CDA HCE340 for Manual de servicio descargar pdf (Pagina 16)

VEX340: Control system

EXact control system - Advanced functions

TEMPERATURE

Regulation principles Room temperature or supply air temperature regulation can be selected.

The control system regulates temperature using heat/cold recovery and controls external

cooling/heating coils or cooling unit if the cooling/heating demand is greater.

Regulating room

temperature

The room temperature is regulated using the unit's built-in temperature sensor in the extract

air spigot or an external room/duct sensor. Room temperature summertime compensation is

also available.

Supply air tempera-

ture regulation

Supply air temperature is regulated using the unit's built-in temperature sensor in the supply

air spigot. Regulating supply air temperature allows for outdoor air compensation.

Night-time cooling Comfort can be improved in large-mass buildings (weight) in the summer, by cooling the

buildings at night using outdoor air. Night-time cooling is particularly suitable for ofces, insti-

tutions, etc. where people do not work at night. Extra optimised function. Substantial energy

savings in regards to cooling unit.

Cooling recovery If there is a need to cool the room or supply air temperature, and the extract air temperature

is colder than the outdoor air, cold is recovered from the extract air and used to cool the sup-

ply air.

Combined with the night-cooling function, this means practically no energy is needed to cool

the supply air – as long as the extract air is colder than the supply air.

Regulating room tem-

perature – summer-

time compensation

When summertime compensation is selected, the set point for the desired room temperature

will increase in line with the outdoor temperature. This avoids an unpleasant cold shock when

there is a large difference between indoor and outdoor temperatures, and also saves energy.

Outdoor air

temperature

compensation with

supply air temperature

regulation

Outdoor air compensation is achieved using the unit’s built-in temperature sensor in the out-

door air spigot.

When compensating for outdoor air temperature, the supply air temperature set point is lowe-

red in summer and raised in winter.

This compensates the supply air temperature in relation to the outdoor air temperature.

AIRFLOW CONTROL

Outdoor airow

compensation

The control system has a built-in function that reduces the airow when outdoor air tempera-

ture falls. The temperature is measured in the outdoor air spigot.

Airow reduction The airow reduction function can be used when a heating coil is not tted, or where the

heating effect is not sufcient.

The supply air is reduced relative to supply air temperature, to maintain the supply air

temperature.

Airow control The unit maintains the set airow.

Airow compensation The airow is regulated, based on CO

, humidity or temperature measurement.

SAFETY

Frost protection when

using external water

heating coil

Frost protection of the water heating coil is achieved using a temperature sensor on the return

pipe. If the temperature falls under the set temperature during operation, the unit stops.

Heat retention func-

tion when using exter-

nal water heating coils

If the unit stops, a heat retention function is activated, which keeps the water in the return

pipe at the set temperature. This minimises the risk of frost in the heating coil and the unit is

ready to start immediately, even when the outdoor temperature is low.

Starting the unit On every start-up and before supply air begins, the system warms the heat exchanger with

extract air for 30 seconds.

Run on with external

electric heating coil

Electrical heating coils have built-in run on, so that the fans run on at low speed for three

minutes after the unit has been stopped. The heating coil is disconnected in that time.

Filter monitoring The unit has built-in lter monitoring. Limits are set via the control panel. The control panel

will indicate if a lter needs changing and this is registered in the alarm list.

Counter ow heat

exchanger frost

protection

Full description available on page 12

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