16
MODGAS-XWR2 Technical Guide
COMMUNICATIONS WIRING
Two Modulating Valves, Two Ignitors, One Stage (2V2IGN1S)
This conguration is used to control two modulating gas valves
(one on each terminal connector), in which the rst and second
valves operate together for one modulating stage. One valve is
connected to Heat 1 (RLY3) and the second valve is connected
to Heat 2 Relay.
For VCM-X Controllers, use an I
2
C cable connecting to the
appropriate I
2
C port on the controller.
For all other controllers, use an E-BUS cable connecting to an
E-BUS port on the controller.
Fan Enable
Low Speed Fan
Modulating
Gas Valve 1
(Modulates with
Valve 2 as 1 Stage
Proof of Ignition
Signal 1 (24 VAC)
Heat Valve 1
Check your Fan Relay Wiring (RLY1)
Schematic for proper wiring.
Heat Valve 2
Fixed Heat Stage 3
Fixed Heat Stage 4
ASSEMBLED IN USA
U15
D13
R
R
R
R
L1
R61
C28
SERIAL #
POWER
COMM
ALARM
STATUS
TB3
GND
AUX AIN
J3
GND
1
2
SAT
OPTIONS
RESET IN
D8
HEAT EN
D7
AUX BIN
GND
J1
U1
TB2
R1
YS102408 REV 3
TB1
RLY1
RLY2
RLY3
RLY4
RLY5
RLY6
COMMON
PO-IGN1
P3
D9
R33
R1
P1
PO-IGN2
P4
D10
R36
R2
Q2
R5
P2
C35
.01UF
R8
R22
R18
R16
R12
R13
R42
R44
D14
SOFTWARE
C22
C27
GAS VALVE 2
GAS VALVE 1
ALARM
UP
DOWN
ENTERMENU
MODGAS-XWR2
AAON P/N:ASM01695
LABEL P/N:
G041530
E-BUS
DUAL
I2C
CONNECT
+24 VAC
GND
@ 24 VAC
1 AMP MAX
CONTACT
RATING IS
COMMON
RELAY
OUTPUTS
GAS VALVE
TERMINALS
GAS
VALVE 1
GAS
VALVE 2
INPUT TERMINALS (TYPE)
HEAT ENABLE (BI)
AUX. (BI)
GND
RESET IN (AI)
SAT IN (AI)
GND (AI)
GND
AUX. (AI)
www.aaon.com
LOW SPEED
HEAT 1
HEAT 2
HEAT 3
HEAT 4
PROOF OF IGNITION 1
PROOF OF IGNITION 2
FAN
Notes:
1. 24 VAC must be connected so that all ground wires
remain common.
2. All wiring to be in accordance with local and national
electrical codes and specifications.
GV1
CR1
CR2
H1
Line
40 VA
transformer
minimum
GND
18-30
VAC
H2
Proof of Ignition
Signal 2 (24 VAC)
GV2
Modulating
Gas Valve 2
(Modulates with
Valve 1 as 1 Stage
See SAT OPTIONS Tables for Jumper Settings.
Only one Supply Air Temperature Sensor can be
used per application.
Supply Air
Temperature
Sensor
Mount in unit
supply air duct
Connect Supply Air Temperature Sensor
to AI2 (VCM-X and VCB-X) or AI3
(VCCX2) and GND on main controller
I
2
C cable connects to the VCM-X
E-BUS Controller's expansion
port
E-BUS cable connects to the
VCCX2 or VCB-X Controller's
expansion port
Figure 10: Communications Wiring - One Modulating Valve, Two Ignitors, One Stage
NOTE: Up to two additional xed heat stages can be
congured by using Heat 3 (RLY5) and Heat 4
(RLY6). If additional xed stages are required,
these should be configured and wired to the
AAON unit controller’s relays.
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