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APPENDIX A
SCN Tables
A_UNIT (General Unit Parameters)
CIRCADIO (Circuit A Discrete Inputs/Outputs)
CIRCA_AN (Circuit A Analog Parameters)
DESCRIPTION VALUE UNITS POINT NAME FORCEABLE
Control Mode 0 = Test
1 = Local Off
2 = SCN Off
3 = Clock Off
4 = Emergency Stop
5 = Local On
6 = SCN On
7 = Clock On
8 = Heat Enabled
9 = Pump Delay
STAT N
Occupied No/Yes OCC N
SCN Chiller Start/Stop CHIL_S_S Y
Low Sound Active No/Yes LSACTIVE N
Alarm State Normal/Alert/Alarm ALM N
Active Demand Limit 0 to 100 % DEM_LIM Y
Override Modes in Effect No/Yes MODE N
Percent Total Capacity 0 to 100 % CAP_T N
Requested Stage 0 to 99 STAGE N
Active Set Point –20 to 70
°
°°
°
FSP N
Control Point –20 to 70
°
°°
°
F CTRL_PNT Y
Entering Fluid Temp snnn.n
°
°°
°
FEWT N
Leaving Fluid Temp snnn.n
°
°°
°
FLWT N
Emergency Stop Enable/Emstop Enable EMSTOP Y
Minutes Left for Start 00:00 to 15:00 minutes MIN_LEFT N
PUMPS
Cooler Pump Relay 1 Off/On COOLPMP1 N
Cooler Pump Relay 2 Off/On COOLPMP2 N
Cooler Pump 1 Interlock Open/Close PMP1_FBK N
Cooler Pump 2 Interlock Open/Close PMP2_FBK N
Cooler Flow Switch Open/Close COOLFLOW N
Rotate Cooler Pumps Now No/Yes ROT_PUMP
Heat/Cool Select Heat/Cool HC_SEL N
DESCRIPTION VALUE UNITS POINT NAME FORCEABLE
CIRC. A DISCRETE OUTPUTS
Compressor A1 Relay On/Off K_A1_RLY N
Compressor A2 Relay On/Off K_A2_RLY N
Minimum Load Valve Relay On/Off MLV_RLY N
CIRC. A DISCRETE INPUTS
Compressor A1 Feedback On/Off K_A1_FBK N
Compressor A2 Feedback On/Off K_A2_FBK N
DESCRIPTION VALUE UNITS POINT NAME FORCEABLE
CIRCUIT A ANALOG VALUES
Percent Total Capacity 0-100 % CAPA_T N
Percent Available Cap. 0-100 % CAPA_A N
Discharge Pressure nnn.n PSIG DP_A N
Suction Pressure nnn.n PSIG SP_A N
Calculated HP Setpoint A nnn.n
°
°°
°
FHSP_AN
Saturated Condensing Tmp snnn.n
°
°°
°
FTMP_SCTAN
Saturated Suction Temp snnn.n
°
°°
°
F TMP_SSTA N
Compr Return Gas Temp snnn.n
°
°°
°
FTMP_RGTAN
Suction Superheat Temp snnn.n
∆
∆∆
∆
FSH_AN