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117
COOLING INFORMATION
The Cooling Information run status display table provides in
-
formation on the cooling operation and the Humidi-MiZer
®
operation of the unit. See Table 85.
Current Running Capacity (C.CAP)
This variable represents the amount of capacity currently run
-
ning 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 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 rela
-
tionship between “Sum” and “Z.” See the SUMZ Cooling Al
-
gorithm section on page 51.
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 cool
-
ing stage)
For example: If
R.PCT
= 0.2 and the control would be sub
-
tracting 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 de
-
grees 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
Table 84 —
Economizer Run Status Display Table
ITEM
EXPANSION
RANGE
UNITS
CCN POINT
WRITE STATUS
ECON
ECONOMIZER RUN STATUS
EC1.P
Economzr1 Act.Curr.Pos.
0-100
%
ECON1POS
EC2.P
Economzr2 Act.Curr.Pos.
0-100
%
ECON2POS
EC3.P
Economzr3 Act.Curr.Pos.
0-100
%
ECON3POS
ECN.C
Economizer Act.Cmd.Pos.
0-100
%
ECONOCMD
forcible
ACTV
Economizer Active?
No/Yes
ECACTIVE
SACA
Single Act CFM Ctl Activ
No/Yes
SACFMCTL
forcible
DISA
ECON DISABLING CONDITIONS
UNV.1
Econ1 Act. Unavailable?
No/Yes
ECN1UNAV
UNV.2
Econ2 Act. Unavailable?
No/Yes
ECN2UNAV
UNV.2
Econ3 Act. Unavailable?
No/Yes
ECN3UNAV
ENTH
Enth. Switch Read High?
No/Yes
ENTH
DBC
DBC - OAT Lockout?
No/Yes
DBC_STAT
DEW
DEW - OA Dewpt.Lockout?
No/Yes
DEW_STAT
DDBC
DDBD- OAT > RAT Lockout?
No/Yes
DDBCSTAT
OAEC
OAEC- OA Enth Lockout?
No/Yes
OAECSTAT
DEC
DEC - Diff.Enth.Lockout?
No/Yes
DEC_STAT
EDT
EDT Sensor Bad?
No/Yes
EDT_STAT
OAT
OAT Sensor Bad?
No/Yes
OAT_STAT
FORC
Economizer Forced?
No/Yes
ECONFORC
SFON
Supply Fan Not On 30s?
No/Yes
SFONSTAT
CLOF
Cool Mode Not In Effect?
No/Yes
COOL_OFF
OAQL
OAQ Lockout in Effect?
No/Yes
OAQLOCKD
HELD
Econ Recovery Hold Off?
No/Yes
ECONHELD
DH.DS
Dehumid. Disabled Econ.?
No/Yes
DHDISABL
O.AIR
OUTSIDE AIR INFORMATION
OAT
Outside Air Temperature
–40-240
dF
OAT
forcible
OA.RH
Outside Air Rel. Humidity
0-100
%
OARH
forcible
OA.E
Outside Air Enthalpy
–20-10000
OAE
OA.D.T
Outside Air Dewpoint Temp
–40-240
dF
OADEWTMP
Summary of Contents for WeatherExpert 48N2
Page 135: ...135 Fig 18 48 50N Typical Power Schematic Nominal 075 Ton Unit Shown ...
Page 136: ...136 Fig 19 48 50N Typical Power Schematic Nominal Ton 90 150 Units Shown ...
Page 137: ...137 Fig 20 48 50N Main Base Board Input Output Connections ...
Page 138: ...138 Fig 21 48 50N RXB EXB CEM Input Output Connections a48 9307 ...
Page 139: ...139 Fig 22 48 50N EXV SCB Input Output Connections a48 9308 ...
Page 140: ...140 Fig 23 48N Typical Modulating Gas Heat Unit Control Wiring ...
Page 141: ...141 Fig 24 50N Typical Electric Heat Unit Control Wiring ...
Page 144: ...144 Fig 27 48N Typical Gas Heat Section Wiring Nominal Ton 120 to 150 Units ...
Page 145: ...145 Fig 28 48 50N Typical Power Component Control Wiring 460 v ...
Page 146: ...146 Fig 29 48 50N Component Control Wiring 575 v Nominal Ton 075 to 150 Units ...
Page 147: ...147 Fig 30 48 50N Component Arrangement Power Box ...
Page 148: ...148 Fig 31 48 50N Component Arrangement Control Box ...
Page 240: ...240 APPENDIX D VFD INFORMATION CONT Fig G VFD Bypass Wiring Diagram WHEN USED ...