Filter
Top Products
69
normally to maintain proper unit operation. All normal
cooling alarms and alerts are functional.
NOTE: Circuit A is always operated with Circuit B due
to outdoor fan control on Circuit A. Always test Circuit A
first, and leave it on to test 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 refers to the time delay the unit will wait after power
up before it pursues any specific operation.
Factory Default = 5 sec
Range = 0--600 sec
Filter Service Hours
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 its runtime again for the next maintenance
interval.
Factory Default = 600 hr
NOTE: Setting this configuration timer to 0, disables the
alarm.
Supply Fan Service Hours
This refers to the timer set for the Supply Fan Runtime
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 its runtime again for the next
maintenance interval.
Factory Default = 0 hr
NOTE: Setting this configuration timer to 0, disables the
alarm.
Compressor1 Service Hours
This refers to the timer set for the Compressor 1 Runtime
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 its runtime again for the next
maintenance interval.
Factory Default = 0 hr
NOTE: Setting this configuration timer to 0, disables the
alarm.
Compressor2 Service Hours
This refers to 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 its runtime again for the next maintenance
interval
Factory Default = 0 hr
NOTE: Setting this configuration timer to 0, disables the
alarm.
Cooling
Number of Compressor Stages
This refers to the number of mechanical cooling stages
available on a specific unit. Set this point to “One Stage”
if there is one compressor in the specific unit, set to “Two
Stage” if there are two compressors in the unit, and set to
“None” if economizer cooling ONLY is desired.
Factory Default = One Stage for 1 compressor units
Two Stage for 2 compressor units
Cooling/Econ SAT Low Setpt
The supply air temperature must remain above this value
to allow cooling with the economizer and/or compressors.
There is 5_F plus and minus deadband to this point. If the
SAT falls below this value during cooling, all compressors
will be staged off. The economizer will start to ramp
down to minimum position when the SAT = this
configuration +5_F.
Factory Default = 50_F
Range = 45--75_F
Cooling Lockout Temp
This defines the minimum outdoor air temperature that
cooling mode can be enabled and run. If the OAT falls
below this threshold during cooling, then compressor
cooling will not be allowed.
Factory Default = 45_F
Range = 0--65_F
Heating
Heating SAT High Setpt
The supply air temperature must remain below this value
to allow heating. There is 5_F plus and minus deadband to
this point. If the SAT rises above this value during heating
the heat stages will begin to decrease until the SAT has
dropped below this value.
Factory Default = 120_F
Range = 95--150_F
Heating Lockout Temp
This defines the maximum outdoor air temperature that
heating mode can be enabled and run. If the OAT rises
above this threshold during heating, then heating will not
be allowed.
Factory Default = 65_F
Range = 49--95_F
48TC