Carrier WeatherExpert 48N2 Controls, Start-Up, Operation, Service, And Troubleshooting page 52

ITEM
COOL COOLING INFORMATION
C.CAP Current Running Capacity
CUR.S Current Cool Stage
REQ.S Requested Cool Stage
MAX.S
Maximum Cool Stages
DEM.L Active Demand Limit
SUMZ COOL CAP. STAGE CONTROL
SMZ Capacity Load Factor
ADD.R Next Stage EDT Decrease
SUB.R Next Stage EDT Increase
R.PCT
Rise Per Percent Capacity
Y.MIN Cap Deadband Subtracting
Y.PLU Cap Deadband Adding
Z.MIN Cap Threshold Subtracting
Z.PLU Cap Threshold Adding
H.TMP High Temp Cap Override
L.TMP
Low Temp Cap Override
PULL Pull Down Cap Override
SLOW Slow Change Cap Override
HMZR HUMIDIMIZER
CAPC Humidimizer Capacity
C.EXV Condenser EXV Position
B.EXV
Bypass EXV Position
RHV Humidimizer 3-Way Valve
C.CPT Cooling Control Point
EDT Evaporator Discharge Tmp
H.CPT Heating Control Point
LAT Leaving Air Temperature
EXVS
EXVS INFORMATION
A1.EX Circuit A EXV 1 Position
A2.EX Circuit A EXV 2 Position
B1.EX Circuit B EXV 1 Position
B2.EX Circuit B EXV 2 Position
SH.A1 Cir A EXV1 Superheat Tmp
SH.A2
Cir A EXV2 Superheat Tmp
SH.B1
Cir B EXV1 Superheat Tmp
SH.B2 Cir B EXV2 Superheat Tmp
CTRL EXVS CONTROL INFORMATION
C.SHS EXV Superheat Ctrl SP
C.FLS EXV SH Flooding Ctrl SP
C.EXP
EXV PID Ctrl Prop. Gain
C.EXT
EXV Ctrl Integrat. Time
C.EXM Cir Strt EXV Mn Ctrl Pos
Next Stage EDT Increase (SUB.R)
This variable represents (if subtracting a stage of cooling)
how much the temperature should rise in degrees depending
on the R.PCT calculation and exactly how much capacity is
to be subtracted.
SUB.R = R.PCT * (C.CAP — capacity after subtracting a
cooling stage)
For example: If R.PCT = 0.2 and the control would be sub-
tracting 30% capacity by taking the next step down, 0.2 times –
30 = –6°F (SUB.R)
Rise Per Percent Capacity (R.PCT)
This is a real time calculation that represents the number of de-
grees of drop/rise across the evaporator coil versus percent of
current running capacity.
R.PCT = (MAT – EDT)/ C.CAP
Cap Deadband Subtracting (Y.MIN)
This is a control variable used for Low Temp Override
(L.TMP) and Slow Change Override (SLOW).
Y.MIN = -SUB.R*0.4375
Table 32 — Run Status Cool Display
EXPANSION RANGE UNITS
0-100 % CAPTOTAL
0-20 COOL_STG
0-20 CL_STAGE
0-20 CLMAXSTG
0-100 % DEM_LIM
-400 – 400 SMZ
0-30 ADDRISE
0-30 SUBRISE
0-10 RISE_PCT
–40-0 Y_MINUS
0-40 Y_PLUS
–99-0 Z_MINUS
0-99 Z_PLUS
No/Yes HI_TEMP
No/Yes LOW_TEMP
No/Yes PULLDOWN
No/Yes SLO_CHNG
0-100 % HMZRCAPC
0-100 % COND_EXV
0-100 % BYP_EXV
No/Yes HUM3WVAL
–20-140 dF COOLCPNT
–40-240 dF EDT
–20-140 dF HEATCPNT
–40-240 dF LAT
0-100 % XV1APOSP
0-100 % XV2APOSP
0-100 % XV1BPOSP
0-100 % XV2BPOSP
–100-200 ^F SH_A1
–100-200 ^F SH_A2
–100-200 ^F SH_B1
–100-200 ^F SH_B2
5-40 ^F SH_SP_CT
0-10 FL_SP_CT
0-5 ^F EXV_PG_C
0.5-6 EXV_TI_C
0-100 % EXCSMP_C
Cap Deadband Adding (Y.PLU)
This is a control variable used for High Temp Override
(H.TMP) and Slow Change Override (SLOW).
Y.PLU = -ADD.R*0.4375
Cap Threshold Subtracting (Z.MIN)
This parameter is used in the calculation of SMZ and is calcu-
lated as follows:
Z.MIN = Configuration  COOL  Z.GN *
(–10 + (4* (–SUB.R))) * 0.6
Cap Threshold Adding (Z.PLU)
This parameter is used in the calculation of SMZ and is calcu-
lated as follows:
Z.PLU = Configuration  COOL  Z.GN *
(10 + (4* (–ADD.R))) * 0.6
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