| System 7 |
System with constant flow in primery
and secondary circuits |
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| Functions |
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| -Primery Circuits :constant flow ,constant temperature |
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| -Secondary Circuits :constant flow,variable temperatur |
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| -Large boilers,air heating ,cooling coils |
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| -Pressure change in primery circuits do not affect |
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| secondary circuits |
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| Balancing |
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| 1-Close port A-AB |
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| 2-Adjust STAD-S for design flow |
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| 3-Open port A-AB fully |
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| 4-Adjust STAD-P for design primery flow |
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| Return to control
valve selection |
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