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Installing a Universal Comm. Kit
Economizer (optional)
1. Function
1) Purpose
‐ Energy saving is possible by intaking 100% outdoor air during cooling operation when outdoor
temperature is low.
→ This is free cooling operation : Thermo off occurs even though room temperture is higher than set
temperature.
2) How to work
‐ It works by means of contact signal(input/output) between universal comm. kit PBA and economizer.
→ PBA has each contact signal : Input non voltage contact signal and output non valtage contact
signal
‐ Installation option setting is not required for this function, but in case of DOAS setting, this function is
not activated.
• When the contact for free cooling is shorted, free cooling is enabled. When the contact is open,
free cooling is not available.
NOTE
• After checking the input/output specifications of the economizer, connect a suitable relay.
2. Control Logic
Cooling ON
22
DB68-06643A-03_IM_ACC UCK Kit_AA_EN.indd 22
DB68-06643A-03_IM_ACC UCK Kit_AA_EN.indd 22
Yes
Is economizer
Thermo ON?
connected?
No
Thermo OFF
Thermo ON
Yes
Is free cooling
activated?
No
No
Thermo ON
Yes
Thermo OFF
(Free cooling start)
2023-01-13 오전 11:35:12
2023-01-13 오전 11:35:12
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