Carrier WeatherExpert 48N2 Controls, Start-Up, Operation, Service, And Troubleshooting page 43

ITEM
UNIT UNIT CONFIGURATION
C.TYP Machine Control Type
SIZE Unit Size (75-150)
Fan Mode (0=Auto, 1=Cont)
FN.MD
Remote Switch Config
RM.CF
CEM CEM Module Installed
LQ.SN Liquid Sensors Installed
PW.MN Power Monitor Installed
VFD.B VFD Bypass Enable?
Enable Smart Menus?
SM.MN
Temp.Cmp.Strt.Cool Factr
TCS.C
TCS.H Temp.Cmp.Strt.Heat Factr
SFS.S Fan Fail Shuts Down Unit
SFS.M Fan Stat Monitoring Type
VAV.S VAV Unocc.Fan Retry Time
MAT Calc Config
MAT.S
Reset MAT Table Entries?
MAT.R
MAT.D MAT Outside Air Default
ALTI Altitude........in feet:
DLAY Startup Delay Time
AUX.R Auxiliary Relay Config
INPUT SENSOR CONFIG
SENS
Space Temp Sensor
SPT.S
SP.O.S Space Temp Offset Sensor
SP.O.R Space Temp Offset Range
SRH.S Space Air RH Sensor
RRH.S Return Air RH Sensor
Mixed Air RH Sensor
MRH.S
FACTORY CONFIGURATION
FACT
MD.MN Model Number
F. RST Perform Factory Restore?
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
Table 25 — Unit Configuration
EXPANSION RANGE UNITS
1 to 4
75 to 150
0 to 1
0 to 3
No/Yes
No/Yes
No/Yes
No/Yes
Disable/Enable
0 to 60 Minutes
0 to 60 Minutes
No/Yes
0 to 2
0 to 720 Minutes
0 to 2
No/Yes
0 to 100 %
–1000 to 60000
0 to 900 Seconds
0 to 3
Disable/Enable
Disable/Enable
1 to 10 dF
Disable/Enable
Disable/Enable
Disable/Enable
No/Yes
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.
43
CCN POINT DEFAULTS
CTRLTYPE 3
UNITSIZE 75
FAN_MODE 1
RMTINCFG 0
CEM_BRD No
LQ_SENS No
PWR_MON No
VFD_BYEN No
SMART_MN Enable
TCSTCOOL 0
TCSTHEAT 0
SFS_SHUT No
SFS_MON 0
SAMPMINS 50
MAT_SEL 1
MATRESET No
MATOADOS 20
ALTITUDE 0
DELAY 0
AUXRELAY 0
SPTSENS Disable
SPTOSENS Disable
SPTO_RNG 5
SPRHSENS Disable
RARHSENS Disable
MARHSENS Disable
No