HAMWORTHY HEATING LTD
101
Merley Boiler Sequence Controller
500001210/D
APPENDIX C
-
Programming Parameters
Refer to Section 5.2 page 35, for itemisation of parameters covering the Merley functionality.
The folloing parameters will require setting to the appropriate or suggested values to enable the Merley control to
function. Any parameter not referred to should be left at the default setting.
1
General settings for all operations:
5930 input BX1
set to common flow sensor B10
5950 input H1
see individual control types below for best options for this
6117 central setpoint compensation
this is added to the Merley setpoint to give a boiler setpoint, default
is 20 but recommend reducing this in most cases. As a guide the Merley setpoint plus this parameter
setting should not be above the boilers max temp (default 85c)
6630 cascade master
set to always to ensure the controller is always seen as a multiple boiler sequencer
3540 Auto source sequencer changeover
default is 500hrs set to 170hrs for approx weekly lead boiler
shift
Outside sensor re
-
adjust
-
Parameter
6100
as required,
Building Time Constant
-
Parameter
6110
as required,
Heat required in Economy mode
-
Parameter
6131
set to ¦ on DHW ¦,
Save Sensors
-
Parameter
6200
set to ¦ yes ¦,
LPB check
Parameter
6600
check that the device address setting is 1
Parameter
6601
check that the segment address setting is 0
2
Time of day & date
-
Regardless of the use of the internal clock or external demand, it is a requirement
that the internal clock time of day & date are set as required
-
lines 1
-
6.
6640 clock mode
setting this to master then changing
604 on the boiler
from b0 0 to b0 1 allows the
Merley time to be given to the boiler.
This is good practice as if the boilers are ever powered down it automatically resets
the time and you don
’
t end up with it constantly flashing on the display
Internal Clock sensors required : common flow sensor and outside temperature sensor
5950 input H1
leave on the default
-
operating mode changeover HC
’
s+DHW
720 heating curve slope
a setting of 3 here will give 80c at 0c outside when the comfort setpoint is at its
default of 20.
730 summer/winter heating limit
switches off the heating when the outside temperature gets to this level,
function can be switched off (set to
---
) if required.
732 24
-
hour heating limit
this can turn off heating within normal operating hours and can also extend it
outside of normal operating hours which can result if problems especially if the Merley is not controlling the
pump run times. In general turn this function off ( set to
---
).
740/741 flow temp min/max
these two parameters set the range within which the slope will operate. For
fixed temp systems then set both these to the required fixed temp.
Remember on non
-
condensing boilers the min flow
temp setting should be set high enough to ensure that the boilers do NOT run in condensing temperature ranges.
750 room influence
default is 20% set to 0 on systems with no internal sensor. Otherwise the higher the
figure in here the more the heating will be influenced by the internal sensor instead of the external temp
compensation.
3
Radio
-
if a wireless application has been selected, ensure that all wireless compenents are switched on
prior to setting up the wirelss network
-
lines 120
-
140
4
Time Program Heating Circuit
-
set as required
-
lines 500
-
516
Note:
-
if an
External
time clock is to be used set parameters 501
-
506 to ¦ _ _ 0 ¦
5
Time Program DHW Circuit
-
set as required
-
lines 560
-
576
6
Holidays Heating Circuit
-
set as required
-
lines 641
-
648
7
External enable fixed temp sensors required: common flow sensor and outside temperature sensor
(optional)