System Mode Communication With External Contactor; Fan Speeds From An External System Contactor; Heat Exchanger Control; System Monitoring - Salda Smarty RV series Montage-Und Installationsanleitung

Inhaltsverzeichnis

7.4.15. SYSTEM MODE COMMUNICATION WITH EXTERNAL CONTACTOR

This function activates the preferred system switching on by means of external contactor; it indicates what signal will be sent to input. Possible

types of signals:

• Not used;

• Upon pressing a button the selected system mode is activated. After receipt of the first impulse the function is activated, and after second

impulse – deactivated;

• On/off; selected system mode is activated. The mode is active while the contactor is on;

• PIR sensor. When the sensor is activated, the selected system mode is activated. If the signal is not received for 30 minutes, the mode is

activated.

Function is set in the service environment section SERVICE › MAIN › SYSTEM MODE SWITCH.

7.4.16. FAN SPEEDS FROM AN EXTERNAL SYSTEM CONTACTOR

This function is designed to activate/deactivate the boost ventilation function or preferred combination of fan speeds by means of an external

contactor.

The function indicates a type of a signal to be sent to the input and components controlled by it. Possible combinations of signal types and func-

tions:

• Not used;

• On/off – selected fan speed combination is activated. Function is on when contactor is on;

• Button click – selected fan speed combination is activated. Function is activated when it receives an impulse. It is deactivated when it receives

the impulse again;

• On/off – Boost ventilation function is controlled. Function is on when contactor is on. If the boost ventilation function is not terminated by means

of this function within the boost ventilation time limit, force shutdown is used after the time expires;

• Button click – Boost ventilation function is controlled. Function is activated when it receives an impulse. It is deactivated when it receives the

impulse again;

• If the boost ventilation function is not terminated by means of this function within the boost ventilation time limit, force shutdown is used after

the time expires.

It is also indicated whether boost ventilation will be activated or combination of fan speeds is preferred, i.e. it is possible to indicate preferred supply

and extract air fan speeds individually.

7.4.17. HEAT EXCHANGER CONTROL

Cold - Heat Recuperation

Cold-heat recovery function is designed to control a heat exchanger. Its power is controlled by:

• Using plate heat exchanger - bypass damper. When it is closed, the heat exchanger is operating at full capacity. Its power is reduced by open-

ing the damper.

• Rotary heat exchanger power is controlled by changing its rotating speed or interval. When the rotor rotates at full speed, the heat exchanger

is used at full capacity. The power is reduced by slowing down the rotating speed or increasing the interval.

The heat exchanger can both heat and cool – it depends on air temperature. If it is colder outside than in the premises, the heat exchanger pre-

heats the outdoor air by using the room heat. If it is colder in the premises than outside, the heat exchanger cools down the outdoor air temperature

by room air. Its power is reduced to the minimum when the target supply air temperature is the same as outdoor one. The higher the difference

between the preferred and supply air temperatures, the higher heat exchanger power is used. When it is operating at maximum capacity, it is al-

lowed to activate other heating/cooling components.

For this function suitable heat exchanger type is indicated in the window SERVICE › HEAT EXCHANGER and PID controller coefficients – in the window ADJUSTER

› PID CONTROLLERS ADJUSTING.

PID controller output limits are set for rotor or bypass damper, at which their operation starts.

• If rotor is controlled by 0..10 V signal, at low voltages it does not rotate, the motor heats up, thus the minimum control signal output is limited. If

On/Off rotary heat exchanger is used, PID percentage for activating the rotor is indicated in the window SERVICE › HEAT EXCHANGER.

• If the bypass damper opens only a few percent, noise can occur, thus minimum opening is limited, which also applies when coming to the full

opening. If the plate heat exchanger with a 3-way bypass damper is used, the opening time of the bypass damper is indicated in the window

SERVICE › HEAT EXCHANGER.

• If a plate heat exchanger with segment valves is controlled by an external controller is used, then the type of the bypass damper "REMOTE CONTROL-

LER" is shown in the window "SERVICE › HEAT EXCHANGER".

• If a plate heat exchanger with segment valves connected to a controller is used, then the type of the bypass damper is shown in the window

"SERVICE › HEAT EXCHANGER" as either "2 SEGMENTS" or "3 SEGMENTS". In the case of heat recovery control, segments are closed in sequence, i.e. if heat

recovery is not required, then all the segments are closed and the bypass damper is opened.

When the fans are switched on during the heating season, the heat exchanger runs for 10 minutes at full power, until the system stabilizes.