![background image](http://html.mh-extra.com/html/carrier/weathermaster-48p2030-100/weathermaster-48p2030-100_controls-start-up-operation-service-and-troubleshooting_2560338052.webp)
52
Table 37 — Run Status Mode Trip Helper
The controlling temperature is “
TEMP
” and is in the middle of
the table for easy reference. The HVAC mode can also be
viewed at the bottom of the table.
For non-linkage applications and VAV control types (
C.TYP
= 1
or 2), “TEMP” is the controlling return air temperature
(
R.TMP
). For space sensor control, “TEMP” is the controlling
space temperature average occupied zone temperature (
S.TMP
).
For linkage applications, “TEMP” is zone temperature: average
occupied zone temperature (
AOZT)
during occupied periods and
average zone temperature (
AZT)
during unoccupied periods.
SUMZ COOLING ALGORITHM
The SumZ cooling algorithm is an adaptive PID (proportional,
integral, derivative) which is used by the control whenever more
than 2 stages of cooling are present (
C.TYP
= 1, 2, 3, and 4).
This section will describe its operation and define the pertinent
parameters. It is generally not necessary to modify parameters in
this section. The information is presented primarily for reference
and may be helpful for troubleshooting complex operational
problems.
The only configuration parameter for the SumZ algorithm is
located at the local display under
Configuration
COOL
Z.GN
.
See Table 35
Capacity Threshold Adjust (Z.GN)
This configuration affects the cycling rate of the cooling stages
by raising or lowering the threshold that capacity must build to
in order to add or subtract a stage of cooling.
The cooling algorithm’s run-time variables are located at the
local display under
Run Status
COOL
.
See Table 38.
Current Running Capacity (C.CAP)
This variable represents the amount of capacity currently run-
ning in 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 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”. The control will add a stage when
SMZ
reach-
es 100 and decrease a stage when
SMZ
equals –100.
Table 38 — Run Status Cool Display
ITEM
EXPANSION
UNITS
CCN
POINT
TRIP
MODE TRIP HELPER
UN.C.S
Unoccup. Cool Mode Start
dF
UCCLSTRT
UN.C.E
Unoccup. Cool Mode End
dF
UCCL_END
OC.C.S
Occupied Cool Mode Start
dF
OCCLSTRT
OC.C.E
Occupied Cool Mode End
dF
OCCL_END
TEMP
Ctl.Temp R.TMP,S.TMP or Zone dF
CTRLTEMP
OC.H.E
Occupied Heat Mode End
dF
OCHT_END
OC.H.S
Occupied Heat Mode Start
dF
OCHTSTRT
UN.H.E
Unoccup. Heat Mode End
dF
UCHT_END
UN.H.S
Unoccup. Heat Mode Start
dF
UCHTSTRT
HVAC
the current HVAC MODE
String
ITEM
EXPANSION
RANGE
UNITS
CCN POINT
WRITE STATUS
COOL
COOLING INFORMATION
C.CAP
Current Running Capacity
%
CAPTOTAL
CUR.S
Current Cool Stage
COOL_STG
REQ.S
Requested Cool Stage
CL_STAGE
MAX.S
Maximum Cool Stages
CLMAXSTG
DEM.L
Active Demand Limit
%
DEM_LIM
forcible
SUMZ
COOL CAP. STAGE CONTROL
SMZ
Capacity Load Factor
–100 to +100
SMZ
ADD.R
Next Stage EDT Decrease
^F
ADDRISE
SUB.R
Next Stage EDT Increase
^F
SUBRISE
R.PCT
Rise Per Percent Capacity
RISE_PCT
Y.MIN
Cap Deadband Subtracting
Y_MINUS
Y.PLU
Cap Deadband Adding
Y_PLUS
Z.MIN
Cap Threshold Subtracting
Z_MINUS
Z.PLU
Cap Threshold Adding
Z_PLUS
H.TMP
High Temp Cap Override
HI_TEMP
L.TMP
Low Temp Cap Override
LOW_TEMP
PULL
Pull Down Cap Override
PULLDOWN
SLOW
Slow Change Cap Override
SLO_CHNG
HMZR
HUMIDIMIZER
CAPC
Humidimizer Capacity
HMZRCAPC
C.EXV
Condenser EXV Position
COND_EXV
B.EXV
Bypass EXV Position
BYP_EXV
RHV
Humidimizer 3-Way Valve
HUM3WVAL
C.CPT
Cooling Control Point
COOLCPNT
EDT
Evaporator Discharge Tmp
EDT
H.CPT
Heating Control Point
HEATCPNT
LAT
Leaving Air Temperature
LAT
Summary of Contents for Weathermaster 48P2030-100
Page 130: ...130 Fig 19 Typical Power Schematic Sizes 040 075 Shown ...
Page 131: ...131 Fig 20 Main Base Board Input Output Connections ...
Page 132: ...132 Fig 21 RXB EXB CEM SCB Input Output Connections ...
Page 133: ...133 Fig 22 Typical Gas Heat Unit Control Wiring 48P030 100 Units Shown ...
Page 134: ...134 Fig 23 Typical Electric Heat Wiring 50P030 100 Units Shown ...
Page 135: ...135 Fig 24 Typical Power Wiring 115 V ...
Page 136: ...136 Fig 25 Typical Gas Heat Section Size 030 050 Units Shown ...
Page 138: ...138 Fig 27 Component Arrangement Size 030 035 Units ...
Page 139: ...139 Fig 28 Component Arrangement Size 040 075 Units ...
Page 140: ...140 Fig 29 Component Arrangement Size 090 100 Units ...