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Fan Fail Shuts Downs Unit (SFS.S)
When fan status monitoring is configured on, this configuration
will determine whether the unit should shut down on a supply fan
status fail or simply alert the condition and continue to run. If set
to YES, then the control will shut down the unit and send out an
alarm if supply fan status monitoring fails. If set to NO, the control
will not shut down the unit if supply fan status monitoring fails but
the control will send out an alert.
Fan Status Monitoring (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) monitor the
return-air temperature during unoccupied periods to determine if
there is a valid demand for heating or cooling before initiating an
unoccupied heating or cooling mode. If the routine runs but con-
cludes a valid demand condition does not exist, then the process is
not 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.
50 Hertz Unit? (50.HZ)
This configuration is not used. Do not change the setting of this
configuration.
MAT Calc Config (MAT.S)
This configuration gives the user three options in the processing of
the mixed-air temperature (MAT) calculation:
•
MAT.S
There will be no MAT calculation.
•
MAT.S
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 (evapora-
tor discharge temperature). Using this, the control has an
internal table whereby it can more closely determine the
true MAT value.
•
MAT.S
The control will stop learning and use whatever the control
has already learned. Using this setting infers that the con-
trol has spent some time set to MAT.S = 1.
First set MAT.S = 1, then go into the Service Test mode. Turn on
the fan and open the economizer to a static position for 5 minutes.
Move to several positions (20%, 40%, 60%, 80%). It is important
that the difference between return and outside temperature be
greater than 5 degrees. (The greater the delta, the better.) When
done, set MAT.S = 2.
Reset MAT Table Entries? (MAT.R)
This configuration allows the user to reset the internally stored
MAT learned configuration data back to the default values. The
defaults are set to a linear relationship between the economizer
damper position and OAT and RAT in the calculation of MAT.
MAT Outside Air Position Default (MAT.D)
This configuration is used to calculate MAT when the economizer
option is disabled. The configuration is adjustable from 0 to 100%
outside air. This defines the fixed ventilation position that will be
used to correctly calculate MAT.
Altitude.........In Feet: (ALTI)
As the control does not include a barometric pressure sensor to
define the calculation of enthalpy and cfm, the control does in-
clude an altitude parameter which will serve to set up a default
barometric pressure for use with calculations. The effect of baro-
metric pressure in these calculations is not great, but could have
an effect depending on the installed elevation of the unit. If the
=
0
=
1
=
2
rooftop is installed at a particularly high altitude and enthalpy or
cfm are being calculated, set this configuration to the current ele-
vation of the installed rooftop.
Start Up Delay Time (DLAY)
This option inhibits the unit from operating after a power reset.
The configuration may be adjusted from 0 to 900 seconds of delay.
Auxiliary Relay Output Configuration (AUX.R)
This configuration allows the user to configure the function of the
auxiliary relay output. The output is 1.4 vac, 5 va maximum. The
configuration can be set from 0 to 3. If AUX.R is set to 0, the aux-
iliary relay contact will be energized during an alarm. The output
can be used to turn on an indicator light or sound an alarm in a me-
chanical room. If AUX.R is set to 1, the auxiliary relay will ener-
gize when the controls determine that dehumidification/reheat is
needed. The relay would be wired to a third-party dehumidifica-
tion/reheat device and would energize the device when needed. If
AUX.R is set to 2, the auxiliary relay will energize when the unit is
in the occupied state. The relay could then be used to control light-
ing or other functions that need to be on during the occupied state.
If AUX.R is set to 3, the auxiliary relay will energize when the
supply fan is energized (and, if equipped with a VFD, the VFD
output is not 0%). The default is 0.
Disable T183 Alert (D.183)
This configuration allows the T183 alert to be disabled with
default value 0. If D.183 (T183DISA) is set to 1, the T183 alert
will not be sent or indicated on the local display when the out-
door ambient temperature (OAT) is below the compressor
lockout temperature setting (OATLCOMP), but mechanical
cooling locked out will be set as the mode in Operating modes.
SAV Optimized for Dehumidification (SV.DH)
When enabled (SAVDEHUM=YES) and the unit is configured
for SAV, the supply fan speed in LOW COOL or HIGH COOL
mode is based on compressor stage to maximize dehumidifica-
tion. If the compressor stage is below 60%, and there is suffi-
cient separation between the SST and SAT, the fan will operate
at low speed (SP.MN). If the compressor stage is at or above
60%, or there is not sufficient separation between the SST and
SAT, the supply fan will operate at high speed (SP.MX).
When disabled (SAVDEHUM=No) and the unit is configured
for SAV, the supply fan speed is based on the unit mode to
maximize sensible load control. If the unit is in LOW COOL
mode, the fan will operate at low speed (SP.MN). If the unit is
in HIGH COOL mode, the supply fan will operate at high
speed (SP.MX).
Space Temp Sensor (SPT.S)
If a space temperature sensor is installed (T55/T56), enable this
configuration.
Space Temp Offset Sensor (SP.O.S)
If a T56 sensor is installed with the space temperature offset slider,
enable this configuration.
Space Temp Offset Range (SP.O.R)
If a space temperature offset sensor is installed, it is possible to
configure the range of the slider by adjusting this range
configuration.
Space Air RH Sensor (SRH.S)
If a space relative humidity sensor is installed, enable this
configuration.
Return RH Sensor (RRH.S)
If a return air relative humidity sensor is installed, enable this
configuration.
Filter Status Switch Enabled? (FLT.S)
If a filter status switch is installed, enable this configuration to be-
gin the monitoring of the filter status input (Inputs
FLT.S). See the Dirty Filter Switch section on page 75 for more
details on installation and operation.
48
GEN.I
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Table of Contents
Troubleshooting
