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11-30 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013
11.7.13 Losing Contact With Zone
Applications
When a MultiFlex RTU or AHU loses contact with the
Zone application to which it was assigned, it is forced to
operate in Stand-Alone Mode. Each of the different appli-
cations have different s
tand-alone capabilities.
11.7.14 Stand-Alone MultiFlex RTUs
The MultiFlex RTU uses its own occupied and unoccu-
pied heating and cooling setpoints when it operates in
S
tand-Alone Mode. These values are programmed through
the MultiFlex RTU application and stored in the memory
on the MultiFlex RTU board itself. During Stand-Alone
Mode, the MultiFlex RTU uses its space temperature sen-
sor value as the control input.
The MultiFlex RTU also has a seven-day fallback
occupancy s
chedule that it may use to determine occupied
or unoccupied building status. Different times may be pro-
grammed in the MultiFlex RTU application for Sunday
throug
h Saturday. Holiday scheduling is not supported.
Economization control is available if the sensor pro-
viding the economization checking is connected to an
inp
ut on the MultiFlex RTU. Otherwise, economization is
disabled.
As it does in Temperature Co
ntrol, the MultiFlex RTU
stores its own occupied and unoccupied dehumidification
setpoints. If the MultiFlex RTU has its own humidity sen-
sor, it will continue dehumidification using the stored fall-
back setpoints.
11.7.15 MultiFlex RTU/ARTC and
AHU Zone Association
MultiFlex RTUs and AHUs are assigned to Zone appli-
cations using the Zone Association screen. To access this
screen:
1. Press
for the Main Menu.
2. Press
for System Configuration.
3. Press
the Network Setup menu.
4. Press
for Associations.
Figure 11-18
- Zone Association Screen (BX-400 Unit Shown)
The Zone Association screen lists all RTUs/ARTCs,
and AHUs that are set up on the current E2. To make an
association, move the cursor to the HVAC Zone field of
the RTU/ARTC or AHU you wish to associate, and press
(LOOK UP) to open the Application Selection menu
and use the arrow keys to scroll to find the desired Zone
name. When this menu is open, use and to
move quickly to the beginning or end of the list respec-
tively.
From this screen, you may also choose to jump to the
Setup screen to
configure an individual RTU/ARTC, AHU
or Zone application by using the (SETUP AHU) key
or the (SETUP ZONE) key.
11.8 MultiFlex CUB Board
The MultiFlex Condensing Unit Board (CUB) is a
“smart” input/output board designed to control single con-
densing units. A single condensing unit is a self-contained
com
pressor and condenser bearing unit which controls
refrigeration in a single case line-up or walk-in cooler.
The MultiFlex CUB uses the same general hardware
con
figuration as a MultiFlex 168AO. It is equipped with a
processor and extra memory to allow it to control com-
pressors, condensers, refrigeration
, and defrost for a single
condensing unit using on-board I/O and control algo-
rithms.
The MultiFlex CUB has its own installation and opera-
tion manual, (P/N 026
-1706).