DEMAND LIMIT (CCN Loadshed Controlled) — To con- figure Demand Limit for CCN Loadshed control set the De- mand Limit Select (Configuration→RSET→DMDC) to 3. Then configure the Loadshed Group Number (Configura- tion→RSET→SHNM), Loadshed Demand Delta (Configu- ration→RSET→SHDL), and Maximum Loadshed Time (Configuration→RSET→SHTM). See Table 27.
The Loadshed Group number is established by the CCN system designer. The ComfortLink controls will respond to a Redline command from the Loadshed control. When the Redline command is received, the current stage of capacity is set to the maximum stages available. Should the loadshed con- trol send a Loadshed command, the ComfortLink controls will reduce the current stages by the value entered for Loadshed Demand delta. The Maximum Loadshed Time is the maximum
length of time that a loadshed condition is allowed to exist. The control will disable the Redline/Loadshed command if no Cancel command has been received within the configured maximum loadshed time limit.
Cooling Set Point (4 to 20 mA) — A field supplied and generated, externally powered 4 to 20 mA signal can be used to provide the leaving fluid temperature set point. Connect the signal to LVT7,8
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| 50% CAPACITY AT 20 mA |
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LOAD | 80 |
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ALLOWABLE.MAX | 60 |
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40 | 100% CAPACITY AT 4 mA |
| 75% CAPACITY AT 12 mA |
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| 0 | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
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| DEMAND LIMIT SIGNAL – 4 - 20 mA INPUT |
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Fig. 21 — 4 to 20-mA Demand Limiting
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| (38) |
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| MAXIMUM |
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| SET POINT |
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| 70 F (21.1 C) |
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F (C) | (15) |
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SET |
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| SET POINT 38 F (3.3 C) |
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| 10 | (FLUD = 2) MINIMUM |
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| SET POINT 14 F |
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| 4 | 6.3 | 8.6 | 10.9 | 13.1 | 15.4 | 17.7 | 20 |
4 TO 20 mA SIGNAL TO EMM
EMM — Energy Management Module
Fig. 22 — Cooling Set Point (4 to 20 mA)
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