The heat pump or cold unit is controlled using software located in the board.
The operation of the system is determined by the position of the microswitches in the main board.
The control algorithm also varies depending on the accessories that the board detects installed in the
unit.
4.1 General considerations
N O T E
[See the operating parameters in the section Rooms, see on page 25].
The start-up and stopping of any power device must not coincide with the start-up and stopping of other
devices of the same unit.
The time between the two is fixed at 1 sec. (MAQTION_OFF).
After a reset or power failure, it is obligatory to wait a specifically determined time the first time that the
electronic board activates a device. In this way, after a power failure, all the units of an installation are
prevented from starting up at the same time.
All the entries are filtered to prevent signal transit states from being detected.
The following sequence is observed in the start-up of a compressor:
1. 4-way valve (if it is necessary to activate it).
2. Outdoor fan.
3. Indoor fan.
4. Compressor.
The following sequence is observed in the stopping of a compressor:
1. Compressor.
2. Outdoor fan.
3. 4-way valve (if it is necessary to activate it).
4. Indoor fan.
When the heat signals of the thermostat are activated in a cold only unit (SW5ON), if the unit has auxiliary
heat stages, these are started.
4.2 Demand control unit
It is responsible for deciding which stages start up in order to compensate the demand.
The order in which the stages are activated depends on a list of operating stages order of priority. Priority
is established in the following manner:
• Compressors have more priority the fewer operating hours they have. A compressor can be inhibited
if it starts a defrost, has an alarm generated or its start-up is timed.
• If tandem compressor is selected, the compressor to start up as the first compressor is that which
has the least operating hours. If there are 2 circuits and 2 tandems with 2 demands, a compressor
starts up on each circuit.
N O T E
Tandem compressor: SW4ON (2 compressors per circuit)
• The economiser always has more priority than the compressors (to generate cold) and it operates as
long as the outside temperature is favourable (see information on accessories).
• In the hot water coil it is possible to select whether it has more or less priority than the compressors
with a jumper (see handling the accessories). It activates only to generate heat when the water
temperature is favourable.
Operation
4
General considerations 4.1
9
To Next Page
Loading...
Need help?
General
