YORK_HVAC European catalogue_Mar. 2021_EN | Page 43

Air-cooled VSD screw chiller with integrated Free-cooling

YVFA
Saving energy is simple in every situation
Condenser
Free Cooling Coil
Flash Tank
Open-loop Configuration
Automatic Liquid Control Valve
Compressor Free Cooling Coil
Closed Glycol Loop with Unit Mounted Pump
Evaporator
Condenser
Brazed Plate Heat Exchanger
Closed-loop Configuration Flash Tank
( optional )
1
Mechanical Cooling Mode
When it ’ s too warm to use ambient air for cooling , the YVFA performs as a standard chiller . The automatic flow-control valve in the open-loop configuration bypasses the free-cooling coils to reduce pump energy . When either cooling load or ambient temperature are less than full design condition , the variable-speed screw compressors and condenser fans modulate to optimize energy use . In a closed-loop configuration , the free-cooling coils are also bypassed .
Condenser
Free Cooling Coil
Flash Tank
Open-loop Configuration
Automatic Liquid Control Valve
CompressorFree Cooling Coil
Evaporator
Closed Glycol Loop with Unit Mounted Pump
Condenser
Brazed Plate Heat Exchanger
Closed-loop Configuration Flash Tank
( optional )
2
Hybrid Cooling Mode When ambient temperatures permit , liquid flow through the free-cooling coils is enabled . This pre-cooling reduces energy use while the compressors deliver final cooling to meet setpoint . Thanks to YORK VSD Screw technology , at reduced ambient the compressors may draw less power than the fan motors required to move air through the free-cooling coils . Advanced controls provide the most efficient operation rather than simply shutting off compressors as quickly as possible . The Annual Energy Cost Report demonstrates the benefit of this intelligent control .
Condenser
Condenser
Flash Tank
Free
Compressor Cooling Coil
Closed Glycol Loop with Unit Mounted Pump
Closed-loop Configuration Flash Tank ( optional )
3
Free Cooling Mode
At lower ambient temperatures , full cooling load can be most efficiently delivered by the free-cooling coils . Compressors are shut off and the VSD fans are modulated to meet the cooling setpoint .
Free Cooling Coil
Open-loop Configuration
Brazed Plate Heat Exchanger
Automatic Liquid Control Valve
Evaporator
Manufacturer reserves the rights to change specifications without prior notice .
YORK Air-Conditioning Products 43