Fujitsu Airstage J-II Series Design & Technical Manual page 847

 ECONOMIZER INPUT FUNCTION
Cooling economizer:
Consists of ducts, dampers, and automatic controlling system. In cold or warm climate, the
economizer reduces or stops the VRF compressor, providing cooling using outside air.
●Example of economizer
Return air damper
Room space
●How to use economizer
Operation Environmental condition Intaking fresh
mode
Heating Cold climate
(~34°F [1°C])
Fresh air Cool climate
intake cooling
(34~55°F [1~13°C])
Combined Warm climate
(55~75°F[13~24°C])
VRF cooling Hot climate
(75°F~ [24°C~])
*Minimum fresh air requirements are specified in ASHRAE Standard 62.1.
Economizer
logic module
Fresh air damper
Exhaust damper
Air
air conditioner
Minimum* Heating
Optimum Stop
100% Cooling
Minimum* Cooling
- (08 - 27) -
Economizer Remarks
Disable Heating by the air conditioner
Enable Cooling by intaken fresh air
only
Enable Combined cooling by
intaken fresh air and the air
conditioner
Disable Cooling by the air conditioner