16
Relay control
Two different temperatures are compared, e.g., the temperatures of the solar collector and ac-
cumulator. When the temperature difference is large enough, e.g., 10 °C, the solar collector’s
circulating pump is switched on. When the temperature difference drops to, e.g., 3 °C, the cir-
culating pump is switched off.
Relay control is switched on (ON) when the valve opens to the set setting. Relay control is
switched off when the valve position is at the OFF setting. The present actuator position and
relay mode can be seen from the controller’s display.
Select the energy mode according to H1 control valve’s control information.
Relay use
Explanation
Other controls -> Relay control
> Other controls > Relay control
Relay control Accord. to H1 valve position
Control mode Automatic>
Valve position where relay is active 95% >
Valve position where relay is released 90% >
H1 Valve position 85%
Relay control mode OFF
> Other controls > Relay control
Relay control Accord. to the temp. difference
Control mode Automatic>
Temp. of solar collector (A) 68.3°C >
Temperatur of accumulator (B) 55.4°C >
Temp. diff. (A-B) where relay is active 10 °C >
Temp.diff. (A-B) where relay is released 3 °C >
Relay control mode ON
Relay control according to the temperature difference:
Relay control according to the H1 Valve position:
Example: The water in the boiler is first warmed using inexpensive energy (e.g., air-to-water heat
pump) When EH-800 has almost completely opened the control valve (e.g., 95%) the relay is activa-
ted (ON) and the oil burner receives a running permit. When the heating need decreases the control-
ler starts closing the valve. The oil burner’s running permit is inactivated when the valve has closed
to the point at which the relay switches to the OFF mode (e.g., 90%).
0 %
100%
90% 95%
Valve position
Oil burner
running permit
Relay ON
Relay OFF
Other controls > Relay control
Relay control General alarm
Relay control mode OFF
When any of the alarms is activated in the device, also the sum/common alarm is activated.
The common alarm does not indicate, which alarm in the device is active. When any of the
alarms is unacknowledged, the relay is active.
An example: If EH-800 is installed in a separated room, the information of the controller`s alarm can
be transmitted to the accommodation by connecting e.g. an indicator lamp or a siren to the relay.
When the controller alarms, the indicator lamp or the siren indicates the alarm.
General alarm:
