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ventilation systems
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User Manual
HRU-MinistAIR
6
.6.2 Passive Cooling
Passive Cooling can be used to cool a building with outdoor air when the room temperature is higher than
the outside temperature and higher than the temp setpoint.
For example, in the summer, during a cool night, the a heated up building may be cooled by outdoor air.
Passive cooling may also be referred to as ‚Free cooling’, as no conventional energy consumptions is needed,
or ‚Night ventilation’ as this type of ventilation mostly happens at night.
Cooling is possible when all of the following conditions are met:
• The outdoor temperature ≤ The extract temperature (room temperature) - 5˚C (Free ventilation outside
offset #118).
Cooling is not possible when one of the following conditions is met:
• The outdoor temperature ≥ The extract temperature (room temperature) - 5˚C (Free ventilation outside
offset #118) +0.5˚C.
Cooling is activated when all of the following conditions are met:
• Cooling is possible.
• The extract temperature (room temperature) ≥+20˚C (Free ventilation heating setpoint #117) + 4˚C
(Free ventilation offset cool setpoint #132).
Cooling is deactivated when one of the following conditions is met:
• Cooling is not possible.
• The extract temperature (room temperature) ≤ +20˚C (Free ventilation heating setpoint #117) + 4˚C
(Free ventilation offset cool setpoint #132) -0.5˚C.
When cooling is activated the by-pass is fully (100%) opened.
Then, based on the temperature reading, it closes smoothly if the temperature exceeds the preset level.
6
.7 Emergency stop
The emergency stop becomes active when all following conditions are true:
• The emergency stop is not blocked
• T
supply
< +5˚C (Emergency stop temperature #20).
NOTE:
The emergency stop can only be cleared by a power down. (power cut off).
