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normally to maintain proper unit operation. All normal
cooling alarmsand alerts are functional.
NOTE: Circuit A is alwaysoperated with Circuit B due
to outdoor fan control on Circuit A. Always test Circuit A
first, and leave it on totest other Circuits.
The Heating submenu is used to change output status for
the individual heat stages, gas or electric. The fans and
cooling service test outputs are reset to OFF for the
heating service test. All normal heating alarms and alerts
are functional.
Configuration
The RTU--MP controller configuration points affect the
unit operation and/or control. Review and understand the
meaning and purpose of each configuration point before
changing it from the factory default value. The submenus
containing configuration points are as follows: Unit,
Cooling, Heating, Inputs, Economizer, IAQ, Clock--Set,
and User Password (USERPW). Each configuration point
is described below under its according submenu. See
Form 48--50H--T--2T, Appendix for display tables.
Unit
Start Delay
This refersto the time delay the unit will wait after power
up before it pursues any specific operation.
FactoryDefault = 5 sec
Range = 0--600sec
Filter ServiceHours
This refers to the timer set for the Dirty Filter Alarm.
After the number of runtime hours set on this point is
exceeded the corresponding alarm will be generated, and
must be manually cleared on the alarm reset screen after
the maintenance has been completed.The timer will then
begin counting itsruntime again for the next maintenance
interval.
FactoryDefault = 600 hr
NOTE: Settingthis configuration timer to 0, disables the
alarm.
Supply Fan Service Hours
This refers to the timer set for the Supply Fan Runtime
Alarm. Aftert he number of runtime hours set on this point
is exceeded the corresponding alarm will be generated,
and must be manually cleared on the alarm reset screen
after the maintenancehas been completed. The timer will
then begin counting its runtime again for the next
maintenance interval.
FactoryDefault = 0 hr
NOTE: Settingthis configuration timer to 0, disables the
alarm.
Compressor1Service Hours
This refersto the timer set for the Compressor 1 Runtime
Alarm. Aftert he number of runtime hours set on this point
is exceeded the corresponding alarm will be generated,
and must be manually cleared on the alarm reset screen
after the maintenancehas been completed. The timer will
then begin counting its runtime again for the next
maintenance interval.
FactoryDefault = 0 hr
NOTE: Settingthis configuration timer to 0, disables the
alarm.
Compressor2Service Hours
This refersto the timer set for the Compressor 2 Runtime
Alarm. After the number of hours set on this point is
exceeded the corresponding alarm will be generated, and
must be manually cleared on the alarm rest screen after
the maintenance has been completed.The timer will then
begin counting itsruntime again for the next maintenance
interval
FactoryDefault = 0 hr
NOTE: Settingthis configuration timer to 0, disables the
alarm.
Cooling
Number ofCompressor Stages
This refers to the number of mechanical cooling stages
available on a specific unit. Set this point to “One Stage”
if there isone compressor in the specific unit, set to “Two
Stage” if there are twocompressors in the unit, and set to
“None” if economizercooling ONLY is desired.
Factory Default = One Stage for 1 compressor units
TwoStage for 2 compressor units
Cooling/Econ SATLow Setpt
The supply air temperature must remain above this value
to allow cooling withthe economizer and/or compressors.
There is 5_F plus and minus deadband to this point. If the
SATfalls below this value duri ngcool ing, all compressors
will be staged off. The economizer will start to ramp
down to minimum position when the SAT = this
configuration +5_F.
FactoryDefault = 50_F
Range = 45--75_F
Cooling Lockout Temp
This defines the minimum outdoor air temperature t hat
cooling mode can be enabled and run. If the OAT falls
below this threshold during cooling, then compressor
cooling willnot be allowed.
FactoryDefault = 45_F
Range = 0--65_F
Heating
HeatingSAT High Setpt
The supply air temperature must remain below thi sva lue
to allowheating. There is 5_Fplus and minus deadband to
this point. If the SATri ses above this value during heating
the heat stages will begin to decrease until the SAThas
dropped below this value.
FactoryDefault = 120_F
Range = 95--150_F
HeatingLockout Temp
This defines the maximum outdoor air temperature t hat
heating mode can be enabled and run. If the OAT rises
above this threshold during heating, then heating will not
be allowed.
FactoryDefault = 65_F
Range = 49--95_F
48TC