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I/O Network Boards and Peripherals Hardware Overview • 2-7
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
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).
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 has 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). The
RTU relay outputs are rated for line voltage (240VAC).
The RTU board controls the rooftop unit directly with
its built-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 026-1705).
2.2.2.5 MultiFlex Rooftop Control Board
(RCB) (BX and CX Only)
The MultiFlex Rooftop Control Board (RCB)
(P/N 810-3062) is a rooftop HVAC control board for use
either as a stand-alone controller or in zone control appli-
cations using a Retail Solutions E2 BX building control
system. The MultiFlex RCB is capable of controlling heat
and cool stages, fans, humidification and dehumidification
devices, economizers using on-board I/O and control algo-
rithms, as well as monitor and interact with other building
control systems and peripherals (such as smoke alarms and
CO2 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 has its own installation and opera-
tion manual, (P/N 026-1707).
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.
LEGEND
1INPUT POWER
(24VAC)
9 RS485 TERMINATION
JUMPERS
2 RS485 I/O NETWORK 10 HAND-HELD TERMI-
NAL JACK
3 RCB INPUTS 1-8 11 RELAY OUTPUT CON-
NECTORS
4 RCB INPUTS 9-16 12 RELAY OUTPUT FUSES
(2A rated, 250V slow-
blow)
5NETWORK ID DIP
SWITCHES (S3, S4)
13 RELAY STATUS LEDs
6 INPUT TYPE DIP
SWITCHES (S1, S2)
14 OUTPUT FAIL-SAFE
SWITCHES
7 BOARD STATUS LEDs
(Code A, Code B, General
Status)
15 ANALOG OUTPUTS
8 DC POWER OUTPUTS
(3 at +5VDC, 1 at
+12VDC)
16 NETWORK STATUS
LEDs
Table 2-8 - MultiFlex RCB