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HAMWORTHY HEATING LTD
52
Merley Boiler Sequence Controller
500001210/D
Error / alarm message
Input H1 generates a controller
-
internal error message.
If the
“
Alarm output
”
(relay outputs QX2
-
4, operating lines 5891 –
5894)
is
appropriately configured, the error message will be forwarded or displayed by an
additional contact (e.g. an external lamp or horn).
Minimum flow temperature setpoint TVHw
The adjusted minimum flow temperature setpoint will be activated via terminals H1/2
(e.g. an air heater function for a warm air curtain) closes its contact.
Excess heat discharge
Active dissipation of excessive heat enables an external heat source to force
consumers (heating circuit, DHW storage tank, Hx pump) to draw excessive heat by
delivering a forced signal.
The parameter
“
Excessive heat draw
“
can be used to determine for every consumer
whether or not it should take account of the "forced" signal, and hence whether or not
that consumer should participate in the dissipation of heat.
Local effect
When using LPB device address 0 or >1, excessive heat dissipation only acts on the
local consumers connected to the controller.
Central effect (LPB)
When using LPB device address = 1, excessive heat dissipation also acts on the
consumers connected to the other controllers in the same segment.
The distribution of excessive heat from segment 0 across other segments of the
system is not possible.
Heating demand 10V
Heat generation receives heat requests in the form of voltage signals (DC 0...10V).
The flow temperature setpoint corresponding to the voltage level of 10 V can be
adjusted via parameter
“
Temperature value 10V H
…“.
N/C contact
The contact is normally closed and must be opened to activate the selected function.
N/O contact
The contact is normally open and must be closed to activate the selected function.
Contact type, input H...
The function
“
Minimum flow setpoint
”
set on operating line 5950, 5960 or 6046 is
activated via contact H... The boiler is controlled constantly at the temperature level
set here either until contact H
…
opens again or until a higher heat request is
delivered.
Min flow temperature
setpoint H..
If several heat requests are received at the same time (LPB, contact H.. contact,
DHW, or from the controller itself), the highest of them will automatically be selected.
30
20
10
0
-10
40
30
60
50
80
70
TVw
TVw
23
55
Z
20
TA
°C
°C
gem
0
TVHw
TVHw
Minimum flow
temperature setpoint
TVw
Flow temperature
setpoint