Samsung Electronics 212
Piping Diagram
Safety Start – Cold Start
ƒ Purpose
Protect the system and compressors by preventing poor lubrication due to liquid compression or oil foaming.
ƒ Concept
- A low start-up frequency is used to protec
t the compressors from liquid compression as well as poor lubrication due to oil foaming.
- After the Cold Start process, Cold Operation mode is on for a ma
ximum of 60 minutes to decrease the compressor frequency
increase speed until DSH is secured. This prevents liquid compression.
ƒ Control specifications in detail
- Condition(s) requir
ed to enter Cold Start mode : [ (A or B) & C & D ]
B. Max (Ttop, Tdis) < 30ఁ
C. Less than 12 hours after the power supply
D. Cooling : Water temp. <20ఁ
, Heating : Water temp. < 10ఁ
- In Cold Start mode, the target SH of 6 K is regulated and compressors are controlled as shown below.
(See the cha
rts below for conditions required to complete specific steps)
In Cold Operation mode, the compressor frequency increase speed is restricted to 1Hz per
60 sec.
Condition(s) required to close Cold Operation mode: [ A or B ]
A. A maximum of 60 min has elapsed
B. DSH > 15 K
If one compressor is ON If two compressors are ON
7-3 Functions (cont.)
7-3-2-2 Start-up modes (cont.)
7-3-2 Control (cont.)
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