8 Operation
8.1 Use of the control panel
8.1.1 Control panel
The controls are operated by the control knobs and a reset button.
1
Display screen
2
Reset button
3
CH temperature control knob
4
Service diagnostic port
6
System water pressure gauge
Important
When an OpenTherm controller is connected adjustment of the
boiler, e.g. heating temperature, is made using the OpenTherm
controller rather than the boiler controls. The boiler controls are
overridden by the OpenTherm control. Please check the
functionality with the manufacturer of the OpenTherm controller.
8.2 Start up
If there is no power to the boiler, switch on at the fused spur unit and
ensure that the time control is in the on position and any other controls
(e.g. room thermostat) are calling for heat. The boiler will begin its start
sequence. This procedure performs a series of tests, after which the
installation is purged (this takes approximately five minutes).
8.3 Frost protection
Where possible, draining the system should be avoided. If the system is to
be unused during winter months several precautions must be taken:
Any parts of the system that are in unheated areas of the dwelling
should be fitted with a device such as a pipe thermostat or frost
thermostat.
Power must remain supplied to the boiler and controls.
Gas must remain supplied to the boiler.
The boiler pump will operate if the system temperature drops below 7°C. If
the temperature falls to 4°C the burner will ignite and remain lit until the
temperature reaches 10°C. At this temperature the burner will extinguish
but the pump will continue to operate for 15 minutes. This feature will
protect the boiler and to some extent adjacent parts of the system but
additional devices must be incorporated to guarantee frost protection.
Fig.42 Control panel
R
Reset
bar
0
1
2
3
4
1
2
3 4
5
PN-0000335
M
i
n
M
a
x
8 Operation
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