
HAMWORTHY HEATING LTD
64
Merley Boiler Sequence Controller
500001210/D
Minimum limitation of the return temperature
Line no.
Operating line
3560
Return setpoint min
Return setpoint min
If the return temperature drops below the adjusted return setpoint, maintained boiler
return temperature becomes active..
Maintained boiler return temperature allows consumers to be influenced or a return
temperature controller to be used.
6.10 DHW storage tank
Charging control
Increase of the flow
temperature setpoint
Type of charging
The DHW request to the boiler is made up of the current DHW setpoint plus the
adjustable charging boost.
The storage tank can be charged using up to 2 sensors.
It is also possible to combine partial charging with 1 sensor and the legionella function
with 2 sensors (setting 3).
Electric immersion heater
Electric immersion heater
operating mode
Substitute
The electric immersion heater is only used if the boiler delivers a fault status message or
has been shut down via boiler lock. This means that in normal situations the DHW is
always heated by the boiler.
Summer
The electric immersion heater is used as soon as all connected heating circuits have
switched to summer operation. The DHW is again heated by the boiler as soon as at
least one of the heating circuits has switched back to heating operation. But the electric
immersion heater is also used if the boiler delivers a fault status message or has been
shut down via boiler lock.
Always
DHW is heated with the electric immersion heater throughout the year. This means that
when using this application, the boiler is never required for DHW heating.
Line no.
Operating line
5020
Flow setpoint boost
5022
Type of charging
With B3
With B3 & B31
With B3, legionella B3 & B31
Line no.
Operating line
5060
Immersion heater operating mode
Substitute
Summer
Always
5061
Immersion heater release
24/day
DHW release
Time program 4 / DHW
5062
Immersion heater control
External thermostat
2nd DHW sensor