modes (cont.)
Safety Start – Normal Start
▪ Purpose
Stable start-up in a low-temperature section with overload
▪ Concept
Compressors start in sequential order to ensure stable operation if the indoor unit operation ratio is low or there is an overload.
▪ Control specifications in detail
- Condition(s) required to enter Normal Start mode : None of the conditions required to enter Quick Start mode are satisfied.
- In Normal Start mode, compressors are controlled as shown below.
(See the chart below for conditions required to complete specific steps)
- Condition(s) required to enter Normal Operation mode : [ A or B ]
A. DSH > 10 K
- Cold Operation mode will activate if none of the conditions required to enter Normal Operation mode are satisfied.
- In Cold Operation mode, the compressor frequency increase speed is restricted to 1Hz per 30 sec.
- Condition(s) required to close Cold Operation mode: [ A or B ]
A. A maximum of 30 min has elapsed
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B. Max (Tdis, Ttop) ≥ 30℃
B. DSH > 15 K
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