Controls, Start-Up, Operation, Service and ... - Climayoreo

Table 82 — Auto View of Run Status Display Table
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
ECN.P Economizer Act.Curr.Pos. 0-100 % ECONOPOS
EC2.P Economzr2 Act.Curr.Pos. 0-100 % ECON2POS
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
Run StatusVIEWEDT — Displays the current evaporator
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 StatusVIEWLAT — Displays the current leavingair
temperature during Vent and Hydronic Heating modes. This
value is read at the supply air thermistor location.
Run StatusVIEWEC.C.P — Displays the current economizer
control point value (a target value for air temperature
leaving the evaporator coil location).
Run StatusVIEWECN.P — Displays the current actual
economizer position (in percentage open).
Run StatusVIEWEC2.P — Displays the current position
of actuator no. 2 (in percentage open).
Run StatusVIEWCL.C.P — Displays the current cooling
control point (a target value for air temperature leaving the
evaporator coil location).
Run StatusVIEWC.CAP — Displays the current
amount of unit cooling capacity (in percent of maximum).
Compare to staging tables in Appendix C.
Run StatusVIEWCL.ST — Displays the current number
of requested cooling stages. Compare to staging tables in
Appendix C and to C.CAP above.
Run StatusVIEWHT.C.P — Displays the current heating
control point, for use with staged gas control option only (a
target value for air temperature leaving the supply duct).
Run StatusVIEWHT.ST — Displays the current number
of heating stages active (for staged gas control option only).
Compare to following point.
Run StatusVIEWH.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 83. The
current position, commanded position, and whether the economizer
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 operation
and the Humidi-MiZer ® operation of the unit. See
Table 84.
Current Running Capacity (C.CAP) — This variable represents
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.
103
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 relationship between “Sum” and
“Z”. See the SUMZ Cooling Algorithm section on page 50.
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.
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
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 calculation
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 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
Cap Threshold Subtracting (Z.MIN) — This parameter is
used in the calculation of SMZ and is calculated as follows:
Z.MIN = ConfigurationCOOLZ.GN * (–10 + (4*
(–SUB.R))) * 0.6
Cap Threshold Adding (Z.PLU) — This parameter is used in
the calculation of SMZ and is calculated as follows:
Z.PLU = ConfigurationCOOLZ.GN * (10 + (4*
(–ADD.R))) * 0.6