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Other Boards in the MultiFlex Family Overview of the MultiFlex Product Line • 3
1.3. Other Boards in the Multi-
Flex Family
In addition to the I/O boards described
above, the MultiFlex hardware is used as the
base for a number of “smart” boards capable of
controlling refrigeration and HVAC systems or
subsystems independently from a central site
controller. These boards are considered “control-
lers” in their own right, and are therefore cov-
ered in separate manuals. For informational
purposes, these boards are described below.
1.3.1. The MultiFlex RTU
Similar in design to the MultiFlex combina-
tion input/output boards, the MultiFlex RTU
board is designed specifically for operating
package rooftop HVAC units as part of an Ein-
stein 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 Einstein
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 algorithms. It may operate in
stand-alone mode, or it may interface with an
Einstein BX or BCU to control the store envi-
ronment in zones and pass along logging and
alarm information.
The MultiFlex RTU has its own installation
and operation manual, P/N 026-1706 .
1.3.2. The MultiFlex RCB
The RCB is an improved version of the Mul-
tiFlex RTU. The RCB has sixteen fully configu-
rable 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, econo-
mizers or modulating heating and/or cooling-
valves, whereas the RTU has only two analog
outputs for use only with VS fans and economiz-
ers. 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 operation manual,
P/N 026-
1707.
1.3.3. The MultiFlex CUB-II and CUB-
TD
The MultiFlex Condensing Unit Board
(CUB) is a “smart” input/output board designed
to control single condensing units. The Multi-
Flex CUB-II controls all aspects of a condensing
unit, including compressor control, and con-
810-3066 MultiFlex 168 16 analog/digital in-
puts, 8 relay outputs.
810-3067 MultiFlex 168DO 16 analog/digital in-
puts, 8 relay outputs,
and 4 pulse-width
modulating digital
outputs
810-3073 MultiFlex
1616LAO 16 analog/digital in-
puts, 16 low-voltage
(24VAC rated) relay
outputs, and 4 analog
outputs.
810-3077 MultiFlex
1616LDO 16 analog/digital in-
puts, 16 low-voltage
(24VAC rated) relay
outputs, and 4 pulse-
width modulating
digital outputs.
810-3072 MultiFlex 1616L 16 analog/digital in-
puts, 16 low-voltage
(24VAC rated) relay
outputs.
Table 1-2 - MultiFlex Combination Input/Output Board Models