HAMWORTHY HEATING LTD
27
Merley Boiler Sequence Controller
500001210/D
Exception
-
In exceptional cases, the basic display shows one of the following symbols:
A list of possible displays is given on pages 88/89
-
error code table
Reset function
The reset function for meters and the resettable parameters appears on the bottom line of the display, provided a
reset is permitted on the current operating line (end user / commissioning / heating engineer).
After activation with the OK button, the display will show a flashing
“
Yes
“.
After confirmation with the OK button, the relevant parameter or counter will be reset.
Manual operation
When manual operation is active, the relays are no longer energized and de
-
energized according to the control
state, but are set to a predefined manual operation state depending on their function.
The burner relay energized in manual control can be de
-
energized by the electronic temperature controller (TR).
Setpoint adjustment in manual control
After manual control has been activated, a change to the basic display must be made.
There, the maintenance / special mode symbol
appears.
Press the info button to switch to info display
“
Manual mode
“,
where the setpoint can be adjusted.
Chimney sweep function
The chimney sweep function is activated by a short press (maximum 3 seconds) on the chimney sweep button.
This function produces the operating state required to make emission measurements (flue gas).
SLT test
-
The SLT test (SLT = safety limit thermostat) is activated by a long press (longer than 3 seconds) on the
chimney sweep button. The button must be kept depressed during the entire test. If released, the test will be
aborted. The SLT test is shown on the display.
The test may only be made by qualified staff since the boiler temperature will be raised above the
maximum limits.
Error messages
If this symbol appears, an error in the
plant has occurred. Press the info but-
ton and read further information.
Text3
Text4
0
4
8
12
16
20
24
AUTO
2
3
5
9Z
14
0
30:Flow sensor 1
Error
Maintenance or special operation
If this symbol appears, a maintenance
alarm is delivered or the plant has
changed to special mode. Press the info
button and read further information.
Text3
Text4
0
4
8
12
16
20
24
AUTO
23
59
Z
14
0
30:Flow sensor 1
Error
0
4
8
12
16
20
24
2
3
5
9Z
14
0
Reset ?
yes
0
4
8
12
16
20
24
23
59
Z
14
0
Reset ?
yes