thermital AF ACS 220 B, Operating And Installation Instructions

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ENGLISH
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How to use and set the electrical heater elements
To set the electrical heaters’ configuration, once AF ACS is ON and active, you have to keep pressed the black button
up to the lighting up of the blue LED. The blue LED indicates that an electrical heater is in operation.
AF ACS does not have any electrical heater element inside but it can drive and manage external electrical heater ele-
ment normally located inside the water tank you will use or the electrical water heater that you will use as a tank.
AF ACS can drive up to three electrical elements with max. 1,5 kW per element, in different mode of operations as
backup heater, booster… Following a description of the different mode of operations:
Electric back up management – Booster mode
By pressing operation button until the blue led is turned on and fixed, end users can activate the booster mode. In this
case the software will manage the electric heaters under certain conditions.
If after 120’ from the start up of the system (time counter does not start when the automatic mode is set but when the
heat pump is switched on), water set point is not reached, the first electrical element will be activated automatically.
The other steps, one by one, will be turned on every 120’ following water temperature trend, up to reach set point.
To exit the booster mode, it’s necessary to repeat the starting procedure.
Electric back up management – Super Booster mode
By pressing operation button until red led is turned on (3 beeps will be listened when the button will be released), end
user can activate the super booster mode. In this case all electric elements connected are switched on in one shot,
together with the heat pump. When water set point is reached, all heaters are switched off.
To exit Super Booster mode, it’s necessary to repeat the starting procedure.
This option is very useful when it’s necessary to heat the water as soon as possible.
Electric back up management – Automatic modes
AF ACS software can automatically manage electric back up heaters under certain conditions. This mean that these
operation modes are not to be set and that can not be deactivated.
They are:
- Antifreeze mode
- Cold draft prevention
- Electric water heater mode (in case heat pump is not active)
Electric back up management – Antifreeze mode
If water temperature inside the buffer tank is lower than 5° C, all electric elements connected are switched on. When
the water temperature reaches 10° C all the elements are turned off.
Electric back up management – Cold draft prevention
If water temperature is lower than 40º C and one or more indoor units is in cold draft condition and compressor is on
since 20’, one by one electrical element are switched on per time (every 20’) and switched off one by one when water
temperature reaches 45º C and no cold draft condition on any indoor unit is detected.
Electric back up management – Electric water heater
If the outdoor unit is stopped for maintenance of end user’s decision (no communication), AF ACS unit could be used
as controller of the electrical heater elements located inside the tank, exactly like any electric water heater. In this case,
if the water temperature is lower than the desired temperature for more than 10’, all the connected electrical heaters will
switch on up to the reaching of the setpoint. End users can switch off AF ACS if they do not want to have this option.