HAMWORTHY HEATING LTD
76
Merley Boiler Sequence Controller
500001210/D
Chimney sweep
Line no.
Operating line
7130
Chimney sweep function
The burner will be switched on. To ensure continuous burner operation, the only switch
-
off point used is the boiler temperature's maximum limitation (TKmax).
First, all connected loads will be locked to ensure the boiler temperature will reach the
setpoint of 64 °C as quickly as possible.
When the minimum temperature of 64 °C is attained, the available heating circuits are
switched on one by one, using a dummy load, to make sure the heat generated by the
boiler is drawn off so that the burner will remain in operation.
For safety reasons, maximum limitation of the boiler temperature (TKmax) remains
active as long as the chimney sweep function is active.
The function is deactivated by setting
-
.
-
on this operating line, or automatically after a
timeout of 1 hour.
Name
relay
State
DHW
Charging pump
Q3
On
Diverting valve
Q3
Off
Mixing pump
Q32
Off
Intermediate circuit pump
Q33
On
Mixing valve opening / closing
Y31/Y32
Off
Circulating pump
Q4
On
Electric immersion heater
K6
On
Heating circuit 1.
2nd heating circuit pump
Q2
Q6
Q20
On
Heating circuit mixing valve opening / closing
Y1 / Y2
Y5 / Y6
Off
Heating circuit pump 2nd speed
Q21
Q22
Q23
On
Primary controller
System pump
Q14
On
Mixing valve opening / closing
Y19/Y20
Off
Hx group
Pump H1
Q15
On
Auxiliary functions
Alarm output
K10
Off
Heat demand
K27
On
Manual operation
Line no.
Operating line
7140
Manual control
When manual control is activated, the relay outputs are no longer energized and de
-
energized according to the control state but are set to a predefined manual control state
in accordance with their functions (see table below).
The burner relay energized in manual control can be de
-
energized by the electronic
temperature controller (TR).