Carrier WeatherExpert 48N2 User Manual

112
Table 83 — Auto View of Run Status Display Table
Run Status
 VIEW  EDT — Displays the current evapora-
tor discharge air temperature during Cooling modes. This value
is read at the supply air thermistor location (or at cooling coil
thermistor array if unit is equipped with hydronic heating coil).
Run Status
 VIEW  LAT — Displays the current leaving-
air temperature during Vent and Hydronic Heating modes. This
value is read at the supply air thermistor location.
Run Status
 VIEW  EC.C.P — Displays the current econo-
mizer control point value (a target value for air temperature
leaving the evaporator coil location).
Run Status
 VIEW  EC1.P — Displays the current actual
economizer no. 1 (out) position (in percentage open).
Run Status
 VIEW  EC2.P — Displays the current posi-
tion of actuator no. 2 (ret.) (in percentage open).
Run Status
 VIEW  EC3.P — Displays the current posi-
tion of actuator no. 3 (out) (in percentage open).
Run Status
 VIEW  CL.C.P — Displays the current cool-
ing control point (a target value for air temperature leaving the
evaporator coil location).
Run Status
 VIEW  C.CAP — Displays the current
amount of unit cooling capacity (in percent of maximum).
Compare to staging tables in Appendix C.
Run Status
 VIEW  CL.ST — Displays the current number
of requested cooling stages. Compare to staging tables in
Appendix C and to C.CAP above.
Run Status
 VIEW  HT.C.P — Displays the current heat-
ing control point, for use with staged gas or modulating gas
control option only (a target value for air temperature leaving
the supply duct).
Run Status
 VIEW  HT.ST — Displays the current number
of heating stages active (for staged gas control option only).
Compare to following point.
Run Status
 VIEW  H.MAX — Displays the maximum
number of heat stages available for this model.
ECONOMIZER RUN STATUS — The Economizer Run Status
display table provides information about the economizer and can
be used to troubleshoot economizer problems. See Table 84. The
current position, commanded position, and whether the econo-
mizer is active can be displayed. All the disabling conditions
for the economizer and outside air information is also displayed.
COOLING INFORMATION — The Cooling Information run
status display table provides information on the cooling opera-
tion and the Humidi-MiZer
®
operation of the unit. See
Table 85.
Current Running Capacity (
C.CAP) — This variable repre-
sents the amount of capacity currently running 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 max-
imum 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 add-
ing or subtracting a cooling stage during run time. It is a nor-
malized representation of the relationship between “Sum” and
“Z”. See the SUMZ Cooling Algorithm section on page 52.
Next Stage EDT Decrease (
ADD.R) — This variable repre-
sents (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.
ADD.R = R.PCT * (C.CAP – capacity after adding a cool-
ing stage)
For example: If R.PCT = 0.2 and the control would be add-
ing 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 repre-
sents (if subtracting a stage of cooling) how much the tempera-
ture 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
cooling stage)
For Example: If R.PCT = 0.2 and the control would be
subtracting 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 cal-
culation that represents the amount of degrees 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 vari-
able 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
Cap Threshold Subtracting (
Z.MIN) — This parameter is
used in the calculation of SMZ and is calculated as follows:
Z.MIN = Configuration
 COOL  Z.GN * (–10 + (4*
(–SUB.R))) * 0.6
ITEM EXPANSION RANGE UNITS CCN POINT WRITE STATUS
VIEW AUTO VIEW OF RUN STATUS
HVAC ascii string spelling out the hvac modes string
OCC Occupied ? YES/NO OCCUPIED forcible
MAT Mixed Air Temperature dF MAT
EDT Evaporator Discharge Tmp dF EDT
LAT Leaving Air Temperature dF LAT
EC.C.P Economizer Control Point dF ECONCPNT
EC1.P Economizer Out Act.Curr.Pos. 0-100 % ECONOPOS
EC2.P Economzr2 Ret. Act.Curr.Pos. 0-100 % ECON2POS
EC3.P Economzr3 Out Act.Curr.Pos. 0-100 % ECON3POS
CL.C.P Cooling Control Point dF COOLCPNT
C.CAP Current Running Capacity CAPTOTAL
CL.ST Requested Cool Stage CL_STAGE
HT.C.P Heating Control Point dF HEATCPNT
HT.ST Requested Heat Stage HT_STAGE
H.MAX Maximum Heat Stages HTMAXSTG

Carrier WeatherExpert 48N2 Specifications

General

Brand	Carrier
Model	WeatherExpert 48N2
Category	Air Conditioner
Language	English