Design Technical Manual

Table Of Contents
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
Exhaust damper
Fresh air damper
Return air damper
Economizer
logic module
Room space
How to use economizer
Operation
mode
Environmental condition Intaking fresh
air
Air
conditioner
Economizer Remarks
Heating Cold climate
(~34°F [1°C])
Minimum* Heating Disable Heating by the air conditioner
Fresh air
intake cooling
Cool climate
(34~55°F [1~13°C])
Optimum Stop Enable Cooling by intaken fresh air
only
Combined Warm climate
(55~7F[13~24°C])
100% Cooling Enable Combined cooling by
intaken fresh air and the air
conditioner
VRF cooling Hot climate
(75°F~ [24°C~])
Minimum* Cooling Disable Cooling by the air conditioner
*Minimum fresh air requirements are specied in
ASHRAE Standard 62.1.
- (08 - 27) -
EXTERNAL INPUT
& OUTPUT
EXTERNAL INPUT
& OUTPUT