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2-6 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013
2.2.2.3 MultiFlex CUB
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
configu
ration 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
-1705).
2.2.2.4 MultiFlex RTU (BX and CX Only)
Similar in design to the MultiFlex combination input/
output boards, the MultiFlex RTU board is designed spe-
cifically for operating package rooftop
HVAC units as part
of an E2 BX or REFLECS BCU building control system.
The MultiFlex RTU is designed to be a replacement for the
previous generation ARTC, and is 100% compatible with
all legacy E2 BX and BCU systems.
The MultiFlex RTU board h
as 16 analog inputs, 8
relay outputs and 4 analog outputs. Most of these I/O
points are reserved for sensors and input devices required
to read environmental data (such as space and supply air
temperature) and control all output devices that control the
environment (such as heat/cool stages and dampers). Both
auxiliary inputs can be configured for a variety of sensor
types including any type of linear sensor. For linear sen-
sors, the auxiliary inputs can be configured as
Satellites.
By doing this, the minimum and maximum voltage and
minimum and maximum Engineering Unit parameters are
user configurable for these inputs. The RTU relay outputs
are rated for line voltage (240VAC).
The RTU board controls the rooftop unit directly with
its bui
lt-in heating, cooling, and humidity control algo-
rithms. It may operate in stand-alone mode, or it may
interface
with an E2 BX or BCU to control the store envi-
ronment in zones and pass along logging and alarm infor-
mation.
The MultiFlex RTU has its own installation and opera-
tion manual, (P/N 026
-1706).
2.2.2.5 MultiFlex Rooftop Control Board
(RCB) (BX and CX Only)
The MultiFlex Rooftop Control Board (RCB)
(P/N 81
0-3062) is a rooftop HVAC control board for use
either as a stand-alone controller or in zone control appli-
cations using a Emerson Retail Solutions E2 BX building
control s
ystem. The MultiFlex RCB is capable of con-
trolling heat and cool stages, fans, humidification and
deh
umidification devices, economizers using on-board I/O
and control algorithms, as well as monitor and interact
with other building control systems and peripherals (such
as smoke alarms and CO
2
sensors).
The RCB is an improved version
of the MultiFlex
RTU. The RCB has sixteen fully configurable analog and
digital input points, whereas the RTU has only eight
inputs, two of which are configurable. The RCB has four
analog outputs for use in controlling variable speed fans,
economizers or modulating heating and/or cooling valves,
whereas the RTU has only two analog outputs for use only
with VS fans and economizers. The RCB also features a
more sophisticated HHT interface and updated algorithms
for controlling heating, cooling, dehumidification, and air
quality.
The MultiFlex RCB-P (pulse control board P/N 81
0-
3076) uses an alternate control strategy that incorporates
logic for controlling heating and cooling functions.
The MultiFlex RCB has its own installation and opera-
tion manual, (P/N 026
-1707).
Figure 2-9
- MultiFlex RCB
1 Input Power (24VAC)
2 RS485 I/O Network
3 RCB Inputs 1-8
4 RCB Inputs 9-16
5 Network ID Dip Switches (S3, S4)
7 Board Status LEDs
(Code A, Code B, General Status)
12 Relay Output Fuses
(2A Rated, 250V Slow-blow
13 Relay Status LEDs
14 Output Fail-Safe Switches
15 Analog Outputs
8 DC Power Outputs
(3 at +5VDC, 1 at +12VDC)
9 RS485 Termination Jumpers
11 Relay Output Connector
10 Hand-Held Terminal Jack
16 Network Status LEDs
2.2.2.6 MultiFlex PAK Board
The PAK is a distributed pack (rack) controller that
controls compressors and condenser fans. The PAK can
control up to 8 compressor groups containing up to 16
compressors. The compressor control strategy is Fixed
Steps with setpoint/deadband using ON and OFF delays.
Up to 20 Fixed Steps can be configured.