Cap Threshold Subtracting (Z.MIN) -- This parameter is
used in the calculation of 334Z and is calculated as follows:
ZMIN = (bnfiguration_COOL--cZGN * (-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 = (bnfiguration--c(OOL--cZGN * (10 + (4*
(-ADD.R))) * 0.6
High Temp Cap Override (H. IMP) -- 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° E 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. IMP) -- If the error is less than
twice Y.MIN, and the rate of change of error is less than
-0.5 ° E 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° E 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).
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 set point 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 set point.
MODE TRIP HELPER -- The Mode Trip Helper table pro-
vides information on the unit modes and when the modes start
and stop. See Table 108. 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 109.
COMPRESSOR RUN HOURS DISPLAY TABLE -- The
Compressor Run Hours Display Table displays the number of
mn time hours for each compressor. See Table 110.
COMPRESSOR STARTS DISPLAY TABLE -- The Com-
pressor Starts Display Table displays the number of starts for
each compressor. See Table 111.
TIME GUARD DISPLAY TABLE -- The Time Guard Dis-
play Table delay time for each compressor and heat relay. See
Table 112.
SOFTWARE VERSION NUMBERS DISPLAY TABLE --
The Software Version Numbers Display Table displays the
software version numbers of the unit boards and devices. See
Table 113.
ITEM
VIEW
HVAC
OCC
MAT
EDT
LAT
EC.C.P
ECN.P
CL.C.P
C.CAP
HT.C.P
HT.ST
H.MAX
Table 105 -- Auto View of Run Status Display Table
EXPANSION
AUTO VIEW OF RUN STATUS
ascii string spelling out the hvac modes
Occupied ?
Mixed Air Temperature
Evaporator Discharge Tmp
Leaving Air Temperature
Economizer Control Point
Economizer Act,Curr, Pos,
Cooling Control Point
Current Running Capacity
Heating Control Point
Requested Heat Stage
Maximum Heat Stages
RANGE I UNITS I POINT
YES/NO
0-100
dF
dF
dF
Jr
dF
dF
string
OCCUPIED
MAT
EDT
LAT
ECONCPNT
ECONOPOS
COOLCPNT
CAPTOTAL
HEATCPNT
HT STAGE
HT_IAXSTG
WRITE STATUS
forcible
ECON
ECN.P
ECN. C
ACTV
DISA
UNAV
R.EC.D
DBC
DEW
DDBC
OAEC
DEC
EDT
OAT
FORC
SFON
CLOF
OAQL
HELD
O.AIR
OAT
OA.RH
OA.E
OA.D. T
ITEM
Table 106 -- Economizer Run Status Display Table
EXPANSION
ECONOMIZER RUN STATUS
Economizer Act,Curr, Pos,
Economizer Act,Cmd,Pos,
Economizer Active ?
ECON DISABLING CONDITIONS
Econ Act, Unavailable?
Remote Econ, Disabled?
DBC - OAT Lockout?
DEW - OA Dewpt, Lockout?
DDBD- OAT > RAT Lockout?
RANGE I UNITSI POINT
0-1 O0
0-1 O0
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
ECONOPOS
ECONOCMD
ECACTIVE
ECONUNAV
ECONDISA
DBC STAT
DEW- STAT
DDBCSTAT
WRITE STATUS
forcible
OAEC- OA Enth Lockout?
DEC - Diff, Enth,Lockout?
EDT Sensor Bad?
OAT Sensor Bad ?
Economizer Forced ?
Supply Fan Not On 30s ?
Cool Mode Not In Effect?
OAQ Lockout in Effect ?
Econ Recovery Hold Off?
OUTSIDE AIR INFORMATION
Outside Air Temperature
Outside Air Rel, Humidity
Outside Air Enthalpy
OutsideAir Dewpoint Temp
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
OAECSTAT
DEC_STAT
EDT STAT
OAT STAT
ECONFORC
SFONSTAT
COOL OFF
OAQLOCKD
ECONHELD
OAT
OARH
OAE
OADEWTMP
forcible
forcible
91
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