30
3.2.11. Selecting the CH operating range
The setting range for the CH water temperature depends on the operating range selected.
- standard range: 20-78°C (from full anticlockwise to full clockwise position on knob 4);
- reduced range: 20-45°C (from full anticlockwise to full clockwise position on knob 4).
To select the operating range, turn the thermoregulation trimmer
(Fig. 19) as instructed below: - range standard: ruotare il trimmer
- standard range: turn the trimmer fully clockwise;
- reduced range: turn trimmer
fully anticlockwise.
Trimmer function
varies when an external probe is used (§ 3.2.14).
Selection of the operating range also affects the delay time between boiler ignition, the purpose of which is to prevent the boiler
switching on and off frequently when in CH mode.
- standard range: 4 minutes;
- reduced range: 2 minutes.
If the water temperature in the system falls below a set value (Table 8), the delay time is zeroed and the boiler re-ignites.
The operating range must be selected by the fitter or an Authorized Service Centre.
Operation range selection is to be implemented by a fitter or an authorized Service Centre.
3.2.12. Connecting the ambient thermostat (optional)
The boiler can be connected to an ambient thermostat (not supplied with the boiler).
The contacts must be properly sized in relation to a 5 mA 24 VDC load.
The wires must be connected to terminal
M9
on the electronic circuit board (Fig. 21), after removing the jumper supplied standard with
the boiler.
The ambient thermostat cables must NOT be sheathed together with the power cables.
3.2.13. Connecting the OpenTherm remote control (optional)
The boiler can be connected to a remote control (an optional supplied by the manufacturer).
It must be installed by a suitably qualified person.
Only original remote controls supplied by the manufacturer must be used.
If non-original remote controls are used, the manufacturer does not guarantee correct operation of the remote control
itself or the boiler.
For installation instructions, refer to the booklet accompanying the remote control.
Precautions to take when installing the remote control.
• The remote control cables must not be sheathed together with the power cables, otherwise the disturbance would cause the remote
control to malfunction.
• Position the remote control on a wall inside the building, about 1.5 metres from the ground, in a suitable position for measuring the
ambient temperature.
• Do not install in alcoves, behind doors or curtains, near sources of heat, or exposed to sunlight, draughts or spray.
The remote control connection is protected against false polarity, which means the connections can be switched.
Once the remote control has been installed, turn the boiler selector (2 in Fig. 1) to WINTER. .
CH and DHW functions can enabled and disabled from the remote control.
If the boiler selector is kept in a position other than WINTER, correct operation of the boiler and of the remote control are not
guaranteed.
Boiler selector on WINTER
Range selected
Ignition temperature
Standard range with set-point > 5°C
with set-point ≤55°C
<40°C
set-point T – Flow T >15°C
Reduced range regardless o the set-point
< 20°C
Table 8 – Burner ignition temperature Tabella 8 - Temperature di riaccensione del bruciatore
Summary of Contents for KR 55
Page 1: ...IST 03 C 000 01 INSTALLATION USE AND MAINTENANCE TAHITI CONDENSING KR 55 KR 85 GB...
Page 34: ...34 fig 21 A 3 5 Wiring diagram 55 KW...
Page 35: ...35 fig 21 B 85 KW...
Page 42: ...42...
Page 43: ...43...
