8
RSMD2R Technical Guide
WIRING
RSMD2R Inputs Wiring
RSMD2R Wiring
The RSMD2R monitors and controls one refrigeration circuit of
the HVAC unit. The module is designed for R410-A refrigerant.
The RSMD2R is connected to the VCCX2 Controller. Up to
four RSMD2R’s can be connected, depending on the size of the
system. There are two E-BUS Expansion Ports which allow the
use of communicating sensors and the E-BUS Modules.
The RSMD2R provides three analog inputs, four binary inputs,
five relays, and two analog outputs. See
Figure 2, this page
for
inputs wiring and
Figure 3, page 9
for outputs wiring.
Suction Pressure Sensor Wiring
The Suction Pressure Transducers must be wired as shown
in
Figure 2, this page
. It is typically required for all VCCX2
applications.
The Suction Pressure Sensors are 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. The saturated refrigerant temperature is used to
properly control the compressors to maintain a given Suction
Coil (Saturated) Temperature Setpoint. In Cooling mode,
the VCCX2 resets the Suction Coil (Saturated) Temperature
Setpoint to maintain a given Supply Air Temperature Setpoint.
In Dehumidification Mode, the Suction Coil (Saturated)
Temperature Setpoint is a user configurable setpoint that can be
reset based on indoor humidity levels.
WARNING:
Observe Polarity! All boards must be wired
with GND-to-GND and 24-VAC-to-24
VAC. Failure to observe polarity will result
in damage to one or more of the boards.
Expansion modules must be wired in such
a way that the expansion modules and the
controller are always powered together. Loss
of power to the expansion module will cause
the controller to become inoperative until
power is restored to the expansion module.
Figure 2: RSMD2R Inputs Wiring
GND
18-30
VAC
Head Pressure 2 Sensor
(by others)
Comp. Discharge
Temp 1 Sensor
Comp. Discharge
Temp 2 Sensor
Leaving Water
Temp Sensor
Comp Status 1
Comp Status 2
Outside Coil Temp/POWF
Emergency Shutdown
TEMP 1
TEMP 2
TEMP 3
GND
GND
BIN4
BIN3
BIN2
BIN1
HP
+V
Suction Pressure 1
Sensor
GND
+V
SP
RD
WT
BL
Head Pressure 1 Sensor
(by others)
GND
HP
+V
RD
WT
BL
Suction Pressure 2
Sensor
GND
+V
SP
RD
WT
BL
RD
WT
BL
Line Voltage
Size transformer for
correct total load.
RSMD2R = 18 VA
GND
10A250
V
A
C
~
5
A
3
0
V
D
C
SA
VDE
G5Q
-1
A
4
O
M
R
O
N
DC12
V
C
H
IN
A
ALARM
UP
DOWN
ENTER
MENU
AAON P/N: ASM02869
+24
V
A
C
GND
RELAY CONTACT
RATING IS 1 AMP
MAX @ 24 VAC
CONDENSER 1
COMP 1
COMP 2
ANALOG OUT
REVERSING VALVE
COMMON
RELAY OUTPUT
TERMINALS
LABEL P/N:
G088060
COND 1
COND 2
GND
24 VAC
POWER ONLY
WARNING!
POLARITY
MUST BE
OBSERVED
OR THE
CONTROLLER
WILL BE
DAMAGED
CONDENSER 2
HEAD PRES 1
+5 V
+5 V
COMP DIS 1
COMP 1
SP-1
HP-1
COMP DIS 2
COMP 2
GND
GND
OA COIL / POWF
EMER SHDN
GND
LEAVING H20
GND
SUCTION PRES 2
HEAD PRES 2
+5 V
+5 V
SP-2
HP-2
GND
GND
R+
SHD
T-
E-BUS
R+ SHD T-
DUAL E-BUS
EXPANSION
RSMD2R
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SUCTION PRES 1
Summary of Contents for RSMD2R
Page 1: ...RSMD2R Technical Guide...
