94
VCCX2 Controller Technical Guide
RSMZ MODULE TREND LOGS
(TYPICAL OF 4 RSM MODULES)
Item Description
Log Abbreviation (Unit)
System Status
SYSState (Bit String)*
System Command
SYSCmd ((Bit String)*
A1 Compressor Modulating
Position
1Comp1Perc (%)
A1 Condenser Fan Position
1CondFan (%)
A1 Discharge Pressure
1DisPrs (PSI)
A1 Discharge Line
Temperature
1DisLnTmp (ºF)
A1 Suction Pressure
1SucPr (PSI)
A1 Suction Line Temperature
1SucLnTmp (ºF)
A1 Saturation Temperature
1SatTmp (ºF)
A1 Superheat
1Superheat (ºF)
A1 Expansion Valve Position
1EEV1Pos (%)
A1 Compressor Current
1CompCur (Amps)
A1 Compressor Status
1Comp1Stat
(Bit String)*
A1 Compressor VFD Status
1VFDStat (Bit String)*
A1 RSM Alarms
1RSMAlrms (Bit String)*
A1 VFD Alarms 1
1VFDAlrm1 (Bit String)*
A1 VFD Alarms 2
1VFDAlrm2 (Bit String)*
A1 Subcooling Temperature
1Subcool
1Subcool (ºF)
* Bit String and Enumerated Value information and interpretation is
explained in the paragraphs and tables at the end of this section.
Table 6: RSMZ Module Trend Logs
SEQUENCE OF OPERATIONS
RSMV/RSMD/RSMZ Trend Logs and Trend Log Enumerated Values
RSM Trend Logs
There can be as many as four RSMVs, four RSMDs, or six
RSMZs on a unit, with each RSM controlling up to two
compressors and condensers. These can be referred to as modules
1, 2, 3, and 4 or as modules A, B, C, and D. Various items
in the trend logs can refer to different modules and different
compressor/condensers on each module. For instance:
•
1A1: Stat refers to the status of Module 1/Compressor 1
•
4D1 would be Module 4/Compressor 1.
Likewise, 1SuctTmp1 refers to the suction (saturation)
temperature of Module 1/Compressor 1, while 3SucTmp2 refers
to the suction (saturation) temperature of Module 3/Compressor
2. Several trend log items will use this pattern to identify the
status of values related to certain modules and the compressors or
condensers on those modules. See
Table 7, this page
for RSMV
/ RSMD trend logs and
Table 6, this page
for RSMZ trend logs.
RSMV / RSMD MODULE TREND LOGS
(TYPICAL OF 4 RSM MODULES)
Item Description
Log Abbreviation (Unit)
Compressor A1 Status
1A1Stat (Bit String)*
Compressor A2 Status
1A2Stat (Bit String)*
Compressor A1 Modulating
Position
1Comp1 (%)
Compressor A2 Modulating
Position
1Comp2 (%)
Condenser A1 Modulating
Position
1Cond1 (%)
Condenser A2 Modulating
Position
1Cond2 (%)
A1 Expansion Valve
1EXV1 (%)
A2 Expansion Valve
1EXV2 (%)
Condenser A1 Expansion Valve
1EXV3 (%)
Condenser A2 Expansion Valve
1EXV4 (%)
A1 Head Pressure
1HeadPr1 (PSI)
A2 Head Pressure
1HeadPr2 (PSI)
A1 Suction Pressure
1SuctPr1 (PSI)
A2 Suction Pressure
1SuctPr2 (PSI)
A1 Saturation Temperature
1SuctTmp1 (ºF)
A2 Saturation Temperature
1SuctTmp2 (ºF)
A1 Suction Line Temperature
1CoilTmp1 (ºF)
A2 Suction Line Temperature
1CoilTmp2 (ºF)
A1 Condenser Suction Temp
1CoilTmp3 (ºF)
A2 Condenser Suction Temp
1CoilTmp4 (ºF)
A1 Superheat
1SprHeat1 (ºF)
A2 Superheat
1SprHeat2 (ºF)
Condenser A1 Superheat
1SprHeat3 (ºF)
Condenser A2 Superheat
1SprHeat4 (ºF)
Superheat Setpoint
1SprHtSP (ºF)
Saturation (Suction) Setpoint
1CoilSP (ºF)
Leaving Water Temperature
1LvgWater (ºF)
A1 Discharge Temperature
1DisChg1 (ºF)
A2 Discharge Temperature
1DisChg2 (ºF)
Relay 1 Status
1Relay1 (Bit String)*
* Bit String and Enumerated Value information and interpretation is
explained in the paragraphs and tables at the end of this section.
Table 7: RSMV/RSMD Module Trend Logs