AAON MODGAS-XWR2-B, Техническое руководство

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6 MODGAS-XWR2-B Technical Guide
OVERVIEW
General Information
Overview
The MODGAS-XWR2-B Module (previously referred to as the
MODGAS-XWR-1) is designed to be used with White-Rogers
®
valves only. It will modulate up to two White-Rogers
®
gas valves to
maintain a desired Supply Air Temperature (up to four modulating
gas valves may be controlled when a second MODGAS-XWR2-B
is configured as a slave module). The MODGAS-XWR2-B also
controls the speed of the induction motors in combustion air blowers.
See
Figure 1, page 7
.
NOTE:
The MODGAS-XWR2 and MODGAS-XWR2-B can
be used interchangeably.
NOTE:
The MODGAS-XWR2-B does not support I
2
C
connections.
The MODGAS-XWR2-B can be used in Stand-Alone Mode or
connected to a VCCX2 Controller or VCB-X Controller using an
E-BUS cable.
The MODGAS-XWR2-B can have the following configurations:
• One modulating valve with one ignitor as one stage.
• Two modulating valves with one ignitor as one stage.
• Two modulating valves with two ignitors as one stage.
• Two modulating valves, with two ignitors as two stages.
Two MODGAS-XWR2-B Modules (Primary/Secondary) may be
configured to control four modulating valves as one stage - two
valves with one ignitor on each board. In addition, two modules may
be configured to control four modulating valves with two ignitors
on each board. The first valve on each board is stage one and the
second valve on each board is stage two.
The MODGAS-XWR2-B can also control additional fixed valves for
additional stages of heat by using the additional heat relays on the
board itself. When the MODGAS-XWR2-B is attached to one of the
listed AAON unit controllers, these additional stages are controlled
through the AAON unit controller. Additional fixed heat stages can
be increased by attaching a 12 Relay E-BUS Expansion Module.
Features
The MODGAS-XWR2-B provides the following:
• Can control two gas valves and monitors proof of ignition.
• A second MODGAS-XWR2-B can be added to allow
control of four modulating gas valves.
• Inputs for Stand-Alone Supply Air Temperature and Supply
Air Reset
• E-BUS communication to compatible unit controller for
Supply Air Temperature and Supply Air Reset
• Modulates gas valves to maintain the active Supply Air
Temperature Setpoint.
• Binary Outputs for Combustion Fan Enable, Combustion
Fan Low Speed, and Heat Stage Enable 1-4.
• Controls up to four stages of Heat with one module.
•
2 x 8 LCD character display and four buttons that allow for
status display, setpoint changes, and configuration changes.
NOTE:
The MODGAS-XWR2-B contains no user serviceable
parts. Contact qualified technical personnel if your
MODGAS-XWR2-B is not operating correctly.