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COMPRESSOR 1 AND COMPRESSOR 2 TEST
The compressor test points are used to change output status for
the individual compressors. Compressor starts are not stag-
gered. The fan and heating service test outputs are reset to
“Disable” for the compressor service tests. The Indoor fan and
outdoor fans are controlled normally to maintain proper unit
operation. All normal cooling alarms and alerts are functional.
NOTE: For the LC WeatherExpert size 07-26 units, each com-
pressor stage can be operated independently.
HEAT 1 AND HEAT 2 TEST
The heat test points are used to change output status for the indi-
vidual heat stages, gas or electric. The fans and cooling service test
outputs are reset to “Disable” for the heat service tests. Indoor and
outdoor fans are controlled normally to maintain proper unit oper-
ation. All normal heating alarms and alerts are functional.
DEHUMIDIFICATION TEST
For units with the factory Reheat option, the dehumidification
relay is used to change the output status to operate the circuits
in different Reheat modes. Dehumidification relay on by itself
puts all circuits running in Hot Gas Reheat dehumidification
mode; dehumidification relay on and the cooling test (com-
pressor test relays) on puts unit and or individual circuits in
subcooling dehumidification mode. The fans and heating ser-
vice test outputs are reset to “Disable” for the dehumidification
service test. Indoor and outdoor fans are controlled normally to
maintain proper unit operation. All normal cooling/dehum
alarms and alerts are functional.
POWER EXHAUST TEST
This point allows the board's power exhaust (PE) output to be
manually turned On (Enable) and Off (Disable). Power Exhaust
test can operate simultaneously with other Service Test Points.
ECONOMIZER TEST
This point allows the board's economizer output to be manually
controlled from 0 to 100% Open. Economizer test can operate
simultaneously with other Service Test Points.
VFD SPEED TEST
This point activates the board's 0-10vdc analog output that con-
trols the unit's supply fan VFD speed or direct drive fan.
NOTE: This output is only applicable if Fan Control is set to Vari-
able Speed.
NOTE: Service Test Mode does not timeout. Be sure to turn off
test mode or cycle power to the RTU to return to normal operation.
Configuration
The RTU Open controller's configuration points effect the
unit's inputs and operation. Review and understand the mean-
ing and purpose of each configuration point before changing it
from the factory default value. Use the RTU Open controller
Start-up Sheet during configuration; fill in changed values if
changed from factory default. There are three main configura-
tions menus: SETPOINT, UNIT, and SERVICE.
Each configuration point is described below under its accord-
ing menu. See Appendix A for menu structure.
SETPOINT
Occupied Heating Setpoint – The heating setpoint the con-
troller maintains during the occupied period.
Range = 40 to 90°F
Default = 70°F
Occupied Cooling Setpoint – The cooling setpoint the con-
troller maintains during the occupied period.
Range = 55 to 99°F
Default = 76°F
Unoccupied Heating Setpoint – The heating setpoint the con-
troller maintains during the unoccupied period.
Range = 40 to 90°F
Default = 55°F
Unoccupied Cooling Setpoint – The cooling setpoint the con-
troller maintains during the unoccupied period.
Range = 45 to 99°F
Default = 90°F
Effective Heating Setpoint – The current setpoint value heat-
ing operation will control to:
Range = 0 to 120°F
Effective Cooling Setpoint – The current setpoint value cool-
ing operation will control to:
Range = 0 to 120°F
Optimal Start – The earliest time prior to occupancy, at which
the Optimal Start function may begin to adjust the effective set-
points. Setting this to 0 will disable optimal start.
Range = 0 to 4 hours
Default = 4 hour
Occ Relative Humidity Setpoint – The space RH setpoint the
controller maintains during the occupied period.
Range = 0 to the Unocc RH setpoint
Default 60%
Unocc Relative Humidity Setpoint – The space RH setpoint
the controller will maintain during the unoccupied period.
Range = 30 to 100%
Default = 95%
DCV Max Ctrl Setpoint – The difference between indoor and
outdoor CO
2
level which results in maximum ventilation
damper position.
Range = 0 to 9999ppm
Default = 650ppm
Power Exhaust Setpoint – Used to determine when the power
exhaust operation will begin. This setpoint is based on the maxi-
mum fan speed. When the economizer position opens above this
point, power exhaust operation will begin and when the damper
position falls 5% below this point, the power exhaust will shut-
down.
Range = 20 to 90%
Default = 50%
NOTE: This setpoint is automatically adjusted if the Fan Type is
set to Variable Speed or 2-Speed in order to maintain proper build-
ing pressure. The actual calculated value, Calculated PE Setpoint,
is shown in MAINTENANCE.
NOTE: This point is only used when Continuous Occupied
Exhaust = NO
UNIT
Fan Mode – Sets the operation of the indoor fan when not in
cooling or heating mode. Refer to fan operation for details on
each operation.
Range = Auto, Continuous, or Always On
Default = Continuous
Power Fail Restart Delay – Sets how long the controller delays
normal operation after the power is restored. Typically used to pre-
vent excessive demand when recovering from a power failure.
Range = 0 to 30 sec
Default = 5 sec
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