HAMWORTHY HEATING LTD
60
Merley Boiler Sequence Controller
500001210/D
6.7 DHW
Setpoints
Line no.
Operating line
1610
Nominal setpoint
1612
reduced setpoint
The DHW can be heated up according to different setpoints. These setpoints are acti-
vated depending on the selected operating mode, thus leading to different temperature
levels in the DHW storage tank.
0
10
20
30
40
50
60
70
80
90
100
°C
23
58
Z
11
TWWR
TWWN
TWWmax
TWWR
DHW reduced setpoint
TWWN
DHW nominal setpoint
TWWmax
DHW nominal setpoint maximum
Priority
When both space heating and DHW heating call for heat, the
“
DHW priority
“
function
ensures that while DHW charging is in progress, the capacity of the boiler is used
primarily for DHW.
Absolute priority
The mixing and pump heating circuit stay locked until DHW heating is finished.
Shifting priority
If the capacity of the heat source is not sufficient, the mixing and pump heating circuit
will be restricted until DHW is heated up.
No priority
DHW heating and space heating take place at the same time.
In the case of tightly sized boilers and mixing heating circuits, it can happen that the
DHW setpoint will not be reached if space heating demands considerable amounts of
heat.
Mixing heating circuit shifting, pump heating circuit absolute
The pump heating circuits stay locked until the DHW storage tank is heated up. If the
capacity of the heat source is not sufficient, the mixing heating circuits will also be
restricted.
Line no.
Operating line
1630
Charging priority
Absolute
Shifting
None
MC shifting, PC absolute