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3 - FEATURES
Electric heater configuration
32
126
Minimum flow rates depending on the unit model:
Model (P1)
39HXC 010 Alu
39HXC 010 PP
39HXC 020 Alu
39HXC 020 PP
39HXC 030 Alu
39HXC 040 Alu
39HXC 060 Alu
39HXE 010 Alu
39HXE 010 PP
39HXE 020 Alu
39HXE 020 PP
Fan delay
If the electric heater is running and a unit shutdown request appears, a settable post ventilation (P164) is used for cooling the electrical heaters.
164
3.10 - Free Cooling
Free cooling is used to cool the building when the outdoor temperature is lower than that inside the building. This operating mode is
used when the following conditions are met:
- Function activated in parameters P150 (only if control takes place on the return air or room temperature)
- Cooling requirement: the PID output must be greater than 0%
- The difference between the controlled temperature (measured return or room) and the fresh air must be sufficient: fresh air
temperature < controlled temperature – P206 (factory value 3°C)
- The fresh air temperature is above the "free cooling temperature low limit" (P207)
In free cooling mode, the supply air temperature is not monitored, and the heat recovery unit and coil are shut down. It is important to
configure a fresh air temperature low limit which is sufficiently high to ensure no discomfort is caused.
150
206
207
3.11 - Night cooling
The regulated temperature must be the return or room air value. The fans control must be based on flow rate. Night cooling is used
to cool the building using the colder night air.
In this case, when night cooling is active, the ventilation flow rate setpoint is the "night cooling" flow rate (P212 and P213).
Several conditions must be met to activate night cooling:
- The function must be activated by parameter P151
- The controller is located in a "night cooling" time slot or this is overridden via the CMS
- Cooling requirement: the controlled temperature must be greater than the night cooling temperature setpoint P210
- There must be sufficient difference between the controlled temperature and the fresh air: fresh air temperature < controlled
temperature – P206 (factory value 3°C)
- The fresh air temperature is above the "night cooling temperature low limit" (P207)
Periodic restarts: if one of the conditions for activation of night cooling is not verified (fresh air temperature, night cooling difference,
or cooling requirement), the unit shuts down.
The fans will be restarted at the night cooling flow rate for 5 minutes each hour, and night cooling will be reactivated if all the conditions
are verified. Otherwise, the AHU will stop again.
151
206
207
210
212
213
Electric heater
Minimum flow rate for electric heater operation
Electric heater min. flow rate
(P126)
500 m
/h
3
500 m
/h
3
1000 m
/h
3
1000 m
/h
3
1500 m
/h
3
2000 m
/h
3
3000 m
/h
3
500 m
/h
3
500 m
/h
3
1000 m
/h
3
1000 m
/h
3
Fan delay time
Free cooling control
Free cooling and night cooling operating differential compared to the controlled temperature
Temperature low limit for free cooling and night cooling
Night cooling control
Free cooling and night cooling operating differential compared to the controlled temperature
Temperature low limit for free cooling and night cooling
Control setpoint in night cooling mode
Air intake fan flow rate setpoint in night cooling mode
Air extraction fan flow rate setpoint in night cooling mode
Model (P1)
39HXE 030 Alu
39HXE 040 Alu
39HXE 050 Alu
39HXE 060 Alu
39HXE 075 Alu
39HXE 100 Alu
39HXE 150 Alu
39HXV 007 Alu
39HXV 007 PP
39HXV 015 Alu
39HXV 015 PP
39HXV 020 Alu
39HXV 020 PP
Electric heater min. flow rate
(P126)
1500 m
3
/h
2000 m
3
/h
2500 m
/h
3
3000 m
/h
3
3750 m
/h
3
5000 m
/h
3
7500 m
/h
3
350 m
/h
3
350 m
/h
3
750 m
3
/h
750 m
3
/h
1000 m
/h
3
1000 m
/h
3
23
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