Energy Management Systems

Greenheck offers a wide range of electrical controls to power the exhaust and supply fans used for your kitchen exhaust needs including a Kitchen Fan Control Center (KFCC) and four types of variable volume systems.

Kitchen Fan Control Center (KFCC)

Greenheck's Kitchen Fan Control Center, Model KFCC, is designed to control the exhaust fans, supply fans, and lights for the kitchen ventilation system. The KFCC is interlocked with the fire suppression system. It signals the make-up air unit to shut down upon activation of the fire suppression system. The panel will also activate the kitchen exhaust fan(s) if they are off. The panel has two sets of dry contacts that can be used to signal a shunt trip breaker (supplied by others) or an electric gas valve (supplied by others) for appliance and outlet shutdown. A spare set of contacts is provided for connection to the building fire alarm. Greenheck's KFCC is UL listed and available in single phase or three phase configurations. The enclosure is 18 gauge 304 stainless steel and available in various sizes with three mounting options.

Variable Volume

A variable volume system will allow the exhaust and supply units to ramp up and down depending on the cooking load, allowing the system to operate at peak efficiency. In some cases, a variable system can reduce the costs associated with conditioning make-up air by up to 50%. There are four types of variable volume systems ranging from a manual set-up to an advanced control system with multiple sensors.

Control System for 3-phase motors with variable speed - temperature sensors

• Temperature sensor in the duct collar as input device
• Exhaust and supply speeds vary with the temperature
• Fire system warning alarm tripped at a set temperature
• Fire system activated which also turns off supply fan
• 100% override to high speed
• Variable frequency drives (exhaust and supply)

The simple control system varies the frequency of the motor drives according to the temperature seen in the duct collar. Instead of high or low, this system will run at the optimum performance.

Control System - temperature and optic sensors

• Temperature sensor in the duct collar as input device
• Exhaust and supply speeds vary with the temperature
• Photoelectric sensor in capture area (for cooking surges)
• Variable Frequency Drives (VFD) ramp to high with smoke density increase
• Fire system warning alarm tripped at a set temperature
• Fire system activated which also turns off supply fan
• 100% override to high speed
• Variable frequency drives (exhaust and supply)

The advanced control system varies the frequency of the motor drives according to the temperature seen in the duct collar, and it uses a photoelectric sensor to detect smoke density. Once the photoelectric beam is broken caused by a surge in the cooking effluent, the system will ramp to 100% instantly for a set period of time. The system will return to the speed at which the temperature dictates when the smoke has been removed. This system can be overridden to 100% and can be linked to the fire system.

Advanced Variable Volume System

1. I/O Processor: Controls the lights, fans, and up to four hoods. It communicates to the electronic motor starters (VFDs) and can be manipulated using the keypad.
2. Electronic Motor Starter (VFD): Receives a start/stop command and a 4-20ma signal from the I/O processor. It varies the fan motor speed between a minimum and maximum setting.
3. Keypad: Provides daily operation functions and setup features.
4. Temperature Sensor: Located in the duct collar behind the filters, it monitors the duct temperature. A signal is then transmitted to the I/O processor in order to vary the fan speed in proportion to the actual heat load.
5. Optic Sensors: Monitor when actual cooking is taking place. After a 7% reduction is detected a signal is sent to the I/O processor to bring the fan motor to full speed until all the effluent is exhausted.

Variable Volume Payback Analysis

• CFM reduction: Typically ranges from 10% to 50% of design volume
• Hood operating hours: Typically ranges from 12-24 hours per day, or 4,380 - 8,760 hours per year
• Average energy costs: $2 per cfm/year can be used for estimating conditioning make-up air costs

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Catalog:

Variable Volume Ventilation System (581k)

Kitchen Fan Control Center (72k)