Trane CCE-Compact Series, Установка, эксплуатация и обслуживание

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air quality decreases, then the airflow rate, speed or duct pressure increases to an adjustable maxi-
mum value. This operating mode can only be used for airflow rate, speed or duct pressure control.
The air flow rate, speed or operating stage specified by the economy or comfort mode is always
kept and is increased by the air quality control.
Setpoint Description Default
CO2 Eco CO
2
setpoint for economy mode 1500 ppm
CO2 Comfort CO
2
setpoint for comfort mode 500 ppm
Control signal Requested fresh air amount or airflow rate 0 %
Supply max Maximum supply airflow rate for poor air
quality
Maximum supply fan speed for poor air
quality Nominal value
100%
Return max Maximum return airflow rate for poor air
quality
Maximum return fan speed for poor air
quality Nominal value
100%
Supply set Current supply airflow rate / fan speed
request … m³/h, … %
Return set Current return airflow rate / fan speed
request … m³/h, … %
Table 22: Air quality setpoints
14.5 Night setback
The operating mode Night setback is a special operating mode, which can be selected via the
scheduler, the display or the BMS.
In the night setback mode, the rooms shall be cooled with cool outdoor air to save cooling energy
the next day. The AHU is operated with the separately adjusted airflow rate, speed or duct pressure.
The recovery system, all heating and cooling batteries, humidification and dehumidification are inac-
tive.
Night setback starts according to the operating mode switch (e.g. scheduler at 0:00) when the out-
door temperature is above 12 °C, the room temperature is 3 °C above the setpoint (22 °C) and the
outdoor temperature is at least 5 °C below the room temperature. Night setback will run as long as
the outdoor temperature is above 12 °C, the room temperature is at least 1 °C above the setpoint
(22 °C) and the outdoor temperature is at least 1 °C below room temperature. A minimum operating
period of 30 min guarantees, that it will not immediately be switched off after starting.
Several settings are set during commissioning. The room temperature setpoint and the minimum
operating period, air flow rate, speed or operation stage can be set in the
Night setback menu.
If no room sensor and outdoor temperature sensor are present, then the return air temperature and
fresh air temperature are used. For this purpose, these are cyclically tested for 5 min every hour; if
the conditions are met, then the night setback mode continues operating.