Auto View Of Run Status; Economizer Run Status - United Technologies Carrier Weathermaker 48A2 Controls, Start-Up, Operation, Service, And Troubleshooting

Cap Threshold Subtracting (Z.MIN) — This parameter is
used in the calculation of SMZ and is calculated as follows:
Z.MIN = Configuration
(–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 = Configuration
(–ADD.R))) * 0.6
High Temp Cap Override (H.TMP) — If stages of mechani-
cal cooling are on and the error is greater than twice Y.PLU,
and the rate of change of error is greater than 0.5 F, then a
stage of mechanical cooling will be added every 30 seconds.
This override is intended to react to situations where the load
rapidly increases.
Low Temp Cap Override (L.TMP) — If the error is less than
twice Y.MIN, and the rate of change of error is less than
–0.5F, then a mechanical stage will be removed every 30 sec-
onds. This override is intended to quickly react to situations
where the load is rapidly reduced.
Pull Down Cap Override (PULL) — If the error from set-
point is above 4F, and the rate of change is less than –1F per
minute, then pulldown is in effect, and "SUM" is set to 0. This
keeps mechanical cooling stages from being added when the
error is very large, but there is no load in the space. Pulldown
for units is expected to rarely occur, but is included for the rare
situation when it is needed. Most likely pulldown will occur
when mechanical cooling first becomes available shortly after
the control goes into an occupied mode (after a warm unoccu-
pied mode).
ITEM
VIEW

AUTO VIEW OF RUN STATUS

HVAC ascii string spelling out the hvac modes
OCC Occupied ?
MAT Mixed Air Temperature
EDT Evaporator Discharge Tmp
LAT Leaving Air Temperature
EC.C.P Economizer Control Point
ECN.P Economizer Act.Curr.Pos.
CL.C.P Cooling Control Point
C.CAP Current Running Capacity
HT.C.P Heating Control Point
HT.ST Requested Heat Stage
H.MAX Maximum Heat Stages
ITEM
ECON

ECONOMIZER RUN STATUS

ECN.P Economizer Act.Curr.Pos.
ECN.C Economizer Act.Cmd.Pos.
ACTV Economizer Active ?
DISA ECON DISABLING CONDITIONS
UNAV Econ Act. Unavailable?
R.EC.D Remote Econ. Disabled?
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 Desabled Econ?
O.AIR OUTSIDE AIR INFORMATION
OAT Outside Air Temperature
OA.RH Outside Air Rel. Humidity
OA.E Outside Air Enthalpy
OA.D.T OutsideAir Dewpoint Temp
 
COOL Z.GN * (–10 + (4*
 
COOL Z.GN * (10 + (4*
Table 91 — Auto View of Run Status Display Table
EXPANSION
Table 92 — Economizer Run Status Display Table
EXPANSION
Slow Change Cap Override (SLOW) — With a rooftop unit,
the design rise at 100% total unit capacity is generally around
30 F. For a unit with 4 stages, each stage represents about
7.5F of change to EDT. If stages could reliably be cycled at
very fast rates, the setpoint could be maintained very precisely.
Since it is not desirable to cycle compressors more than 6 cy-
cles per hour, slow change override takes care of keeping the
PID under control when "relatively" close to setpoint.
MODE TRIP HELPER — The Mode Trip Helper table pro-
vides information on the unit modes and when the modes start
and stop. See Table 94. This information can be used to help
determine why the unit is in the current mode.
CCN/LINKAGE DISPLAY TABLE — The CCN/Linkage
display table provides information on unit linkage. See
Table 95.
COMPRESSOR RUN HOURS DISPLAY TABLE — The
Compressor Run Hours Display Table displays the number of
run time hours for each compressor. See Table 96.
COMPRESSOR STARTS DISPLAY TABLE — The Com-
pressor Starts Display Table displays the number of starts for
each compressor. See Table 97.
TIME GUARD DISPLAY TABLE — The Time Guard Dis-
play Table delay time for each compressor and heat relay. See
Table 98.
SOFTWARE VERSION NUMBERS DISPLAY TABLE —
The Software Version Numbers Display Table displays the
software version numbers of the unit boards and devices. See
Table 99.
RANGE UNITS
string
YES/NO OCCUPIED
dF MAT
dF EDT
dF LAT
dF ECONCPNT
0-100 % ECONOPOS
dF COOLCPNT
CAPTOTAL
dF HEATCPNT
HT_STAGE
HTMAXSTG
RANGE UNITS
0-100 % ECONOPOS
0-100 % ECONOCMD
YES/NO ECACTIVE
YES/NO ECONUNAV
YES/NO ECONDISA
YES/NO DBC_STAT
YES/NO DEW_STAT
YES/NO DDBCSTAT
YES/NO OAECSTAT
YES/NO DEC_STAT
YES/NO EDT_STAT
YES/NO OAT_STAT
YES/NO ECONFORC
YES/NO SFONSTAT
YES/NO COOL_OFF
YES/NO OAQLOCKD
YES/NO ECONHELD
YES/NO DHDISABL
dF OAT
% OARH
OAE
dF OADEWTMP
93
POINT WRITE STATUS
forcible
POINT WRITE STATUS
forcible
forcible
forcible