2-6 • Site Supervisor Controller User Guide 2.0 026-1800 Rev 3 02-AUG-2016
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2.2.4 MultiFlex RTU
Similar in design to the MultiFlex combination input/
output boards, the MultiFlex RTU board is designed
specifically for operating package rooftop HVAC units as
part of an Site Supervisor 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 Site Supervisor 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). Both
auxiliary inputs can be configured for a variety of sensor
types including any type of linear sensor.
For linear sensors, 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 built-in heating, cooling, and humidity control
algorithms. It may operate in stand-alone mode, or it may
interface with an Site Supervisor or BCU to control the
store environment in zones and pass along logging and
alarm information.
The MultiFlex RTU has its own installation and
operation manual, (P/N 026-1705).
2.2.5 MultiFlex Rooftop Control
Board (RCB)
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
applications using a Retail Solutions Site Supervisor
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 algorithms, 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-P (pulse control board P/N 810-
3076) uses an alternate control strategy that incorporates
logic for controlling heating and cooling functions.
The MultiFlex RCB has its own installation and
operation manual, (P/N 026-1707).
2.2.6 The MultiFlex ESR Board
The MultiFlex ESR Valve Regulator board (P/N 810-
3199), shown in Figure 2-7, is an RS485 I/O Network
electronic stepper valve regulator capable of driving up to
LEGEND
1 INPUT POWER
(24VAC)
9 RS485 TERMINA-
TION JUMPERS
2 RS485 I/O NETWORK 10 HAND-HELD TERMI-
NAL JACK
3 RCB INPUTS 1-8 11 RELAY OUTPUT
CONNECTORS
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 OUT-
PUTS (3 at +5VDC, 1
at +12VDC)
16 NETWORK STATUS
LEDs
Table 2-5 - MultiFlex RCB
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