Compact Condens : A1003043 - 664Y7200 • A
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INSTALLER’S GUIDE
PRINCIPLES OF OPERATION
General
The Compact Condens is a room sealed boiler, equipped with a cast aluminium heat-exchanger. The boil-
er is provided with a heating circuit, but no internal Domestic Hot Water production tank. However, an
external DHW tank can be installed in the system. Refer to “System Configurations” on page 26
The CH circuit is not provided with a CH-pump. The installer must therefore install one in the system,
whose hydraulic resistance will match the hydraulic resistance of the boiler(s) and system. Please contact
your ACV representative for the correct accessories.
The Compact Condens boilers (both CH and DHW circuits) are controlled by the MAXSys processor.
Heating Circuit
The heating circuit can be controlled through:
•
On-off room thermostat (standard)
- As standard the boiler is programmed for using an on-off
room thermostat. The desired flow temperature is adjustable, but as standard is set to 80 °C. At CH
heat request from the room thermostat (and no DHW heat request present) the CH-pump is activat-
ed after 10 seconds. The controller will adjust the burner-input in such a way that a flow-tempera-
ture of 80 °C towards the CH-circuit is achieved.
•
0-10V signal (optional)
- The boiler can be programmed for using a 0-10 VDC signal (must be dis-
turbance-free). The maximum desired flow temperature is adjustable, but as standard set to 80 °C.
Please contact your ACV representative for more details and the correct accessories.
•
Outside Temperature Control OTC (optional)
- The boiler is prepared to work with an outdoor sen-
sor. The sensor should be installed on the north-side of the building at a height of approximately 2
meters. Once it is connected to the terminal strip of the boiler, the outdoor sensor is automatically
detected by the controller. Please contact your ACV representative for more details and the correct
accessories.
•
Digital communication (optional)
- The boiler is also prepared for digital communication with room
thermostats with communication protocols like Open-Therm (automatically recognised if correctly
connected to the terminal strip). Please contact your ACV representative for more details and the
correct accessories.
Domestic Hot Water preparation (DHW)
External storage tank with thermostat
- As standard the DHW configuration is set to use storage tank
+ tank thermostat.
For hydraulic connection of an external storage tank to the boiler one should either use a :
•
230 VAC DHW pump (Default configuration 2 Pump: DHW- and CH pump)
•
Electric 3-way valve.
DHW heat request for warm water is generated when the thermostat closes. The tank thermostat also
determinates the hysteresis (difference in ºC between on and off of the boiler) for keeping the storage
tank at temperature.
The standard storage tank set temperature is 80 ºC .
During operation the boiler will heat up until a flow temperature of 80 ºC is reached.
In case of a CH heat request, immediately after finishing the heat request for DHW, there is
a chance of hot water flowing into the CH system (hot shot).
External storage tank with NTC sensor
- In case the storage tank is equipped with an NTC sensor, adjust set-
ting in technician menu, advanced DHW settings, refer to “Boiler Setup Guide for the Installer” on page 11.
The resistance of the NTC sensor must have a value of 12 kOhm at 25 °C.
Heat request and keeping on temperature of the storage tank is done at an adjustable temperature (de-
fault set at 65°C).
In case of a CH heat request, immediately after finishing the heat request for DHW, there is
a chance of hot water flowing into the CH system (hot shot).
General behaviour with external storage tank
Disabling/Enabling warm water operation : press Summer-Winter button.
In some countries, at outputs ≥ 40 kW double separation between exchanging media is
required.
Safety features
The Compact Condens features various safety devices to protect the boiler and the complete system:
•
Main fuse
(5A), located near the On/Off switch, on the right side of the control panel
•
Syphon pressure switch
, connected to the sump (P1), prevents overflow of the syphon in case of
too high back pressure in the chimney
•
Overheat limit switch(thermostat),
set at 105°C.
•
Air pressure switch
, connected to the venturi, checks the amount of air (by means of a Δp meas-
urement) before start.
•
A
Frost protection mechanism
: This function protects the
boiler only
, not the system. As soon as
the flow temperature drops below 8°C, the central heating pump is activated. As soon as the flow
temperature is at 6°C, the burner starts up at minimum load until the flow temperature rises to 15°C.
The CH-pump will continue to run for 10 minutes. The function can be enabled or disabled through
the installer menu. When the frost protection is disabled, only the pump operate.
•
An
anti-freeze function
is also available using a frost thermostat connected in parallel with the
room thermostat. Another possibility is the use of an outdoor sensor in combination with OTC set-
tings (to be set by the installer).The CH pump will be activated if the outdoor temperature drops
below 8 ºC. In order to enable the Compact Condens boiler to protect the whole system against
freezing, all the valves of the radiators and the convectors should be completely open.
Other features
Eco working mode
- When the Eco button (
eco
) is pressed a programmable value is substracted from the
flow temperature set point.
Holiday mode
- When the Holiday button (
) is pressed a request is indicated to enter the start and
end date of the holiday period. The wished flow temperature and the DHW temperature for this period
can be set.
