CaptiveAire EMSplus User Manual

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EMSplus Specification

Demand Ventilation System

Application:

The EMSplus Demand Ventilation System is designed to automatically reduce exhaust and supply airflow
quantities, while ensuring hood performance is maintained. The EMSplus uses Variable Frequency
Drives (VFD) and temperature sensors in the exhaust ducts to modulate the fans speed during cooking
operation maximize energy savings. The EMSplus touch screen interface provides fan(s) control, system
configuration, programming of schedule and diagnostic information.

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Construction:

The EMSplus includes:

• Programmable Logic Controller (PLC)

• Touch Screen Interface, NEMA 4 rated

• Duct Temperature Sensors

• Variable Frequency Drives (VFD)

• Room Temperature Sensor

The system includes a touch screen interface for individual fan(s) and hood lights control, independent
wash control (if applicable), gas valve reset, programmable schedule, 100% Airflow Override function,
preparation time mode and diagnostics including VFD status. All touch screen pages displayed show
descriptive icons or plain text explaining the functions or values. The touch screen interface can be
installed on the face of the hood, on the face of the utility cabinet, on the face of a wall mounted control
enclosure or by itself, either recessed in the wall or surface mounted on the wall. The touch screen
interface is NEMA 4 rated in order to withhold grease and water when installed on the face of the hood or
utility cabinet.

Control enclosure will be NEMA 1 rated and listed for installation inside of the exhaust hood utility cabinet.
Control enclosure may be constructed of stainless steel or painted steel.

The programmable logic controller (PLC) will constantly monitor the exhaust air temperature through the
riser mounted temperature sensor and modulate the fan speeds accordingly.

A room temperature sensor will also be provided for field installation in the kitchen space in order to start
the fan(s) based on the temperature differential between the room and the exhaust air in the duct, rather
than fixed set-points.

A Preparation Time Mode is available for morning operation: dedicated make-up air will be locked out
only allowing the use of transfer air during this mode. Exhaust fan(s) will run at low CFM while
maintaining a balanced kitchen pressure.

Fan maximum/minimum speeds will be adjustable for proper kitchen balance. Fan direction change is
also available from the touch screen interface without need for rewiring.

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Duct Temperature Sensor(s) will be mounted in the exhaust hood riser(s). Temperature probes will be
constructed of Stainless Steel. System will be factory pre-set to modulate fan speed within a range of
45°F for 600°F and 700°F cooking applications and a range of 5°F for 400°F cooking applications. Set­points are fully adjustable through the touch screen interface based on application needs.

The 100% Airflow Override will have an adjustable timeout value.

The panels include color coded wiring with as-built wiring diagrams, and spare terminals controlled by the
fire system micro switch. The panel is factory pre-wired to shut down supply fans in a fire condition.
Options to turn on the exhaust fans or turn off the hood lights in a fire condition will be configurable
through the touch screen but only through a password protected menu to prevent any changes after a fire
inspection has been performed.