Emerson E2 User Manual

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 stand-alone capabilities.

The MultiFlex RTU uses its own occupied and unoccu-

pied heating and cooling setpoints when it operates in 
Stand-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 schedule that it may use to determine occupied 
or unoccupied building status. Different times may be pro-
grammed in the MultiFlex RTU application for Sunday 
through Saturday. Holiday scheduling is not supported.

Economization control is available if the sensor pro-

viding the economization checking is connected to an 
input on the MultiFlex RTU. Otherwise, economization is 
disabled.

As it does in Temperature Control, 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.

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.

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.

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 
compressor 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 

configuration 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).