AAON MODGAS-XWR2 User Manual

17
MODGAS-XWR2 Technical Guide
COMMUNICATIONS WIRING
Two Modulating Valves, Two Ignitors, Two Stages (2V2IGN2S)
This conguration is used to control two modulating gas valves
(one on each terminal connector), in which the first valve
is modulating stage 1 (Gas Valve 1) and the second valve is
modulating stage 2 (Gas Valve 2).The rst valve is attached to
Heat 1 (RLY3) and the second valve is attached to Heat 2 (RLY4).
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
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
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
Modulating
Gas Valve 2
Proof of Ignition
Signal 2 (24 VAC)
GV2
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 11: Communications Wiring - Two Modulating Valves, Two Ignitors, Two Stages
NOTE: Up to two additional xed heat stages can be
congured 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.

AAON MODGAS-XWR2 Specifications

General

Brand	AAON
Model	MODGAS-XWR2
Category	Controller
Language	English