Carrier WeatherExpert 48N2 Controls, Start-Up, Operation, Service, And Troubleshooting page 117

ITEM
ECON ECONOMIZER RUN STATUS
EC1.P Economzr1 Act.Curr.Pos.
EC2.P Economzr2 Act.Curr.Pos.
EC3.P Economzr3 Act.Curr.Pos.
ECN.C Economizer Act.Cmd.Pos.
ACTV
Economizer Active?
SACA Single Act CFM Ctl Activ
DISA ECON DISABLING CONDITIONS
UNV.1 Econ1 Act. Unavailable?
UNV.2 Econ2 Act. Unavailable?
UNV.2 Econ3 Act. Unavailable?
ENTH
Enth. Switch Read High?
DBC DBC - OAT Lockout?
DEW DEW - OA Dewpt.Lockout?
DDBC DDBD- OAT > RAT Lockout?
OAEC OAEC- OA Enth Lockout?
DEC DEC - Diff.Enth.Lockout?
EDT
EDT Sensor Bad?
OAT OAT Sensor Bad?
FORC Economizer Forced?
SFON Supply Fan Not On 30s?
CLOF Cool Mode Not In Effect?
OAQL OAQ Lockout in Effect?
HELD
Econ Recovery Hold Off?
DH.DS
Dehumid. Disabled Econ.?
O.AIR OUTSIDE AIR INFORMATION
OAT Outside Air Temperature
OA.RH Outside Air Rel. Humidity
OA.E Outside Air Enthalpy
OA.D.T
Outside Air Dewpoint Temp
COOLING INFORMATION
The Cooling Information run status display table provides in-
formation on the cooling operation and the Humidi-MiZer
operation of the unit. See Table 85.
Current Running Capacity (C.CAP)
This variable represents the amount of capacity currently run-
ning as a percent.
Current Cool Stage (CUR.S)
This variable represents the cool stage currently running.
Requested Cool Stage (REQ.S)
This variable represents the requested cool stage. Cooling relay
timeguards in place may prevent the requested cool stage from
matching the current cool stage.
Maximum Cool Stages (MAX.S)
This variable is the maximum number of cooling stages the
control is configured for and capable of controlling.
Active Demand Limit (DEM.L)
If demand limit is active, this variable will represent the
amount of capacity that the control is currently limited to.
Capacity Load Factor (SMZ)
This factor builds up or down over time (–100 to +100) and is
used as the means of adding or subtracting a cooling stage
during run time. It is a normalized representation of the rela-
tionship between "Sum" and "Z." See the SUMZ Cooling Al-
gorithm section on page 51.
Next Stage EDT Decrease (ADD.R)
This variable represents (if adding a stage of cooling) how much
the temperature should drop in degrees depending on the R.PCT
calculation and how much additional capacity is to be added.
Table 84 — Economizer Run Status Display Table
EXPANSION
®
RANGE UNITS
0-100 %
0-100 %
0-100 %
0-100 %
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
No/Yes
–40-240 dF
0-100 %
–20-10000
–40-240 dF
ADD.R = R.PCT * (C.CAP – capacity after adding a cooling
stage)
For example: If R.PCT = 0.2 and the control would be adding
20% cooling capacity by taking the next step up,
0.2 times 20 = 4°F ADD.R
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 how much capacity is to be subtracted.
SUB.R = R.PCT * (C.CAP – capacity after subtracting a cool-
ing 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 amount 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
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
117
CCN POINT WRITE STATUS
ECON1POS
ECON2POS
ECON3POS
ECONOCMD forcible
ECACTIVE
SACFMCTL forcible
ECN1UNAV
ECN2UNAV
ECN3UNAV
ENTH
DBC_STAT
DEW_STAT
DDBCSTAT
OAECSTAT
DEC_STAT
EDT_STAT
OAT_STAT
ECONFORC
SFONSTAT
COOL_OFF
OAQLOCKD
ECONHELD
DHDISABL
OAT forcible
OARH forcible
OAE
OADEWTMP