46
Selected range
Re-ignition temperature
Standard range
< 40°C (P27)
Reduced range
< 20°C
Table 17 - Boiler re-ignition temperatures
3.2.11.
Selecting the operating range in heating mode
Heating water temperature adjustment range depends on the selected operating range:
- standard range: 20°C to 78°C (press h/- keys on the display);
- reduced range: 20°C to 45°C (press h/- keys on the display).
The standard range is active with curves P10
≥1, while the reduced range is active with P10 <1.
The two ranges can also be selected even with the external probe disconnected.
The waiting time between one boiler ignition and the following one, used to prevent boiler frequent turning on and off is 4 minutes for both
ranges, and can be edited with the parameter P11.
If system water temperature decreases below a certain value, the waiting time is reset and the boiler re-ignited, as shown in the following table:
Operation range selection is to be implemented by an installer or a Service Centre.
3.2.12.
Connection to ambient thermostat (optional)
The boiler is designed to be connected to an ambient thermostat (optional, not compulsory).
Ambient thermostat contacts must be properly sized in compliance with a load of 5 mA at 24 Vdc.
Ambient thermostat cables shall be connected to electronic board terminals 1 and 2 (fig. 21, 24), after having eliminated the jumper supplied as a
standard with the boiler.
The ambient thermostat cables are not to be grouped together in the same sheath as power mains supply cables.
3.2.13.
Installation and operation with open Therm Remote Control (optional)
The boiler may be connected to an Open Therm Remote Control (non-compulsory optional accessory supplied by manufacturer).
The Remote Control must only be installed by qualified personnel.
only use original Remote Control units supplied by the manufacturer.
The correct operation of the Remote Control itself and of the boiler is not guaranteed if non original Remote Control units not
supplied by the manufacturer are used.
To install the Remote Control, refer to the instructions provided with the Remote Control itself.
Please note the following precautions when installing the Remote Control:
- the Remote Control wiring must not be grouped together in the same sheath as the power cables: if the cables are sheathed together,
electrical interference from the power cables may compromise the functions of the Remote Control;
- the Remote Control must be installed on an indoor wall at a height of approximately 1.5 m from the floor and in a suitable location for measuring
ambient temperature: do not install in recess or corners, behind doors or curtains, and install away from heat sources, direct sunlight, air draughts
and water sprays.
3.2.10.
Connection to electrical mains
The boiler is supplied with a three-poled power cable, already connected to the electronic board and it is provided with a safety clamp.
The boiler is to be connected to a 230V-50Hz electrical power supply.
When connecting the boiler to power mains, follow correct phase / neutral polarity sequence.
Installation standards must be complied with and they are herein considered as entirely transcribed.
An easily accessible two-poled switch, with a minimum 3 mm distance between contacts, is to be installed ahead of the boiler. The switch is to
allow power supply cut-off in order to safely perform maintenance and service procedures.
Power supply to the boiler must be fitted with a residual-current circuit breaker having suitable disconnection capacity. Electric power supply must
be properly earthed.
The above mentioned safety measure must be verified. If in doubt, ask a qualified technician to thoroughly check the power network.
The manufacturer cannot be held responsible for any damage caused by failure to ground the system correctly: gas, water, or
CH system pipes are not suitable for grounding power networks.
Summary of Contents for ITACA KC 12
Page 71: ...71...
