Trane RRU150F N Series Installation, Operation And Maintenance Manual page 21

ROD. On call for heating the R/Air Damper remains
CLOSED and the O/Air Damper OPENS. The O/Air Damper
will OPEN on call for unoccupied heating, cooling or
dehumidification if the R/Air Damper is NOT INSTALLED.
"Unoccupied" Indoor Fan and Damper
Sequence
Space conditions control RRU "Unoccupied" operation
based on "Unoccupied" RRUCM set points. Set points
include Unoccupied Space Cooling Set Point (NCSP),
Unoccupied Space Humidity (NRSP) and Unoccupied
Space Heating Set Point (NHSP).
"Unoccupied" Heating Mode
"UNOCCUPIED" Contact OPEN at RRUTS –7 & 8
"Unoccupied" Cooling and
Dehumidification Mode With R/Air
Damper
RRUCM Energizes the Indoor Fan Motor (IDM) through
IDM Relay R2 R2 Energizes RTRM Terminal G and IDM
STARTS Fan Failure Switch (FFS) Proves Airflow
UNOCCUPIED COOLING or DEHUMIDIFICATION MODE
Established
RRU operates in UNOCCUPIED COOLING MODE until
NCSP is satisfied or UNOCCUPIED DEHUMIDIFCATION
MODE until the NRSP is satisfied. IDM R2 and ODR / RDR
R1 de-energize
Recirculating (100 Percent Return Air)
When enabled by the operator at the ROD, call for
UNOCCUPIED Cooling or Dehumidification is based on
the Space Temperature (ST) and Space Humidity (SRH)
measured at the Space Temperature Sensor (STC) and
Space Humidity Sensor (SHC). On call for UNOCCUPIED
Cooling or Dehumidification, the IFM is energized and
cooling or dehumidification with optional Hot Gas Reheat
is provided based on operator defined Night Setback
Cooling Set Point (NCSP) and Night Setback Relative
Humidity (NRSP) through the RRUCM.
Once the NCSP and NRSP are satisfied, the IFM is de-
energized.
NIGHT SETBACK COOLING SET POINT (NCSP):
NIGHT SETBACK HUMIDITY SET POINT (NRSP):
"Unoccupied" Cooling and
Dehumidification Mode Without R/Air
Damper
UNOCCUPIED COOLING or DEHUMIDIFICATION MODE
Disabled
RRU-SVX02F-EN
"Unoccupied" Heating Mode With or
Without R/Air Damper
RRUCM Energizes the O/Air Damper Actuator (ODA)
through ODR / RDR Relay R1
O/Air Damper OPENS
R/Air Damper (Optional) CLOSES through ODR / RDR
Relay R1
O/Air Damper makes the Outdoor Damper End Switch
(DES)
RRUCM Energizes the Indoor Fan Motor (IDM) through
IDM Relay R2
R2 Energizes RTRM Terminal G and IDM STARTS
Fan Failure Switch (FFS) Proves Airflow
UNOCCUPIED HEATING MODE Established
RRU operates in HEATING MODE until the NHSP is
satisfied. IDM R2 and ODR / RDR R1 de-energize
"Unoccupied" Cooling Or
Dehumidification Mode
"UNOCCUPIED" Contact OPEN at RRUTS –7 & 8
"Unoccupied" Heating Mode—
Recirculating (100 Percent Return Air)
When enabled by the operator at the RRUCM ROD, call for
UNOCCUPIED Heating is based on the Space Temperature
(ST) measured at the Space Temperature Sensor (STC).
On call for UNOCCUPIED Heating, the IFM is energized and
heating is provided based on operator defined Night
Setback Heating Set Point (NHSP) through the RRUCM.
Once the NHSP is satisfied, the IFM is de-energized.
NIGHT SETBACK HEATING SET POINT (NHSP):
Power On—"Emergency Stop"
Three Phase Unit Disconnect ON
EMERGENCY STOP is Initiated by OPENING Contact at
LVB – 4 & 5
ALL Modes and Indoor Fan Motor (IFM) STOP
75°F–90°F
80°F DEFAULT
60%–75% RH
65% RH DEFAULT
Sequence of Operation
50°F–60°F
50°F DEFAULT
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