Soler & Palau UTBS PRO-REG ECOWATT Handleiding (96 Pagina's)

Handleiding

58

14. FREE COOLING BY NIGHT

By default, this feature is disabled. To enable it is necessary to access from Advance Settings.

This function is used during the summer to cool off buildings during the night by using fresh

outdoor air. This allows reducing the need to resort to air conditioning during the day.

To use the free cooling by night function, the information received from the outdoor probe

(fresh air) and from the discharge temperature probe is used. These two probes are pres-

ent and integrated in the unit at the level of the taps.

The free cooling is only active if the start-up conditions are satisﬁ ed:

Start-up conditions:

• Less than 4 days have elapsed since the last start of the installation.

• The outdoor temperature during the previous operation period exceeded the force limit

of 22°C

(1)

.

• It is between midnight 0:00 am

(1)

and 7:00 am

(1)

In the morning.

• The timer outputs for “normal speed”, “Extended running, Normal” and “External

switch” are Off.

• A time program will be activated (“Start”) within the next 24 h.

If ALL the conditions are satisﬁ ed, the free cooling starts running. It runs for 3 minutes to

make sure that the temperature measurements are representative (by creating a move-

ment of air in the ducts).

After three minutes, the controller checks the stop conditions:

Stop conditions:

• The outdoor temperature is above 18°C

(1)

or below 10°C

(1)

(risk of condensation).

• The discharge temperature is less than the stop value (18°C).

• The time programs (timer) for the normal speed, normal force run and the outdoor con-

trol are set to “Stop”.

• It is later than 7:00 am

(1)

in the morning.

If at least one of these conditions is satisﬁ ed after the ﬁ rst three minutes of operation, then

the unit is again stopped.

When the free cooling function is active, the fans run at maximum speed (it is possible to

reduce this speed by setting the parameters); the coil and heat exchanger control outputs

are switched off. The heating output remains inhibited for 60 min

(1)

after the function is

stopped.

(1) default values which can be changed by a parameter setting in ‘’expert mode’’.

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