Power On-"Emergency Stop - Trane RRU120 D B Series Installation, Operation And Maintenance Manual

Sequence of Operation
"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 UNOCCUPIED SPACE COOLING
SET POINT (NCSP):
NIGHT SETBACK UNOCCUPIED SPACE HUMIDITY
SET POINT (NRSP):
"Unoccupied" Cooling and
Dehumidification Mode Without R/Air
Damper
UNOCCUPIED COOLING or DEHUMIDIFICATION MODE
Disabled
"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.
NIGHT SETBACK HEATING SET POINT (NHSP):
22
"Unoccupied" Cooling Or
Dehumidification Mode
"UNOCCUPIED" Contact OPEN at RRUTS – 7 & 8
"Unoccupied" Heating Mode—
Non-recirculating (100 Percent Outdoor
Air)
Call for UNOCCUPIED Heating is based on the Space
Temperature (ST) measured at the Space Temperature
Sensor (STC). On call for UNOCCUPIED Heating, the
"OCCUPIED" VENTILATION MODE STARTING
SEQUENCE is initiated. Heating is provided based on the
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
85°F DEFAULT
60%–75% RH
65% RH DEFAULT
50°F–60°F
50°F DEFAULT
50°F–60°F
55°F DEFAULT
RRU-SVX01F-EN