Carrier AQUASNAP MPW015-045 Operation And Service Manual

Also see for AQUASNAP 30MPA: User manual Installation instructions Controls, start-up, operation, service, and troubleshooting

32DEMAND 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 CCNsystem designer. The ComfortLink™ controls will respond to aRedline command from the Loadshed control. When theRedline command is received, the current stage of capacity isset to the maximum stages available. Should the loadshed con-trol send a Loadshed command, the ComfortLink controls willreduce the current stages by the value entered for LoadshedDemand delta. The Maximum Loadshed Time is the maximumlength of time that a loadshed condition is allowed to exist. Thecontrol will disable the Redline/Loadshed command if noCancel command has been received within the configuredmaximum loadshed time limit.Cooling Set Point (4 to 20 mA) — A field suppliedand generated, externally powered 4 to 20 mA signal can beused to provide the leaving fluid temperature set point. Connectthe signal to LVT-10,8 (+,–). See Table 27 for instructions toenable the function. Figure 19 shows how the 4 to 20 mA sig-nal is linearly calculated on an overall 10 F to 80 F range forfluid types (ConfigurationOPT1FLUD) 1 or 2. The setpoint will be limited by the fluid (FLUD) type. Be sure that thechilled water loop is protected at the lowest temperature.50% CAPACITY AT 20 mA75% CAPACITY AT 12 mA100% CAPACITY AT 4 mA0 2 4 6 8 10 12 14 16 18 20DEMAND LIMIT SIGNAL – 4 - 20 mA INPUT100806040200MAX. ALLOWABLE LOAD (%)Fig. 18 — 4 to 20-mA Demand Limiting100(38)80(27)60(15)40(4.4)20(-7)0(-17)4 6.3 8.6 10.9 13.1 15.4 17.7 204 TO 20 mA SIGNAL TO EMMSET POINT, F (C)90(32)70(21)50(10)30(-1)10(-12)(FLUD = 2) MINIMUMSET POINT 14 F (-10 C)(FLUD = 1) MINIMUMSET POINT 38 F (3.3 C)MAXIMUMSET POINT70 F (21.1 C)Fig. 19 — Cooling Set Point (4 to 20 mA)EMM — Energy Management Module