Emerson E2 operation manual MultiFlex CUB, MultiFlex RTU BX and CX Only, MultiFlex PAK Board

2.2.2.3MultiFlex 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 026-1705).

2.2.2.4MultiFlex 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). 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 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 026-1706).

2.2.2.5MultiFlex 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 Emerson Retail Solutions E2 BX building

control system. The MultiFlex RCB is capable of con- trolling 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 opera- tion manual, (P/N 026-1707).

1	Input Power (24VAC)	10	Hand-Held Terminal Jack
2	RS485 I/O Network	11	Relay Output Connector
3	RCB Inputs 1-8	12	Relay Output Fuses
4	RCB Inputs 9-16		(2A Rated, 250V Slow-blow
5	Network ID Dip Switches (S3, S4)	13	Relay Status LEDs
		14	Output Fail-Safe Switches
7	Board Status LEDs	15	Analog Outputs
	(Code A, Code B, General Status)	16	Network Status LEDs
8	DC Power Outputs
	(3 at +5VDC, 1 at +12VDC)
9	RS485 Termination Jumpers
Figure 2-9- MultiFlex RCB

2.2.2.6MultiFlex 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.

2-6 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013