![background image](http://html.mh-extra.com/html/carrier/weatherexpert-48n2/weatherexpert-48n2_controls-start-up-operation-service-and-troubleshooting_2561505043.webp)
43
Table 25 —
Unit Configuration
Fan Fail Shuts Down Unit (SFS.S)
This configuration will allow whether the unit should shut
down on a supply fan status fail or simply alert the condition
and continue to run.
YES – Shut down the unit if supply fan status monitoring fails,
and send out an alarm.
NO – Do not shut down the unit if supply fan status monitoring
fails, but send out an alert.
Fan Status Monitoring Type (SFS.M)
This configuration selects the type of fan status monitoring to
be performed.
0 – NONE – No switch or monitoring
1 – SWITCH – Use of the fan status switch
2 – SP RISE – Monitoring of the supply duct pressure
VAV Unoccupied Fan Retry Time (VAV.S)
Machine control types 1 and 2 (VAV-RAT,VAV-SPT) include a
process for sampling the return-air temperature during unoccu
-
pied periods to prove a valid demand for heating or cooling be
-
fore initiating an unoccupied heating or cooling mode. If the
sampling routine runs but concludes a valid demand condition
does not exist, the sampling process will not be permitted for
the period of time defined by this configuration. Reducing this
value allows a more frequent re-sampling process. Setting this
value to zero will prevent any sampling sequence.
MAT Calc Config (MAT.S)
This configuration gives the user 3 options in the processing of
the mixed-air temperature (MAT) calculation:
•
MAT.S
= 0 CALC ONLY
The control will not attempt to learn MAT over time. The
control will simply calculate MAT based on the position of
the economizer, outside and return air temperature, linearly.
•
MAT.S
= 1 CALC N LEARN
The control will attempt to learn MAT over time. Any time
the system is in a vent mode and the economizer stays at a
particular position for long enough, MAT = EDT. Using
this, the control has an internal table whereby the user can
more closely zoom in on the true MAT value.
•
MAT.S
= 2 NO MAT CALC
The control will stop learning and use whatever the control
has already learned. This would infer that the control spent a
part of its life at
MAT.S
= 1. This might be useful to a com
-
missioner of a system who first sets
MAT.S
= 1, then might go
into the service test mode, turn on the fan and open the econo
-
mizer to a static position for a little more than 5 minutes and
then move to several positions to repeat the same
(20%,40%,60%,80%). The only stipulation to this “commis
-
sioning” is that it is important that the difference between re
-
turn and outside temperature be greater than 5 degrees. (The
greater the delta, the better.) When done, set
MAT.S
= 2 and
the system has been “learned” forever.
Reset MAT Table Entries? (MAT.R)
This configuration allows the user to reset the internally stored
MAT “learned” configuration entities back to their default val
-
ues. The defaults are set to a linear relationship between the
economizer damper position and OAT and RAT in the calcula
-
tion of MAT.
MAT Outside Air Default (MAT.D)
This is the default temperature used for the mixed air tempera
-
ture in the unit’s cooling algorithm.
ITEM
EXPANSION
RANGE
UNITS
CCN POINT
DEFAULTS
UNIT
UNIT CONFIGURATION
C.TYP
Machine Control Type
1 to 4
CTRLTYPE
3
SIZE
Unit Size (75-150)
75 to 150
UNITSIZE
75
FN.MD
Fan Mode (0=Auto, 1=Cont)
0 to 1
FAN_MODE
1
RM.CF
Remote Switch Config
0 to 3
RMTINCFG
0
CEM
CEM Module Installed
No/Yes
CEM_BRD
No
LQ.SN
Liquid Sensors Installed
No/Yes
LQ_SENS
No
PW.MN
Power Monitor Installed
No/Yes
PWR_MON
No
VFD.B
VFD Bypass Enable?
No/Yes
VFD_BYEN
No
SM.MN
Enable Smart Menus?
Disable/Enable
SMART_MN
Enable
TCS.C
Temp.Cmp.Strt.Cool Factr
0 to 60
Minutes
TCSTCOOL
0
TCS.H
Temp.Cmp.Strt.Heat Factr
0 to 60
Minutes
TCSTHEAT
0
SFS.S
Fan Fail Shuts Down Unit
No/Yes
SFS_SHUT
No
SFS.M
Fan Stat Monitoring Type
0 to 2
SFS_MON
0
VAV.S
VAV Unocc.Fan Retry Time
0 to 720
Minutes
SAMPMINS
50
MAT.S
MAT Calc Config
0 to 2
MAT_SEL
1
MAT.R
Reset MAT Table Entries?
No/Yes
MATRESET
No
MAT.D
MAT Outside Air Default
0 to 100
%
MATOADOS
20
ALTI
Altitude……..in feet:
–1000 to 60000
ALTITUDE
0
DLAY
Startup Delay Time
0 to 900
Seconds
DELAY
0
AUX.R
Auxiliary Relay Config
0 to 3
AUXRELAY
0
SENS
INPUT SENSOR CONFIG
SPT.S
Space Temp Sensor
Disable/Enable
SPTSENS
Disable
SP.O.S
Space Temp Offset Sensor
Disable/Enable
SPTOSENS
Disable
SP.O.R
Space Temp Offset Range
1 to 10
dF
SPTO_RNG
5
SRH.S
Space Air RH Sensor
Disable/Enable
SPRHSENS
Disable
RRH.S
Return Air RH Sensor
Disable/Enable
RARHSENS
Disable
MRH.S
Mixed Air RH Sensor
Disable/Enable
MARHSENS
Disable
FACT
FACTORY CONFIGURATION
MD.MN
Model Number
F. RST
Perform Factory Restore?
No/Yes
No
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 ...