Orion System VCC-X Controller - Manual (Page 39)

VCC-X Controller Technical Guide
REFRIGERANT SYSTEM MODULE WIRING
39
RSMV Inputs & Outputs Wiring
M
ENTER
UP
DOWN
ALARM
MENU
OE370-26-RSMV
REFRIGERANT
SYSTEM MODULE V AAON No.: V42440
E-BUS E-BUS
+24
V
AC
GND
RELAY CONTACT
RATING IS 1 AMP
MAX @ 24 VAC
CONDENSER
COMP 1
COMP 2
EXPANSION
VALVE 1
SUCTION
PRESSURE
SENSOR
HEAD
PRESSURE
SENSOR
COIL TEMP
SENSORS
BINARY
INPUTS
EXPANSION
VALVE 2
ANALOG
OUTPUTS
BLACK
+5 V
+5 V
COIL TEMP 1
COMP STATUS 1
BLACK
MOD COMP SIG
CONDENSER FAN SIG
WHITE
SP
HP
COIL TEMP 2
COMP 2 STATUS
GND
GND
TEMP 3
OUTSIDE COIL TEMP. SW
BIN 4
GND
GND
WHITE
RED
RED
GND
GREEN
GREEN
REVERSING VALVE
COMMON
RELAY OUTPUT
TERMINALS
www.aaon.com
WattMaster Overlay #000065 Rev 1A SW
REFRIGERANT SYSTEM MODULE
FOR VFD COMPRESSORS
(RSMV)
24VAC
GND
Line
Voltage
Size Transformer For
Correct Total Load.
RSMV = 18 VA
NOTE:
ALL RELAY OUTPUTS ARE NORMALLY
OPEN AND RATED FOR 24 VAC POWER
ONLY - 1 AMP MAXIMUM LOAD
CONDENSER ENABLE
COMPRESSOR 2 ENABLE
COMPRESSOR 1 ENABLE
24 VAC ONLY
R1
R3
R2
COMM
RD
WH
BK
GRN
RD
WH
BK
GRN
EXPANSION
VALVE 1
EXPANSION
VALVE 2
COM
+
MODULATING
COMPRESSOR
COM
+
CONDENSER
FAN SIGNAL
AOUT1
AOUT2
GND
Figure 24: RSMV Outputs Wiring
Suction Pressure Sensor Wiring
The OE275-01 Suction Pressure Transducer must be wired as shown
in Figure 23. It is typically required for all VCC-X applications.
The Suction Pressure Sensor is used to measure suction pressure
at the HVAC unit’s DX evaporator coil suction line. This suction
line pressure is converted to saturated refrigerant temperature by
the RSMV Controller. This temperature is used by the RSMV to
accurately control the Expansion Valves to maintain Superheat to
provide optimum performance of the system.
CAUTION: The Shraeder port used for installation of the
suction pressure transducer should be located in a vertical
position of the suction line to prevent refrigerant oil from
accumulating in the sensor.
Head Pressure Control
The RSMV can monitor a Head Pressure Transducer and control
Condenser Fans to maintain a Head Pressure Setpoint. The Condenser
Fan will be controlled with a 0-10 VDC output signal.
Coil Temperature Sensors
The Coil Temperature Sensors are used to measure Coil Temperature
after each evaporator coil line. This temperature combined with the
calculated saturated refrigerant temperature is used to calculate the
Superheat of each individual evaporator coil. The Superheat is used
to drive the Expansion Valves to maintain a given Superheat Setpoint.