Orion System MODGAS-XWR - Manual (Page 3)

MODGAS-XWR Technical Guide
OVERVIEW
3
General Information
YS102530 REV 1
GAS
VAL
V
E
2
GAS
VAL
V
E
1
PO-IGN2
PO-IGN1
COMMON
RLY4
RLY3
RLY2
RLY1
WATTMASTER
CONTROLS
MADE IN USA
AUX BIN
HEAT EN
RESET IN
OPTIONS
SAT
GND
AUX AIN
GND
STATUS
ALARM
COMM
POWER
ANODE
AN
O D E
AN
O D E
M
ENTER
UP
DOWN
ALARM
MENU
OE377-26-00060
MODGAS-XWR
AAON No.: V20780
WattMaster No:
#SW000055
Rev.: 1A
E-BUS
CONNECT
I2C
CONNECT
+24
V
AC
GND
CONTACT RATING
IS 1 AMP MAX
@ 24 VAC
HEAT 1
LOW SPEED
FAN
PROOF OF IGNITION 1
PROOF OF IGNITION 2
GAS VALVE 2
GAS VALVE 1
GAS
V
AL
VE
TERMINALS
HEAT 2
COMMON
RELAY OUTPUT
TERMINALS
INPUT TERMINALS (TYPE)
HEAT ENABLE (BI)
AUX. (BI)
GND
RESET INPUT (AI)
SAT INPUT (AI)
GND(AI)
GND
AUX. (AI)
www.aaon.com
MODGAS-XWR CONTROLLER
(OE377-26-00060)
Figure 1: OE377-26-00060 MODGAS-XWR Controller
Features
The MODGAS-XWR Controller provides the following:
• Can control two (2) Gas Valves using input from
Proof of Ignition Modules
• Up to four (4) MODGAS-XWR Modules can be daisy-
chained together to control up to eight (8) Modulation Gas
Valves
• Monitors Supply Air Temperature and Supply Air Reset
and modulates gas valves to maintain Setpoint
• Provides active relays to control the Fan and
Heat Stages
• Contains a 2 x 8 LCD character display and 4 buttons
that allow for status display, setpoint changes, and
confi guration changes
NOTE: The
MODGAS-XWR Controller contains no user-
serviceable parts. Contact qualifi ed technical personnel
if your
MODGAS-XWR Controller is not operating
correctly.
Overview
The OE377-26-00060 MODGAS-XWR Controller (AAON Part No.
V20780) is designed to modulate up to two (2) gas valves to maintain
a desired Discharge Air Temperature. The MODGAS-XWR Control-
ler also controls the speed of the induced draft fan to maintain proper
combustion in the heat exchanger. See Figure 1.
The controller can be used as a stand-alone unit or be connected to
a VCM-X E-BUS Controller (OE332-23E-VCMX; AAON Part No.
V07150), VCB-X Controller (OE335-26B-VCBX; AAON Part No.
V28940), VCC-X Controller (OE338-26B-VCCX; AAON Part No.
V42430), or 12 Relay E-BUS Expansion Module (OE358-23E-12R;
AAON Part No. R69180) using a modular cable.
The MODGAS-XWR Controller can be confi gured at the factory for one
(1) modulating valve, two (2) staged modulating valves, or one (1) modu-
lating with multiple fi xed staged valves (stand-alone operation only).
When using the MODGAS-XWR Controller to replace an existing
MODGAS II Controller, see Appendix B, page 27 for details.