HAMWORTHY HEATING LTD
69
Merley Boiler Sequence Controller
500001210/D
Frost protection for the plant
Line no.
Operating line
6120
Frost protection plant
The pumps are activated depending on the
current
outside temperature, even if there
is no heat request.
Outside temperature
Pump
Diagram
...
-
4 °C
Continuously on
ON
-
5…1.5
°C
On for 10 minutes at 6
-
hour intervals
Cycle (takt)
1.5 °C...
Continuously OFF
OFF
-2
23
71
Z
30
TA °C
OFF
0
1
2
3
4
-3
-4
-5
-6
-1
takt
ON
System pump Q14
The connected pump can be used as a system pump for supplying heat to other
consumers.
The system pump is put into operation as soon as one of consumers calls for heat. If
there is no demand for heat, the pump will be deactivated followed by overrun.
Cascade pump Q25
Common boiler pump for all boilers in a cascade.
DHW mixing pump Q35
Separate pump for storage tank circulation during the time the legionella function is
active.
Heat request K27
As soon as there is demand for heat, output K27 is activated.
Building and room model
Line no.
Operating line
6110
Time constant building
When the outside temperature varies, the room temperature changes at different
rates, depending on the building's thermal storage capacity.
The above setting is used to adjust the response of the flow temperature setpoint
when the outside temperature varies.
Example:
-
20 hours
The room temperature responds more slowly to outside temperature variations.
10
-
20 hours
This setting can be used for most types of buildings.
-
10 hours
The room temperature responds more quickly to outside temperature variations.
